Portsmouth weather in May 2025

Expect 66°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Portsmouth in May. Check more long-term weather averages for Portsmouth in May before you book your next holiday to New Hampshire in 2025/2026.

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

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The May weather guide for New Hampshire (Portsmouth) shows long term 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.

Metric (°C) | Imperial (°F)

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How hot is it in Portsmouth in May?

Daytime temperatures usually reach 66°F in Portsmouth in May, falling to 43°F at night.

How sunny is it in Portsmouth in May?

There are normally 8 hours of bright sunshine each day in Portsmouth in May - that's 55% of daylight hours.

How warm is the sea around Portsmouth in May?

The average sea temperature around Portsmouth in May is 48°F.

Does it rain in Portsmouth in May?

There are usually 12 days with some rain in Portsmouth in May and the average monthly rainfall is 3.4 inches.

Portsmouth May sunrise & sunset times

Browse the sunrise and sunset times for Portsmouth in May 2025. Select a month to view Portsmouth sunrise and sunset times for the next 12 months.

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

Date	Sunrise times	Sunset times
Thursday, 1st May 2025	04:36	18:45
Friday, 16th May 2025	04:18	19:01
Saturday, 31st May 2025	04:07	19:15

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New Hampshire - quick facts
Flight time^✝	11.5 hours
Time difference	UK -5 hours
Language(s)	English
Currency	US Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	New Hampshire Division of Travel & Tourism Development