Do you need to know, when is the best time to go to Congo, Republic? Then you should take a look here, what weather you can expect there during the year.
The climate of Congo, Republic, is tropical, hot and humid. Rainy season is from March to June, dry season is from June to October. You can expect persistent high temperatures and humidity, but the weather is usually cool and dry in the southern highlands, and cold in the Rwenzori Mountains.
When speaking about the usual weather in this state, the information is relevant for example for these popular places: Brazzaville, Coast and Mayombe, Congolese Plateau, Cuvette, Dolisie, Ile Mbamou, Lesio Louna Gorilla Reserve, Mossendjo, Niari Valley, Nouabalé Ndoki National Park, Owando, Pointe Noire, Pool, Sangha and Likouala.
Let's look now what weather you can expect here. (Warning: As we don't have reliable data for this country, we use data from nearby locations for these statistics.) The warmest month here is March, the average maximum temperature is 30.2 ℃ (86.36 ℉). The average minimum temperature in this month is 21.2 ℃ (70.16 ℉). The coldest month here is August, the average maximum temperature is 26.9 ℃ (80.42 ℉). The average minimum temperature in this month is 19.7 ℃ (67.46 ℉). 
When travelling to some places in Congo, Republic, always consider the altitude of the the place as well. The highest point here is Mount Berongou (903 m) and the lowest point is Atlantic Ocean (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 Congo, Republic in January is this: The average highest temperature in Congo, Republic in January is 28.6 ℃ (83.48 ℉). The average lowest temperature is 20.4 ℃ (68.72 ℉). At the beginning of January you can expect lower temperatures, the average highest temperature is around 28.5 ℃ (83.3 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 29.1 ℃ (84.38 ℉). The average rainfall is 163.6 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 12:12 (hours and minutes), in the middle of the month 12:11 and at the end of the month 12:10.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in February is this: The average highest temperature in Congo, Republic in February is 29.6 ℃ (85.28 ℉). The average lowest temperature is 21.2 ℃ (70.16 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 29.1 ℃ (84.38 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 29.9 ℃ (85.82 ℉). The average rainfall is 197.8 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 12:10 (hours and minutes), in the middle of the month 12:09 and at the end of the month 12:08.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in March is this: The average highest temperature in Congo, Republic in March is 30.2 ℃ (86.36 ℉). The average lowest temperature is 21.2 ℃ (70.16 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 29.9 ℃ (85.82 ℉). At the end of March you can expect lower temperatures, the average highest temperature is around 30.05 ℃ (86.09 ℉). The average rainfall is 276.3 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 12:08 (hours and minutes), in the middle of the month 12:07 and at the end of the month 12:05.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in April is this: The average highest temperature in Congo, Republic in April is 29.9 ℃ (85.82 ℉). The average lowest temperature is 21.2 ℃ (70.16 ℉). At the beginning of April you can expect higher temperatures, the average highest temperature is around 30.05 ℃ (86.09 ℉). At the end of April you can expect lower temperatures, the average highest temperature is around 29.65 ℃ (85.37 ℉). The average rainfall is 215.1 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 12:05 (hours and minutes), in the middle of the month 12:04 and at the end of the month 12:03.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in May is this: The average highest temperature in Congo, Republic in May is 29.4 ℃ (84.92 ℉). The average lowest temperature is 20.4 ℃ (68.72 ℉). At the beginning of May you can expect higher temperatures, the average highest temperature is around 29.65 ℃ (85.37 ℉). At the end of May you can expect lower temperatures, the average highest temperature is around 28.55 ℃ (83.39 ℉). The average rainfall is 212 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 12:03 (hours and minutes), in the middle of the month 12:02 and at the end of the month 12:02.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.
Typical (usual) weather in Congo, Republic in June is this: The average highest temperature in Congo, Republic in June is 27.7 ℃ (81.86 ℉). The average lowest temperature is 19.4 ℃ (66.92 ℉). At the beginning of June you can expect higher temperatures, the average highest temperature is around 28.55 ℃ (83.39 ℉). At the end of June you can expect lower temperatures, the average highest temperature is around 27.45 ℃ (81.41 ℉). The average rainfall is 40 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 12:02 (hours and minutes), in the middle of the month 12:01 and at the end of the month 12:01.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in July is this: The average highest temperature in Congo, Republic in July is 27.2 ℃ (80.96 ℉). The average lowest temperature is 19.2 ℃ (66.56 ℉). At the beginning of July you can expect higher temperatures, the average highest temperature is around 27.45 ℃ (81.41 ℉). At the end of July you can expect lower temperatures, the average highest temperature is around 27.05 ℃ (80.69 ℉). The average rainfall is 13.3 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 12:01 (hours and minutes), in the middle of the month 12:02 and at the end of the month 12:02.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in August is this: The average highest temperature in Congo, Republic in August is 26.9 ℃ (80.42 ℉). The average lowest temperature is 19.7 ℃ (67.46 ℉). At the beginning of August you can expect higher temperatures, the average highest temperature is around 27.05 ℃ (80.69 ℉). At the end of August you can expect higher temperatures, the average highest temperature is around 27.75 ℃ (81.95 ℉). The average rainfall is 19.7 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 12:02 (hours and minutes), in the middle of the month 12:03 and at the end of the month 12:04.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in September is this: The average highest temperature in Congo, Republic in September is 28.6 ℃ (83.48 ℉). The average lowest temperature is 19.9 ℃ (67.82 ℉). At the beginning of September you can expect lower temperatures, the average highest temperature is around 27.75 ℃ (81.95 ℉). At the end of September you can expect higher temperatures, the average highest temperature is around 28.7 ℃ (83.66 ℉). The average rainfall is 123.9 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 12:04 (hours and minutes), in the middle of the month 12:05 and at the end of the month 12:07.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in October is this: The average highest temperature in Congo, Republic in October is 28.8 ℃ (83.84 ℉). The average lowest temperature is 20.7 ℃ (69.26 ℉). At the beginning of October you can expect lower temperatures, the average highest temperature is around 28.7 ℃ (83.66 ℉). At the end of October you can expect higher temperatures, the average highest temperature is around 29.1 ℃ (84.38 ℉). The average rainfall is 260.4 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 12:07 (hours and minutes), in the middle of the month 12:08 and at the end of the month 12:09.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in November is this: The average highest temperature in Congo, Republic in November is 29.4 ℃ (84.92 ℉). The average lowest temperature is 20.7 ℃ (69.26 ℉). At the beginning of November you can expect lower temperatures, the average highest temperature is around 29.1 ℃ (84.38 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 28.9 ℃ (84.02 ℉). The average rainfall is 278.4 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 12:09 (hours and minutes), in the middle of the month 12:10 and at the end of the month 12:11.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.Typical (usual) weather in Congo, Republic in December is this: The average highest temperature in Congo, Republic in December is 28.4 ℃ (83.12 ℉). The average lowest temperature is 20.4 ℃ (68.72 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 28.9 ℃ (84.02 ℉). At the end of December you can expect higher temperatures, the average highest temperature is around 28.5 ℃ (83.3 ℉). The average rainfall is 188.3 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 12:11 (hours and minutes), in the middle of the month 12:12 and at the end of the month 12:12.This data is approximate because we do not have exact data for this country. It is important to say, that the weather may differ significantly in different altitudes.