Climate averages 1991–2020
São Mateus weather
by month.
See how the year changes. February has the highest average daily maximum; August has the lowest average monthly rainfall.
Long-term climate patterns, not a forecast for a particular trip.
Across the year São Mateus averages a daytime high of 27.5°C and a nighttime low of 21.2°C, with about 1,133 mm of rain on roughly 170 days. February is the warmest month (average high 29.9°C) and July the coolest (24.9°C). November is the wettest month with 183 mm; August is the driest with 48 mm.
The annual picture
A year in São Mateus
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 | 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
Nearby cities
- LinharesBrazil · 78 kmHigh 27.9°C · Low 20.8°C · 1,078 mm rain a year
- ColatinaBrazil · 122 kmHigh 28.5°C · Low 20.5°C · 790 mm rain a year
- AracruzBrazil · 130 kmHigh 27.6°C · Low 20.3°C · 1,062 mm rain a year
- Teixeira de FreitasBrazil · 132 kmHigh 28.3°C · Low 20.6°C · 855 mm rain a year
- SerraBrazil · 164 kmHigh 26.6°C · Low 20.7°C · 1,029 mm rain a year
- CariacicaBrazil · 181 kmHigh 26.4°C · Low 20.5°C · 1,387 mm rain a year
- Vila VelhaBrazil · 185 kmHigh 26.5°C · Low 21.3°C · 1,029 mm rain a year
- Viana, BrazilBrazil · 197 kmHigh 27.3°C · Low 20.7°C · 1,271 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -18.70°, -39.90° (5 km from the city centre). Rain comes from the 0.25° cell at -18.75°, -39.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.