Pattaya Water Temperature by Month: What to Wear
Pattaya's sea stays warm all year. See month-by-month ranges, what to wear for diving or snorkeling, and when the water is best.
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Last updated November 2026. Pattaya water temperature sits in the high 20s °C most of the year, roughly 27-30 °C (81-86 °F) by one local technical dive operator. A rash vest or thin shorty is usually enough, which makes gear choices simple for anyone planning a trip through our Pattaya diving guide.
Featured image: Vyacheslav Argenberg, CC BY 4.0, via Wikimedia Commons.
Pattaya Water Temperature at a Glance
Thai Tec Diver, a technical diving operator working the Samaesan Islands, puts Pattaya sea temperature at 27-30 °C (81-86 °F) year-round. Its coolest months fall in the winter season. Monthly data from seatemperature.net shows a January range of 25-30 °C (77-86 °F) and a May range of 28-32 °C (82-90 °F). Those two sit at the edges of the usual spread. Warm water is the default here, so the practical questions are sun, wind and how long you stay in. Pages that quote 19-25 °C for the Gulf of Thailand conflict with every measured source above. Treat them as unreliable. Figures below were checked in November 2026.
Gulf guides quoting 19-25 °C clash with the November ten-year range of 26.9-30.9 °C, so skip those figures when planning.
Water Temperature by Month
Published monthly datasets give a clear picture at the extremes. January is the coolest month in the data, and May is the warmest. Auto-aggregated pages can carry glitches, and one May table shows a -10 °C cell for 1 May 2026. Reading ranges is safer than reading single days. A ten-year range for the current month on seatemperature.info shows Pattaya between about 26.9 °C and 30.9 °C (80-88 °F). Months between January and May fall between these bounds.
| Month | Typical sea temperature | Gear suggestion | Trade-off |
|---|---|---|---|
| January | 25-30 °C (77-86 °F), average 27 °C | Rash vest; 3 mm shorty on windy days | Coolest water of the year, but only 16 mm of rain |
| May | 28-32 °C (82-90 °F), average 31 °C | Rash vest or no suit | Warmest water, but about 166 mm of rain and 33 °C daytime air |
| November (ten-year range) | About 26.9-30.9 °C (80-88 °F) | Rash vest | Cool-season start; widest swing in the data |
Is the Water Warm Enough? What to Wear Diving or Snorkeling
Yes for swimming in every month. Thai Tec Diver dives in a rash vest all year. On a cooler day, with wind, rain or no sun, the same diver adds a 3 mm shorty. That is general guidance, not a rule, and thin skins suit most recreational divers. Longer dives and repeated dives can chill people who run cold. A 3 mm shorty covers that case. Snorkelers float at the warmest layer, so a rash vest mainly protects against sun in 31 °C (88 °F) water. Children lose heat faster, so a shorty helps during longer sessions. Full-length cold-water suits are rarely needed. Our Pattaya snorkeling guide covers gear for the surface.
- Snorkeling: rash vest for sun, plus reef-safe sunscreen on exposed skin.
- Recreational diving: rash vest, or a 3 mm shorty from December to February.
- Long technical dives: a 3 mm shorty adds comfort on a cool or windy day.
- Kids: a shorty for sessions of 45 minutes or more.
Surface vs Depth: Do Wrecks and Dive Sites Feel Different?
Only slightly. Thai Tec Diver reports that even at 80 m (262 ft) the water may drop by only 1 °C (about 2 °F). Most recreational wreck dives stay far shallower, around 20-30 m (66-98 ft), so a thick suit is unnecessary. Surface readings from satellites and readings at depth can differ a little. The gap is small compared with cold-water destinations. Divers planning Pattaya Wreck Diving: Mataphon, Hardeep & Who Should Go should still bring a layer for long surface intervals after a boat ride. Wind makes a wet diver feel colder than the thermometer says. Training for deeper wrecks starts with the PADI Wreck Diver specialty.
Pattaya Beach vs Koh Larn: Any Difference in Water Temperature?
No published source separates them. Monthly datasets list Jomtien Beach and Ko Lan only as nearby locations without a different figure. Expect the same warm range at both, and let wind and waves decide the comfort level. Snorkelers choosing the island can read our Koh Larn snorkeling guide. Your boat operator can say whether water was noticeably cooler on recent trips.
Best Time to Go Based on Water and Conditions
Match the month to your priority. Warmest water points to April-May, with 28-32 °C (82-90 °F) in May. Driest weather points to January, with about 16 mm of rain against about 166 mm in May. Coolest water, still comfortable, is also January. Visibility changes with season and weather, but no measured figures are available here, so ask a dive center. Individual sites vary, and our Pattaya Dive Sites: Best Spots, Wrecks and Season Guide page helps you compare them.
Choosing January means a 3 mm shorty from December to February for recreational dives, while May often needs just a rash vest or no suit.
- Warmest water: April-May.
- Least rain: January.
- Fewest layers needed: May.
- Best diving conditions: ask an operator close to your dates.
How to Check Conditions Before You Book
Skip the single "today" widget. A live reading is a surface snapshot and can swing from day to day. Message your operator a few days before and ask about water, wind and current. A local Pattaya Dive Center Guide: How to Choose, What to Ask, Costs answers this daily. Course students can ask the same of PADI Pattaya: Courses, Dive Trips & Costs Guide operators. Pack sun protection, since 31 °C (88 °F) water still comes with strong sun.
For trip-planning details, see DAN: Divers Alert Network.
Frequently Asked Questions
What is the current water temperature in Thailand?
Live readings change daily, so check a current tool or ask a local operator. Gulf of Thailand coastal readings usually sit near 27-31 °C (81-88 °F). Pattaya's ten-year range for the current month is about 26.9-30.9 °C.
How hot is it in Pattaya?
Average daytime air temperature is about 31 °C (88 °F) in January and 33 °C (91 °F) in May. Nights average about 23 °C in January and 26 °C in May.
Notes for your next dive trip
Optional updates to our Thai diving guides.
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