Do you need to know, when is the best time to go to Tunisia? Then you should take a look here, what weather you can expect there during the year.
The climate of Tunisia is Mediterranean, temperate in north, you can expect mild and quite rainy winters there, but hot and dry summers. In the south the climate is climate is hotter, drier and sunnier, there is desert.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Bizerte, Carthage, Central Coastal Tunisia, Djerba, Dougga, Douz, El Jem, El Kef, Gabes, Gafsa, Hammamet, Jebil National Park, Kairouan, Kef, Kelibia, Kerkouane, Ksar Ghilane, La Goulette, La Marsa, Mahdia, Matmata, Medenine, Metlaoui, Monastir, Nefta, Northern Tunisia, Port El Kantaoui, Saharan Tunisia, Sfax, Sidi Bou Said, Sousse, Sufetula, Tabarka, Tataouine, Tozeur, Tunis.
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 33.6 ℃ (92.48 ℉). The average minimum temperature in this month is 20 ℃ (68 ℉). The coldest month here is January, the average maximum temperature is 16 ℃ (60.8 ℉). The average minimum temperature in this month is 7.5 ℃ (45.5 ℉). 
When travelling to some places in Tunisia, always consider the altitude of the the place as well. The highest point here is Jebel ech Chambi (1544 m) and the lowest point is Shatt al Gharsah (-17 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 Tunisia in January is this: The average highest temperature in Tunisia in January is 16 ℃ (60.8 ℉). The average lowest temperature is 7.5 ℃ (45.5 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 16.65 ℃ (61.97 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 16.35 ℃ (61.43 ℉). The average rainfall is 59.1 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 9:40 (hours and minutes), in the middle of the month 9:54 and at the end of the month 10:18.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 Tunisia in February is this: The average highest temperature in Tunisia in February is 16.7 ℃ (62.06 ℉). The average lowest temperature is 7.7 ℃ (45.86 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 16.35 ℃ (61.43 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 17.55 ℃ (63.59 ℉). The average rainfall is 57.4 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 10:18 (hours and minutes), in the middle of the month 10:49 and at the end of the month 11:23.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 Tunisia in March is this: The average highest temperature in Tunisia in March is 18.4 ℃ (65.12 ℉). The average lowest temperature is 8.6 ℃ (47.48 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 17.55 ℃ (63.59 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 19.7 ℃ (67.46 ℉). The average rainfall is 46.3 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 11:23 (hours and minutes), in the middle of the month 11:58 and at the end of the month 12:33.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 Tunisia in April is this: The average highest temperature in Tunisia in April is 21 ℃ (69.8 ℉). The average lowest temperature is 10.5 ℃ (50.9 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 19.7 ℃ (67.46 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). The average rainfall is 38 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 12:33 (hours and minutes), in the middle of the month 13:08 and at the end of the month 13:40.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 Tunisia in May is this: The average highest temperature in Tunisia in May is 25.6 ℃ (78.08 ℉). The average lowest temperature is 13.7 ℃ (56.66 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 27.2 ℃ (80.96 ℉). The average rainfall is 22.4 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 13:40 (hours and minutes), in the middle of the month 14:08 and at the end of the month 14:28.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, especially in mountains.
Typical (usual) weather in Tunisia in June is this: The average highest temperature in Tunisia in June is 28.8 ℃ (83.84 ℉). The average lowest temperature is 17.9 ℃ (64.22 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 27.2 ℃ (80.96 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 31.2 ℃ (88.16 ℉). The average rainfall is 10.2 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 14:28 (hours and minutes), in the middle of the month 14:40 and at the end of the month 14:39.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 Tunisia in July is this: The average highest temperature in Tunisia in July is 33.6 ℃ (92.48 ℉). The average lowest temperature is 20 ℃ (68 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 31.2 ℃ (88.16 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 32.85 ℃ (91.13 ℉). The average rainfall is 3.1 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 14:39 (hours and minutes), in the middle of the month 14:27 and at the end of the month 14:06.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 Tunisia in August is this: The average highest temperature in Tunisia in August is 32.1 ℃ (89.78 ℉). The average lowest temperature is 21.3 ℃ (70.34 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 32.85 ℃ (91.13 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 30.85 ℃ (87.53 ℉). The average rainfall is 6.9 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 14:06 (hours and minutes), in the middle of the month 13:38 and at the end of the month 13:07.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 Tunisia in September is this: The average highest temperature in Tunisia in September is 29.6 ℃ (85.28 ℉). The average lowest temperature is 19.2 ℃ (66.56 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 30.85 ℃ (87.53 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 27.75 ℃ (81.95 ℉). The average rainfall is 33.3 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 13:07 (hours and minutes), in the middle of the month 12:33 and at the end of the month 11:58.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 Tunisia in October is this: The average highest temperature in Tunisia in October is 25.9 ℃ (78.62 ℉). The average lowest temperature is 15.7 ℃ (60.26 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 27.75 ℃ (81.95 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). The average rainfall is 66 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 11:58 (hours and minutes), in the middle of the month 11:23 and at the end of the month 10:50.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 Tunisia in November is this: The average highest temperature in Tunisia in November is 20.7 ℃ (69.26 ℉). The average lowest temperature is 11.2 ℃ (52.16 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 23.3 ℃ (73.94 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 19 ℃ (66.2 ℉). The average rainfall is 55.2 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 10:50 (hours and minutes), in the middle of the month 10:19 and at the end of the month 9:55.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 Tunisia in December is this: The average highest temperature in Tunisia in December is 17.3 ℃ (63.14 ℉). The average lowest temperature is 8.4 ℃ (47.12 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 19 ℃ (66.2 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 16.65 ℃ (61.97 ℉). The average rainfall is 68 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 9:55 (hours and minutes), in the middle of the month 9:41 and at the end of the month 9:38.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.| Tunis | temperature: 12.8 ℃ (55.04 ℉) | highest temperature: 17.4 ℃ (63.32 ℉) | lowest temperature: 8.8 ℃ (47.84 ℉) | rainfall: 67.2mm | rainy days: - |
| Jendouba | temperature: 11.5 ℃ (52.7 ℉) | highest temperature: 16.9 ℃ (62.42 ℉) | lowest temperature: 6.5 ℃ (43.7 ℉) | rainfall: 58.1mm | rainy days: - |
| Kairouan | temperature: 12.8 ℃ (55.04 ℉) | highest temperature: 18.8 ℃ (65.84 ℉) | lowest temperature: 7.7 ℃ (45.86 ℉) | rainfall: 36.1mm | rainy days: - |
| Gafsa | temperature: 10.7 ℃ (51.26 ℉) | highest temperature: 16.1 ℃ (60.98 ℉) | lowest temperature: 5.4 ℃ (41.72 ℉) | rainfall: 27mm | rainy days: - |
| Sfax El Maou | temperature: 12.7 ℃ (54.86 ℉) | highest temperature: 18 ℃ (64.4 ℉) | lowest temperature: 7.3 ℃ (45.14 ℉) | rainfall: 29.1mm | rainy days: - |
| Gabes | temperature: 13.7 ℃ (56.66 ℉) | highest temperature: 18.4 ℃ (65.12 ℉) | lowest temperature: 8.9 ℃ (48.02 ℉) | rainfall: 33.2mm | rainy days: - |
| Djerba Mellita | temperature: 14.2 ℃ (57.56 ℉) | highest temperature: 18 ℃ (64.4 ℉) | lowest temperature: 11 ℃ (51.8 ℉) | rainfall: 35.5mm | rainy days: - |