Sombrero Beach Water Temperature & Swim Forecast
Popular Florida Keys beach near Marathon.
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Location
Sombrero 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.
Check live temperature
Live water temperature is loading — refresh in a moment for a precise recommendation.
Recommendation tuned for Sombrero Beach's current water temperature. Individual tolerance, wind chill, and session length all matter — when in doubt, size up.
Sombrero Beach 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 Sombrero Beach 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 Sombrero Beach next week?
Based on long-term August averages and the latest marine model, expect the sea around Sombrero Beach to sit close to 30.0°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 Sombrero Beach?
July – August – September are typically the warmest months to swim at Sombrero Beach, with sea temperatures at their seasonal peak.
Can I swim at Sombrero Beach today?
Live data is loading. In summer, this beach typically offers comfortable swimming conditions.
- • Located in Florida Keys, United States (Atlantic Ocean).
- • 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 Sombrero Beach
The sea in Sombrero Beach peaks in July, when the water averages around 30°C.
The main swimming season runs from January – December, when surface temperatures stay comfortable for extended sessions.
On average, 12 months a year sit above 20°C — the threshold most swimmers describe as pleasant without a wetsuit.
The coldest month is typically January at around 23°C, when cold-water swimmers dominate the coast.
Sombrero Beach sea temperature history
Long-term climatology for Sombrero Beach shows an annual mean sea temperature of 27°C, ranging from 23°C in winter to 30°C at the summer peak.
The seasonal swing is roughly 7°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 Sombrero Beach, 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.
Sombrero Beach sea temperature: frequently asked questions
What is the warmest month to swim in Sombrero Beach?
July is the warmest month in Sombrero Beach, when the sea averages about 30°C. Late-season warmth often persists a few weeks after peak.
When is the sea coldest in Sombrero Beach?
The coldest month in Sombrero Beach is typically January, when the water averages around 23°C. Cold-water swimmers and surfers dominate this period.
When can you swim in Sombrero Beach without a wetsuit?
The main swimming season in Sombrero Beach runs from January – December — about 12 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 Sombrero Beach?
Sombrero Beach stays warm year-round, so most swimmers never need a wetsuit — a rash guard is usually enough for sun and wildlife protection.
What is the average sea temperature in Sombrero Beach?
The long-term annual mean sea temperature in Sombrero Beach is about 27°C, based on multi-decadal climatology of the surrounding waters.
How do I check the current sea temperature in Sombrero Beach?
The live reading at the top of this page shows the current sea temperature in Sombrero Beach, 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: Jan – Feb – Mar – Apr – May – Jun – Jul – Aug – Sep – Oct – Nov – Dec
| Month | Sea | Comfort |
|---|---|---|
| Jan | 23°C | Warm |
| Feb | 23°C | Warm |
| Mar | 24°C | Warm |
| Apr | 26°C | Hot |
| May | 28°C | Hot |
| Jun | 29°C | Hot |
| Jul ⭐ | 30°C | Hot |
| Aug | 30°C | Hot |
| Sep | 30°C | Hot |
| Oct | 29°C | Hot |
| Nov | 26°C | Hot |
| Dec | 24°C | Warm |
Nearby beaches
The closest coastline, with live water temperatures.