Guernsey climate guide

Temperature in Guernsey (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
9°C maximum daytime temperature in January in Guernsey (St Peter Port)9
8°C maximum daytime temperature in February in Guernsey (St Peter Port)8
10°C maximum daytime temperature in March in Guernsey (St Peter Port)10
12°C maximum daytime temperature in April in Guernsey (St Peter Port)12
15°C maximum daytime temperature in May in Guernsey (St Peter Port)15
17°C maximum daytime temperature in June in Guernsey (St Peter Port)17
19°C maximum daytime temperature in July in Guernsey (St Peter Port)19
20°C maximum daytime temperature in August in Guernsey (St Peter Port)20
18°C maximum daytime temperature in September in Guernsey (St Peter Port)18
15°C maximum daytime temperature in October in Guernsey (St Peter Port)15
12°C maximum daytime temperature in November in Guernsey (St Peter Port)12
10°C maximum daytime temperature in December in Guernsey (St Peter Port)10
Min temperature (night-time)
5°C minimum night-time temperature in January in Guernsey (St Peter Port)5
4°C minimum night-time temperature in February in Guernsey (St Peter Port)4
5°C minimum night-time temperature in March in Guernsey (St Peter Port)5
6°C minimum night-time temperature in April in Guernsey (St Peter Port)6
9°C minimum night-time temperature in May in Guernsey (St Peter Port)9
11°C minimum night-time temperature in June in Guernsey (St Peter Port)11
13°C minimum night-time temperature in July in Guernsey (St Peter Port)13
14°C minimum night-time temperature in August in Guernsey (St Peter Port)14
13°C minimum night-time temperature in September in Guernsey (St Peter Port)13
11°C minimum night-time temperature in October in Guernsey (St Peter Port)11
7°C minimum night-time temperature in November in Guernsey (St Peter Port)7
6°C minimum night-time temperature in December in Guernsey (St Peter Port)6
Sea temperature
10°C sea temperature in January in Guernsey (St Peter Port)10
9°C sea temperature in February in Guernsey (St Peter Port)9
9°C sea temperature in March in Guernsey (St Peter Port)9
10°C sea temperature in April in Guernsey (St Peter Port)10
11°C sea temperature in May in Guernsey (St Peter Port)11
13°C sea temperature in June in Guernsey (St Peter Port)13
15°C sea temperature in July in Guernsey (St Peter Port)15
17°C sea temperature in August in Guernsey (St Peter Port)17
17°C sea temperature in September in Guernsey (St Peter Port)17
16°C sea temperature in October in Guernsey (St Peter Port)16
14°C sea temperature in November in Guernsey (St Peter Port)14
12°C sea temperature in December in Guernsey (St Peter Port)12

Sunshine & Daylight in Guernsey

  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 Guernsey (St Peter Port)9
10 hours of daylight per day in February in Guernsey (St Peter Port)10
12 hours of daylight per day in March in Guernsey (St Peter Port)12
14 hours of daylight per day in April in Guernsey (St Peter Port)14
15 hours of daylight per day in May in Guernsey (St Peter Port)15
16 hours of daylight per day in June in Guernsey (St Peter Port)16
16 hours of daylight per day in July in Guernsey (St Peter Port)16
14 hours of daylight per day in August in Guernsey (St Peter Port)14
13 hours of daylight per day in September in Guernsey (St Peter Port)13
11 hours of daylight per day in October in Guernsey (St Peter Port)11
9 hours of daylight per day in November in Guernsey (St Peter Port)9
8 hours of daylight per day in December in Guernsey (St Peter Port)8

Rainfall in Guernsey

  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 Guernsey (St Peter Port)20
16 days with some rainfall in February in Guernsey (St Peter Port)16
16 days with some rainfall in March in Guernsey (St Peter Port)16
13 days with some rainfall in April in Guernsey (St Peter Port)13
13 days with some rainfall in May in Guernsey (St Peter Port)13
11 days with some rainfall in June in Guernsey (St Peter Port)11
10 days with some rainfall in July in Guernsey (St Peter Port)10
11 days with some rainfall in August in Guernsey (St Peter Port)11
13 days with some rainfall in September in Guernsey (St Peter Port)13
15 days with some rainfall in October in Guernsey (St Peter Port)15
18 days with some rainfall in November in Guernsey (St Peter Port)18
19 days with some rainfall in December in Guernsey (St Peter Port)19
Average monthly rainfall (mm)
92 mm monthly rainfall in January in Guernsey (St Peter Port)92
75 mm monthly rainfall in February in Guernsey (St Peter Port)75
67 mm monthly rainfall in March in Guernsey (St Peter Port)67
49 mm monthly rainfall in April in Guernsey (St Peter Port)49
48 mm monthly rainfall in May in Guernsey (St Peter Port)48
44 mm monthly rainfall in June in Guernsey (St Peter Port)44
37 mm monthly rainfall in July in Guernsey (St Peter Port)37
45 mm monthly rainfall in August in Guernsey (St Peter Port)45
63 mm monthly rainfall in September in Guernsey (St Peter Port)63
81 mm monthly rainfall in October in Guernsey (St Peter Port)81
98 mm monthly rainfall in November in Guernsey (St Peter Port)98
100 mm monthly rainfall in December in Guernsey (St Peter Port)100

More climate for Guernsey

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Guernsey (St Peter Port)1
UV (maximum) index 2 (Low) in February in Guernsey (St Peter Port)2
UV (maximum) index 3 (Moderate) in March in Guernsey (St Peter Port)3
UV (maximum) index 4 (Moderate) in April in Guernsey (St Peter Port)4
UV (maximum) index 6 (High) in May in Guernsey (St Peter Port)6
UV (maximum) index 7 (High) in June in Guernsey (St Peter Port)7
UV (maximum) index 7 (High) in July in Guernsey (St Peter Port)7
UV (maximum) index 6 (High) in August in Guernsey (St Peter Port)6
UV (maximum) index 4 (Moderate) in September in Guernsey (St Peter Port)4
UV (maximum) index 2 (Low) in October in Guernsey (St Peter Port)2
UV (maximum) index 1 (Low) in November in Guernsey (St Peter Port)1
UV (maximum) index 1 (Low) in December in Guernsey (St Peter Port)1
Heat & Humidity
No heat & humidity in January in Guernsey (St Peter Port)0
No heat & humidity in February in Guernsey (St Peter Port)0
No heat & humidity in March in Guernsey (St Peter Port)0
No heat & humidity in April in Guernsey (St Peter Port)0
No heat & humidity in May in Guernsey (St Peter Port)0
No heat & humidity in June in Guernsey (St Peter Port)0
No heat & humidity in July in Guernsey (St Peter Port)0
No heat & humidity in August in Guernsey (St Peter Port)0
No heat & humidity in September in Guernsey (St Peter Port)0
No heat & humidity in October in Guernsey (St Peter Port)0
No heat & humidity in November in Guernsey (St Peter Port)0
No heat & humidity in December in Guernsey (St Peter Port)0

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

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The climate guide for Guernsey 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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