Portsmouth Weather: May
 |
Average Day Temperature: | 64.4°F |
|
Average Night Temperature: | 50.6°F |
|
Sea Water Temperature: | 49.4°F |
|
Number of Sunny Days: | 12 days |
| Sunshine Hours: | 14.1 - 15.1 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 0.8 in | |
| detailed information | ||
forecast
| Portsmouth |
Temperature
| Portsmouth |
Air Temperature in May, °F
The highest day temperature in May 2026 was 100°F. The lowest night temperature was 40°F. The average values for day and night temperatures during May were 68.3°F и 50.5°F respectivly.
Portsmouth Water Sea Temperature in May, °F
The average sea surface temperature in May 2026 for Portsmouth was 49.3°F. The maximum and minimum values were 45.0°F and 54.8°F respectively.
You can expect various weather conditions during May. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in May, in
Precipitation total in May for Portsmouth is 0.8 in. It makes may one of the least rainy months of the year.
The average wind speed in May is 7.9 mph.
We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Portsmouth in May is 8.1 hours.
Portsmouth on the Weather Map
| Boston |  |
+96 |
| Chicago | |
+84 |
| Hawaii |  |
+82 |
| Houston |  |
+82 |
| Las Vegas | |
+118 |
| Los Angeles | |
+100 |
| Maui | |
+78 |
| Miami | |
+96 |
| Myrtle Beach | |
+90 |
| New York | |
+104 |
| San Diego | |
+94 |
| San Francisco | |
+82 |
| Santa Monica | |
+82 |
| Sarasota | |
+96 |
| Tampa | |
+98 |
| 1800 |  |
92°F | SE 14 mph |
| 2100 |  |
80°F | E 6 mph |
| 0000 | |
72°F | E 6 mph |
| 0300 |  |
68°F | E 7 mph |
| 0600 |  |
66°F | E 7 mph |
| 0900 | |
80°F | E 8 mph |
| 1200 |  |
88°F | E 12 mph |
| 1500 | |
92°F | E 17 mph |