Ratchaburi, Thailand climate

Aw Tropical savanna (dry winter)

Ratchaburi has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 93°F, while the coldest is January averaging around 71°F at night. Precipitation totals about 38 inches a year and is strongly seasonal — October alone averages 10.3 inches while February barely receives 0.15 inches.

☀️ All year

Hot

Daytime highs near 93°F most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 71°F.

🌧️ Rain

Moderate rainfall

About 38 in of rain a year.

Wettest in October

⛅ Sky & trend

Often cloudy

Cloudy skies much of the year.

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)

Ratchaburi climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	87	89	90	93	93	92	91	91	91	89	89	87
Avg temp (°F)	79	81	84	86	86	86	85	85	84	83	82	79
Avg low (°F)	71	74	77	79	79	79	78	78	77	76	75	71
Precipitation (in)	0.7	0.1	1.5	1.6	3.8	3.5	3.5	3.6	6.1	10.3	2.6	0.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°F)	87	89	90	93	93	92
Avg temp (°F)	79	81	84	86	86	86
Avg low (°F)	71	74	77	79	79	79
Precipitation (in)	0.7	0.1	1.5	1.6	3.8	3.5

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°F)	91	91	91	89	89	87
Avg temp (°F)	85	85	84	83	82	79
Avg low (°F)	78	78	77	76	75	71
Precipitation (in)	3.5	3.6	6.1	10.3	2.6	0.5

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 (%)	72	70	70	70	75	77	78	78	81	83	80	74
Wind speed (mph)	5.3	6.1	6.5	6.2	5.7	6.2	6.6	6.4	5.0	4.8	5.9	6.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	48	42	52	63	84	89
Relative humidity (%)	72	70	70	70	75	77
Wind speed (mph)	5.3	6.1	6.5	6.2	5.7	6.2

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	90	92	91	82	63	54
Relative humidity (%)	78	78	81	83	80	74
Wind speed (mph)	6.6	6.4	5.0	4.8	5.9	6.1

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 27 years of daily observations at Phetchaburi, a weather station, about 66 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 →