United States: water temperature
At sea, 19.3 °C on average across 679 stations, from 1.2 °C (9491094 - Red Dog Dock, AK) to 30.2 °C (South Port Everglades, FL). In fresh water, 13.7 °C on average across 1950 stations, from -1.1 °C (NABESNA RIVER NEAR NORTHWAY 14SSW) to 34.2 °C (Hot C A Flume Nr Mammoth Lakes Ca).
State by state
- Alabama 31 stations · sea 22.5 °C · fresh water 18.0 °C
- Alaska 99 stations · sea 8.3 °C · fresh water 3.6 °C
- Arizona 17 stations · fresh water 17.0 °C
- Arkansas 28 stations · fresh water 17.3 °C
- California 190 stations · sea 19.5 °C · fresh water 14.3 °C
- Colorado 98 stations · fresh water 10.1 °C
- Connecticut 17 stations · sea 14.6 °C · fresh water 11.5 °C
- Delaware 24 stations · sea 16.0 °C · fresh water 13.4 °C
- District of Columbia 7 stations · sea 16.1 °C · fresh water 14.5 °C
- Florida 232 stations · sea 25.4 °C · fresh water 23.0 °C
- Georgia 100 stations · sea 21.4 °C · fresh water 16.4 °C
- Hawaii 24 stations · sea 27.0 °C · fresh water 20.2 °C
- Idaho 23 stations · fresh water 11.0 °C
- Illinois 31 stations · sea 15.1 °C · fresh water 16.5 °C
- Indiana 35 stations · fresh water 16.3 °C
- Iowa 10 stations · fresh water 15.8 °C
- Kansas 22 stations · fresh water 18.1 °C
- Kentucky 45 stations · fresh water 16.8 °C
- Louisiana 53 stations · sea 23.8 °C · fresh water 22.8 °C
- Maine 25 stations · sea 12.2 °C · fresh water 9.2 °C
- Maryland 41 stations · sea 17.4 °C · fresh water 13.2 °C
- Massachusetts 38 stations · sea 14.2 °C · fresh water 10.6 °C
- Michigan 95 stations · sea 13.1 °C · fresh water 12.5 °C
- Minnesota 14 stations · sea 12.5 °C · fresh water 11.6 °C
- Mississippi 10 stations · sea 21.1 °C · fresh water 21.5 °C
- Missouri 18 stations · fresh water 16.9 °C
- Montana 56 stations · fresh water 7.9 °C
- Nebraska 10 stations · fresh water 13.8 °C
- Nevada 12 stations · fresh water 12.8 °C
- New Hampshire 12 stations · sea 12.3 °C · fresh water 8.7 °C
- New Jersey 58 stations · sea 14.8 °C · fresh water 12.5 °C
- New Mexico 14 stations · fresh water 15.1 °C
- New York 95 stations · sea 14.7 °C · fresh water 11.5 °C
- North Carolina 58 stations · sea 19.3 °C · fresh water 16.1 °C
- North Dakota 13 stations · fresh water 9.6 °C
- Ohio 89 stations · sea 16.6 °C · fresh water 14.5 °C
- Oklahoma 17 stations · fresh water 21.5 °C
- Oregon 214 stations · sea 12.1 °C · fresh water 9.8 °C
- Pennsylvania 135 stations · sea 17.4 °C · fresh water 12.0 °C
- Rhode Island 25 stations · sea 14.2 °C · fresh water 10.1 °C
- South Carolina 82 stations · sea 20.2 °C · fresh water 18.5 °C
- Tennessee 17 stations · fresh water 16.6 °C
- Texas 119 stations · sea 25.3 °C · fresh water 23.4 °C
- Utah 23 stations · fresh water 11.3 °C
- Vermont 4 stations · fresh water 9.4 °C
- Virginia 61 stations · sea 17.1 °C · fresh water 13.0 °C
- Washington 91 stations · sea 11.7 °C · fresh water 9.4 °C
- West Virginia 35 stations · fresh water 13.1 °C
- Wisconsin 38 stations · sea 13.3 °C · fresh water 14.1 °C
- Wyoming 25 stations · fresh water 8.4 °C
Sea and ocean: elsewhere
| Station | Water | Measured |
|---|---|---|
| Bouée ancrée 14438 NOAA OSMC (réseau GTS) | 19.0 °C | 16 h ago |
| Bouée ancrée 14445 NOAA OSMC (réseau GTS) | 19.8 °C | 10 h ago |
| SOUTHWEST BERING SEA - 142NM NNE OF ATTU IS, AK NOAA NDBC | 6.4 °C | 1 h ago |
| WESTERN ALEUTIANS - 14NM SOUTH OF AMCHITKA IS, AK NOAA NDBC | 6.6 °C | 1 h ago |
Lakes and rivers: elsewhere
| Station | Water | Measured |
|---|---|---|
| Cheyenne River At Red Shirt, SD USGS, eaux des États-Unis | 9.2 °C | 1 h ago |
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 14.4 °C · up to 22.1 °C
- February 13.8 °C · up to 21.7 °C
- March 14.5 °C · up to 22.4 °C
- April 16.1 °C · up to 24.2 °C
- May 18.5 °C · up to 26.0 °C
- June 21.2 °C · up to 28.8 °C
- July 23.2 °C · up to 29.9 °C
- August 23.8 °C · up to 30.4 °C
- September 23.0 °C · up to 29.4 °C
- October 21.2 °C · up to 28.2 °C
- November 18.2 °C · up to 25.6 °C
- December 16.1 °C · up to 23.7 °C
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, Bouées de récifs (Aqualink), Golfe du Maine (NERACOOS), Golfe du Mexique (GCOOS), Grands Lacs (Seagull), Hawaï, sondes de rivage (PacIOOS), IOOS, stations côtières, NOAA CO-OPS, NOAA NDBC, NOAA OSMC (réseau GTS), USGS, eaux des États-Unis. Sources and credits
Nearby
- Mexico 3 stations · sea 30.1 °C
- Canada 416 stations · sea 11.5 °C · fresh water 6.2 °C
- Puerto Rico 11 stations · sea 29.9 °C · fresh water 28.8 °C
- United States Virgin Islands 4 stations · sea 30.5 °C
- Ireland 8 stations · sea 13.5 °C
- United Kingdom 111 stations · sea 13.8 °C · fresh water 10.4 °C