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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.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours 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 (m/s) | 4.3 | 3.8 | 3.5 | 3.1 | 2.5 | 2.0 | 1.9 | 1.9 | 2.1 | 3.0 | 4.1 | 4.0 |
| 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 (m/s) | 4.3 | 3.8 | 3.5 | 3.1 | 2.5 | 2.0 |
| 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 (m/s) | 1.9 | 1.9 | 2.1 | 3.0 | 4.1 | 4.0 |
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.