Seasonal ranking
Coldest sea temperature in Washington in September
Where the sea is coolest across Washington during September, ranked by long-term monthly average water temperature. Long Beach WA (Washington, United States) is the coolest at around 27°C. Open any spot for today's live water temperature and a 7-day swim forecast.
- 1Long Beach WAWashington · United States · Pacific OceanWarm — comfortable swimming27°CSeptember average
- 2Rialto BeachWashington · United States · Pacific OceanWarm — comfortable swimming27°CSeptember average
- 3Ocean ShoresWashington · United States · Pacific OceanWarm — comfortable swimming27°CSeptember average
- 4Alki BeachWashington · United States · Pacific OceanWarm — comfortable swimming27°CSeptember average
- 5First Beach La PushWashington · United States · Pacific OceanWarm — comfortable swimming27°CSeptember average
Coldest sea in September elsewhere
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Washington in September — frequently asked questions
- Where is the sea coldest in Washington in September?
- Long Beach WA in United States has the coldest sea in Washington in September, averaging about 27.0 °C. Rialto Beach (27.0 °C) and Ocean Shores are the next coolest.
- How many beaches in Washington are warm enough to swim in September?
- 5 of the top 5 ranked beaches in Washington average 22 °C or more in September, which most swimmers find comfortable without a wetsuit.
- How are these September sea temperatures calculated?
- Each figure is a long-term monthly average sea surface temperature for that location, so it reflects a typical September rather than today's reading. Open a beach page for the live water temperature and 7-day forecast.
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