April weather forecast
São Tomé, São Tomé and Príncipe

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Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe
Clear blue water crashing on the big shore rocks on the beach in São Tomé, São Tomé and Principe

Weather in April

The weather becomes a mixed bag as April approaches. The temperature range remains static from 22.6°C (72.7°F) to 30.1°C (86.2°F) compared to March and something more distinct is noticeable. Despite the constant rainfall from the preceding month, the overall precipitation count lowers slightly. However, it's not all cloudy skies and dreariness, as the month actually sees the length of sunny periods remaining consistent with the earlier months.

Temperature

The commencement of April records an average high-temperature of a still tropical 30.1°C (86.2°F), barely varying from March's 30.2°C (86.4°F). Nighttime temperatures hover around an average low of 22.6°C (72.7°F) in April.

Heat index

For April, the heat index is calculated to be a fiery hot 39°C (102.2°F). Take extra safety measures to prevent heat exhaustion and heat cramps. Heatstroke could follow lengthy activity.
Know that the heat index computations account for shaded terrains and slight winds. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', quantifies the warmth felt when relative humidity is considered. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Children often do not understand the need to rest and hydrate. Thirst is a late manifestation of dehydration - therefore, it is essential to stay hydrated, particularly during prolonged physical activities.
The human body has a built-in cooling mechanism through perspiration; evaporating sweat dissipates the excess heat. An upsurge in relative humidity affects normal body cooling mechanisms by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. 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

In São Tomé, the average relative humidity in April is 83%.

Rainfall

In São Tomé, during April, the rain falls for 11 days and regularly aggregates up to 122mm (4.8") of precipitation. Throughout the year, there are 94 rainfall days, and 885mm (34.84") of precipitation is accumulated.

Sea temperature

February through April, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in São Tomé, São Tomé and Príncipe.
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are ideal for all water activities, offering enjoyment without causing discomfort over extended periods.

Daylight

In April, the average length of the day is 12h and 7min.
On the first day of the month, sunrise is at 05:33 and sunset at 17:40. On the last day of April, sunrise is at 05:26 and sunset at 17:34 GMT.

Sunshine

In April, the average sunshine in São Tomé, São Tomé and Príncipe, is 4.2h.

UV index

The months with the highest UV index are January through May, August through December, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV rays for average individuals.
Note: In April, a daily maximum UV index of 12 leads to the following instructions:
Enforce every key safety measure. Those with light skin might get burns in a matter of 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. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Broad-spectrum sunscreen with an SPF of 30 or above should be applied generously and reapplied every two hours and right after any outdoor activity or swim. Be vigilant! The Sun's UV rays get a boost from sand and water reflections.
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Frequently asked questions

How hot is April in São Tomé?

The average high-temperature, in April, in São Tomé, is 30.1°C (86.2°F), while the average low-temperature is 22.6°C (72.7°F). In April, the average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 39°C (102.2°F).

What is the average humidity in April in São Tomé?

In April, the average relative humidity is 83%.

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

In São Tomé, São Tomé and Príncipe, in April, it is raining for 11 days, with typically 122mm (4.8") of accumulated precipitation.

When is the sea warmest in São Tomé?

February through April, with an average sea temperature of 29°C (84.2°F), are months with the warmest seawater in São Tomé, São Tomé and Príncipe.

What is the water temperature in April in São Tomé?

In São Tomé, the average seawater temperature in April is 29°C (84.2°F). For any water activity, surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are considered as excellent and extremely pleasant for lengthened periods.

What is the average length of the day in April in São Tomé?

In April, the average day length in São Tomé is 12h and 7min.

When is the sunrise / sunset in April in São Tomé?

On the first day of April in São Tomé, sunrise is at 05:33 and sunset at 17:40. On the last day of the month, sunrise is at 05:26 and sunset at 17:34 GMT.

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

In São Tomé, the average sunshine duration in April is 4.2h.

What are the months with the highest UV index in São Tomé?

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

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

In São Tomé, the average daily maximum UV index in April is 12. A UV Index value of 11, and more, symbolizes an excessive health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in April
São Tomé, São Tomé and Príncipe

Average temperature in April - São Tomé, São Tomé and Príncipe
  • Average high temperature in April: 30.1°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 April: 22.6°C

The 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).

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Average humidity in April
São Tomé, São Tomé and Príncipe

Average humidity in April - São Tomé, São Tomé and Príncipe
  • Average humidity in April: 83%

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

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Average rainfall in April
São Tomé, São Tomé and Príncipe

Average rainfall in April - São Tomé, São Tomé and Príncipe
  • Average rainfall in April: 122mm

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

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Average rainfall days in April
São Tomé, São Tomé and Príncipe

Average rainfall days in April - São Tomé, São Tomé and Príncipe
  • Average rainfall days in April: 11 days

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

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Average sea temperature in April
São Tomé, São Tomé and Príncipe

Average sea temperature in April - São Tomé, São Tomé and Príncipe
  • Average sea temperature in April: 29°C

The 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).

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Average daylight in April /
Average sunshine in April
São Tomé, São Tomé and Príncipe

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

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

  • Average sunshine in April: 4h and 1min

The month with the most sunshine is June (Average sunshine: 5h and 30min).
The month with the least sunshine is October (Average sunshine: 3h and 42min).

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Average UV index in April
São Tomé, São Tomé and Príncipe

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

The 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).

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São Tomé, São Tomé and Príncipe

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