Harrison Lake vs Lake Union
Lake Union is the warmer swim right now at about 21.9°C. They are roughly 215 km apart in Canada and United States.
Harrison Lake
British Columbia
mild · modelled estimate
- September average
- 19.9°C
- Warmest month
- August · 21.0°C
- Coldest month
- 4.0°C
- Swim season
- July–September
Harrison Lake in British Columbia, Canada is swimmable in high summer, brisk either side of it, and drops close to single digits in winter.
Lake Union
Washington
warm · modelled estimate
- September average
- 21.9°C
- Warmest month
- August · 23.0°C
- Coldest month
- 7.0°C
- Swim season
- June–October
Lake Union in Washington, United States reaches comfortable swimming temperatures in July and August, and drops close to single digits in winter.
Month by month
| Lake | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Harrison Lake | 5.1°C | 4.0°C | 5.1°C | 8.3°C | 12.5°C | 16.8°C | 19.9°C | 21.0°C | 19.9°C | 16.8°C | 12.5°C | 8.3°C |
| Lake Union | 8.1°C | 7.0°C | 8.1°C | 11.0°C | 15.0°C | 19.0°C | 21.9°C | 23.0°C | 21.9°C | 19.0°C | 15.0°C | 11.0°C |
Monthly values are modelled from each lake's long-term winter and summer envelope, then refined with today's forecast air temperature for the headline reading.
Related lake comparisons
Want a different mix? Compare up to four lakes side by side or browse all lake water temperatures.
Explore every sea temperature page
Jump straight to a country, coastal region, city, seasonal ranking or comparison.