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Monthly climate in Portsmouth, Virginia, United States

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Portsmouth features a humid subtropical climate (Cfa).Temperatures typically range between 6 °C (43 °F) and 27 °C (81 °F) through the year, but rarely can drop to -15 °C (5 °F) or can rise to as high as 37 °C (99 °F).The average annual precipitation amounts to about 1302 mm (51.2 inches) and receives 139 rainy days on the 1 mm (0.04 inches) threshold annually.Portsmouth enjoys an average of 3186 hours of sunshine throughout the year, and daylight varies from 9 hours 40 minutes to 14 hours 37 minutes per day.

Monthly average temperatures in Portsmouth, Virginia, United States §

The warmest months in Portsmouth are June, July and August, with daily mean temperatures ranging from 24 to 27 °C (76 - 81 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 6 to 8 °C (43 - 47 °F) throughout the day. On average each year, Portsmouth experiences 128 days above 25 °C (77.0 °F) and 31 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Portsmouth, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 23°C
(74°F)		 26°C
(78°F)		 30°C
(85°F)		 31°C
(88°F)		 35°C
(96°F)		 36°C
(97°F)		 37°C
(99°F)		 36°C
(97°F)		 35°C
(95°F)		 34°C
(93°F)		 28°C
(82°F)		 23°C
(74°F)
Mean maximum 21°C
(71°F)		 23°C
(74°F)		 27°C
(80°F)		 29°C
(84°F)		 32°C
(91°F)		 34°C
(93°F)		 35°C
(95°F)		 34°C
(94°F)		 33°C
(91°F)		 30°C
(87°F)		 26°C
(79°F)		 22°C
(72°F)
Average high 10°C
(51°F)		 13°C
(56°F)		 15°C
(60°F)		 21°C
(70°F)		 25°C
(77°F)		 29°C
(84°F)		 31°C
(88°F)		 30°C
(87°F)		 28°C
(82°F)		 23°C
(74°F)		 16°C
(62°F)		 13°C
(55°F)
Daily mean 6°C
(43°F)		 8°C
(47°F)		 10°C
(51°F)		 16°C
(60°F)		 20°C
(69°F)		 24°C
(76°F)		 27°C
(81°F)		 26°C
(79°F)		 24°C
(75°F)		 19°C
(66°F)		 11°C
(53°F)		 8°C
(47°F)
Average low 2°C
(35°F)		 4°C
(39°F)		 6°C
(43°F)		 11°C
(52°F)		 16°C
(61°F)		 20°C
(69°F)		 23°C
(74°F)		 23°C
(73°F)		 20°C
(69°F)		 15°C
(59°F)		 7°C
(45°F)		 4°C
(39°F)
Mean minimum -8°C
(18°F)		 -5°C
(23°F)		 -3°C
(26°F)		 3°C
(37°F)		 7°C
(46°F)		 15°C
(60°F)		 18°C
(65°F)		 18°C
(65°F)		 14°C
(57°F)		 6°C
(43°F)		 -1°C
(31°F)		 -4°C
(25°F)
Minimum -15°C
(5°F)		 -7°C
(20°F)		 -5°C
(24°F)		 1°C
(34°F)		 5°C
(41°F)		 12°C
(54°F)		 15°C
(59°F)		 17°C
(63°F)		 12°C
(54°F)		 4°C
(39°F)		 -2°C
(29°F)		 -6°C
(21°F)

Compare climate in Portsmouth with other places

Compare temperature, precipitation, sunshine, UV index in Portsmouth, Virginia, United States with other places around the world.

Monthly average precipitation in Portsmouth, Virginia, United States §

Portsmouth usually has the most precipitation in July, August and September, with an average of 15 rainy days and 146 mm (5.7 inches) of precipitation per month.The driest months in Portsmouth are March, November and December. On average, 82 mm (3.2 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Portsmouth, Virginia, United States.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 90 (3.5) 99 (3.9) 79 (3.1) 97 (3.8) 121 (4.7) 121 (4.8) 142 (5.6) 169 (6.6) 127 (5.0) 91 (3.6) 78 (3.1) 89 (3.5)
Average precipitation days (≥ 1 mm) 8 12 10 11 11 13 15 19 13 9 9 9

Monthly sunshine hours in Portsmouth, Virginia, United States §

The sunniest months in Portsmouth are June, July and August, when the sun shines an average of 10 hours 51 minutes a day.Least sunny months in Portsmouth: January, February and December receive an average of 6 hours 4 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Portsmouth, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 166 185 259 289 311 325 347 327 287 259 227 200
Mean daily daylight hours 9h 56m 10h 50m 11h 59m 13h 9m 14h 8m 14h 37m 14h 21m 13h 29m 12h 21m 11h 11m 10h 10m 9h 40m

Solar UV radiation in Portsmouth, Virginia, United States §

Portsmouth experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 10 - 11, which corresponds to the Very High / Extreme category of sun exposure.January, November and December are in the Moderate exposure category. In these months, the maximum values of the UV index do not exceed 5. For more detailed information, check out our hourly Portsmouth UV Index data.

Average daily maximum UV levels by month for Portsmouth, Virginia, United States.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 4 6 8 9 10 10 11 10 9 8 5 3