Climate averages 1991–2020

Rayong weather
in September.

A hot, very wet month: the coolest and the wettest of the year.

Long-term climate patterns, not a forecast for a particular trip.

Average high 29.4°C Daytime mean, September

Average low 25.1°C Night-time mean, September

Rainfall 300 mm 26 days with ≥1 mm

Daylight 12 h Sunrise to sunset, per day

September is a hot month in Rayong: daytime highs average 29.4°C and nights cool to about 25.1°C. By daytime temperature it is the coolest month of the year.

Expect about 300 mm of rain on roughly 26 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 12 min on an average September day.

The nearest other city in this atlas is Pattaya (49 km away). In September its highs average 29.8°C, about as warm as Rayong, with 242 mm of rain.

Among the 46 cities listed in Thailand, Rayong ranks 41st of 46 for the warmest September highs and 43rd of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Rayong is 1.0°C cooler than that mean.

From September to October, average highs rise by 0.1°C to 29.5°C, and monthly rainfall falls from 300 mm to 256 mm.

The annual picture

September in context

30-year average

Average highAverage low°C

Monthly rainfall

Average total · mm

Averages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated

Every month, side by side

Rayong climate table

1991–2020

Monthly climate averages for Rayong, 1991–2020
Month	Average highHigh / low	Average low	Rainfall mm/month	Rain days ≥1 mm/day	Daylight hours/dayDaylight h/day
January	30.4°C22.9°C	22.9°C	28	5.9	11.511 h
February	30.7°C23.9°C	23.9°C	32	6.9	11.712 h
March	31.0°C25.3°C	25.3°C	81	14.2	12.112 h
April	31.4°C26.2°C	26.2°C	133	18.9	12.412 h
May	30.7°C26.2°C	26.2°C	220	24.9	12.713 h
June	30.0°C26.1°C	26.1°C	210	24.5	12.913 h
July	29.7°C25.9°C	25.9°C	206	24.9	12.813 h
August	29.6°C25.7°C	25.7°C	196	24.9	12.513 h
September, selected	29.4°C25.1°C	25.1°C	300	26.4	12.212 h
October	29.5°C24.4°C	24.4°C	256	23.2	11.912 h
November	30.2°C24.0°C	24.0°C	59	8.5	11.612 h
December	30.3°C23.0°C	23.0°C	17	3.3	11.411 h

Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.

Compare places

September in nearby cities

Distance from Rayong

Read the numbers correctly

Climate, not a promise.

These patterns help compare months. They cannot tell you the weather on a specific day of your trip.

Sources, method and limits

How these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Rayong) is explained once on the Rayong year overview and on the Sources, method and limits page.