Roi Et, Thailand climate

Aw Tropical savanna (dry winter)

Roi Et has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is April with an average daily high near 36°C, while the coldest is December averaging around 18°C at night. Precipitation totals about 1390 mm a year and is strongly seasonal — August alone averages 281 mm while December barely receives 4 mm.

☀️ All year

Very hot

Daytime highs near 36°C most of the year.

About 208 days a year above 32 °C

🌙 Nights

Stays warm

Even the coolest nights stay near 18°C.

🌧️ Rain

Wet

About 1390 mm of rain a year.

Wettest in August

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

+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)

Roi Et climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	31	33	35	36	35	34	33	32	32	32	31	30
Avg temp (°C)	24	26	29	30	30	30	29	28	28	27	26	24
Avg low (°C)	18	19	23	25	25	25	25	25	24	23	20	18
Precipitation (mm)	6	18	28	71	189	207	231	281	261	80	13	4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	31	33	35	36	35	34
Avg temp (°C)	24	26	29	30	30	30
Avg low (°C)	18	19	23	25	25	25
Precipitation (mm)	6	18	28	71	189	207

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	32	32	32	31	30
Avg temp (°C)	29	28	28	27	26	24
Avg low (°C)	25	25	24	23	20	18
Precipitation (mm)	231	281	261	80	13	4

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	1	2	4	7	15	15	17	18	18	9	2	0.8
Days with high ≥ 32°C (days)	10	17	24	26	27	23	20	16	14	14	11	7

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	1	2	4	7	15	15
Days with high ≥ 32°C (days)	10	17	24	26	27	23

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	17	18	18	9	2	0.8
Days with high ≥ 32°C (days)	20	16	14	14	11	7

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	31	35	46	58	78	86	88	91	82	57	41	32
Relative humidity (%)	58	51	50	57	73	82	85	88	88	85	78	67
Wind speed (m/s)	3.0	2.8	2.5	2.1	2.0	2.4	2.5	2.3	1.7	2.1	2.7	3.2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	31	35	46	58	78	86
Relative humidity (%)	58	51	50	57	73	82
Wind speed (m/s)	3.0	2.8	2.5	2.1	2.0	2.4

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	88	91	82	57	41	32
Relative humidity (%)	85	88	88	85	78	67
Wind speed (m/s)	2.5	2.3	1.7	2.1	2.7	3.2

Methodology & sources

Temperature & precipitation — 1991–2020 normals computed from 29 years of daily observations at Roi ET, a weather station, about 3 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 →