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 (°F)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Max temperature (daytime)	34	36	45	55	66	77	82	81	73	63	50	37
Min temperature (night-time)	12	16	25	34	43	52	59	57	50	39	30	19
Heat & Humidity	0	0	0	0	0	0	L	L	0	0	0	0
Sea temperature	41	39	37	41	48	55	63	64	61	54	48	45

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 (inches)	3.4	3.5	3.4	3.6	3.4	3.1	3.0	2.8	3.4	3.7	4.9	4.2

More about Portsmouth

Portsmouth by month

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

Recommended for New Hampshire

Auto Europe: Cheap car hire deals worldwide

Sale

Compare car hire prices to find lowest rate
Free cancellation up to 48 hours before pick up
Book car hire for over 20,000 destinations worldwide

Go to Auto Europe deal >>

View all Auto Europe offers

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 34°F in Portsmouth, New Hampshire 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 3.4 inches of rainfall in the month, which might fall as snow.

34
34°F max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
12
12°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
3.4
3.4 inches of monthly rainfall
1
1 (Low) UV index
41
41°F sea temperature

Back to months

Portsmouth weather in February

Expect daytime maximum temperatures of 36°F in Portsmouth, New Hampshire in February based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 3.5 inches of rainfall in the month, which might fall as snow.

36
36°F max day temperature
6
6 hours of sunshine per day
9
9 days with some rainfall
16
16°F min night temperature
11
11 hours of daylight per day
0
No heat & humidity
3.5
3.5 inches of monthly rainfall
2
2 (Low) UV index
39
39°F sea temperature

Back to months

Portsmouth weather in March

Expect daytime maximum temperatures of 45°F in Portsmouth, New Hampshire 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 3.4 inches of rainfall in the month.

45
45°F max day temperature
7
7 hours of sunshine per day
11
11 days with some rainfall
25
25°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
3.4
3.4 inches of monthly rainfall
3
3 (Moderate) UV index
37
37°F sea temperature

Back to months

Portsmouth weather in April

Expect daytime maximum temperatures of 55°F in Portsmouth, New Hampshire 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 3.6 inches of rainfall in the month.

55
55°F max day temperature
7
7 hours of sunshine per day
11
11 days with some rainfall
34
34°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
3.6
3.6 inches of monthly rainfall
5
5 (Moderate) UV index
41
41°F sea temperature

Back to months

Portsmouth weather in May

Expect daytime maximum temperatures of 66°F in Portsmouth, New Hampshire 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 3.4 inches of rainfall in the month.

66
66°F max day temperature
8
8 hours of sunshine per day
12
12 days with some rainfall
43
43°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.4
3.4 inches of monthly rainfall
7
7 (High) UV index
48
48°F sea temperature

Back to months

Portsmouth weather in June

Expect daytime maximum temperatures of 77°F in Portsmouth, New Hampshire 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 3.1 inches of rainfall in the month.

77
77°F max day temperature
9
9 hours of sunshine per day
11
11 days with some rainfall
52
52°F min night temperature
15
15 hours of daylight per day
0
No heat & humidity
3.1
3.1 inches of monthly rainfall
8
8 (Very High) UV index
55
55°F sea temperature

Back to months

Portsmouth weather in July

Expect daytime maximum temperatures of 82°F in Portsmouth, New Hampshire 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 3.0 inches of rainfall in the month.

82
82°F max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
59
59°F min night temperature
15
15 hours of daylight per day
L
Low heat & humidity
3.0
3.0 inches of monthly rainfall
8
8 (Very High) UV index
63
63°F sea temperature

Back to months

Portsmouth weather in August

Expect daytime maximum temperatures of 81°F in Portsmouth, New Hampshire 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 2.8 inches of rainfall in the month.

81
81°F max day temperature
9
9 hours of sunshine per day
10
10 days with some rainfall
57
57°F min night temperature
14
14 hours of daylight per day
L
Low heat & humidity
2.8
2.8 inches of monthly rainfall
7
7 (High) UV index
64
64°F sea temperature

Back to months

Portsmouth weather in September

Expect daytime maximum temperatures of 73°F in Portsmouth, New Hampshire in September based on long-term weather averages. There are 8 hours of sunshine per day on average with typically 3.4 inches of rainfall in the month.

73
73°F max day temperature
8
8 hours of sunshine per day
8
8 days with some rainfall
50
50°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
3.4
3.4 inches of monthly rainfall
6
6 (High) UV index
61
61°F sea temperature

Back to months

Portsmouth weather in October

Expect daytime maximum temperatures of 63°F in Portsmouth, New Hampshire in October based on long-term weather averages. There are 6 hours of sunshine per day on average with typically 3.7 inches of rainfall in the month.

63
63°F max day temperature
6
6 hours of sunshine per day
9
9 days with some rainfall
39
39°F min night temperature
11
11 hours of daylight per day
0
No heat & humidity
3.7
3.7 inches of monthly rainfall
3
3 (Moderate) UV index
54
54°F sea temperature

Back to months

Portsmouth weather in November

Expect daytime maximum temperatures of 50°F in Portsmouth, New Hampshire 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 4.9 inches of rainfall in the month.

50
50°F max day temperature
5
5 hours of sunshine per day
11
11 days with some rainfall
30
30°F min night temperature
10
10 hours of daylight per day
0
No heat & humidity
4.9
4.9 inches of monthly rainfall
2
2 (Low) UV index
48
48°F sea temperature

Back to months

Portsmouth weather in December

Expect daytime maximum temperatures of 37°F in Portsmouth, New Hampshire 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 4.2 inches of rainfall in the month, which might fall as snow.

37
37°F max day temperature
5
5 hours of sunshine per day
12
12 days with some rainfall
19
19°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
4.2
4.2 inches of monthly rainfall
1
1 (Low) UV index
45
45°F sea temperature

Back to months