Portsmouth weather by month

Check out Portsmouth weather averages by month. Compare detailed monthly climate statistics including temperature, rainfall and sunshine figures.

Temperature in Portsmouth (°C)

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Max temperature (daytime)
28°C maximum daytime temperature in January in Portsmouth28
29°C maximum daytime temperature in February in Portsmouth29
29°C maximum daytime temperature in March in Portsmouth29
30°C maximum daytime temperature in April in Portsmouth30
30°C maximum daytime temperature in May in Portsmouth30
31°C maximum daytime temperature in June in Portsmouth31
31°C maximum daytime temperature in July in Portsmouth31
31°C maximum daytime temperature in August in Portsmouth31
31°C maximum daytime temperature in September in Portsmouth31
30°C maximum daytime temperature in October in Portsmouth30
30°C maximum daytime temperature in November in Portsmouth30
29°C maximum daytime temperature in December in Portsmouth29
Min temperature (night-time)
21°C minimum night-time temperature in January in Portsmouth21
21°C minimum night-time temperature in February in Portsmouth21
21°C minimum night-time temperature in March in Portsmouth21
22°C minimum night-time temperature in April in Portsmouth22
23°C minimum night-time temperature in May in Portsmouth23
23°C minimum night-time temperature in June in Portsmouth23
24°C minimum night-time temperature in July in Portsmouth24
24°C minimum night-time temperature in August in Portsmouth24
24°C minimum night-time temperature in September in Portsmouth24
23°C minimum night-time temperature in October in Portsmouth23
22°C minimum night-time temperature in November in Portsmouth22
22°C minimum night-time temperature in December in Portsmouth22
Heat & Humidity
Moderate heat & humidity in January in PortsmouthM
Moderate heat & humidity in February in PortsmouthM
Moderate heat & humidity in March in PortsmouthM
High heat & humidity in April in PortsmouthH
High heat & humidity in May in PortsmouthH
High heat & humidity in June in PortsmouthH
High heat & humidity in July in PortsmouthH
High heat & humidity in August in PortsmouthH
High heat & humidity in September in PortsmouthH
High heat & humidity in October in PortsmouthH
High heat & humidity in November in PortsmouthH
Moderate heat & humidity in December in PortsmouthM
Sea temperature
27°C sea temperature in January in Portsmouth27
26°C sea temperature in February in Portsmouth26
26°C sea temperature in March in Portsmouth26
27°C sea temperature in April in Portsmouth27
27°C sea temperature in May in Portsmouth27
28°C sea temperature in June in Portsmouth28
28°C sea temperature in July in Portsmouth28
28°C sea temperature in August in Portsmouth28
29°C sea temperature in September in Portsmouth29
29°C sea temperature in October in Portsmouth29
28°C sea temperature in November in Portsmouth28
27°C sea temperature in December in Portsmouth27

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

Sunshine & Daylight in Portsmouth

  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Daily hours of sunshine
Daily hours of daylight
11 hours of daylight per day in January in Portsmouth11
12 hours of daylight per day in February in Portsmouth12
12 hours of daylight per day in March in Portsmouth12
12 hours of daylight per day in April in Portsmouth12
13 hours of daylight per day in May in Portsmouth13
13 hours of daylight per day in June in Portsmouth13
13 hours of daylight per day in July in Portsmouth13
13 hours of daylight per day in August in Portsmouth13
12 hours of daylight per day in September in Portsmouth12
12 hours of daylight per day in October in Portsmouth12
11 hours of daylight per day in November in Portsmouth11
11 hours of daylight per day in December in Portsmouth11
UV Index (Maximum)
UV (maximum) index 9 (Very High) in January in Portsmouth9
UV (maximum) index 11 (Extreme) in February in Portsmouth11
UV (maximum) index 11+ (Extreme) in March in Portsmouth11
UV (maximum) index 11+ (Extreme) in April in Portsmouth11
UV (maximum) index 11+ (Extreme) in May in Portsmouth11
UV (maximum) index 11+ (Extreme) in June in Portsmouth11
UV (maximum) index 11+ (Extreme) in July in Portsmouth11
UV (maximum) index 11+ (Extreme) in August in Portsmouth11
UV (maximum) index 11+ (Extreme) in September in Portsmouth11
UV (maximum) index 11 (Extreme) in October in Portsmouth11
UV (maximum) index 9 (Very High) in November in Portsmouth9
UV (maximum) index 8 (Very High) 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
18 days with some rainfall in January in Portsmouth18
14 days with some rainfall in February in Portsmouth14
15 days with some rainfall in March in Portsmouth15
14 days with some rainfall in April in Portsmouth14
17 days with some rainfall in May in Portsmouth17
18 days with some rainfall in June in Portsmouth18
20 days with some rainfall in July in Portsmouth20
20 days with some rainfall in August in Portsmouth20
22 days with some rainfall in September in Portsmouth22
19 days with some rainfall in October in Portsmouth19
19 days with some rainfall in November in Portsmouth19
18 days with some rainfall in December in Portsmouth18
Average monthly rainfall (mm)
144 mm monthly rainfall in January in Portsmouth144
95 mm monthly rainfall in February in Portsmouth95
110 mm monthly rainfall in March in Portsmouth110
105 mm monthly rainfall in April in Portsmouth105
177 mm monthly rainfall in May in Portsmouth177
173 mm monthly rainfall in June in Portsmouth173
156 mm monthly rainfall in July in Portsmouth156
243 mm monthly rainfall in August in Portsmouth243
269 mm monthly rainfall in September in Portsmouth269
279 mm monthly rainfall in October in Portsmouth279
300 mm monthly rainfall in November in Portsmouth300
201 mm monthly rainfall in December in Portsmouth201

More about Portsmouth

Portsmouth by month

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

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The climate guide for Dominica (Portsmouth) 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.

What's the climate like in Portsmouth?

Portsmouth has a hot tropical climate with no dry season.

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

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Tropical storm risk: Portsmouth hurricane season

% of month affected by tropical storms
0
0
0
0
0
0
<1%
3%
3.9%
1.4%
0
0
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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Compare Portsmouth with the USA

Below the Portsmouth chart shows average maximum daytime temperature for Portsmouth, Dominica and the USA (Washington).

Maximum daytime temperature (°C)

Portsmouth, Dominica
USA (Washington)
28
5
29
7
29
13
30
19
30
24
31
29
31
31
31
30
31
26
30
20
30
14
29
8
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

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

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