Climate averages 1991–2020
São Mateus weather
in September.
A warm, moderately wet month: the 9th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in São Mateus: daytime highs average 26.5°C and nights cool to about 20.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 54 mm of rain on roughly 11 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 59 min on an average September day.
The nearest other city in this atlas is Linhares (78 km away). In September its highs average 27.2°C, 0.6°C warmer than São Mateus, with 45 mm of rain.
Among the 448 cities listed in Brazil, São Mateus ranks joint 264th of 448 for the warmest September highs and joint 186th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; São Mateus is 1.0°C cooler than that mean.
From September to October, average highs rise by 1.1°C to 27.6°C, and monthly rainfall rises from 54 mm to 96 mm.
The annual picture
September 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, selected | 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
September in nearby cities
- Linhares in SeptemberBrazil · 78 kmHigh 27.2°C · Low 19.3°C · 45 mm rain
- Colatina in SeptemberBrazil · 122 kmHigh 28.2°C · Low 19.2°C · 21 mm rain
- Aracruz in SeptemberBrazil · 130 kmHigh 26.7°C · Low 18.9°C · 40 mm rain
- Teixeira de Freitas in SeptemberBrazil · 132 kmHigh 27.4°C · Low 19.2°C · 33 mm rain
- Serra in SeptemberBrazil · 164 kmHigh 25.5°C · Low 19.3°C · 50 mm rain
- Cariacica in SeptemberBrazil · 181 kmHigh 25.3°C · Low 19.0°C · 66 mm rain
- Vila Velha in SeptemberBrazil · 185 kmHigh 25.3°C · Low 19.8°C · 50 mm rain
- Viana, Brazil in SeptemberBrazil · 197 kmHigh 26.2°C · Low 19.2°C · 63 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.