São Tomé
São Tomé and Príncipe
Long-term weather forecast
Long-term weather forecast

May weather forecast and climate
São Tomé, São Tomé and Príncipe

Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach
Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe, with palm trees along the beautiful beach
May, the last month of the spring, in São Tomé, is also a moderately hot month, with temperature in the range of an average high of 29.3°C (84.7°F) and an average low of 22.6°C (72.7°F).

Temperature

In May, the average high-temperature is practically the same as in April - a warm 29.3°C (84.7°F). The average low-temperature, in São Tomé, is 22.6°C (72.7°F).

Heat index

The average heat index is evaluated at a sweltering 36.6°C (97.9°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
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 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, wind). 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 especially crucial for babies and toddlers. 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. High relative humidity reduces the evaporation rate, resulting in a lower heat removal rate from the body, causing the perception of being overheated. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in São Tomé is 84%.

Rainfall

In São Tomé, during May, the rain falls for 10 days and regularly aggregates up to 113mm (4.4") of precipitation. Throughout the year, in São Tomé, there are 94 rainfall days, and 885mm (34.8") of precipitation is accumulated.

Sea temperature

In São Tomé, the average water temperature is 28°C (82.4°F).
Note: Water temperature between 25°C (77°F) and 29°C (84.2°F) is regarded as very warm and enjoyable by all. With these temperatures, water activities are pleasurable, without feeling uncomfortable for prolonged periods.

Daylight

Months with the longest days in São Tomé, São Tomé and Príncipe, are January through December, with an average of 12.1h of daylight. Months with the shortest days are January through December, with an average of 12.1h of daylight.

Sunshine

In May, the average sunshine is 4.7h.

UV index

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index. A UV Index reading of 11, and higher, represents an extreme health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 12 transform into the following instructions:
Take all necessary precautions, as unprotected skin can burn in 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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 strength of the UV rays is significantly increased by the reflection of the water and sand.

What is the temperature in May in São Tomé?

In São Tomé, in May, the average high-temperature is 29.3°C (84.7°F), and the average low-temperature is 22.6°C (72.7°F). The average heat index (a.k.a. 'real feel', 'apparent temperature'), that combines relative humidity and air temperature, in May is estimated at 36.6°C (97.9°F).

What is the average humidity in May in São Tomé?

The average relative humidity in May is 84%.

How many days does it rain in May in São Tomé?

In May, in São Tomé, the rain falls for 10 days. Throughout May, 113mm (4.4") of precipitation is accumulated.

What is the water temperature in May in São Tomé?

In May, the average sea temperature in São Tomé is 28°C (82.4°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.

When are the longest days in São Tomé?

January through December, with an average of 12.1h of daylight, are months with the longest days.

What is the month with the shortest days in São Tomé?

January through December, with an average of 12.1h of daylight, are months with the shortest days in São Tomé.

How many hours of daylight does São Tomé have in May?

In May, the average length of the day in São Tomé, São Tomé and Príncipe, is 12.1h.

How many hours of sunshine does São Tomé have in May?

In May, the average sunshine in São Tomé is 4.7h.

What is the month with the highest UV index in São Tomé?

January through May, August through December, with an average maximum UV index of 12, are months with the highest UV index in São Tomé.

How high is the UV index in May in São Tomé?

The average daily maximum UV index in May in São Tomé, São Tomé and Príncipe, 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 - São Tomé, São Tomé and Príncipe
  • Average high temperature in May: 29.3°C

The warmest month (with the highest average high temperature) is March (30.2°C).
The month with the lowest average high temperature is July (27.3°C).

  • Average low temperature in May: 22.6°C

Months with the highest average low temperature are March, April and May (22.6°C).
The coldest month (with the lowest average low temperature) is July (20.4°C).

Average humidity in May - São Tomé, São Tomé and Príncipe
  • Average humidity in May: 84%

Months with the highest relative humidity are January, November and December (85%).
The month with the lowest relative humidity is July (77%).

Average rainfall in May - São Tomé, São Tomé and Príncipe
  • Average rainfall in May: 113mm

The wettest month (with the highest rainfall) is March (131mm).
The driest month (with the lowest rainfall) is July (0mm).

Average rainfall days in May - São Tomé, São Tomé and Príncipe
  • Average rainfall days in May: 10 days

Months with the highest number of rainy days are March and October (12 days).
The month with the lowest number of rainy days is July (2 days).

Average sea temperature in May - São Tomé, São Tomé and Príncipe
  • Average sea temperature in May: 28°C

Best months for swimming (with the highest average sea temperature) are February, March and April (29°C).
The coldest month (with the lowest average sea temperature) is July (25°C).

Average daylight in May / Average sunshine in May - São Tomé, São Tomé and Príncipe
  • Average daylight in May: 12.1h

Months with the longest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).
Months with shortest days are January, February, March, April, May, June, July, August, September, October, November and December (Average daylight: 12.1h).

  • Average sunshine in May: 4.7h

The month with most sunshine is June (Average sunshine: 5.5h).
The month with least sunshine is October (Average sunshine: 3.7h).

Average UV index in May - São Tomé, São Tomé and Príncipe
  • Average UV index in May: 12

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