Tonalá, Chiapas climate

Aw Tropical savanna (dry winter)

Tonalá has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is May with an average daily high near 37°C, while the coldest is January averaging around 20°C at night. Precipitation totals about 1657 mm a year and is strongly seasonal — June alone averages 363 mm while January barely receives 1 mm.

☀️ All year

Very hot

Daytime highs near 37°C most of the year.

🌙 Nights

Stays warm

Even the coolest nights stay near 20°C.

🌧️ Rain

Very wet

About 1657 mm of rain a year.

Wettest in June

⛅ Sky & trend

Partly cloudy

A roughly even mix of sun and cloud.

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)

Tonalá climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	33	35	36	37	37	35	36	36	35	34	34	33
Avg temp (°C)	27	27	29	30	30	29	29	29	29	28	28	27
Avg low (°C)	20	20	21	22	23	23	23	23	23	23	22	21
Precipitation (mm)	1	3	4	27	155	363	249	306	359	147	39	2

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	33	35	36	37	37	35
Avg temp (°C)	27	27	29	30	30	29
Avg low (°C)	20	20	21	22	23	23
Precipitation (mm)	1	3	4	27	155	363

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	36	36	35	34	34	33
Avg temp (°C)	29	29	29	28	28	27
Avg low (°C)	23	23	23	23	22	21
Precipitation (mm)	249	306	359	147	39	2

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	45	40	36	40	60	77	72	73	80	67	50	44
Relative humidity (%)	68	65	62	64	70	80	80	82	85	83	79	73
Wind speed (km/h)	15.5	13.7	12.7	11.3	9.0	7.3	6.7	6.9	7.5	10.9	14.6	14.5

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	45	40	36	40	60	77
Relative humidity (%)	68	65	62	64	70	80
Wind speed (km/h)	15.5	13.7	12.7	11.3	9.0	7.3

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	72	73	80	67	50	44
Relative humidity (%)	80	82	85	83	79	73
Wind speed (km/h)	6.7	6.9	7.5	10.9	14.6	14.5

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from CONAGUA / SMN, Mexico's national weather service, measured at Arriaga (dge), about 24 km from the city centre.

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 →