May weather forecast
Ribeira Afonso, São Tomé and Príncipe

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Weather in May

Entering May, the change in weather patterns becomes more noticeable in Ribeira Afonso. Temperatures slightly dip to a range of 26.3°C (79.3°F) to 27.8°C (82°F). However, it is the rise in relative humidity to 79% that significantly alters the feel of the climate. While rainfall decreases slightly to 122mm (4.8"), the pressure slightly rises to 1011.3 mB, marking the beginning of the region's tropical monsoon season. Despite the changes, the weather continues to be warm and humid, ideal for nature lovers.

Temperature

The advent of May signifies a minor shift to an average high-temperature of a still moderately hot 27.8°C (82°F), aligning closely with April. Ribeira Afonso experiences a minimal drop from daytime high temperatures, recording an average low-temperature of 26.3°C (79.3°F) throughout May.

Heat index

In May, the average heat index is evaluated at a tropical 31°C (87.8°F). Enduring exposure and ongoing activity could cause a sense of fatigue and subsequent heat cramps.
It is essential to grasp that the heat index's numbers are for shade and light wind settings. Direct sunlight might cause an increase of up to 15 Fahrenheit (8 Celsius) degrees in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'real feel', ties air temperature with relative humidity to produce the perceived temperature sensation. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. One's exposure to direct sunlight has the potential to intensify the heat sensation, increasing the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In May, the average relative humidity is 79%.

Rainfall

In May, the rain falls for 20.5 days. Throughout May, 122mm (4.8") of precipitation is accumulated. Throughout the year, there are 241.7 rainfall days, and 1287mm (50.67") of precipitation is accumulated.

Daylight

In Ribeira Afonso, the average length of the day in May is 12h and 8min.
On the first day of May, sunrise is at 05:26 and sunset at 17:33. On the last day of the month, sunrise is at 05:27 and sunset at 17:34 GMT.

Sunshine

In May, the average sunshine is 7.6h.

UV index

The months with the highest UV index in Ribeira Afonso are January through May, October through December, with an average maximum UV index of 7. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: An average UV index of 7 in May transforms into this advice:
Eschew overexposure. Those with light skin may suffer burns in fewer than 20 minutes. Between 10 a.m. and 4 p.m., the Sun's UV radiation is at its peak. Limit your exposure to direct sunlight during these hours. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.

Frequently asked questions

What is the average May temperature?

In May, the average high-temperature and low-temperature are 27.8°C (82°F) and 26.3°C (79.3°F) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in May is evaluated at 31°C (87.8°F).

What is the average humidity in May?

The average relative humidity in May is 79%.

How many days does it rain in May?

In Ribeira Afonso, in May, during 20.5 rainfall days, 122mm (4.8") of precipitation is typically accumulated.

What is the average length of the day in May?

In Ribeira Afonso, the average day length in May is 12h and 8min.

When is the sunrise / sunset in May?

In May, on the first day of the month, sunrise is at 05:26 and sunset at 17:33. On the last day of the month, in Ribeira Afonso, sunrise is at 05:27 and sunset at 17:34 GMT.

How long on average sun shines in May in Ribeira Afonso?

In May, the average sunshine duration is 7.6h.

When is the highest UV index?

The months with the highest UV index are January through May, October through December, with an average maximum UV index of 7.

How high is the UV index in May?

In Ribeira Afonso, the average daily maximum UV index in May is 7. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to Sun's UV rays.

Average temperature in May
Ribeira Afonso, São Tomé and Príncipe

Average temperature in May - Ribeira Afonso, São Tomé and Príncipe
  • Average high temperature in May: 27.8°C

The warmest month (with the highest average high temperature) is March (28.8°C).
The month with the lowest average high temperature is July (24.5°C).

  • Average low temperature in May: 26.3°C

The month with the highest average low temperature is March (27.5°C).
The coldest month (with the lowest average low temperature) is July (23°C).

Average pressure in May
Ribeira Afonso, São Tomé and Príncipe

Average pressure in May - Ribeira Afonso, São Tomé and Príncipe
  • Average pressure in May: 1011.3mbar

The month with the highest atmospheric pressure is July (1014.3mbar).
The month with the lowest atmospheric pressure is February (1009.8mbar).

Average wind speed in May
Ribeira Afonso, São Tomé and Príncipe

Average wind speed in May - Ribeira Afonso, São Tomé and Príncipe
  • Average wind speed in May: 13km/h

The windiest month (with the highest average wind speed) is July (17.7km/h).
The calmest month (with the lowest average wind speed) is December (10.8km/h).

Average humidity in May
Ribeira Afonso, São Tomé and Príncipe

Average humidity in May - Ribeira Afonso, São Tomé and Príncipe
  • Average humidity in May: 79%

The months with the highest relative humidity are August, September and October (83%).
The month with the lowest relative humidity is March (76%).

Average rainfall in May
Ribeira Afonso, São Tomé and Príncipe

Average rainfall in May - Ribeira Afonso, São Tomé and Príncipe
  • Average rainfall in May: 122mm

The wettest month (with the highest rainfall) is November (224mm).
The driest month (with the least rainfall) is July (9mm).

Average rainfall days in May
Ribeira Afonso, São Tomé and Príncipe

Average rainfall days in May - Ribeira Afonso, São Tomé and Príncipe
  • Average rainfall days in May: 20.5 days

The month with the highest number of rainy days is December (28.6 days).
The month with the least rainy days is June (7.3 days).

Average daylight in May /
Average sunshine in May
Ribeira Afonso, São Tomé and Príncipe

Average daylight in May / Average sunshine in May - Ribeira Afonso, São Tomé and Príncipe
  • Average daylight in May: 12h and 1min

The month with the longest days is June (Average daylight: 12h and 6min).
The months with the shortest days are February and October (Average daylight: 12h and 6min).

  • Average sunshine in May: 7h and 4min

The month with the most sunshine is February (Average sunshine: 8h and 36min).
The month with the least sunshine is August (Average sunshine: 5h and 0min).

Average sunshine days in May
Ribeira Afonso, São Tomé and Príncipe

Average sunshine days in May - Ribeira Afonso, São Tomé and Príncipe
  • Average sunshine days in May: 9.2 days

The month with the most sunshine days is June (16.4 days).
The month with the least sunshine days is December (1.5 days).

Average UV index in May
Ribeira Afonso, São Tomé and Príncipe

Average UV index in May - Ribeira Afonso, São Tomé and Príncipe
  • Average UV index in May: 7

The months with the highest UV index are January, February, March, April, May, October, November and December (UV index 7).
The month with the lowest UV index is July (UV index 5).

Average cloud cover in May
Ribeira Afonso, São Tomé and Príncipe

Average cloud cover in May - Ribeira Afonso, São Tomé and Príncipe
  • Average cloud cover in May: 44

The month with the most cloud cover is August (Cloud cover 65).
The month with the least cloud cover is February (Cloud cover 37).

Average visibility in May
Ribeira Afonso, São Tomé and Príncipe

Average visibility in May - Ribeira Afonso, São Tomé and Príncipe
  • Average visibility in May: 10km

The months with the highest visibility are January, February, March, April, May, June, July, August, September and December (10km).
The months with the lowest visibility are October and November (9km).

Ribeira Afonso, São Tomé and Príncipe

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