Climate and monthly weather forecast
Saint John's, Antigua and Barbuda

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Sunset in St John
Sunset in St John's Harbour, Antigua

The climate of Saint John's

Saint John's, the capital city of Antigua and Barbuda, is nestled in the warmth of the Eastern Caribbean Sea. The climatic conditions of this island city are primarily dictated by the Köppen climate grouping - Af, also known as a Tropical Rainforest Climate. Geographically, Saint John's is positioned advantageously to enjoy a balmy, warm atmosphere almost all year round backed by plentiful rainfall throughout the year.

Analyzing the climate data, it is evident that the temperature and rainfall are relatively steady. The monthly average high temperature ranges from 28.3°C (82.9°F) to a peak of 31.2°C (88.2°F), depicting warmth and humidity. Low temperatures too oscillate in a narrow range between 22.2°C (72°F) to 25.5°C (77.9°F), ensuring mildly warm nights. Rainfall patterns are consistent throughout the year with monthly averages between 45mm (1.77") to 142mm (5.59"). With evenly distributed rainfall, the city does not experience any dry season, a characteristic signature of the Tropical Rainforest climate.

Fluctuations in daylight hours can also be observed, with a climb from 11.2 hours in January to a maximum of 13.1 hours by June, before a decline back to 11.1 hours in December. A distinctive highlight of Saint John's climate is the absence of any extreme weather changes. Instead, it carries the gift of a uniform, tropical climate, featuring warm temperatures, high humidity, and significant rainfall throughout the year.

The best time to visit Saint John's

While Saint John's presents a welcoming climate year-round, certain months offer a more pleasing setting for visitors and tourists. February and March surface as favourable periods carrying the least amount of rainfall, averaging 45mm (1.77") and 46mm (1.81") respectively. Accompanied by an average high temperature that gracefully hovers around the 28°C (82.4°F) mark, these months deliver prime conditions for engaging outdoor and water activities while soaking in the tropical sunshine.

The worst time to visit Saint John's

Though Saint John's maintains a reasonably stable climate through the year, the months between September and November witness a considerable surge in the rainfall, with averages exceeding 130mm (5.12"). Coupled with high temperatures peaking around 30°C (86°F), humidity levels during these months can make sightseeing and outdoor activities challenging. Tourists seeking to avoid the wettest months should consider planning their visit outside this period.

Spring weather in Saint John's

Spring in Saint John's unfolds from March to May. Temperatures progressively rise from 28.8°C (83.8°F) to 30.2°C (86.4°F) whereas nights become warmer, moving from 22.7°C (72.9°F) to 24.5°C (76.1°F). Rainfall charts a rising trend as well, growing from 46mm (1.81") in March to 90mm (3.54") in May. This period combines warmth with mild rainfall, conferring an enjoyable ambiance to indulge in outdoor activities.

Summer weather in Saint John's

June introduces Summer season in Saint John's and runs till August. Daytime temperatures continue to rise, peaking at 31.2°C (88.2°F) in August, while nights also remain warm around 25°C (77°F) mark. Rainfall averages also increase, peaking at 99mm (3.9") in August. Despite the onset of heavier showers, the months retain long daylight hours, providing ample sunshine for beach activities and sightseeing.

Autumn weather in Saint John's

Autumn, occurring from September to November, sees the heaviest rainfall with monthly averages going beyond 130mm (5.12"). Daytime temperatures exhibit a slight drop from 31.1°C (88°F) to 29.8°C (85.6°F), and nights also cool off to a range from 25°C (77°F) to 23.9°C (75°F). Despite the downpour, the ambiance remains warm and humid.

Winter weather in Saint John's

December marks Winter in Saint John's, with temperatures moderating to an agreeable range of 28.3°C (82.9°F) to 28.8°C (83.8°F), and nights growing slightly cooler hovering around 23°C (73.4°F). Rainfall reduces considerably to an average of 83mm (3.27") in December. Although the daylight hours are at their shortest at 11.1 hours, the winter months promise warmth, moderate rainfall and ample of sunlit hours for various outdoor activities.

Weather in January

Initiating the year in Saint John's, Antigua and Barbuda with January shows a myriad of climatic alterations. Daylight hours slightly begin to increase, marking the end of the shortest days of the year. Moreover, the climate transitions from a wet to a slightly drier season. Weather in January »

Weather in February

February in Saint John's signifies an ongoing trend of increasing temperatures along with longer daylight hours. The rain precipitation slightly reduces when compared with January's weather, leading to a drier month. Furthermore, February marks the beginning of a trend with decreasing rainfall days, which extends into the following month. Weather in February »

Weather in March

The weather in March further signifies the arrival of warmer and longer days in Saint John's, with temperature highs reaching 28.8°C (83.8°F) on average. The trend of diminishing rainfall continues, leading to the beginnings of a drier month when compared to February. Weather in March »

Weather in April

April in Saint John's brings average high temperatures of 29.4°C (84.9°F), showcasing notably warmer days than the preceding months. There is an increase in rainfall compared to March, marking a wetter season. There's also a small rise in the volume of rainfall days, opposing the decreasing trend from the preceding months. Weather in April »

Weather in May

May in Saint John's presents even warmer temperatures and longer daylight hours than its preceding month. Yet, it displays an opposing trend in humidity levels from the mass rainfall. The volume of rain escalated drastically to 90mm (3.54"), revealing an increase from the past month. Weather in May »

Weather in June

June, in Saint John's, signals the arrival of the warmest period of the year with daylight hours peaking. Although the amount of rainfall decreases from the month of May, it remains significantly high, following the ongoing wet conditions. Weather in June »

Weather in July

Despite the weather conditions being typically warm in July in Saint John's, the average maximum temperature sees a slight increase from June. Uniquely, July bears the peak of the rainy season, with a staggering rise in rainfall to 87mm (3.43"). Weather in July »

Weather in August

August marks the continuation of the sweltering season in Saint John's with remarkable high temperatures. The highest temperature in the year, averaging 31.2°C (88.2°F), is recorded in August, accentuating its status as the hottest month. Weather in August »

Weather in September

In September, while temperatures in Saint John's start to slightly decrease, they remain high, indicating the continuation of warm conditions. Noticeably, this month accounts for the heaviest rainfall of the year, totaling 132mm (5.2"). Weather in September »

Weather in October

October signifies cooler weather in Saint John's with noticeable decreases in both daily high and low temperatures. However, the climate remains characterized by high volumes of rain, although these amounts see a subtle decrease from the previous month. Weather in October »

Weather in November

November in Saint John's records cooler days and nights than the previous months. Simultaneously, the decrease in temperatures is accompanied by a tailor off in rainfall. Despite this decrease, the city records a significant amount of rain, amounting to an average of 135mm (5.31"). Weather in November »

Weather in December

December in Saint John's brings the mildest weather conditions of the year, as both the high and low temperatures decrease from November. A noticeable decline in rainfall to 83mm (3.27") signifies the end of the rainy season. Correspondingly, there is a decrease in the number of rainy days, implying drier conditions towards the end of the year. Weather in December »
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Frequently asked questions

What is the coldest time of year in Saint John's?

The coldest period in Saint John's is January, when temperatures fluctuate between an average high of 28.3°C (82.9°F) and a low of 22.4°C (72.3°F).

How much does it rain in Saint John's?

In Saint John's, during the entire year, the rain falls for 125.1 days and collects up to 1049mm (41.3") of precipitation.

What is the driest month in Saint John's?

February is the month with the least rainfall. Rain falls for 8.7 days and accumulates 45mm (1.77") of precipitation.

When are the longest days in Saint John's?

The month with the longest days in Saint John's, Antigua and Barbuda, is June, with an average of 13h and 6min of daylight.

What time of the year is the hottest in Saint John's?

Saint John's's temperatures tend to reach their peak averages in August, with a high of 31.2°C (88.2°F) and a low of 25.5°C (77.9°F).

What is the wettest month in Saint John's?

The month with the most rainfall in Saint John's is October, when the rain falls for 12.9 days and typically aggregates up to 142mm (5.59") of precipitation.

What is the month with the shortest days in Saint John's?

December has the shortest days of the year in Saint John's, with an average of 11h and 6min of daylight.

Is there Daylight Saving Time (DST) in Saint John's?

Saint John's does not utilize Daylight Saving Time (DST). AST timezone is used over the entire year.

Average temperature
Saint John's, Antigua and Barbuda

Average temperature - Saint John

The warmest month (with the highest average high temperature) is August (31.2°C).
The month with the lowest average high temperature is January (28.3°C).

The month with the highest average low temperature is August (25.5°C).
The coldest month (with the lowest average low temperature) is February (22.2°C).

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Average rainfall
Saint John's, Antigua and Barbuda

Average rainfall - Saint John

The wettest month (with the highest rainfall) is October (142.2mm).
The driest month (with the least rainfall) is February (44.9mm).

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Average rainfall days
Saint John's, Antigua and Barbuda

Average rainfall days - Saint John

The month with the highest number of rainy days is October (12.9 days).
The month with the least rainy days is April (7.2 days).

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Average daylight
Saint John's, Antigua and Barbuda

Average daylight - Saint John

The month with the longest days is June (Average daylight: 13h and 6min).
The month with the shortest days is December (Average daylight: 11h and 6min).

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Saint John's, Antigua and Barbuda

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