January is a popular month to ask about Sand Key because conditions can shift week to week along this coast. Expect the water near 19.0°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.
Sand Key sea temperature in January — averages 19.0°C
The sea at Sand Key in United States averages 19.0°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
19.0°C
mild · Good
Live water now
…
Recommended wetsuit
Shorty 2mm
At 19.0°C a 2mm shorty keeps surfers warm; lap swimmers can usually skip the neoprene.
Monthly comparison
Yes, but expect a fresh dip · Sand Key
Can you swim at Sand Key in June? — 29.0°C water29.0°CCan you swim at Sand Key in July? — 30.0°C water30.0°CCan you swim at Sand Key in August? — 30.0°C water30.0°CCan you swim at Sand Key in September? — 29.0°C water29.0°CCan you swim at Sand Key in October? — 27.0°C water27.0°CCan you swim at Sand Key in November? — 23.0°C water23.0°C
Frequently asked questions
What is the average sea temperature at Sand Key in January?
Sand Key averages 19.0°C in January, based on long-run climatology for the Gulf of Mexico.
Is the sea warm enough to swim at Sand Key in January?
It is swimmable but fresh; confident swimmers will be fine without a wetsuit.
Do I need a wetsuit at Sand Key in January?
A 2 mm shorty is comfortable for sessions over 30 minutes.