Climate · Castries

Castries in September

Hot and wet, as the days shorten.

Typical weather, averaged over 30 years

September in Castries is hot: highs near 89°F, lows near 78°F. Rain falls on about five days a week, and the days shorten by 17 minutes from the first week to the last.September in Castries is hot: highs near 32°C, lows near 26°C. Rain falls on about five days a week, and the days shorten by 17 minutes from the first week to the last.

High
89°F32°Caverage
Low
78°F26°Caverage
Wet days
5a week · 78% of days
Daylight
12h 11mon average

Is September a good time to visit Castries?


A good month, just outside Castries's most comfortable months, which run from December to March.

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 89°F in September, against 85°F to 89°F through the year.Highs near 32°C in September, against 29°C to 32°C through the year.

Chance of a wet day

78% of days in September, against 48% to 84% through the year.

Cloud cover

68% cover in September, against 45% to 69% through the year.

Daylight

12h 11m in September, against 11h 19m to 12h 56m through the year.

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

Either side


  1. August89°32°low 78°low 26°6 wet days a weekRain on about six days a week.
  2. September89°32°low 78°low 26°5 wet days a weekRain on about five days a week.
  3. October88°31°low 78°low 26°6 wet days a weekRain on about six days a week.

Where Castries sits, in September

America/St Vincent

this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
5:53 AMsets 6:06 PM
Above the sea
0 mlow-lying
Latitude
14.0°Nnorthern hemisphere
Nearest of ours
our one place here

The land around Castries, 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. Castries is our one place in St Lucia so far. Clock times are local, for the 15th.

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Castries. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (97 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (0 m) against the climate model's (97 m). 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.