Portsmouth climate guide

Temperature in Portsmouth (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
7°C maximum daytime temperature in January in Portsmouth7
7°C maximum daytime temperature in February in Portsmouth7
10°C maximum daytime temperature in March in Portsmouth10
12°C maximum daytime temperature in April in Portsmouth12
16°C maximum daytime temperature in May in Portsmouth16
19°C maximum daytime temperature in June in Portsmouth19
21°C maximum daytime temperature in July in Portsmouth21
21°C maximum daytime temperature in August in Portsmouth21
18°C maximum daytime temperature in September in Portsmouth18
15°C maximum daytime temperature in October in Portsmouth15
11°C maximum daytime temperature in November in Portsmouth11
9°C maximum daytime temperature in December in Portsmouth9
Min temperature (night-time)
3°C minimum night-time temperature in January in Portsmouth3
3°C minimum night-time temperature in February in Portsmouth3
4°C minimum night-time temperature in March in Portsmouth4
5°C minimum night-time temperature in April in Portsmouth5
8°C minimum night-time temperature in May in Portsmouth8
12°C minimum night-time temperature in June in Portsmouth12
13°C minimum night-time temperature in July in Portsmouth13
14°C minimum night-time temperature in August in Portsmouth14
12°C minimum night-time temperature in September in Portsmouth12
10°C minimum night-time temperature in October in Portsmouth10
6°C minimum night-time temperature in November in Portsmouth6
4°C minimum night-time temperature in December in Portsmouth4
Sea temperature
8°C sea temperature in January in Portsmouth8
7°C sea temperature in February in Portsmouth7
7°C sea temperature in March in Portsmouth7
9°C sea temperature in April in Portsmouth9
12°C sea temperature in May in Portsmouth12
14°C sea temperature in June in Portsmouth14
17°C sea temperature in July in Portsmouth17
18°C sea temperature in August in Portsmouth18
17°C sea temperature in September in Portsmouth17
15°C sea temperature in October in Portsmouth15
12°C sea temperature in November in Portsmouth12
10°C sea temperature in December in Portsmouth10

Sunshine & Daylight in Portsmouth

  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 Portsmouth9
10 hours of daylight per day in February in Portsmouth10
12 hours of daylight per day in March in Portsmouth12
14 hours of daylight per day in April in Portsmouth14
16 hours of daylight per day in May in Portsmouth16
16 hours of daylight per day in June in Portsmouth16
16 hours of daylight per day in July in Portsmouth16
14 hours of daylight per day in August in Portsmouth14
13 hours of daylight per day in September in Portsmouth13
11 hours of daylight per day in October in Portsmouth11
9 hours of daylight per day in November in Portsmouth9
8 hours of daylight per day in December in Portsmouth8

Rainfall in Portsmouth

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Number of days with some rain
17 days with some rainfall in January in Portsmouth17
12 days with some rainfall in February in Portsmouth12
14 days with some rainfall in March in Portsmouth14
12 days with some rainfall in April in Portsmouth12
12 days with some rainfall in May in Portsmouth12
10 days with some rainfall in June in Portsmouth10
9 days with some rainfall in July in Portsmouth9
10 days with some rainfall in August in Portsmouth10
11 days with some rainfall in September in Portsmouth11
14 days with some rainfall in October in Portsmouth14
15 days with some rainfall in November in Portsmouth15
16 days with some rainfall in December in Portsmouth16
Average monthly rainfall (mm)
79 mm monthly rainfall in January in Portsmouth79
53 mm monthly rainfall in February in Portsmouth53
60 mm monthly rainfall in March in Portsmouth60
47 mm monthly rainfall in April in Portsmouth47
48 mm monthly rainfall in May in Portsmouth48
44 mm monthly rainfall in June in Portsmouth44
39 mm monthly rainfall in July in Portsmouth39
53 mm monthly rainfall in August in Portsmouth53
63 mm monthly rainfall in September in Portsmouth63
75 mm monthly rainfall in October in Portsmouth75
80 mm monthly rainfall in November in Portsmouth80
78 mm monthly rainfall in December in Portsmouth78

More climate for Portsmouth

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (Maximum)
UV (maximum) index 1 (Low) in January in Portsmouth1
UV (maximum) index 1 (Low) in February in Portsmouth1
UV (maximum) index 3 (Moderate) in March in Portsmouth3
UV (maximum) index 4 (Moderate) in April in Portsmouth4
UV (maximum) index 6 (High) in May in Portsmouth6
UV (maximum) index 6 (High) in June in Portsmouth6
UV (maximum) index 6 (High) in July in Portsmouth6
UV (maximum) index 6 (High) in August in Portsmouth6
UV (maximum) index 4 (Moderate) in September in Portsmouth4
UV (maximum) index 2 (Low) in October in Portsmouth2
UV (maximum) index 1 (Low) in November in Portsmouth1
UV (maximum) index 1 (Low) in December in Portsmouth1
Heat & Humidity
No heat & humidity in January in Portsmouth0
No heat & humidity in February in Portsmouth0
No heat & humidity in March in Portsmouth0
No heat & humidity in April in Portsmouth0
No heat & humidity in May in Portsmouth0
No heat & humidity in June in Portsmouth0
No heat & humidity in July in Portsmouth0
No heat & humidity in August in Portsmouth0
No heat & humidity in September in Portsmouth0
No heat & humidity in October in Portsmouth0
No heat & humidity in November in Portsmouth0
No heat & humidity in December in Portsmouth0

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

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Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

The climate guide for Portsmouth, UK 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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