May weather forecast
Cotonou, Benin

May brings a gradual decline in high temperatures in Cotonou, while the rainfall reaches its yearly zenith. The increase in precipitation, which results in 197mm (7.76") of rainfall, verifies May as the month with the highest rainfall. Interestingly, the city's long daylight duration of 12.4 hours assists in maintaining an elevated UV index of 12 units. The city experiences minor fluctuations in temperature levels and a small decrease in sea temperature compared to the previous month. This month, combined with its high levels of humidity, certainly conveys a highly tropical climate to its residents and tourists.

Temperature

May in Cotonou notes an average high-temperature of a still tropical 31°C (87.8°F), subtly differing from April's 31.6°C (88.9°F). Nighttime temperatures consistently average a moderately hot 24.6°C (76.3°F) during May.

Heat index

For most parts of May, the heat index is computed to be a scorching 41°C (105.8°F). Extra precautions are necessary, heat cramps and heat exhaustion are plausible outcomes. Extended activity could lead to heatstroke.
Evaluating the heat index requires understanding its values in the shade and with gentle winds. Being under direct sunlight might amplify the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is a calculation that merges air temperature and relative humidity to depict the sensation of warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Consider the sun's direct rays and their impact; they can potentially increase the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for babies and toddlers. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. When relative humidity is on the rise, it curtails evaporation, thereby reducing the heat elimination from the body and causing the feeling of being excessively hot. Heat absorption that surpasses the body's shedding capability can lead to overheating and varying levels of dehydration.

Humidity

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

Rainfall

In Cotonou, Benin, in May, during 11 rainfall days, 197mm (7.76") of precipitation is typically accumulated. Throughout the year, in Cotonou, Benin, there are 75 rainfall days, and 1308mm (51.5") of precipitation is accumulated.

Sea temperature

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

In May, the average length of the day is 12h and 25min.
On the first day of the month, sunrise is at 06:36 and sunset at 18:58. On the last day of May, sunrise is at 06:34 and sunset at 19:02 WAT.

Sunshine

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

UV index

February through May, August through October, with an average maximum UV index of 12, are months with the highest UV index. A UV Index value of 11, and more, symbolizes an extreme health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 12 during May translates into these guidelines:
Enforce every key safety measure. Those with light skin might get burns in a matter of minutes. Try to minimize direct Sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Also note that objects like parasols or canopies might not provide complete sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Regardless of cloud cover, it's recommended to apply generously and reapply often a sunscreen with an SPF of at least 30, especially after swimming or any outdoor activity. Warning! The reflection of sand and water increases the UV dose.