Weather and climate in St Johns (Antigua and Barbuda)

In St. John's, the capital of Antigua and Barbuda, there is a tropical climate (in the Köppen classification: tropical savanna climate - Aw), hot and humid all year round, with a relatively cool, dry season from January to mid-April and a hot, humid, and rainy season from mid-June to mid-November.
The city is located in the northwest of the small Caribbean island, on the coast, at 17 degrees north latitude. The V. C. Bird International Airport, from which the weather data is taken, is located a short distance away, on the northeast-facing coast.
Temperatures vary slightly throughout the year, however, from January to mid-March, the night-time minimum can sometimes drop to 18/19 °C (64/66 °F), while from August to October, in the hottest period, the maximum can sometimes reach 33/34 °C (91/93 °F). In August 1995 it reached 34.9 °C (94.8 °F).

St Johns - Climate data

The average temperature of the coldest months (January, February) is of 25.4 °C (77.7 °F), that of the warmest month (August) is of 28.4 °C (83.0 °F). Here are the average temperatures.
Precipitation amounts to 1000 millimeters (39.4 inches) per year: so, it is at an intermediate level. It ranges from 38 mm (1.5 in) in the driest month (March) to 135 mm (5.3 in) in the wettest one (November). Here is the average precipitation.
The sea temperature ranges from 26 °C (79 °F) in February, March to 29 °C (84 °F) in September. Here are the average sea temperatures.
There are on average around 2955 sunshine hours per year. Here are the average hours of sunshine per day.

St Johns - Weather by month

Based on the period 1991-2020

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January, the least warm month of the year, is generally a warm to hot, muggy month. The average temperature is of 25.4 °C (78 °F), with a minimum of 22.6 °C (72.7 °F) and a maximum of 28.2 °C (82.8 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68.5 °F).
On the warmest days of the month, the temperature usually reaches around 29.5 °C (85 °F).
Precipitation amounts to 55 mm (2.2 in), distributed over 11 days.
The day lasts on average 11 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 72% of the time.
The average humidity is 75%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 26.5 °C (79.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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February, the least warm month of the year, is generally a warm to hot, muggy month. The average temperature is of 25.4 °C (78 °F), with a minimum of 22.5 °C (72.5 °F) and a maximum of 28.3 °C (82.9 °F).
On the coldest nights of the month, the temperature usually drops to around 20 °C (68 °F).
On the warmest days of the month, the temperature usually reaches around 29.5 °C (85.5 °F).
Precipitation amounts to 39 mm (1.5 in), distributed over 8 days.
The day lasts on average 11 hours and 35 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 69% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 26 °C (79 °F). Therefore, the sea is warm enough for swimming.

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March is generally a warm to hot, muggy month. The average temperature is of 25.8 °C (78 °F), with a minimum of 22.9 °C (73.2 °F) and a maximum of 28.7 °C (83.7 °F).
On the coldest nights, the temperature usually drops to around 20 °C (68.5 °F).
On the warmest days, the temperature usually reaches around 30 °C (86 °F).
Precipitation amounts to 38 mm (1.5 in), distributed over 7 days.
The day lasts on average 12 hours and 5 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 73%. Hence, the air is normally humid.
The average wind speed is 20 kph (13 mph).
The average sea temperature is of 26 °C (79 °F). Therefore, the sea is warm enough for swimming.

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April is generally a warm to hot, muggy month. The average temperature is of 26.5 °C (80 °F), with a minimum of 23.6 °C (74.5 °F) and a maximum of 29.4 °C (84.9 °F).
On the coldest nights, the temperature usually drops to around 21 °C (69.5 °F).
On the warmest days, the temperature usually reaches around 31 °C (87.5 °F).
Precipitation amounts to 67 mm (2.6 in), distributed over 8 days.
The day lasts on average 12 hours and 30 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 74%. Hence, the air is normally humid.
The average wind speed is 20 kph (12 mph).
The average sea temperature is of 26.5 °C (80 °F). Therefore, the sea is pleasantly warm and allows long swims.

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May is generally a warm to hot, muggy month. The average temperature is of 27.3 °C (81 °F), with a minimum of 24.5 °C (76.1 °F) and a maximum of 30.1 °C (86.2 °F).
On the coldest nights, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 90 mm (3.5 in), distributed over 9 days.
The day lasts on average 12 hours and 55 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 27.5 °C (81.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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June is generally a very hot, muggy month. The average temperature is of 28.0 °C (82 °F), with a minimum of 25.3 °C (77.5 °F) and a maximum of 30.6 °C (87.1 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 31.5 °C (88.5 °F).
Precipitation amounts to 63 mm (2.5 in), distributed over 9 days.
The day lasts on average 13 hours and 5 minutes. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 8.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 22 kph (14 mph).
The average sea temperature is of 28 °C (82.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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July is generally a very hot, muggy month. The average temperature is of 28.1 °C (83 °F), with a minimum of 25.4 °C (77.7 °F) and a maximum of 30.8 °C (87.4 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days of the month, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 81 mm (3.2 in), distributed over 12 days.
The day lasts on average 13 hours and 0 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 23 kph (14 mph).
The average sea temperature is of 28 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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August, the hottest month of the year, is generally a very hot, muggy month. The average temperature is of 28.4 °C (83 °F), with a minimum of 25.6 °C (78.1 °F) and a maximum of 31.1 °C (88 °F).
On the coldest nights of the month, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days of the month, the temperature usually reaches around 32 °C (90 °F).
Precipitation amounts to 100 mm (3.9 in), distributed over 12 days.
The day lasts on average 12 hours and 40 minutes.
There are on average 8.5 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 77%. Hence, the air is normally humid.
The average wind speed is 21 kph (13 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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September is generally a very hot, muggy month. The average temperature is of 28.2 °C (83 °F), with a minimum of 25.2 °C (77.4 °F) and a maximum of 31.1 °C (88 °F).
On the coldest nights, the temperature usually drops to around 22.5 °C (72.5 °F).
On the warmest days, the temperature usually reaches around 32.5 °C (91 °F).
Precipitation amounts to 126 mm (5 in), distributed over 13 days.
The day lasts on average 12 hours and 10 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 16 kph (10 mph).
The average sea temperature is of 29 °C (84 °F). Therefore, the sea is pleasantly warm and allows long swims.

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October is generally a very hot, muggy month. The average temperature is of 27.6 °C (82 °F), with a minimum of 24.6 °C (76.3 °F) and a maximum of 30.6 °C (87.1 °F).
On the coldest nights, the temperature usually drops to around 22 °C (72 °F).
On the warmest days, the temperature usually reaches around 32.5 °C (90 °F).
Precipitation amounts to 128 mm (5 in), distributed over 12 days.
The day lasts on average 11 hours and 40 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 15 kph (10 mph).
The average sea temperature is of 28.5 °C (83.5 °F). Therefore, the sea is pleasantly warm and allows long swims.

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November is generally a warm to hot, muggy month. The average temperature is of 27.0 °C (81 °F), with a minimum of 24.1 °C (75.4 °F) and a maximum of 29.8 °C (85.6 °F).
On the coldest nights, the temperature usually drops to around 21.5 °C (71 °F).
On the warmest days, the temperature usually reaches around 31.5 °C (89 °F).
Precipitation amounts to 135 mm (5.3 in), distributed over 13 days.
The day lasts on average 11 hours and 20 minutes.
There are on average 7.5 hours of sunshine per day. So, the sun shines 67% of the time.
The average humidity is 78%. Hence, the air is normally humid.
The average wind speed is 17 kph (11 mph).
The average sea temperature is of 28 °C (83 °F). Therefore, the sea is pleasantly warm and allows long swims.

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December is generally a warm to hot, muggy month. The average temperature is of 26.1 °C (79 °F), with a minimum of 23.4 °C (74.1 °F) and a maximum of 28.8 °C (83.8 °F).
On the coldest nights of the month, the temperature usually drops to around 20.5 °C (68.5 °F).
On the warmest days of the month, the temperature usually reaches around 30.5 °C (86.5 °F).
Precipitation amounts to 81 mm (3.2 in), distributed over 12 days.
The day lasts on average 11 hours and 5 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 7.5 hours of sunshine per day. So, the sun shines 68% of the time.
The average humidity is 76%. Hence, the air is normally humid.
The average wind speed is 19 kph (12 mph).
The average sea temperature is of 27.5 °C (81 °F). Therefore, the sea is pleasantly warm and allows long swims.