Do you need to know, when is the best time to go to Belgium? Then you should take a look here, what weather you can expect there during the year.
The climate of Belgium is maritime temperate, you can expect mild winters and quite cool summers. The weather is often rainy, humid or cloudy. There is significant precipitation in all seasons, but if you are lucky, you can enjoy hot sunny weather in summer.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Aalst, Aarschot, Antwerp, Arlon, Ath, Bastogne, Berlare, Beveren, Binche, Bouillon, Bruges, Brussels, Cambron Casteau, Charleroi, Chimay, Chièvres, Damme, De Haan, Deinze, Dendermonde, Diest, Dinant, East Flanders, Eupen, Flanders, Flemish Brabant, Geraardsbergen, Ghent, Grimbergen, Hainaut, Halen, Hasselt, Henri Chapelle, Hermalle sous Huy, Keerbergen, Kelmis, Knokke Heist, Koksijde, Kortrijk, Kraainem, La Louvière, Leuven, Lier, Limburg, Liège, Lochristi, Lokeren, Louvain la Neuve, Luxembourg, Maasmechelen, Mechelen, Mons, Namur, Neerijse, Neupré, Nieuwpoort, Ostend, Oudenaarde, Poperinge, Pottes, Roeselare, Sint Martens Latem, Sint Niklaas, Sint Pieters Leeuw, Sint Truiden, Spa, Spiennes, Tervuren, Thuin, Tongeren, Tournai, Turnhout, Verviers, Villers la Ville, Vilvoorde, Waasmunster, Wallonia, Walloon Brabant, Waterloo, West Flanders, Ypres, Zuid Dijleland.
Let's look now what weather you can expect in the area around the capital and in many other cities. The warmest month here is July, the average maximum temperature is 23.1 ℃ (73.58 ℉). The average minimum temperature in this month is 13.7 ℃ (56.66 ℉). The coldest month here is January, the average maximum temperature is 5.8 ℃ (42.44 ℉). The average minimum temperature in this month is 0.9 ℃ (33.62 ℉). The most rainy month here is December, the average number of rainy days is 13.1. The least rainy month here is August, the average number of rainy days is 8.9. 
When travelling to some places in Belgium, always consider the altitude of the the place as well. The highest point here is Botrange (694 m) and the lowest point is North Sea (0 m). So there are not big differences in altitudes in this country. But the altitude affects the weather even so. 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 Belgium in January is this: The average highest temperature in Belgium in January is 5.8 ℃ (42.44 ℉). The average lowest temperature is 0.9 ℃ (33.62 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 6.25 ℃ (43.25 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 6.15 ℃ (43.07 ℉). The average number of rainy days in January is 12.9. The average rainfall is 73 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 8:01 (hours and minutes), in the middle of the month 8:26 and at the end of the month 9:08.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.Typical (usual) weather in Belgium in February is this: The average highest temperature in Belgium in February is 6.5 ℃ (43.7 ℉). The average lowest temperature is 0.8 ℃ (33.44 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 6.15 ℃ (43.07 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 8.4 ℃ (47.12 ℉). The average number of rainy days in February is 10. The average rainfall is 53 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 9:08 (hours and minutes), in the middle of the month 10:00 and at the end of the month 10:56.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.Typical (usual) weather in Belgium in March is this: The average highest temperature in Belgium in March is 10.3 ℃ (50.54 ℉). The average lowest temperature is 3.2 ℃ (37.76 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 8.4 ℃ (47.12 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 11.75 ℃ (53.15 ℉). The average number of rainy days in March is 13. The average rainfall is 72 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 10:56 (hours and minutes), in the middle of the month 11:54 and at the end of the month 12:52.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.Typical (usual) weather in Belgium in April is this: The average highest temperature in Belgium in April is 13.2 ℃ (55.76 ℉). The average lowest temperature is 5 ℃ (41 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 11.75 ℃ (53.15 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 15.65 ℃ (60.17 ℉). The average number of rainy days in April is 10.6. The average rainfall is 54.2 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 12:52 (hours and minutes), in the middle of the month 13:49 and at the end of the month 14:43.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.
Typical (usual) weather in Belgium in May is this: The average highest temperature in Belgium in May is 18.1 ℃ (64.58 ℉). The average lowest temperature is 9.2 ℃ (48.56 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 15.65 ℃ (60.17 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 18.95 ℃ (66.11 ℉). The average number of rainy days in May is 11.5. The average rainfall is 69.3 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 14:43 (hours and minutes), in the middle of the month 15:31 and at the end of the month 16:08.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.Typical (usual) weather in Belgium in June is this: The average highest temperature in Belgium in June is 19.8 ℃ (67.64 ℉). The average lowest temperature is 11.8 ℃ (53.24 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 18.95 ℃ (66.11 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 21.45 ℃ (70.61 ℉). The average number of rainy days in June is 11.1. The average rainfall is 75.8 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 16:08 (hours and minutes), in the middle of the month 16:28 and at the end of the month 16:27.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.
Typical (usual) weather in Belgium in July is this: The average highest temperature in Belgium in July is 23.1 ℃ (73.58 ℉). The average lowest temperature is 13.7 ℃ (56.66 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 21.45 ℃ (70.61 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 23.05 ℃ (73.49 ℉). The average number of rainy days in July is 9.5. The average rainfall is 69.4 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 16:27 (hours and minutes), in the middle of the month 16:06 and at the end of the month 15:28.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.Typical (usual) weather in Belgium in August is this: The average highest temperature in Belgium in August is 23 ℃ (73.4 ℉). The average lowest temperature is 13.5 ℃ (56.3 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 23.05 ℃ (73.49 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 21.05 ℃ (69.89 ℉). The average number of rainy days in August is 8.9. The average rainfall is 65.2 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 15:28 (hours and minutes), in the middle of the month 14:40 and at the end of the month 13:47.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.Typical (usual) weather in Belgium in September is this: The average highest temperature in Belgium in September is 19.1 ℃ (66.38 ℉). The average lowest temperature is 11.1 ℃ (51.98 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 21.05 ℃ (69.89 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 17 ℃ (62.6 ℉). The average number of rainy days in September is 10.1. The average rainfall is 64.4 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 13:47 (hours and minutes), in the middle of the month 12:51 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.Typical (usual) weather in Belgium in October is this: The average highest temperature in Belgium in October is 14.9 ℃ (58.82 ℉). The average lowest temperature is 8 ℃ (46.4 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 17 ℃ (62.6 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 12.1 ℃ (53.78 ℉). The average number of rainy days in October is 10.5. The average rainfall is 68.1 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 11:53 (hours and minutes), in the middle of the month 10:56 and at the end of the month 10:01.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.Typical (usual) weather in Belgium in November is this: The average highest temperature in Belgium in November is 9.3 ℃ (48.74 ℉). The average lowest temperature is 3.8 ℃ (38.84 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 12.1 ℃ (53.78 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 8 ℃ (46.4 ℉). The average number of rainy days in November is 12.6. The average rainfall is 80.1 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 10:01 (hours and minutes), in the middle of the month 9:10 and at the end of the month 8:28.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.Typical (usual) weather in Belgium in December is this: The average highest temperature in Belgium in December is 6.7 ℃ (44.06 ℉). The average lowest temperature is 2.1 ℃ (35.78 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 8 ℃ (46.4 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 6.25 ℃ (43.25 ℉). The average number of rainy days in December is 13.1. The average rainfall is 78.5 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 8:28 (hours and minutes), in the middle of the month 8:02 and at the end of the month 7:57.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.| Brussels | temperature: - | highest temperature: 6.7 ℃ (44.06 ℉) | lowest temperature: 2.1 ℃ (35.78 ℉) | rainfall: 78.5mm | rainy days: 13.1 |
| Ostend | temperature: - | highest temperature: 7.4 ℃ (45.32 ℉) | lowest temperature: 2.4 ℃ (36.32 ℉) | rainfall: 73.8mm | rainy days: 12.6 |
| Kleine Brogel | temperature: - | highest temperature: 6.7 ℃ (44.06 ℉) | lowest temperature: 1 ℃ (33.8 ℉) | rainfall: 79.6mm | rainy days: 13.7 |
| St. Hubert | temperature: - | highest temperature: 3.5 ℃ (38.3 ℉) | lowest temperature: -0.7 ℃ (30.74 ℉) | rainfall: 110.1mm | rainy days: 15.2 |
| Virton | temperature: - | highest temperature: 5.5 ℃ (41.9 ℉) | lowest temperature: 0.5 ℃ (32.9 ℉) | rainfall: 120.8mm | rainy days: 14.7 |