May weather forecast
São João, Guinea-Bissau

The last month of the spring, May, is another hot month in São João, Guinea-Bissau, with an average temperature varying between 24.4°C (75.9°F) and 33.7°C (92.7°F).

Temperature

May's arrival brings an average high-temperature of a hot 33.7°C (92.7°F), slightly deviating from April's 35°C (95°F). May brings with it a nighttime average temperature of 24.4°C (75.9°F) in São João.

Heat index

The heat index value for May is evaluated at an extremely hot 41°C (105.8°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. If exposed to direct sunlight, the heat index could climb by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is derived by integrating air temperature with the existing relative humidity to express the perceived warmth. The perception of temperature can be subjective, varying based on activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. Recognize that direct exposure to the sun can escalate the heat effect, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are particularly important for children. Kids are generally in more danger than adults because they perspire less. Their large skin surface area compared to their small bodies and the excessive heat due to their actions raises their risk.
Perspiring is how the human body naturally cools down, as sweat's evaporation takes away excess heat. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. Heat-related challenges, like dehydration, can be anticipated when body heat isn't managed effectively.

Humidity

In São João, the average relative humidity in May is 60%.

Rainfall

In São João, in May, during 3.8 rainfall days, 7mm (0.28") of precipitation is typically accumulated. In São João, Guinea-Bissau, during the entire year, the rain falls for 107.5 days and collects up to 726mm (28.58") of precipitation.

Daylight

The average length of the day in May is 12h and 40min.
On the first day of May in São João, sunrise is at 06:42 and sunset at 19:15. On the last day of the month, sunrise is at 06:36 and sunset at 19:22 GMT.

Sunshine

The months with the most sunshine in São João are March through May, with an average of 9.9h of sunshine.

UV index

January through December, with an average maximum UV index of 7, are months with the highest UV index. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A daily maximum UV index of 7 in May translates into the following instructions:
Exercise precautions and adapt sun safety practices. Defence against skin and eye affliction is paramount. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.