January is a popular month to ask about Siesta Key Beach because conditions can shift week to week along this coast. Expect the water near 18.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Gulf of Mexico.
Siesta Key Beach sea temperature in January — averages 18.0°C
The sea at Siesta Key Beach in United States averages 18.0°C during January, based on long-run climatology for the Gulf of Mexico. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · January
18.0°C
mild · Good
Live water now
…
Recommended wetsuit
3/2mm fullsuit
At 18.0°C a 3/2mm fullsuit is the standard wetsuit for surfing and watersports.
Monthly comparison
Yes, but expect a fresh dip · Siesta Key Beach
Can you swim at Siesta Key Beach in June? — 26.0°C water26.0°CCan you swim at Siesta Key Beach in July? — 28.0°C water28.0°CCan you swim at Siesta Key Beach in August? — 28.0°C water28.0°CCan you swim at Siesta Key Beach in September? — 27.0°C water27.0°CCan you swim at Siesta Key Beach in October? — 25.0°C water25.0°CCan you swim at Siesta Key Beach in November? — 22.0°C water22.0°C
Frequently asked questions
What is the average sea temperature at Siesta Key Beach in January?
Siesta Key Beach averages 18.0°C in January, based on long-run climatology for the Gulf of Mexico.
Is the sea warm enough to swim at Siesta Key Beach in January?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Siesta Key Beach in January?
A 2 mm shorty is comfortable for sessions over 30 minutes.