Portsmouth weather by month

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

Temperature
Rainfall
Sunshine & UV index

Temperature in Portsmouth (°F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	82	84	84	86	86	88	88	88	88	86	86	84
Min temperature (night-time)	70	70	70	72	73	73	75	75	75	73	72	72
Heat & Humidity	M	M	M	H	H	H	H	H	H	H	H	M
Sea temperature	81	79	79	81	81	82	82	82	84	84	82	81

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

Sunshine & UV index in Portsmouth

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daily hours of sunshine	7	7	8	8	8	8	8	8	7	7	7	6
Daily hours of daylight	11	12	12	12	13	13	13	13	12	12	11	11
UV Index (Maximum)	9	11	11	11	11	11	11	11	11	11	9	8

Rainfall in Portsmouth

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	18	14	15	14	17	18	20	20	22	19	19	18
Average monthly rainfall (inches)	5.7	3.7	4.3	4.1	7.0	6.8	6.1	9.6	10.6	11.0	11.8	7.9

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.

Portsmouth weather in January

Expect daytime maximum temperatures of 82°F in Portsmouth, Dominica in January based on long-term weather averages. There are 7 hours of sunshine per day on average with 18 days with some rainfall and typically 5.7 inches of rainfall in the month.

82
82°F max day temperature
7
7 hours of sunshine per day
18
18 days with some rainfall
70
70°F min night temperature
11
11 hours of daylight per day
M
Moderate heat & humidity
5.7
5.7 inches of monthly rainfall
9
9 (Very High) UV index
81
81°F sea temperature

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Portsmouth weather in February

Expect daytime maximum temperatures of 84°F in Portsmouth, Dominica in February based on long-term weather averages. There are 7 hours of sunshine per day on average with 14 days with some rainfall and typically 3.7 inches of rainfall in the month.

84
84°F max day temperature
7
7 hours of sunshine per day
14
14 days with some rainfall
70
70°F min night temperature
12
12 hours of daylight per day
M
Moderate heat & humidity
3.7
3.7 inches of monthly rainfall
11
11 (Extreme) UV index
79
79°F sea temperature

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Portsmouth weather in March

Expect daytime maximum temperatures of 84°F in Portsmouth, Dominica in March based on long-term weather averages. There are 8 hours of sunshine per day on average with 15 days with some rainfall and typically 4.3 inches of rainfall in the month.

84
84°F max day temperature
8
8 hours of sunshine per day
15
15 days with some rainfall
70
70°F min night temperature
12
12 hours of daylight per day
M
Moderate heat & humidity
4.3
4.3 inches of monthly rainfall
11
11+ (Extreme) UV index
79
79°F sea temperature

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Portsmouth weather in April

Expect daytime maximum temperatures of 86°F in Portsmouth, Dominica in April and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 14 days with some rainfall and typically 4.1 inches of rainfall in the month.

86
86°F max day temperature
8
8 hours of sunshine per day
14
14 days with some rainfall
72
72°F min night temperature
12
12 hours of daylight per day
H
High heat & humidity
4.1
4.1 inches of monthly rainfall
11
11+ (Extreme) UV index
81
81°F sea temperature

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Portsmouth weather in May

Expect daytime maximum temperatures of 86°F in Portsmouth, Dominica in May and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 17 days with some rainfall and typically 7.0 inches of rainfall in the month.

86
86°F max day temperature
8
8 hours of sunshine per day
17
17 days with some rainfall
73
73°F min night temperature
13
13 hours of daylight per day
H
High heat & humidity
7.0
7.0 inches of monthly rainfall
11
11+ (Extreme) UV index
81
81°F sea temperature

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Portsmouth weather in June

Expect daytime maximum temperatures of 88°F in Portsmouth, Dominica in June and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 18 days with some rainfall and typically 6.8 inches of rainfall in the month.

88
88°F max day temperature
8
8 hours of sunshine per day
18
18 days with some rainfall
73
73°F min night temperature
13
13 hours of daylight per day
H
High heat & humidity
6.8
6.8 inches of monthly rainfall
11
11+ (Extreme) UV index
82
82°F sea temperature

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Portsmouth weather in July

Expect daytime maximum temperatures of 88°F in Portsmouth, Dominica in July and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 20 days with some rainfall and typically 6.1 inches of rainfall in the month.

88
88°F max day temperature
8
8 hours of sunshine per day
20
20 days with some rainfall
75
75°F min night temperature
13
13 hours of daylight per day
H
High heat & humidity
6.1
6.1 inches of monthly rainfall
11
11+ (Extreme) UV index
82
82°F sea temperature

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Portsmouth weather in August

Expect daytime maximum temperatures of 88°F in Portsmouth, Dominica in August and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 20 days with some rainfall and typically 9.6 inches of rainfall in the month.

88
88°F max day temperature
8
8 hours of sunshine per day
20
20 days with some rainfall
75
75°F min night temperature
13
13 hours of daylight per day
H
High heat & humidity
9.6
9.6 inches of monthly rainfall
11
11+ (Extreme) UV index
82
82°F sea temperature

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Portsmouth weather in September

Expect daytime maximum temperatures of 88°F in Portsmouth, Dominica in September and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with 22 days with some rainfall and typically 10.6 inches of rainfall in the month.

88
88°F max day temperature
7
7 hours of sunshine per day
22
22 days with some rainfall
75
75°F min night temperature
12
12 hours of daylight per day
H
High heat & humidity
10.6
10.6 inches of monthly rainfall
11
11+ (Extreme) UV index
84
84°F sea temperature

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Portsmouth weather in October

Expect daytime maximum temperatures of 86°F in Portsmouth, Dominica in October and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with 19 days with some rainfall and typically 11.0 inches of rainfall in the month.

86
86°F max day temperature
7
7 hours of sunshine per day
19
19 days with some rainfall
73
73°F min night temperature
12
12 hours of daylight per day
H
High heat & humidity
11.0
11.0 inches of monthly rainfall
11
11 (Extreme) UV index
84
84°F sea temperature

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Portsmouth weather in November

Expect daytime maximum temperatures of 86°F in Portsmouth, Dominica in November and high heat and humidity based on long-term weather averages. There are 7 hours of sunshine per day on average with 19 days with some rainfall and typically 11.8 inches of rainfall in the month.

86
86°F max day temperature
7
7 hours of sunshine per day
19
19 days with some rainfall
72
72°F min night temperature
11
11 hours of daylight per day
H
High heat & humidity
11.8
11.8 inches of monthly rainfall
9
9 (Very High) UV index
82
82°F sea temperature

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Portsmouth weather in December

Expect daytime maximum temperatures of 84°F in Portsmouth, Dominica in December based on long-term weather averages. There are 6 hours of sunshine per day on average with 18 days with some rainfall and typically 7.9 inches of rainfall in the month.