Climate averages 1991–2020
São Mateus weather
in December.
A hot, wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a hot month in São Mateus: daytime highs average 29.0°C and nights cool to about 22.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 146 mm of rain on roughly 16 days, which makes December a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 14 min on an average December day.
The nearest other city in this atlas is Linhares (78 km away). In December its highs average 29.3°C, about as warm as São Mateus, with 171 mm of rain.
Among the 448 cities listed in Brazil, São Mateus ranks joint 170th of 448 for the warmest December highs and 137th of 448 for the driest December (rainfall, lowest first). The mean December high of those 448 cities is 28.5°C; São Mateus is 0.6°C warmer than that mean.
From December to January, average highs rise by 0.5°C to 29.5°C, and monthly rainfall falls from 146 mm to 106 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
São Mateus climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.5°C23.1°C | 23.1°C | 106 | 13.4 | 13.113 h |
| February | 29.9°C23.1°C | 23.1°C | 77 | 14.2 | 12.713 h |
| March | 29.4°C22.9°C | 22.9°C | 136 | 18.3 | 12.212 h |
| April | 28.1°C22.1°C | 22.1°C | 108 | 17.1 | 11.712 h |
| May | 26.6°C20.6°C | 20.6°C | 70 | 13.2 | 11.211 h |
| June | 25.6°C19.4°C | 19.4°C | 52 | 11.7 | 11.011 h |
| July | 24.9°C18.7°C | 18.7°C | 57 | 13.0 | 11.111 h |
| August | 25.3°C18.8°C | 18.8°C | 48 | 11.1 | 11.511 h |
| September | 26.5°C20.0°C | 20.0°C | 54 | 11.0 | 12.012 h |
| October | 27.6°C21.2°C | 21.2°C | 96 | 13.4 | 12.513 h |
| November | 27.8°C21.9°C | 21.9°C | 183 | 17.7 | 13.013 h |
| December, selected | 29.0°C22.7°C | 22.7°C | 146 | 15.7 | 13.213 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Linhares in DecemberBrazil · 78 kmHigh 29.3°C · Low 22.5°C · 171 mm rain
- Colatina in DecemberBrazil · 122 kmHigh 29.7°C · Low 22.2°C · 168 mm rain
- Aracruz in DecemberBrazil · 130 kmHigh 29.1°C · Low 22.1°C · 177 mm rain
- Teixeira de Freitas in DecemberBrazil · 132 kmHigh 29.8°C · Low 22.2°C · 116 mm rain
- Serra in DecemberBrazil · 164 kmHigh 28.1°C · Low 22.4°C · 156 mm rain
- Cariacica in DecemberBrazil · 181 kmHigh 27.9°C · Low 22.2°C · 227 mm rain
- Vila Velha in DecemberBrazil · 185 kmHigh 27.9°C · Low 22.9°C · 156 mm rain
- Viana, Brazil in DecemberBrazil · 197 kmHigh 28.8°C · Low 22.6°C · 206 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for São Mateus) is explained once on the São Mateus year overview and on the Sources, method and limits page.