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Climate · St. John's

St. John's in September

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

September in St. John's is hot: highs near 87°F, lows near 80°F. Rain falls on about five days a week, and the days shorten by 21 minutes from the first week to the last.September in St. John's is hot: highs near 31°C, lows near 27°C. Rain falls on about five days a week, and the days shorten by 21 minutes from the first week to the last.

High
87°F31°Caverage
Low
80°F27°Caverage
Wet days
5a week · 70% of days
Daylight
12h 12mon average

Is September a good time to visit St. John's?

September sits outside St. John's's best months, which run from January to April. Expect hot days and rain on about five days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 87°F in September, against 82°F to 87°F through the year.Highs near 31°C in September, against 28°C to 31°C through the year.

Chance of a wet day

70% of days in September, against 37% to 73% through the year.

Cloud cover

66% cover in September, against 28% to 66% through the year.

Daylight

12h 12m in September, against 11h 07m to 13h 08m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August87°31°low 80°low 27°5 wet days a weekRain on about five days a week.
  2. September87°31°low 80°low 27°5 wet days a weekRain on about five days a week.
  3. October86°30°low 79°low 26°5 wet days a weekRain on about five days a week.

Where St. John's sits, in September

America/Antigua
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
5:55 AMsets 6:10 PM
Above the sea
0 mlow-lying
Latitude
17.1°Nnorthern hemisphere
Nearest of ours
our one place here

The land around St. John's, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. St. John's is our one place in Antigua & Barbuda so far. Clock times are local, for the 15th.

See September on the planning mapThe whole year in St. John's

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest St. John's. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.