Alki Beach Seattle Water Temperature & Swim Forecast
Coastal beach near Seattle.
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Location
Alki Beach Seattle on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Alki Beach Seattle's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Alki Beach Seattle swimming conditions summary
- Water temperature
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- Water feels
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- Swimmable today
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- Swim conditions score
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- Wetsuit needed
- Check live temperature
- Air temperature
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- Waves
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- Wind
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- UV index
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- Warmest months to swim
- July, August, September
Live water temperature is loading — refresh in a moment for a precise recommendation. Live marine data updated hourly from Open-Meteo Marine.
Frequently asked questions
Can I swim at Alki Beach Seattle right now?
Live data is loading. Use the 7-day forecast above to plan your swim — conditions above 22°C are comfortable for most swimmers.
What will the sea temperature be at Alki Beach Seattle next week?
Based on long-term August averages and the latest marine model, expect the sea around Alki Beach Seattle to sit close to 28.0°C over the next 7 days. Check the live 7-day chart above for the exact daily outlook.
When is the best month to swim at Alki Beach Seattle?
July – August – September are typically the warmest months to swim at Alki Beach Seattle, with sea temperatures at their seasonal peak.
Can I swim at Alki Beach Seattle today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Washington, United States (Puget Sound).
- • Family friendly with calm, accessible water.
- • Live data refreshed hourly from Open-Meteo Marine.
Monthly sea temperature averages
Tap any month to see what to expect — based on regional climatology.
Best time to swim in Alki Beach Seattle
The sea in Alki Beach Seattle peaks in July, when the water averages around 28°C.
The main swimming season runs from April – November, when surface temperatures stay comfortable for extended sessions.
On average, 8 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
Shoulder months like March and December are noticeably cooler but often quieter, with fewer crowds and steadier weather.
The coldest month is typically January at around 18°C, when cold-water swimmers dominate the coast.
Alki Beach Seattle sea temperature history
Long-term climatology for Alki Beach Seattle shows an annual mean sea temperature of 23°C, ranging from 18°C in winter to 28°C at the summer peak.
The seasonal swing is roughly 10°C between the coldest and warmest month — a useful yardstick when comparing years or checking whether the current sea is running above or below average.
Recent decades have trended slightly warmer at Alki Beach Seattle, in line with regional sea-surface temperature records for the wider basin.
Monthly averages below are drawn from multi-decadal climatology and are updated as new observations arrive.
Alki Beach Seattle sea temperature: frequently asked questions
What is the warmest month to swim in Alki Beach Seattle?
July is the warmest month in Alki Beach Seattle, when the sea averages about 28°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Alki Beach Seattle?
The coldest month in Alki Beach Seattle is typically January, when the water averages around 18°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Alki Beach Seattle without a wetsuit?
The main swimming season in Alki Beach Seattle runs from April – November — about 8 months a year when the sea sits above 20°C, the level most swimmers describe as pleasant without a wetsuit.
Do I need a wetsuit in Alki Beach Seattle?
Outside peak summer the water in Alki Beach Seattle drops toward 19°C, so a 3/2mm shorty or full wetsuit makes long swims much more comfortable. In peak months most swimmers go without.
What is the average sea temperature in Alki Beach Seattle?
The long-term annual mean sea temperature in Alki Beach Seattle is about 23°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Alki Beach Seattle?
The live reading at the top of this page shows the current sea temperature in Alki Beach Seattle, updated hourly from marine buoy and satellite data. The 7-day forecast covers water, air, waves, wind and UV for the week ahead.
Year-round sea temperature
Best swim months: Apr – May – Jun – Jul – Aug – Sep – Oct – Nov
| Month | Sea | Comfort |
|---|---|---|
| Jan | 18°C | Pleasant |
| Feb | 18°C | Pleasant |
| Mar | 19°C | Pleasant |
| Apr | 21°C | Pleasant |
| May | 23°C | Warm |
| Jun | 26°C | Hot |
| Jul ⭐ | 28°C | Hot |
| Aug | 28°C | Hot |
| Sep | 27°C | Hot |
| Oct | 25°C | Warm |
| Nov | 22°C | Warm |
| Dec | 19°C | Pleasant |
Nearby beaches
The closest coastline, with live water temperatures.