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Monthly climate in Seward, Alaska, United States

Last updated: March 2, 2024

Under the Köppen–Geiger climate classification Seward features a subarctic climate (Dfc). Temperatures typically range between -3 °C (26 °F) and 11 °C (52 °F) through the year, but rarely can drop to -16 °C (3 °F) or can rise to as high as 21 °C (70 °F). The average annual precipitation amounts to about 3085 mm (121.5 inches) and receives 202 rainy days on the 1 mm (0.04 inches) threshold annually. Seward enjoys an average of 1969 hours of sunshine throughout the year, and daylight varies from 5 hours 57 minutes to 18 hours 44 minutes per day.

Monthly average temperatures in Seward, Alaska, United States §

The warmest months in Seward are June, July and August, with daily mean temperatures ranging from 8 to 11 °C (46 - 52 °F) throughout the day. The coldest temperatures usually occur in January, February and March, when daily mean temperatures range from -3 to -3 °C (26 - 27 °F) throughout the day. On average each year, Seward experiences 0 days above 25 °C (77.0 °F) and 144 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Seward, Alaska, 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 4°C
(39°F)		 2°C
(36°F)		 5°C
(42°F)		 8°C
(47°F)		 14°C
(57°F)		 21°C
(69°F)		 21°C
(70°F)		 19°C
(66°F)		 15°C
(59°F)		 11°C
(52°F)		 6°C
(43°F)		 5°C
(41°F)
Mean maximum 3°C
(37°F)		 2°C
(35°F)		 2°C
(36°F)		 7°C
(44°F)		 11°C
(51°F)		 14°C
(58°F)		 19°C
(66°F)		 17°C
(62°F)		 13°C
(55°F)		 9°C
(48°F)		 5°C
(42°F)		 4°C
(40°F)
Average high -2°C
(29°F)		 -1°C
(30°F)		 -2°C
(29°F)		 2°C
(36°F)		 5°C
(42°F)		 9°C
(49°F)		 13°C
(55°F)		 12°C
(54°F)		 9°C
(49°F)		 5°C
(40°F)		 -0°C
(32°F)		 0°C
(32°F)
Daily mean -3°C
(26°F)		 -3°C
(27°F)		 -3°C
(27°F)		 1°C
(34°F)		 4°C
(39°F)		 8°C
(46°F)		 11°C
(52°F)		 11°C
(51°F)		 8°C
(46°F)		 3°C
(38°F)		 -2°C
(30°F)		 -1°C
(30°F)
Average low -5°C
(24°F)		 -4°C
(25°F)		 -5°C
(24°F)		 -1°C
(31°F)		 2°C
(37°F)		 6°C
(43°F)		 9°C
(49°F)		 9°C
(49°F)		 6°C
(43°F)		 2°C
(36°F)		 -3°C
(27°F)		 -3°C
(27°F)
Mean minimum -12°C
(11°F)		 -11°C
(13°F)		 -10°C
(14°F)		 -6°C
(22°F)		 -0°C
(32°F)		 4°C
(39°F)		 7°C
(44°F)		 6°C
(43°F)		 3°C
(37°F)		 -4°C
(24°F)		 -10°C
(15°F)		 -10°C
(15°F)
Minimum -15°C
(6°F)		 -12°C
(10°F)		 -15°C
(5°F)		 -14°C
(7°F)		 -1°C
(31°F)		 3°C
(37°F)		 5°C
(42°F)		 5°C
(40°F)		 -1°C
(31°F)		 -8°C
(18°F)		 -16°C
(3°F)		 -15°C
(5°F)

Compare climate in Seward with other places

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

Monthly average precipitation in Seward, Alaska, United States §

Seward usually has the most precipitation in October, November and December, with an average of 20 rainy days and 399 mm (15.7 inches) of precipitation per month. The driest months in Seward are February, June and July. On average, 159 mm (6.3 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Seward, Alaska, 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) 264 (10.4) 166 (6.5) 177 (7.0) 187 (7.4) 276 (10.9) 150 (5.9) 161 (6.3) 193 (7.6) 314 (12.4) 438 (17.3) 334 (13.1) 425 (16.7)
Average precipitation days (≥ 1 mm) 15 14 13 16 21 15 14 16 18 21 16 23

Monthly sunshine hours in Seward, Alaska, United States §

The sunniest months in Seward are June, July and August, when the sun shines an average of 8 hours 30 minutes a day. Least sunny months in Seward: January, November and December receive an average of 1 hours 49 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Seward, Alaska, 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 49 114 200 222 206 271 265 246 169 106 87 30
Mean daily daylight hours 6h 48m 9h 10m 11h 54m 14h 41m 17h 15m 18h 44m 17h 53m 15h 28m 12h 45m 10h 0m 7h 26m 5h 57m

Solar UV radiation in Seward, Alaska, United States §

Seward experiences the highest level of ultraviolet (UV) radiation in May, July and August, when the maximum UV index can reach values of 6 - 7, which corresponds to the High category of sun exposure. January, November and December are in the Low exposure category. In these months, the maximum values of the UV index do not exceed 1. For more detailed information, check out our hourly Seward UV Index data.

Average daily maximum UV levels by month for Seward, Alaska, 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) 1 2 3 4 6 6 7 6 4 2 1 1

Detailed Monthly Weather Insights for Seward, Alaska, United States

Discover in-depth weather details for every month in Seward. Click through the links below for comprehensive overviews of temperature trends, precipitation levels, sunshine hours, and solar UV radiation specifics. Whether planning a visit or simply curious about Seward's climate nuances, these monthly breakdowns provide the information you need for an informed understanding of what to expect throughout the year.

Each link leads to a detailed account of the typical weather conditions for that month, providing both locals and tourists with vital information to plan their daily activities, wardrobe, and travel itineraries accordingly.