Portsmouth Weather: August
 |
Average Day Temperature: | 80.0°F |
|
Average Night Temperature: | 65.7°F |
|
Sea Water Temperature: | 66.7°F |
|
Number of Sunny Days: | 11 days |
| Sunshine Hours: | 13.2 - 14.5 hours | |
|
Number of Rainy Days: | 2 days |
| Precipitation Totals: | 1.1 in | |
| detailed information | ||
forecast
| Portsmouth |
Temperature
| Portsmouth |
Air Temperature in August, °F
The highest day temperature in August 2025 was 99°F. The lowest night temperature was 53°F. The average values for day and night temperatures during August were 82.3°F и 62.7°F respectivly.
Portsmouth Water Sea Temperature in August, °F
The average sea surface temperature in August 2025 for Portsmouth was 64.8°F. The maximum and minimum values were 60.8°F and 67.0°F respectively.
You can expect various weather conditions during August. Be ready for sunny, cloudy or even gloomy days.
Precipitation Totals in August, in
Precipitation total in August for Portsmouth is 1.1 in.
The average wind speed in August is 6.5 mph. It makes August the most windless month of the year for Portsmouth.
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 August is 8.2 hours.
Portsmouth on the Weather Map
| Chicago |  |
-2 |
| Hawaii | |
+78 |
| Honolulu | |
+78 |
| Houston | |
+44 |
| Las Vegas |  |
+40 |
| Los Angeles | |
+52 |
| Maui | |
+72 |
| Miami | |
+72 |
| Miami Beach |  |
+80 |
| New York | |
+18 |
| San Diego | |
+54 |
| San Francisco | |
+46 |
| Sarasota | |
+62 |
| Tampa | |
+62 |
| Washington | |
+28 |
| 0600 |  |
4°F | E 6 mph |
| 0900 |  |
8°F | E 6 mph |
| 1200 | |
16°F | NE 7 mph |
| 1500 | |
22°F | NE 10 mph |
| 1800 |  |
22°F | NE 6 mph |
| 2100 | |
18°F | NE 6 mph |
| 0000 | |
16°F | NE 6 mph |
| 0300 | |
14°F | NE 5 mph |