St Helier climate guide

Temperature in St Helier (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
8°C maximum daytime temperature in January in St Helier8
8°C maximum daytime temperature in February in St Helier8
10°C maximum daytime temperature in March in St Helier10
12°C maximum daytime temperature in April in St Helier12
16°C maximum daytime temperature in May in St Helier16
18°C maximum daytime temperature in June in St Helier18
20°C maximum daytime temperature in July in St Helier20
20°C maximum daytime temperature in August in St Helier20
19°C maximum daytime temperature in September in St Helier19
16°C maximum daytime temperature in October in St Helier16
12°C maximum daytime temperature in November in St Helier12
9°C maximum daytime temperature in December in St Helier9
Min temperature (night-time)
4°C minimum night-time temperature in January in St Helier4
4°C minimum night-time temperature in February in St Helier4
5°C minimum night-time temperature in March in St Helier5
6°C minimum night-time temperature in April in St Helier6
9°C minimum night-time temperature in May in St Helier9
12°C minimum night-time temperature in June in St Helier12
14°C minimum night-time temperature in July in St Helier14
14°C minimum night-time temperature in August in St Helier14
13°C minimum night-time temperature in September in St Helier13
11°C minimum night-time temperature in October in St Helier11
7°C minimum night-time temperature in November in St Helier7
5°C minimum night-time temperature in December in St Helier5
Sea temperature
9°C sea temperature in January in St Helier9
8°C sea temperature in February in St Helier8
8°C sea temperature in March in St Helier8
10°C sea temperature in April in St Helier10
12°C sea temperature in May in St Helier12
14°C sea temperature in June in St Helier14
17°C sea temperature in July in St Helier17
18°C sea temperature in August in St Helier18
17°C sea temperature in September in St Helier17
16°C sea temperature in October in St Helier16
13°C sea temperature in November in St Helier13
11°C sea temperature in December in St Helier11

Sunshine & Daylight in St Helier

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
9 hours of daylight per day in January in St Helier9
10 hours of daylight per day in February in St Helier10
12 hours of daylight per day in March in St Helier12
14 hours of daylight per day in April in St Helier14
15 hours of daylight per day in May in St Helier15
16 hours of daylight per day in June in St Helier16
16 hours of daylight per day in July in St Helier16
14 hours of daylight per day in August in St Helier14
13 hours of daylight per day in September in St Helier13
11 hours of daylight per day in October in St Helier11
9 hours of daylight per day in November in St Helier9
8 hours of daylight per day in December in St Helier8

Rainfall in St Helier

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
20 days with some rainfall in January in St Helier20
16 days with some rainfall in February in St Helier16
16 days with some rainfall in March in St Helier16
14 days with some rainfall in April in St Helier14
13 days with some rainfall in May in St Helier13
11 days with some rainfall in June in St Helier11
10 days with some rainfall in July in St Helier10
11 days with some rainfall in August in St Helier11
13 days with some rainfall in September in St Helier13
15 days with some rainfall in October in St Helier15
19 days with some rainfall in November in St Helier19
19 days with some rainfall in December in St Helier19
Average monthly rainfall (mm)
102 mm monthly rainfall in January in St Helier102
77 mm monthly rainfall in February in St Helier77
76 mm monthly rainfall in March in St Helier76
55 mm monthly rainfall in April in St Helier55
56 mm monthly rainfall in May in St Helier56
48 mm monthly rainfall in June in St Helier48
42 mm monthly rainfall in July in St Helier42
52 mm monthly rainfall in August in St Helier52
75 mm monthly rainfall in September in St Helier75
91 mm monthly rainfall in October in St Helier91
115 mm monthly rainfall in November in St Helier115
112 mm monthly rainfall in December in St Helier112

More climate for St Helier

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in St Helier1
UV (maximum) index 2 (Low) in February in St Helier2
UV (maximum) index 3 (Moderate) in March in St Helier3
UV (maximum) index 4 (Moderate) in April in St Helier4
UV (maximum) index 6 (High) in May in St Helier6
UV (maximum) index 7 (High) in June in St Helier7
UV (maximum) index 7 (High) in July in St Helier7
UV (maximum) index 6 (High) in August in St Helier6
UV (maximum) index 4 (Moderate) in September in St Helier4
UV (maximum) index 2 (Low) in October in St Helier2
UV (maximum) index 1 (Low) in November in St Helier1
UV (maximum) index 1 (Low) in December in St Helier1
Heat & Humidity
No heat & humidity in January in St Helier0
No heat & humidity in February in St Helier0
No heat & humidity in March in St Helier0
No heat & humidity in April in St Helier0
No heat & humidity in May in St Helier0
No heat & humidity in June in St Helier0
No heat & humidity in July in St Helier0
No heat & humidity in August in St Helier0
No heat & humidity in September in St Helier0
No heat & humidity in October in St Helier0
No heat & humidity in November in St Helier0
No heat & humidity in December in St Helier0

Note: 0 = None, L = Low, M = Moderate, H = High, VH = Very high, E = Extreme

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The climate guide for St Helier, Jersey shows long term monthly weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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Metric (°C / mm)  |  Imperial (°F / inches)

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