Phuket Weather in September
Phuket in September is warm and very wet: highs of 83°F (29°C), lows of 77°F (25°C), sea at 84°F (29°C) and about 13.1 in (332 mm) of rain for the month. Rating: Mixed — rain is frequent.
Mixedrain is frequent
Climate normals checked September 29, 2026 · Source: Open-Meteo (ERA5) · How we calculate
Phuket climate in September
| Day high | Night low | Sea | Rainy days | Rainfall | Humidity |
|---|---|---|---|---|---|
| 83°F (29°C) | 77°F (25°C) | 84°F (29°C) | 25 | 13.1 in (332 mm) | 86% |
What to know in September
From May to October the southwest monsoon hits the Andaman Sea: big waves and red flags on some beaches, so swimming can be dangerous.
Checked September 29, 2026.
Flight time from the US
We're still checking flight times from JFK, LAX and SFO to Phuket. This block will show them once our flight data is ready.
Other months in Phuket
- Jan85°FJanuary: Excellent
- Feb88°FFebruary: Excellent
- Mar89°FMarch: Excellent
- Apr88°FApril: Mixed
- May86°FMay: Mixed
- Jun85°FJune: Mixed
- Jul84°FJuly: Mixed
- Aug84°FAugust: Mixed
- Sep83°FSeptember: Mixed
- Oct83°FOctober: Mixed
- Nov84°FNovember: Mixed
- Dec84°FDecember: Good
Excellent Good Mixed Off-season
Phuket in September: FAQ
What's the weather like in Phuket in September?
Phuket in September is warm and very wet: highs of 83°F (29°C), lows of 77°F (25°C), sea at 84°F (29°C) and about 13.1 in (332 mm) of rain for the month. Rating: Mixed — rain is frequent.
Is September a good time to visit Phuket?
We rate September as Mixed and October as Mixed. Best months in Phuket: December to March.
Is Phuket better than Bangkok in September?
Phuket: highs of 83°F (29°C) and 13.1 in (332 mm) of rain. Bangkok: 88°F (31°C) and 11.5 in (293 mm). Bangkok is drier.
Where the data comes from
- Air temperature, rainfall, humidity — ERA5 reanalysis (Copernicus / ECMWF) via Open-Meteo, averaged over 2015–2024. Each region uses one point: the resort or city in its caption.
- Sea temperature — Open-Meteo Marine, average sea surface temperature for 2023–2026 (the source has no longer record yet).
- Rainy days — days with at least 1 mm (0.04 in) of rain. Reanalysis picks up light rain more often than weather stations, so treat this as an upper bound.
- Month rating — one rule for every destination, based on three factors: day highs (ideal 75–91°F / 24–33°C), monthly rainfall (ideal under 80 mm / 3.1 in) and, for beach regions, sea temperature (ideal 77°F / 25°C or warmer). All ideal means Excellent; one slightly weaker factor means Good. Mixed means heavy rain (150 mm / 5.9 in or more), highs above 97°F (36°C) or a sea below 70°F (21°C). Off-season means highs of 100°F (38°C) or more, cold below 54°F (12°C), over 350 mm (13.8 in) of rain, or several problems at once. A country's rating follows its best region, so check the regional table.
Checked September 29, 2026. Climate normals are refreshed yearly and the notes every 90 days. These are long-term averages, not a forecast: any given year can differ.
