Rayong, Thailand climate

Aw Tropical savanna (dry winter)

Rayong has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 34°C, while the coldest is January averaging around 21°C at night. Precipitation totals about 1363 mm a year and is strongly seasonal — October alone averages 280 mm while February barely receives 11 mm.

☀️ All year

Hot

Daytime highs near 34°C most of the year.

About 259 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 21°C.

🌧️ Rain

Wet

About 1363 mm of rain a year.

Wettest in October

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

+0.5 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Hours of sunshine per day

Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)

Rayong climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	32	33	33	34	34	34	33	33	33	33	33	33
Avg temp (°C)	27	28	29	30	30	30	29	29	29	28	28	27
Avg low (°C)	21	23	25	26	26	26	26	26	25	24	23	21
Precipitation (mm)	22	11	46	90	154	167	154	118	238	280	67	16

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	32	33	33	34	34	34
Avg temp (°C)	27	28	29	30	30	30
Avg low (°C)	21	23	25	26	26	26
Precipitation (mm)	22	11	46	90	154	167

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	33	33	33	33	33
Avg temp (°C)	29	29	29	28	28	27
Avg low (°C)	26	26	25	24	23	21
Precipitation (mm)	154	118	238	280	67	16

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	4	3	5	6	12	14	13	13	17	18	7	3
Days with high ≥ 32°C (days)	19	19	23	24	25	23	22	23	20	20	21	21

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	4	3	5	6	12	14
Days with high ≥ 32°C (days)	19	19	23	24	25	23

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	13	13	17	18	7	3
Days with high ≥ 32°C (days)	22	23	20	20	21	21

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	48	42	52	63	84	89	90	92	91	82	63	54
Relative humidity (%)	71	74	77	77	80	82	82	83	83	81	77	73
Wind speed (km/h)	11.6	12.3	13.1	12.5	14.1	17.0	18.0	17.7	14.3	11.3	13.8	14.6

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	48	42	52	63	84	89
Relative humidity (%)	71	74	77	77	80	82
Wind speed (km/h)	11.6	12.3	13.1	12.5	14.1	17.0

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	90	92	91	82	63	54
Relative humidity (%)	82	83	83	81	77	73
Wind speed (km/h)	18.0	17.7	14.3	11.3	13.8	14.6

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Sattahip, a weather station, about 30 km from the city centre. The underlying daily records come from NOAA's global station network.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →