May weather forecast
Santo Antonio, São Tomé and Príncipe

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Weather in May

Like April, the weather in May in Santo Antonio also sees high rainfall, but with a marginal decrease to 229mm (9.02"). In comparison to the subsequent June, May has wetter and warmer weather. Sea temperatures remain warm, making May an excellent month for water activities despite the rain. Periods of sunshine and drizzle intersperse throughout the month. Verdant landscapes flourish due to the weather conditions, perfect for picturesque walks.

Temperature

Santo Antonio, São Tomé and Príncipe, records an average high-temperature of a still moderately hot 28.8°C (83.8°F) in May, closely mirroring the climate of the previous month. Santo Antonio, in May, observes a steady average low-temperature of 21.9°C (71.4°F).

Heat index

For May, the heat index is computed to be a very hot 36°C (96.8°F). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.
It is important to note that the heat index values are for shaded areas and light wind scenarios. The heat index has the possibility to be enhanced by 15 Fahrenheit (8 Celsius) degrees when there is direct sun exposure.
Note: The heat index, also known as 'apparent temperature' or 'real feel', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Considering the impact of direct sunlight, it's possible for the heat index to surge by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular importance for children. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. During conditions of high air temperature and humidity (high heat index), the body's ability to perspire is inhibited, increasing the sensation of warmth. Heat-related disorders may develop if heat gain in the body overshadows its cooling capacity, leading to elevated temperatures.

Humidity

In May, the average relative humidity is 88%.

Rainfall

In Santo Antonio, in May, it is raining for 18 days, with typically 229mm (9.02") of accumulated precipitation. Throughout the year, in Santo Antonio, São Tomé and Príncipe, there are 188 rainfall days, and 1872mm (73.7") of precipitation is accumulated.

Sea temperature

February through May, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Santo Antonio.
Note: For swimming, diving, and various water activities, the temperatures ranging from 25°C (77°F) to 29°C (84.2°F) are seen as highly enjoyable and comfortable for extended durations without any discomfort.

Daylight

The average length of the day in May is 12h and 11min.
On the first day of May in Santo Antonio, sunrise is at 05:22 and sunset at 17:32. On the last day of the month, sunrise is at 05:21 and sunset at 17:34 GMT.

Sunshine

The months with the most sunshine in Santo Antonio are January through June, November and December, with an average of 4h of sunshine.

UV index

The months with the highest UV index in Santo Antonio, São Tomé and Príncipe, are January through May, August through November, with an average maximum UV index of 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, a daily maximum UV index of 12 leads to the following instructions:
Execute every important safeguard, as unprotected skin and eyes could burn within moments. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Directly after outdoor activities or swimming, a broad-spectrum sunscreen with SPF 30+ should be applied generously and reapplied frequently. Take note! Sand and water reflections strengthen the Sun's UV exposure.

Frequently asked questions

How hot is May in Santo Antonio?

The high-temperature, in May, in Santo Antonio, records 28.8°C (83.8°F), while the low-temperature is 21.9°C (71.4°F). The average heat index (a.k.a. 'real feel', 'feels like'), which factors the actual air temperature with the relative humidity, in May is computed to be 36°C (96.8°F).

What is the average humidity in May in Santo Antonio?

The average relative humidity in May in Santo Antonio, São Tomé and Príncipe, is 88%.

How much does it rain in Santo Antonio in May?

In Santo Antonio, São Tomé and Príncipe, during May, the rain falls for 18 days and regularly aggregates up to 229mm (9.02") of precipitation.

When is the sea warmest in Santo Antonio?

February through May, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in Santo Antonio.

What is the water temperature in May in Santo Antonio?

In Santo Antonio, São Tomé and Príncipe, in May, the average water temperature is 29°C (84.2°F). 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.

What is the average length of the day in May in Santo Antonio?

In May, the average day length is 12h and 11min.

When are sunrise and sunset in May in Santo Antonio?

In May, on the first day of the month, sunrise is at 05:22 and sunset at 17:32. On the last day of the month, sunrise is at 05:21 and sunset at 17:34 GMT.

What are the months with the most sunshine in Santo Antonio?

January through June, November and December, with an average of 4h of sunshine, are months with the most sunshine in Santo Antonio.

How long on average sun shines in May in Santo Antonio?

In May, the average sunshine duration is 4h.

When is the highest UV index in Santo Antonio?

January through May, August through November, with an average maximum UV index of 12, are months with the highest UV index in Santo Antonio, São Tomé and Príncipe.

What is the UV index reading in May in Santo Antonio?

In May, the average daily maximum UV index is 12. A UV Index reading of 11, and higher, represents an excessive health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in May
Santo Antonio, São Tomé and Príncipe

Average temperature in May - Santo Antonio, São Tomé and Príncipe
  • Average high temperature in May: 28.8°C

The warmest months (with the highest average high temperature) are February and March (29.6°C).
The month with the lowest average high temperature is July (26.8°C).

  • Average low temperature in May: 21.9°C

The month with the highest average low temperature is April (22.1°C).
The coldest month (with the lowest average low temperature) is February (20°C).

Average humidity in May
Santo Antonio, São Tomé and Príncipe

Average humidity in May - Santo Antonio, São Tomé and Príncipe
  • Average humidity in May: 88%

The month with the highest relative humidity is October (89%).
The months with the lowest relative humidity are June, July and August (83%).

Average rainfall in May
Santo Antonio, São Tomé and Príncipe

Average rainfall in May - Santo Antonio, São Tomé and Príncipe
  • Average rainfall in May: 229mm

The wettest month (with the highest rainfall) is October (398mm).
The driest month (with the least rainfall) is July (21mm).

Average rainfall days in May
Santo Antonio, São Tomé and Príncipe

Average rainfall days in May - Santo Antonio, São Tomé and Príncipe
  • Average rainfall days in May: 18 days

The month with the highest number of rainy days is October (25 days).
The month with the least rainy days is June (7 days).

Average sea temperature in May
Santo Antonio, São Tomé and Príncipe

Average sea temperature in May - Santo Antonio, São Tomé and Príncipe
  • Average sea temperature in May: 29°C

The best months for swimming (with the highest average sea temperature) are February, March, April and May (29°C).
The coldest months (with the lowest average sea temperature) are July, August and September (26°C).

Average daylight in May /
Average sunshine in May
Santo Antonio, São Tomé and Príncipe

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

The month with the longest days is June (Average daylight: 12h and 12min).
The month with the shortest days is December (Average daylight: 12h and 0min).

  • Average sunshine in May: 4h

The months with the most sunshine are January, February, March, April, May, June, November and December (Average sunshine: 4h).
The month with the least sunshine is September (Average sunshine: 2h).

Average UV index in May
Santo Antonio, São Tomé and Príncipe

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

The months with the highest UV index are January, February, March, April, May, August, September, October and November (UV index 12).
The months with the lowest UV index are June, July and December (UV index 11).

Santo Antonio, São Tomé and Príncipe

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