Galveston water temperature, right now — and every month
A live Gulf reading, not an interpolated guess, plus the local verdict on when it is actually worth getting in.
Right now
90°F
Swim
90°F — comfortable, no wetsuit needed. Get in.
Updated 8:54 PM Galveston time · full beach conditions →
Month by month
Every month, the honest verdict
Averages built from a full year of hourly water-temperature readings — not a modeled estimate.
| Month | Avg water temp | Verdict | The honest note |
|---|---|---|---|
| January | 56°F | Skip | Locals aren't in the water. Surfers in wetsuits, nobody else. |
| February | 60°F | Skip | Coldest month on the books — save the swimsuit for spring. |
| March | 67°F | Wetsuit or brave it | Spring break crowds show up before the water's ready. Brisk, doable in short bursts. |
| April | 77°F | Swim | This is when locals actually get back in — comfortable, not warm. |
| May | 82°F | Swim | One of the two best months: warm water, ahead of peak-summer crowds. |
| June | 87°F | Swim | Bath-warm and it only gets warmer from here. Kids won't want to get out. |
| July | 90°F | Swim | Hottest water of the year — barely cooler than a bath. |
| August | 91°F | Swim | Peak warmth, peak humidity, peak crowd. Go early or after 5pm. |
| September | 88°F | Swim | Still bath-warm; crowds thin out fast after Labor Day. |
| October | 82°F | Swim | The other best month — warm water, fall light, real elbow room. |
| November | 73°F | Swim | Cooling quickly. Swimmable on a warm afternoon, but bring a towel you actually want to use. |
| December | 63°F | Wetsuit or brave it | Borderline. Most people are done for the year; a few hardy locals aren't. |
Monthly averages from NOAA CO-OPS hourly observations at Galveston Pier 21 (station 8771450), calendar year 2025.
Local knowledge
What the number doesn't tell you
It costs nothing to check, and nothing to get in. There's no gate on the Gulf. The only cost is parking or a beach entry fee at Stewart or East Beach — compare every beach stretch before you pick one.
Water temperature is one input, not the whole verdict. Check the live beach conditions page for wind, rip-current risk, and active alerts before you decide it's a beach day.
Who this is for: anyone deciding whether to pack a swimsuit or a wetsuit. For a cruise-day beach morning, the reading helps decide whether the sunrise plan includes a dip or just coffee and sand. Anglers watch it too — water temperature moves the fish; see the Galveston fishing guide.
The color is sediment, not sewage. Mississippi and Texas river runoff plus a shallow, muddy shelf keep the water brown-green here, not Caribbean blue. It's clean; it's just not clear. Calmer days and late summer run a slightly greener shade.
Want the bigger picture on timing a trip around the island's climate and crowds? Start with island basics or browse everything worth doing while the water warms up.
Quick answers
Water temperature FAQ
What is the water temperature in Galveston today?
As of the latest live reading, the Gulf at Galveston is 90°F.
What is the best month to swim in Galveston?
May and October, by a clear margin: both average 82°F, both sit outside the worst summer heat and crowds, and both are past or before the thickest sargassum pulses. June through September is warmer water but a hotter, busier island.
Can you swim in Galveston in December, January, or February?
Technically, yes — nobody's stopping you. Honestly, no. The Gulf averages 56–63°F those three months, which is wetsuit country. Surfers are out there in neoprene; swimsuits are not the move until March starts warming things up.
Why is Galveston Gulf water brown or green instead of blue?
Sediment carried down by the Mississippi and Texas rivers, plus a shallow, muddy Gulf floor near shore — not pollution. It's swimmable nearly year-round; it just never does postcard turquoise here. Calmer days and late summer tend to run a clearer green.
When does sargassum (seaweed) show up on Galveston beaches?
Sargassum lands in pulses roughly April through August, some years heavier than others. It's natural and harmless, just unsightly; paid beaches (Stewart, East Beach) get it groomed off fastest.