Annual mean 12°C · wettest around December · prevailing wind SW
Warmest
20.3 °C
Coldest
7.6 °C
Wettest
36%
Windiest
7.6 m/s
Prevailing
SW
6.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Saint Helier over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 7°C. The rainy (wet) season in Saint Helier runs from October to March, peaking in December with a 28% chance of rain on a given day. The dry season is April to September; July is the driest month, at 9%. Winds in Saint Helier are highest in December, averaging 6.5 m/s (23 km/h), and lightest in June, at 4.3 m/s (15 km/h). The prevailing wind is from the SW. The clearest skies in Saint Helier come in April, when the sky is typically 60% covered; December is the cloudiest month, at 77%.
Month by month Saint Helier 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
8°C
7°C
2°C
24%
76%
6.0 m/s
0
0
15
February
9°C
7°C
3°C
21%
72%
6.2 m/s
0
0
21
March
10°C
7°C
4°C
19%
70%
5.8 m/s
1
0
33
April
12°C
9°C
7°C
13%
60%
4.8 m/s
7
0
55
May
15°C
11°C
11°C
11%
61%
4.6 m/s
21
0
80
June
18°C
14°C
15°C
13%
65%
4.3 m/s
52
3
84
July
20°C
16°C
17°C
9%
62%
4.4 m/s
75
5
84
August
20°C
16°C
17°C
12%
63%
4.4 m/s
75
5
81
September
18°C
15°C
15°C
14%
67%
4.8 m/s
56
3
81
October
15°C
13°C
11°C
26%
69%
5.4 m/s
21
0
76
November
12°C
10°C
6°C
27%
74%
6.1 m/s
1
0
45
December
9°C
8°C
4°C
28%
77%
6.5 m/s
0
0
26
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 Saint Helier weather by season
Year round, Saint Helier has days of about 8°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 7°C to 16°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around December and least likely around July. 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.
Saint Helier weather in winterDecember to February
High 9°CLow 7°CRain 24%
Winter in Saint Helier has typical daily highs of about 9°C and lows of about 7°C, with a 24% chance of rain on a given day.
Saint Helier weather in springMarch to May
High 12°CLow 9°CRain 14%
Spring in Saint Helier has typical daily highs of about 12°C and lows of about 9°C, with a 14% chance of rain on a given day.
Saint Helier weather in summerJune to August
High 19°CLow 15°CRain 11%
Summer in Saint Helier has typical daily highs of about 19°C and lows of about 15°C, with a 11% chance of rain on a given day.
Saint Helier weather in autumnSeptember to November
High 15°CLow 12°CRain 22%
Autumn in Saint Helier has typical daily highs of about 15°C and lows of about 12°C, with a 22% chance of rain on a given day.
When is the rainy season in Saint Helier?
The rainy (wet) season in Saint Helier runs from October to March, peaking in December with a 28% chance of rain on a given day. The dry season is April to September; July is the driest month, at 9%.
What time of year is Saint Helier windiest?
Winds in Saint Helier are highest in December, averaging 6.5 m/s (23 km/h), and lightest in June, at 4.3 m/s (15 km/h). The prevailing wind is from the SW.
What is the average temperature in Saint Helier year round?
The average temperature in Saint Helier over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 7°C.