Alaska: water temperature

At sea, 8.2 °C on average across 52 stations, from 1.3 °C (9491094 - Red Dog Dock, AK) to 11.1 °C (CAPE EDGECUMBE - 25NM SSW of Cape Edgecumbe, AK). In fresh water, 3.3 °C on average across 52 stations, from -1.0 °C (NABESNA RIVER NEAR NORTHWAY 14SSW) to 32.1 °C (KOYUKUK RIVER BELOW JOHN RIVER NEAR BETTLES 5WSW).

See on the map

Sea and ocean

Lakes and rivers

Where to swim, month by month

The normal sea temperature each month along the coast: pick a month to see where the water is warmest and whether you can swim.

• January 2.0 °C · up to 6.0 °C
• February 1.6 °C · up to 5.6 °C
• March 1.5 °C · up to 5.2 °C
• April 1.7 °C · up to 5.8 °C
• May 3.2 °C · up to 7.8 °C
• June 5.9 °C · up to 10.7 °C
• July 9.1 °C · up to 13.3 °C
• August 10.2 °C · up to 13.9 °C
• September 9.1 °C · up to 12.5 °C
• October 6.7 °C · up to 10.3 °C
• November 4.3 °C · up to 8.4 °C
• December 2.7 °C · up to 7.0 °C

Warmest water today

Where these numbers come from

Every value is a real reading from an instrument, at its position: a buoy, a wharf, a river or lake station. It keeps the time it was measured. A reading too far from those of nearby stations is marked with a “?”. Between stations, the map gives a satellite or model estimate, always labelled as such.

Sources: Bouées de houle CDIP, IOOS, stations côtières, NOAA CO-OPS, NOAA NDBC, USGS, eaux des États-Unis. Sources and credits

Nearby

• Washington 92 stations · sea 11.8 °C · fresh water 9.5 °C
• Oregon 215 stations · sea 12.0 °C · fresh water 10.0 °C
• Idaho 23 stations · fresh water 9.6 °C
• Montana 56 stations · fresh water 7.1 °C
• North Dakota 13 stations · fresh water 8.9 °C
• California 191 stations · sea 19.5 °C · fresh water 13.8 °C