Saint Johns climate
Saint Johns (Antigua and Barbuda) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 27 °C81 °F, and about 1,108 mm44 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Saint Johns climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2679 | 2578 | 2679 | 411.6 |
| Feb | 2679 | 2577 | 2678 | 291.1 |
| Mar | 2679 | 2577 | 2678 | 351.4 |
| Apr | 2781 | 2678 | 2679 | 522.0 |
| May | 2882 | 2780 | 2781 | 913.6 |
| Jun | 2883 | 2781 | 2882 | 923.6 |
| Jul | 2883 | 2882 | 2882 | 1144.5 |
| Aug | 2984 | 2882 | 2883 | 1355.3 |
| Sep | 2984 | 2882 | 2883 | 1435.6 |
| Oct | 2984 | 2882 | 2883 | 1766.9 |
| Nov | 2882 | 2781 | 2781 | 1325.2 |
| Dec | 2781 | 2679 | 2780 | 702.7 |
| Year | 2984 | 2577 | 2781 | 1,10844 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 76% | 36% | 4.9 | 11:12 |
| Feb | 75% | 36% | 5.6 | 11:34 |
| Mar | 75% | 38% | 6.4 | 12:00 |
| Apr | 76% | 44% | 6.7 | 12:30 |
| May | 78% | 55% | 6.4 | 12:56 |
| Jun | 78% | 55% | 6.4 | 13:09 |
| Jul | 78% | 47% | 6.4 | 13:03 |
| Aug | 79% | 45% | 6.4 | 12:42 |
| Sep | 79% | 53% | 6.0 | 12:12 |
| Oct | 79% | 51% | 5.3 | 11:43 |
| Nov | 78% | 46% | 4.8 | 11:18 |
| Dec | 77% | 40% | 4.6 | 11:07 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Saint Johns is like
The warmest month is September, with an average high of 29 °C84 °F and a low of 28 °C82 °F. The coldest is February, when highs average 26 °C79 °F and lows 25 °C77 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 2.8 °C5.1 °F.
It is wet, with about 1,108 mm44 in of precipitation per year. The wettest three-month stretch is August–October, which brings 41% of the annual total. The wettest month is October (176 mm6.9 in), the driest is February (29 mm1.1 in).
Relative humidity ranges from 75% in February to 79% in October. The clearest skies (lowest average cloud amount, 36%) are typical of February. Average wind speed near the ground ranges from 17 km/h (11 mph) in September to 23 km/h (14 mph) in July. Daylight lasts from about 11.1 hours in December to 13.1 hours in June.
Best time to visit Saint Johns
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–April: average highs of 26 °C79 °F to 27 °C81 °F with 29 mm1.1 in to 70 mm2.7 in of precipitation per month.
The most challenging month is October, which is very wet (176 mm6.9 in) and humid (79% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Saint Johns
- Wetter months (July–November) — highs 2882 to 29 °C84 °F, lows 2781 to 28 °C82 °F, about 140 mm5.5 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and an umbrella or light rain jacket.
- Drier months (December–June) — highs 2679 to 28 °C83 °F, lows 2577 to 27 °C81 °F, about 58 mm2.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Saint Johns compares
Compared with Fort-de-France, about 292 km to the south, Saint Johns is on average 0.4 °C0.7 °F cooler and receives 25% less precipitation (1,108 mm44 in vs 1,478 mm58 in). The difference is largest in March (0.6 °C1.1 °F cooler).
Places in other countries with the most similar temperature and rainfall pattern: Basse-Terre (Guadeloupe, Aw), Plymouth (Montserrat, Aw) and Charlotte Amalie (U.S. Virgin Islands, Aw).
Nearby places
- Plymouth 61 km · 27 °C80 °F · 1,003 mm39 in
- Basseterre 96 km · 27 °C81 °F · 792 mm31 in
- Basse-Terre 126 km · 27 °C81 °F · 1,171 mm46 in
- Gustavia 137 km · 27 °C81 °F · 614 mm24 in
- Marigot 168 km · 27 °C81 °F · 614 mm24 in
- Roseau 208 km · 27 °C81 °F · 1,419 mm56 in
- Fort-de-France 292 km · 27 °C81 °F · 1,478 mm58 in
- Road Town 328 km · 27 °C81 °F · 646 mm25 in
Frequently asked questions
What is the warmest month in Saint Johns?
September is the warmest month in Saint Johns, with an average high of 29 °C (84 °F) and an average low of 28 °C (82 °F).
What is the coldest month in Saint Johns?
February is the coldest month, with an average high of 26 °C (79 °F) and an average low of 25 °C (77 °F).
When does it rain the most in Saint Johns?
October is the wettest month with about 176 mm (6.9 in) of precipitation; February is the driest with about 29 mm (1.1 in).
What is the best time to visit Saint Johns?
Judging by long-term averages, the most comfortable months are December–April.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.