Do you need to know, when is the best time to go to Wales? Then you should take a look here, what weather you can expect there during the year.
Wales is part of United Kingdom. The climate of United Kingdom is temperate, weather is moderated by prevailing southwest winds over the North Atlantic Current. More than one-half of the days are overcast. Weather is usually quite unstable here. Generally speaking, you can expect cool and often cloudy weather. You can also expect warmer weather in the southern part of UK.
When speaking about the usual weather in this area, the information is relevant for example for these popular places: Aberaeron, Abercastle, Aberdare, Aberdaron, Aberdyfi, Abereiddy, Aberffraw, Abergavenny, Abergele, Aberporth, Abersoch, Aberystwyth, Afan Forest Park, Amlwch, Ammanford, Amroth, Anglesey, Bala, Bangor, Bardsey Island, Barmouth, Barry, Beaumaris, Beddgelert, Benllech, Bethesda, Betws y Coed, Blaenau Ffestiniog, Blaenavon, Borth, Brecon, Brecon Beacons National Park, Bridgend, Broad Haven, Brynmawr, Brynsiencyn, Builth Wells, Burry Port, Caernarfon, Caerphilly, Caldicot, Capel Curig, Cardiff, Cardigan, Carmarthen, Carmarthenshire, Ceredigion, Cerrigydrudion, Chepstow, Chirk, Church Bay, Clwyd, Colwyn Bay, Conwy, Corris, Corwen, Cowbridge, Criccieth, Crickhowell, Cwmbran, Deeside, Denbigh, Devil's Bridge, Dinas Dinlle, Dinas Mawddwy, Dolgellau, Ebbw Vale, Fairbourne, Ferryside, Fishguard, Flint, Freshwater East, Glamorgan, Gower Peninsula, Gwynedd, Harlech, Haverfordwest, Hay on Wye, Herbrandston, Holt, Holyhead, Holywell, Kidwelly, Knighton, Lampeter, Laugharne, Lawrenny, Llanberis, Llanddona, Llandeilo, Llandovery, Llandrindod Wells, Llandudno, Llandudno Junction, Llandysul, Llanelli, Llanfaethlu, Llanfair Caereinion, Llanfairfechan, Llanfairpwllgwyngyll, Llanfyllin, Llangefni, Llangollen, Llangrannog, Llanidloes, Llanrwst, Llansteffan, Llantrisant, Llantwit Major, Llanwrtyd Wells, Llŷn, Machynlleth, Manorbier, Menai Bridge, Merthyr Tydfil, Mid Wales, Milford Haven, Moelfre, Mold, Monmouth, Monmouthshire, Montgomery, Narberth, Neath, Nefyn, New Quay, Newborough, Newcastle Emlyn, Newgale, Newport, Newtown, North Wales, Pembroke, Pembrokeshire, Pembrokeshire Coast National Park, Pen y Cae, Penarth, Pendine, Penmaenpool, Penmon, Pontardawe, Ponterwyd, Pontrhydfendigaid, Pontypool, Pontypridd, Port Talbot, Porthcawl, Porthgain, Porthmadog, Portmeirion, Powys, Prestatyn, Presteigne, Pwllheli, Raglan, Red Wharf Bay, Rhayader, Rhoose, Rhoscolyn, Rhosneigr, Rhuddlan, Rhyd Ddu, Rhyl, Ruthin, Saundersfoot, Skomer, Snowdonia National Park, Solva, South Stack, South Wales, Southerndown, St. Clears, St Asaph, St Davids, Sully, Swansea, Tenby, Tintern, Trearddur Bay, Trecastle, Tredegar, Trefriw, Tywyn, Usk, Valley, Welshpool, Wrexham.
Let's look now what weather you can expect in the area around Cardiff and in many other cities. The warmest month here is July, the average maximum temperature is 21.4 ℃ (70.52 ℉). The average minimum temperature in this month is 13.4 ℃ (56.12 ℉). The coldest month here is January, the average maximum temperature is 8.3 ℃ (46.94 ℉). The average minimum temperature in this month is 2.5 ℃ (36.5 ℉). The most rainy month here is January, the average number of rainy days is 15.8. The least rainy month here is June, the average number of rainy days is 10. 
When travelling around Wales, always consider the altitude of the the place as well. We should remind you, that the highest point in United Kingdom is Ben Nevis (1343 m) and the lowest point is The Fens (-4 m). So the differences in altitudes in this country are not negligible and you should expect the weather to be different in places in different altitudes. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Wales in January is this: The average highest temperature in Wales in January is 8.3 ℃ (46.94 ℉). The average lowest temperature is 2.5 ℃ (36.5 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 8.6 ℃ (47.48 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 8.6 ℃ (47.48 ℉). The average number of rainy days in January is 15.8. The average rainfall is 123.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 7:55 (hours and minutes), in the middle of the month 8:21 and at the end of the month 9:04.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in February is this: The average highest temperature in Wales in February is 8.9 ℃ (48.02 ℉). The average lowest temperature is 2.3 ℃ (36.14 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 8.6 ℃ (47.48 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 10.15 ℃ (50.27 ℉). The average number of rainy days in February is 11.3. The average rainfall is 87.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:04 (hours and minutes), in the middle of the month 9:57 and at the end of the month 10:54.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in March is this: The average highest temperature in Wales in March is 11.4 ℃ (52.52 ℉). The average lowest temperature is 4.3 ℃ (39.74 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 10.15 ℃ (50.27 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 12.55 ℃ (54.59 ℉). The average number of rainy days in March is 13. The average rainfall is 91.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:54 (hours and minutes), in the middle of the month 11:54 and at the end of the month 12:53.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in April is this: The average highest temperature in Wales in April is 13.7 ℃ (56.66 ℉). The average lowest temperature is 5.3 ℃ (41.54 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 12.55 ℃ (54.59 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 15.55 ℃ (59.99 ℉). The average number of rainy days in April is 11. The average rainfall is 69.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:53 (hours and minutes), in the middle of the month 13:51 and at the end of the month 14:46.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Wales in May is this: The average highest temperature in Wales in May is 17.4 ℃ (63.32 ℉). The average lowest temperature is 8.4 ℃ (47.12 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 15.55 ℃ (59.99 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 18.75 ℃ (65.75 ℉). The average number of rainy days in May is 11.2. The average rainfall is 70.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 14:46 (hours and minutes), in the middle of the month 15:35 and at the end of the month 16:14.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in June is this: The average highest temperature in Wales in June is 20.1 ℃ (68.18 ℉). The average lowest temperature is 11.2 ℃ (52.16 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 18.75 ℃ (65.75 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 20.75 ℃ (69.35 ℉). The average number of rainy days in June is 10. The average rainfall is 66.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 16:14 (hours and minutes), in the middle of the month 16:34 and at the end of the month 16:34.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in July is this: The average highest temperature in Wales in July is 21.4 ℃ (70.52 ℉). The average lowest temperature is 13.4 ℃ (56.12 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 20.75 ℃ (69.35 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). The average number of rainy days in July is 11. The average rainfall is 79.8 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 16:34 (hours and minutes), in the middle of the month 16:12 and at the end of the month 15:33.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in August is this: The average highest temperature in Wales in August is 21.3 ℃ (70.34 ℉). The average lowest temperature is 13.1 ℃ (55.58 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 21.35 ℃ (70.43 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 20.35 ℃ (68.63 ℉). The average number of rainy days in August is 10.8. The average rainfall is 92.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 15:33 (hours and minutes), in the middle of the month 14:44 and at the end of the month 13:49.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in September is this: The average highest temperature in Wales in September is 19.4 ℃ (66.92 ℉). The average lowest temperature is 10.5 ℃ (50.9 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 20.35 ℃ (68.63 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 17.35 ℃ (63.23 ℉). The average number of rainy days in September is 11.3. The average rainfall is 94.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:49 (hours and minutes), in the middle of the month 12:52 and at the end of the month 11:53.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in October is this: The average highest temperature in Wales in October is 15.3 ℃ (59.54 ℉). The average lowest temperature is 7.9 ℃ (46.22 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 17.35 ℃ (63.23 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 13.45 ℃ (56.21 ℉). The average number of rainy days in October is 15.5. The average rainfall is 130.6 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:53 (hours and minutes), in the middle of the month 10:55 and at the end of the month 9:58.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in November is this: The average highest temperature in Wales in November is 11.6 ℃ (52.88 ℉). The average lowest temperature is 4.8 ℃ (40.64 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 13.45 ℃ (56.21 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 10.25 ℃ (50.45 ℉). The average number of rainy days in November is 14.9. The average rainfall is 121.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 9:58 (hours and minutes), in the middle of the month 9:06 and at the end of the month 8:23.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Wales in December is this: The average highest temperature in Wales in December is 8.9 ℃ (48.02 ℉). The average lowest temperature is 2.8 ℃ (37.04 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 10.25 ℃ (50.45 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 8.6 ℃ (47.48 ℉). The average number of rainy days in December is 13.7. The average rainfall is 127.3 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 8:23 (hours and minutes), in the middle of the month 7:56 and at the end of the month 7:51.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.| Cardiff | temperature: - | highest temperature: 8.9 ℃ (48.02 ℉) | lowest temperature: 2.8 ℃ (37.04 ℉) | rainfall: 127.3mm | rainy days: 13.7 |
| Aberystwyth | temperature: - | highest temperature: 8.8 ℃ (47.84 ℉) | lowest temperature: 2.7 ℃ (36.86 ℉) | rainfall: 117.4mm | rainy days: 15.2 |
| Bala | temperature: - | highest temperature: 7.6 ℃ (45.68 ℉) | lowest temperature: 1.2 ℃ (34.16 ℉) | rainfall: 162.6mm | rainy days: 17 |
| Rhayader | temperature: - | highest temperature: 7 ℃ (44.6 ℉) | lowest temperature: 1.4 ℃ (34.52 ℉) | rainfall: 125.4mm | rainy days: 15.6 |
| Swansea | temperature: - | highest temperature: 8.9 ℃ (48.02 ℉) | lowest temperature: 4.8 ℃ (40.64 ℉) | rainfall: 108mm | rainy days: 14.6 |