Can you swim here today?
Grand Marais Harbor
Minnesota · Bay
Cold water — serious cold-shock risk today
Cold waterAs of August 21, 2026, the water temperature at Grand Marais Harbor is 51°F (10°C), measured by NOAA buoy GDMM5, 0.2 miles away.
Cold water — serious cold-shock risk today: water temperature is 51°F, cold enough to cause cold-water shock on sudden immersion.
- Water temperature is 51°F, cold enough to cause cold-water shock on sudden immersion. — NOAA buoy GDMM5, as of Aug 21, 8:18 PM UTC
- Heavy rain today can raise bacteria levels near outfalls and river mouths.
Water temp
51°F
10°C
No official beach-advisory feed for Minnesota yet — follow posted signs and local guidance.
Live data from NOAA buoy GDMM5 (0.2 mi away), as of Aug 21, 8:18 PM UTC.
Before you get in
- Never swim alone — and keep weaker swimmers within arm's reach.
- Scout depth and entry/exit points before you get in.
- Read the current: avoid fast, rising, or murky water.
- Check the forecast — get out well before storms or lightning.
- Obey posted signs, flags, and lifeguard guidance.
Read next
Conditions are for general information only and can change quickly. Always judge the water in person and follow posted advisories and local guidance before swimming or paddling.