May weather forecast and climate
Cotonou, Benin

May, the last month of the spring, in Cotonou, is another tropical month, with average temperature fluctuating between 24.6°C (76.3°F) and 31°C (87.8°F).

Temperature

In Cotonou, the average high-temperature is relatively the same as in April - a still hot 31°C (87.8°F). In Cotonou, Benin, in May, the average low-temperature is 24.6°C (76.3°F).

Heat index

The average heat index in May is appraised at a blistering 40.9°C (105.6°F). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'real feel', or 'feels like', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like wind, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
The human body normally cools itself by perspiration. Excessive warmth is eliminated from the body by evaporation of sweat. With a lot of moisture in the air, the evaporation process is not as effective, and the body does not cool down as efficiently, creating a perception of overheating. If the body can not disperse the excessive heat and body temperature reaches conditions of hyperthermia, above 37.5°C (99.5°F) to 38.3°C (100.9°F), thermal conditions are potentially life-threatening.

Humidity

In Cotonou, the average relative humidity is 80%.

Rainfall

In Cotonou, during May, the rain falls for 11 days and regularly aggregates up to 196.9mm (7.75") of precipitation. In Cotonou, during the entire year, the rain falls for 75 days and collects up to 1308.3mm (51.51") of precipitation.

Sea temperature

March through May and November, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Cotonou.
Note: For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

The average length of the day in Cotonou, Benin, is 12.4h.

Sunshine

In May, the average sunshine is 6.9h.

UV index

Months with the highest UV index are February through May, August through October, with an average maximum UV index of 12. A UV Index of 11, and more, symbolizes an extreme threat to health from the exposure to the Sun's UV radiation for the average person.
Note: In May, the average maximum UV index of 12 translate into the following recommendations:
Practice all-important precautions. Light skin people may get burned in less than 5 minutes. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. A broad-spectrum sunscreen of SPF 30+ should be liberally applied and re-applied every two hours, and immediately after an outdoor workout or a swim. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in May in Cotonou?

In Cotonou, in May, the average high-temperature is 31°C (87.8°F), and the average low-temperature is 24.6°C (76.3°F). The average heat index (a.k.a. 'feels like', 'real feel'), that combines both air temperature and relative humidity, in May is evaluated at 40.9°C (105.6°F).

What is the average humidity in May in Cotonou?

In May, the average relative humidity in Cotonou, Benin, is 80%.

How much does it rain in Cotonou in May?

In Cotonou, in May, it is raining for 11 days, with typically 196.9mm (7.75") of accumulated precipitation.

What months are the sea warmest in Cotonou?

Months with the warmest seawater in Cotonou, Benin, are March through May and November, with an average sea temperature of 29°C (84.2°F).

What is the water temperature in May in Cotonou?

In Cotonou, Benin, in May, the average water temperature is 29°C (84.2°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the average length of the day in May in Cotonou?

In May, the average length of the day is 12.4h.

How long on average sun shines in May in Cotonou?

The average sunshine in May in Cotonou, Benin, is 6.9h.

What is the month with the highest UV index in Cotonou?

Months with the highest UV index in Cotonou are February through May, August through October, with an average maximum UV index of 12.

What is the UV index intensity in May in Cotonou?

In May, the average daily maximum UV index in Cotonou, Benin, is 12. A UV Index estimate of 11, and higher, represents an excessive health risk from unprotected exposure to the UV radiation.
Average temperature in May - Cotonou, Benin
  • Average high temperature in May: 31°C

The warmest month (with the highest average high temperature) is March (31.9°C).
The month with the lowest average high temperature is August (27.8°C).

  • Average low temperature in May: 24.6°C

The month with the highest average low temperature is March (25.9°C).
The coldest month (with the lowest average low temperature) is August (23.4°C).

Average humidity in May - Cotonou, Benin
  • Average humidity in May: 80%

The month with the highest relative humidity is June (84%).
The month with the lowest relative humidity is April (76.5%).

Average rainfall in May - Cotonou, Benin
  • Average rainfall in May: 196.9mm

The wettest month (with the highest rainfall) is June (356mm).
The driest month (with the least rainfall) is January (9.2mm).

Average rainfall days in May - Cotonou, Benin
  • Average rainfall days in May: 11 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (1 days).

Average sea temperature in May - Cotonou, Benin
  • Average sea temperature in May: 29°C

The best months for swimming (with the highest average sea temperature) are March, April, May and November (29°C).
The coldest month (with the lowest average sea temperature) is August (25°C).

Average daylight in May / Average sunshine in May - Cotonou, Benin
  • Average daylight in May: 12.4h

Months with the longest days are June and July (Average daylight: 12.5h).
Months with the shortest days are January, November and December (Average daylight: 11.8h).

  • Average sunshine in May: 6.9h

The month with the most sunshine is November (Average sunshine: 8.1h).
The month with the least sunshine is July (Average sunshine: 4.4h).

Average UV index in May - Cotonou, Benin
  • Average UV index in May: 12

Months with the highest UV index are February, March, April, May, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).