Weather in Portsmouth: May
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Average day temperature: | 62.4°F |
| Average night temperature: | 50.5°F | |
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Sea water temperature: | 49.4°F |
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Number of sunny days: | 11 days |
| Day length: | 14.1 - 15.1 hours | |
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Number of rainy days: | 2 days |
| Precipitation totals: | 0.8 in. | |
| more information | ||
14 days
forecast
forecast
| Portsmouth |
sea water
temperature
temperature
| Portsmouth |
Air temperature in May, °F
Show year:
2025
2024
2023
The highest day temperature during May of 2025 was 80°F. At the same time the lowest night temperature was 42°F. Daily and nightly averages during May were 61.1°F and 50.8°F.
Sea water temperature in Portsmouth in May, °F
Show year:
2025
2024
2023
The average sea water temperature in May of 2025 was 48.8°F. The highest and lowest sea temperatures during the month were 52.3°F and 43.2°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in May is almost equal.
Precipitation total in May, in.
Precipitation total value in Portsmouth in May is 0.8 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 7.9 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 7.6.
Best time for vacation in Portsmouth
Portsmouth on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Portsmouth
Local time: 01:20
December 05, friday
0300
10°F
SE
11 mph
11 mph
0600
9°F
E
6 mph
6 mph
0900
12°F
E
6 mph
6 mph
1200
19°F
NE
7 mph
7 mph
1500
25°F
NE
10 mph
10 mph
1800
25°F
NE
6 mph
6 mph
2100
21°F
NE
6 mph
6 mph
December 06, saturday
0000
19°F
NE
6 mph
6 mph
