Can you swim here today?
Sunset Bay Park on Grassy Key
Marathon, Florida · Park
Warm water — comfortable, stay sun-safe
Good to swimAs of August 23, 2026, the water temperature at Sunset Bay Park on Grassy Key is 91°F (33°C), measured by NOAA buoy VCAF1, 9.4 miles away.
Warm water — comfortable, stay sun-safe: water temperature is 91°F, warm enough that sun and heat are the main concerns.
- Water temperature is 91°F, warm enough that sun and heat are the main concerns. — NOAA buoy VCAF1, as of Aug 23, 1:54 PM UTC
Water temp
91°F
33°C
No official beach-advisory feed for Florida yet — follow posted signs and local guidance.
Live data from NOAA buoy VCAF1 (9.4 mi away), as of Aug 23, 1:54 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.