Climate and monthly weather forecast
Santo Antonio, São Tomé and Príncipe

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The climate of Santo Antonio

Santo Antonio, based in São Tomé and Príncipe, hosts the predominant climatic condition, "Af", under the Köppen climate classification. Bound in this geographical area, one observes the typical Tropical rainforest climate, which is characterized by high temperatures and even higher humidity levels. Looking into the yearly analysis, the monthly temperatures are consistently high throughout the year, with small variations from a minimum of 20°C (68°F) to a maximum of up to 29.6°C (85.3°F). As this is a tropical region, no major seasonal differences are witnessed in the temperature department.

Humidity in Santo Antonio fluctuates within the range from 83% to 89%. While this variation may seem narrow, it presents a significant difference when experienced in person. The highest humidity levels generally correspond to the wetter months, in sync with the annual precipitation patterns. Speaking of precipitation, the region receives an abundance of rainfall throughout the year, with exceptionally heavy rains during certain periods. Precipitation varies from a low of 21mm (0.83") in July to a high of 398mm (15.67") in October, which indicates harsh and intense rainy conditions during October.

The sunshine hours hold steady from 2 to a maximum of 4 hours daily. Meanwhile, the sea temperature varies from 26°C (78.8°F) to 29°C (84.2°F) providing warm water bodies throughout the year. The varying daylight hours from 12 to 12.2 hours signal minor changes across the months.

The best time to visit Santo Antonio

Taking into account various factors, including temperature, rainfall, and humidity, the best time to visit Santo Antonio is generally from July to September. During these months, the temperature stabilizes between 26.8°C (80.2°F) to 27.6°C (81.7°F), accompanied by lower rainfall levels, falling between 21mm (0.83") to 89mm (3.5"). Consequently, visitors can expect lower humidity levels, from 83% to 86%, which is considerably more comfortable than during other months. With a consistent sea temperature around 26°C (78.8°F), these months are ideal for activities like swimming and other water sports.

The worst time to visit Santo Antonio

On the flip side, the period from October to December proves the most challenging for a visit to Santo Antonio. Despite slightly lower temperatures, this period experiences an inundation of rainfall, peaking at a staggering 398mm (15.67") in October. This volume of rain is accompanied by a spike in humidity levels reaching up to 89%, contributing to an overall damp and uncomfortable atmosphere. Despite the sea temperature showing resilience with a consistent reading of 27°C (80.6°F), the relentless rainfall can severely limit outdoor activities and overall travel enjoyment.

Spring weather in Santo Antonio

In Santo Antonio, the spring season, broadly defined as months from March to May, comes with prime tropical weather conditions. The temperature ranges from 28.8°C (83.8°F) to 29.6°C (85.3°F), while the minimum temperature stays between 21.9°C (71.4°F) to 22.1°C (71.8°F). The rainfall shows a significant increase from 186mm (7.32") in March to a high of 233mm (9.17") in April and 229mm (9.02") in May. Simultaneously, the sunshine duration remains steady with 4 hours daily, encouraging outdoor activities when the showers break.

Summer weather in Santo Antonio

Transitioning to the summer months from June to August, Santo Antonio's climate remains warm, with temperatures hovering from 26.8°C (80.2°F) to 27.6°C (81.7°F). The marked departure from summer is seen in the drop in rainfall from June's 89mm (3.5") to a minimum of 21mm (0.83") in July before it climbs slightly to 36mm (1.42") towards August. Correspondingly, humidity decreases during these months making the weather moderately dry.

Autumn weather in Santo Antonio

As the season moves into autumn, from September to November, there is a slight increase in temperature with the reading from 27.4°C (81.3°F) to 27.8°C (82°F). Alongside, the precipitation level escalates, flooding up to 398mm (15.67") during October and settling back to 174mm (6.85") in November. The high rainfall significantly impacts the humidity, which increases during these months rendering the climate quite damp and moist.

Winter weather in Santo Antonio

Wrapping up with the winter season, from December to February, the temperature in Santo Antonio varies from 28.6°C (83.5°F) to 29°C (84.2°F). The rainfall settles slightly with a value of 142mm (5.59") in December and continues to decline to 105mm (4.13") and a low of 113mm (4.45") in February. Even so, these readings are relatively high compared to most regions worldwide, indicative of Santo Antonio’s tropical rainforest classification. The winter months also encounter high humidity, making the weather feel even warmer.

Weather in January

High humidity levels characterize the weather in Santo Antonio in January, typically reaching an average of 88%. With the temperature lingering between 22°C (71.6°F) and 29°C (84.2°F), warm and moist conditions persist throughout the month. Weather in January »

Weather in February

A slight decrease in humidity from 88% to 86% happens in February, indicating the approaching dry season. Compared to January, the searing heat tends to mellow down. Rainfall during this month decreases to 105mm (4.13") over an average of 11 days. Weather in February »

Weather in March

Notwithstanding the temperature ranges similar to February, March signals a change in weather with a stunning increase in rainfall to 186mm (7.32"). Contrasted with the subsequent month, March is substantially drier, yet typically warm. Weather in March »

Weather in April

Santo Antonio's weather takes a turn in April, with a significant increase in precipitation to an average of 233mm (9.17"). Side by side with March, April weather exhibits a similar temperature range but differs notably in terms of rainfall. Weather in April »

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. Weather in May »

Weather in June

June welcomes a noticeable shift in Santo Antonio's weather. Rainfall significantly recedes to 89mm (3.5"), suggesting the advent of more comfortable conditions. Compared to the rainier May, June emerges warmer and drier. An average sea temperature from 27°C (80.6°F) to 29°C (84.2°F) ensures swimmers and divers have a pleasant time. Weather in June »

Weather in July

July experiences the driest weather conditions in Santo Antonio, recording an incredibly low rainfall of only 21mm (0.83"). Contrasted with June, July is notably drier yet maintains a similar temperature profile. Daylight hours from 12.2h to 12h, slightly decrease, yet remain sufficient for outdoor activities. Weather in July »

Weather in August

August sees a slight increase in rainfall in Santo Antonio from 21mm (0.83") to 36mm (1.42") but continues to remain drier compared to other months. The weather conditions resemble those in July but with a slight increase in precipitation. Weather in August »

Weather in September

Resuming the wet patterns, September observes a jump in rainfall to 146mm (5.75") in Santo Antonio. The month exhibits a notable difference compared to the drier August. Average daylight stays consistent, with around 12.1 hours of daylight, providing ample time for activities. Weather in September »

Weather in October

In Santo Antonio, October sees the heaviest rainfall throughout the year, accumulating around 398mm (15.67"). In comparison with September, the weather in October turns significantly wetter and a little cooler. Despite the rain-soaked overhead, daylight equalizes the ambiance with an average of 4 hours of sunlight. Weather in October »

Weather in November

November weather sees a reduction in rainfall to 174mm (6.85") in Santo Antonio, making it relatively drier than October. Contrasted with December, November exhibits comparable conditions with slightly higher rainfall. The slight dip in the sea temperature to 27°C (80.6°F) offers a refreshing contrast to the warm climate. Weather in November »

Weather in December

December greets Santo Antonio with a moderate 142mm (5.59") rainfall, lower than November's. The overall temperature, however, increases marginally compared to the previous month. Average daylight reduces to 12 hours but continues to underline the city's sunny personality. Weather in December »
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Frequently asked questions

How many days does it rain in Santo Antonio?

Throughout the year, in Santo Antonio, São Tomé and Príncipe, there are 188 rainfall days, and 1872mm (73.7") of precipitation is accumulated.

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

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

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 are the warmest months in Santo Antonio?

In Santo Antonio, February and March are characterised by the peak of temperatures, recording an average high of 29.6°C (85.3°F).

What months are 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 are the least humid months in Santo Antonio?

June through August, with an average relative humidity of 83%, are the least humid months in Santo Antonio.

When are the longest days in Santo Antonio?

The month with the longest days is June, with an average of 12h and 12min of daylight.

What is the month with the lowest UV index in Santo Antonio?

The months with the lowest UV index in Santo Antonio, São Tomé and Príncipe, are June, July and December, with an average maximum UV index of 11.

What is the coldest time of year in Santo Antonio?

Santo Antonio, São Tomé and Príncipe, experiences its lowest temperatures in July, with an average peak of 26.8°C (80.2°F) and a low of 20.2°C (68.4°F).

What is the driest month in Santo Antonio?

July is the month with the least rainfall in Santo Antonio. Rain falls for 14 days and accumulates 21mm (0.83") of precipitation.

When is the sea coldest in Santo Antonio?

July through September, with an average sea temperature of 26°C (78.8°F), are months with the coldest seawater in Santo Antonio, São Tomé and Príncipe.

What is the month with the least sunshine in Santo Antonio?

With an average of 2h of sunshine, September has the least sunshine of the year in Santo Antonio, São Tomé and Príncipe.

What is the most humid month in Santo Antonio?

With an average relative humidity of 89%, October is the most humid month.

What is the wettest month in Santo Antonio?

The month with the most rainfall in Santo Antonio is October, when the rain falls for 25 days and typically aggregates up to 398mm (15.67") of precipitation.

What is the month with the shortest days in Santo Antonio?

With an average of 12h and 0min of daylight, December has the shortest days of the year in Santo Antonio, São Tomé and Príncipe.

Is there Daylight Saving Time (DST) in Santo Antonio?

Santo Antonio does not observe Daylight Saving Time (DST). GMT timezone is used over the entire year.

Average temperature
Santo Antonio, São Tomé and Príncipe

Average temperature - Santo Antonio, São Tomé and Príncipe

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).

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).

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Average humidity
Santo Antonio, São Tomé and Príncipe

Average humidity - Santo Antonio, São Tomé and Príncipe

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

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Average rainfall
Santo Antonio, São Tomé and Príncipe

Average rainfall - Santo Antonio, São Tomé and Príncipe

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

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Average rainfall days
Santo Antonio, São Tomé and Príncipe

Average rainfall days - Santo Antonio, São Tomé and Príncipe

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

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Average sea temperature
Santo Antonio, São Tomé and Príncipe

Average sea temperature - Santo Antonio, São Tomé and Príncipe

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).

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

Average daylight / Average sunshine - Santo Antonio, São Tomé and Príncipe

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).

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).

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Average UV index
Santo Antonio, São Tomé and Príncipe

Average UV index - Santo Antonio, São Tomé and Príncipe

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).

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Santo Antonio, São Tomé and Príncipe

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