Annual mean 10°C · wettest around December · prevailing wind W
Warmest
25.6 °C
Coldest
-3.0 °C
Wettest
27%
Windiest
4.0 m/s
Prevailing
W
3.3 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in St. Thomas over the whole year is 10°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -4°C. St. Thomas has no sharply defined rainy season: the chance of rain on a given day runs from 15% in September, the driest month, to 27% in December, the wettest. Winds in St. Thomas are highest in January, averaging 3.1 m/s (11 km/h), and lightest in July, at 2.0 m/s (7 km/h). The prevailing wind is from the W. The clearest skies in St. Thomas come in July, when the sky is typically 40% covered; December is the cloudiest month, at 69%.
Month by month St. Thomas climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-2°C
-4°C
-8°C
26%
67%
3.1 m/s
0
0
1
February
-1°C
-4°C
-6°C
23%
61%
3.1 m/s
0
0
5
March
4°C
-0°C
-1°C
22%
54%
3.1 m/s
2
0
14
April
10°C
4°C
5°C
23%
52%
3.0 m/s
11
0
38
May
17°C
10°C
14°C
19%
46%
2.6 m/s
42
10
63
June
22°C
16°C
22°C
16%
43%
2.4 m/s
69
29
54
July
25°C
19°C
26°C
15%
40%
2.0 m/s
60
56
27
August
24°C
17°C
25°C
16%
41%
2.0 m/s
66
51
32
September
21°C
14°C
21°C
15%
41%
2.1 m/s
70
25
60
October
14°C
9°C
12°C
23%
49%
2.6 m/s
34
4
61
November
6°C
3°C
2°C
24%
58%
2.9 m/s
5
0
23
December
1°C
-1°C
-4°C
27%
69%
3.1 m/s
0
0
4
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short St. Thomas weather by season
Year round, St. Thomas has days of about -2°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from -4°C to 19°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around December and least likely around September. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
St. Thomas weather in winterDecember to February
High -1°CLow -3°CRain 25%
Winter in St. Thomas has typical daily highs of about -1°C and lows of about -3°C, with a 25% chance of rain on a given day.
St. Thomas weather in springMarch to May
High 10°CLow 5°CRain 21%
Spring in St. Thomas has typical daily highs of about 10°C and lows of about 5°C, with a 21% chance of rain on a given day.
St. Thomas weather in summerJune to August
High 24°CLow 17°CRain 16%
Summer in St. Thomas has typical daily highs of about 24°C and lows of about 17°C, with a 16% chance of rain on a given day.
St. Thomas weather in autumnSeptember to November
High 14°CLow 9°CRain 20%
Autumn in St. Thomas has typical daily highs of about 14°C and lows of about 9°C, with a 20% chance of rain on a given day.
When is the rainy season in St. Thomas?
St. Thomas has no sharply defined rainy season: the chance of rain on a given day runs from 15% in September, the driest month, to 27% in December, the wettest.
What time of year is St. Thomas windiest?
Winds in St. Thomas are highest in January, averaging 3.1 m/s (11 km/h), and lightest in July, at 2.0 m/s (7 km/h). The prevailing wind is from the W.
What is the average temperature in St. Thomas year round?
The average temperature in St. Thomas over the whole year is 10°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -4°C.