Canada
Ontario · Lake Ontario
Sunnyside Beach
Ontario family beach.
Pleasant water with a light chop and a light breeze — good swimming conditions.
Sea temperature now
21.0°Cwarm
Excellent
Updated just now · Source: Open-Meteo Marine
Air temperature
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Wave height
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Wind
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UV index
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Location
Sunnyside Beach on the map, with nearby beaches and live sea temperatures.
7-day forecast
Water, air, waves, wind and UV outlook for the week ahead.
Wetsuit recommendation
Shorty 2mm
At 21.0°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene.
Surf & watersports
Pleasant but not warm. A short-arm short-leg ("shorty") wetsuit traps body heat through the core while leaving arms and legs free. Open-water swimmers training for 30–60 minutes can usually go without; longer sessions benefit from a thin swim wetsuit.
Open-water swimming
Most swimmers fine to 60 minutes without; consider a 2mm swim suit beyond.
Recommendation tuned for Sunnyside Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Quick answer
Can I swim at Sunnyside Beach today?
The sea is currently 21.0°C — excellent swimming conditions. Most swimmers will find it pleasant.
Key takeaways
- • Located in Ontario, Canada (Lake Ontario).
- • 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.
Year-round sea temperature
Best swim months: Jul – Aug
| Month | Sea | Comfort |
|---|---|---|
| Jan | 1°C | Cold |
| Feb | 0°C | Cold |
| Mar | 1°C | Cold |
| Apr | 4°C | Cold |
| May | 10°C | Cold |
| Jun | 16°C | Bracing |
| Jul | 21°C | Pleasant |
| Aug ⭐ | 22°C | Warm |
| Sep | 19°C | Pleasant |
| Oct | 13°C | Cold |
| Nov | 7°C | Cold |
| Dec | 3°C | Cold |
Can you swim here? — Sunnyside Beach
Warmer nearby
Cooler nearby
Same region this month — Ontario
Compare with
Nearby beaches
The closest coastline, with live water temperatures.