Portsmouth, New Hampshire Climate
United States
Pop. 21,530 Elev. 13 m / 43 ft
TZ: America/New_York (UTC-4) ·
Summers in Portsmouth are mild, with July highs around 78°F (26°C), while winters are frigid with February lows of 22°F (-6°C). Wind chill can push winter lows to 12°F (-11°C). Expect around 55 rainy days annually (36.4 in / 925 mm total), with snow on 11 days and 52 in (1317 mm) of annual accumulation. The city averages 133 sunny days per year. Ocean water temperatures reach 70°F (21°C) in summer.
| Temperature | 78°F (26°C) high | 22°F (-6°C) low |
| Feels like | 12°F (-11°C) low | |
| Rain | 55 days | 36.4 in (925 mm) /yr |
| Snow | 11 days | 51.9 in (1317 mm) /yr |
| Sky | 133 sunny | 19 stormy |
| Wind | 4.5 mph (2.0 m/s) avg |
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Explore on the MapMonthly Climate Chart
Best months to visit: Jun, Jul, Aug, Sep
Sky & Air by Month
Cloud cover (%)
44
Jan 56
Feb 64
Mar 66
Apr 76
May 59
Jun 55
Jul 43
Aug 51
Sep 45
Oct 50
Nov 55
Dec Humidity (%)
60
Jan 67
Feb 66
Mar 65
Apr 79
May 76
Jun 75
Jul 71
Aug 78
Sep 72
Oct 68
Nov 68
Dec Weather Days by Month
Water Temperatures
Cities with Similar Climate
Find similar cities on the map →Nearby Cities
Nearby
Commercial airport 3 mi Portsmouth International Airport at Pease (PSM)
Ski resort 7 mi Mackey Skate Park
National park 67 mi Fort Baldwin State Historic Site
Mountain peak
(5,460 ft) 86 mi Boott Spur
Hospital 2 mi Portsmouth Regional Hospital
Hiking trail 5 mi Red Trail
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Monthly Weather Data
↑ See chart| Month | Avg High | Avg Low | Rainfall | Snowfall | Sunny Days |
|---|---|---|---|---|---|
| January | 33°F 1°C | 22°F -5°C | 1.0 in 26 mm | 6.9 in175 mm | 14 |
| February | 34°F 1°C | 22°F -6°C | 1.6 in 42 mm | 24.2 in614 mm | 9 |
| March | 46°F 8°C | 33°F 1°C | 4.2 in 108 mm | 2.4 in62 mm | 9 |
| April | 54°F 12°C | 42°F 5°C | 4.6 in 117 mm | 4.7 in119 mm | 8 |
| May | 60°F 16°C | 50°F 10°C | 6.9 in 176 mm | — | 4 |
| June | 72°F 22°C | 60°F 16°C | 2.1 in 55 mm | — | 11 |
| July | 78°F 26°C | 67°F 19°C | 2.8 in 70 mm | — | 11 |
| August | 75°F 24°C | 62°F 17°C | 1.3 in 33 mm | — | 16 |
| September | 70°F 21°C | 58°F 15°C | 2.4 in 61 mm | — | 11 |
| October | 60°F 16°C | 49°F 10°C | 4.4 in 111 mm | — | 18 |
| November | 48°F 9°C | 38°F 3°C | 2.6 in 66 mm | 0.1 in2 mm | 12 |
| December | 36°F 2°C | 24°F -5°C | 2.4 in 61 mm | 13.6 in345 mm | 10 |
Weather Days by Month
↑ See chart| Month | Sunny Days | Storm Days |
|---|---|---|
| January | 14 | 0 |
| February | 9 | 1 |
| March | 9 | 0 |
| April | 8 | 2 |
| May | 4 | 5 |
| June | 11 | 1 |
| July | 11 | 4 |
| August | 16 | 1 |
| September | 11 | 1 |
| October | 18 | 2 |
| November | 12 | 1 |
| December | 10 | 1 |
Water Temperatures Data
↑ See chart| Month | Ocean Avg High | Lake Avg High |
|---|---|---|
| January | 44°F 7°C | 36°F 2°C |
| February | 41°F 5°C | 35°F 2°C |
| March | 41°F 5°C | 36°F 2°C |
| April | 46°F 8°C | 43°F 6°C |
| May | 52°F 11°C | 53°F 12°C |
| June | 64°F 18°C | 63°F 17°C |
| July | 68°F 20°C | 71°F 22°C |
| August | 70°F 21°C | 69°F 21°C |
| September | 65°F 18°C | 64°F 18°C |
| October | 62°F 17°C | 56°F 13°C |
| November | 54°F 12°C | 44°F 7°C |
| December | 48°F 9°C | 37°F 3°C |