Annual mean 18°C · wettest around February · prevailing wind SW
Warmest
30.8 °C
Coldest
10.1 °C
Wettest
37%
Windiest
3.8 m/s
Prevailing
SW
3.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Chelsea over the whole year is 18°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 4°C. Chelsea has no sharply defined rainy season: the chance of rain on a given day runs from 27% in October, the driest month, to 34% in February, the wettest. Winds in Chelsea are highest in February, averaging 2.6 m/s (9 km/h), and lightest in August, at 1.5 m/s (5 km/h). The prevailing wind is from the SW. The clearest skies in Chelsea come in October, when the sky is typically 27% covered; February is the cloudiest month, at 38%.
Month by month Chelsea 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
10°C
4°C
7°C
34%
35%
2.4 m/s
17
0
45
February
15°C
8°C
12°C
34%
38%
2.6 m/s
37
2
62
March
18°C
10°C
15°C
33%
35%
2.5 m/s
54
6
69
April
22°C
12°C
19°C
31%
30%
2.3 m/s
70
22
61
May
26°C
18°C
26°C
31%
33%
2.0 m/s
54
58
25
June
29°C
22°C
31°C
31%
34%
1.8 m/s
16
61
2
July
31°C
23°C
34°C
29%
33%
1.6 m/s
3
39
0
August
30°C
22°C
33°C
29%
34%
1.5 m/s
6
44
1
September
29°C
19°C
30°C
28%
29%
1.6 m/s
26
58
10
October
24°C
14°C
23°C
27%
27%
1.7 m/s
64
39
44
November
17°C
8°C
15°C
28%
28%
1.8 m/s
49
7
70
December
13°C
6°C
10°C
30%
38%
2.2 m/s
26
1
57
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 Chelsea weather by season
Year round, Chelsea has days of about 10°C at their warmest in January, its coolest month, and 31°C in July, its warmest; the coolest hours of the day run from 4°C to 23°C through the year, and the average temperature over the year is 18°C around the clock. Rain is most likely around February and least likely around October. 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.
Chelsea weather in winterDecember to February
High 13°CLow 6°CRain 33%
Winter in Chelsea has typical daily highs of about 13°C and lows of about 6°C, with a 33% chance of rain on a given day.
Chelsea weather in springMarch to May
High 22°CLow 13°CRain 31%
Spring in Chelsea has typical daily highs of about 22°C and lows of about 13°C, with a 31% chance of rain on a given day.
Chelsea weather in summerJune to August
High 30°CLow 22°CRain 30%
Summer in Chelsea has typical daily highs of about 30°C and lows of about 22°C, with a 30% chance of rain on a given day.
Chelsea weather in autumnSeptember to November
High 23°CLow 14°CRain 28%
Autumn in Chelsea has typical daily highs of about 23°C and lows of about 14°C, with a 28% chance of rain on a given day.
When is the rainy season in Chelsea?
Chelsea has no sharply defined rainy season: the chance of rain on a given day runs from 27% in October, the driest month, to 34% in February, the wettest.
What time of year is Chelsea windiest?
Winds in Chelsea are highest in February, averaging 2.6 m/s (9 km/h), and lightest in August, at 1.5 m/s (5 km/h). The prevailing wind is from the SW.
What is the average temperature in Chelsea year round?
The average temperature in Chelsea over the whole year is 18°C. July is the hottest month, with highs of about 31°C; January is the coldest, with lows of about 4°C.