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 & daylight
UV levels & humidity

Temperature in Portsmouth (°C)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	1	2	7	13	19	25	28	27	23	17	10	3
Min temperature (night-time)	-11	-9	-4	1	6	11	15	14	10	4	-1	-7
Heat & Humidity	0	0	0	0	0	0	L	L	0	0	0	0
Sea temperature	5	4	3	5	9	13	17	18	16	12	9	7

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	5	6	7	7	8	9	9	9	8	6	5	5
Daily hours of daylight	9	11	12	13	15	15	15	14	12	11	10	9
UV Index (Maximum)	1	2	3	5	7	8	8	7	6	3	2	1

Rainfall in Portsmouth

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Number of days with some rain	11	9	11	11	12	11	10	10	8	9	11	12
Average monthly rainfall (mm)	87	88	87	92	86	78	77	70	87	94	125	107

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 New Hampshire (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 cold climate with warm summers and some rainfall in all months.

Portsmouth weather in January

Expect daytime maximum temperatures of 1°C in Portsmouth in January based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall and typically 87 mm of rainfall in the month, which might fall as snow.

1
1°C max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
-11
-11°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
87
87 mm of monthly rainfall
1
1 (Low) UV index
5
5°C sea temperature

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Portsmouth weather in February

Expect daytime maximum temperatures of 2°C in Portsmouth in February based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 88 mm of rainfall in the month, which might fall as snow.

2
2°C max day temperature
6
6 hours of sunshine per day
9
9 days with some rainfall
-9
-9°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
88
88 mm of monthly rainfall
2
2 (Low) UV index
4
4°C sea temperature

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Portsmouth weather in March

Expect daytime maximum temperatures of 7°C in Portsmouth in March based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 87 mm of rainfall in the month.

7
7°C max day temperature
7
7 hours of sunshine per day
11
11 days with some rainfall
-4
-4°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
87
87 mm of monthly rainfall
3
3 (Moderate) UV index
3
3°C sea temperature

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Portsmouth weather in April

Expect daytime maximum temperatures of 13°C in Portsmouth in April based on long-term weather averages. There are 7 hours of sunshine per day on average with 11 days with some rainfall and typically 92 mm of rainfall in the month.

13
13°C max day temperature
7
7 hours of sunshine per day
11
11 days with some rainfall
1
1°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
92
92 mm of monthly rainfall
5
5 (Moderate) UV index
5
5°C sea temperature

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Portsmouth weather in May

Expect daytime maximum temperatures of 19°C in Portsmouth in May based on long-term weather averages. There are 8 hours of sunshine per day on average with 12 days with some rainfall and typically 86 mm of rainfall in the month.

19
19°C max day temperature
8
8 hours of sunshine per day
12
12 days with some rainfall
6
6°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
86
86 mm of monthly rainfall
7
7 (High) UV index
9
9°C sea temperature

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Portsmouth weather in June

Expect daytime maximum temperatures of 25°C in Portsmouth in June based on long-term weather averages. There are 9 hours of sunshine per day on average with 11 days with some rainfall and typically 78 mm of rainfall in the month.

25
25°C max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
11
11°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
78
78 mm of monthly rainfall
8
8 (Very High) UV index
13
13°C sea temperature

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Portsmouth weather in July

Expect daytime maximum temperatures of 28°C in Portsmouth in July based on long-term weather averages. There are 9 hours of sunshine per day on average with 10 days with some rainfall and typically 77 mm of rainfall in the month.

28
28°C max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
15
15°C min night temperature
15
15 hours of daylight per day
L
Low heat & humidity
77
77 mm of monthly rainfall
8
8 (Very High) UV index
17
17°C sea temperature

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Portsmouth weather in August

Expect daytime maximum temperatures of 27°C in Portsmouth in August based on long-term weather averages. There are 9 hours of sunshine per day on average with 10 days with some rainfall and typically 70 mm of rainfall in the month.

27
27°C max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
14
14°C min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
70
70 mm of monthly rainfall
7
7 (High) UV index
18
18°C sea temperature

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Portsmouth weather in September

Expect daytime maximum temperatures of 23°C in Portsmouth in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 87 mm of rainfall in the month.

23
23°C max day temperature
8
8 hours of sunshine per day
8
8 days with some rainfall
10
10°C min night temperature
12
12 hours of daylight per day
0
No heat & humidity
87
87 mm of monthly rainfall
6
6 (High) UV index
16
16°C sea temperature

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Portsmouth weather in October

Expect daytime maximum temperatures of 17°C in Portsmouth in October based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 94 mm of rainfall in the month.

17
17°C max day temperature
6
6 hours of sunshine per day
9
9 days with some rainfall
4
4°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
94
94 mm of monthly rainfall
3
3 (Moderate) UV index
12
12°C sea temperature

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Portsmouth weather in November

Expect daytime maximum temperatures of 10°C in Portsmouth in November based on long-term weather averages. There are 5 hours of sunshine per day on average with 11 days with some rainfall and typically 125 mm of rainfall in the month.

10
10°C max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
-1
-1°C min night temperature
10
10 hours of daylight per day
0
No heat & humidity
125
125 mm of monthly rainfall
2
2 (Low) UV index
9
9°C sea temperature

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Portsmouth weather in December

Expect daytime maximum temperatures of 3°C in Portsmouth in December based on long-term weather averages. There are 5 hours of sunshine per day on average with 12 days with some rainfall and typically 107 mm of rainfall in the month, which might fall as snow.

3
3°C max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
-7
-7°C min night temperature
9
9 hours of daylight per day
0
No heat & humidity
107
107 mm of monthly rainfall
1
1 (Low) UV index
7
7°C sea temperature

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