Climate averages 1991–2020
Santos weather
in September.
A warm, wet month: the 9th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Santos: daytime highs average 24.0°C and nights cool to about 18.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 142 mm of rain on roughly 14 days, which makes September a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 56 min on an average September day.
The nearest other city in this atlas is São Vicente (6 km away). In September its highs average 24.5°C, 0.6°C warmer than Santos, with 126 mm of rain.
Among the 448 cities listed in Brazil, Santos ranks joint 360th of 448 for the warmest September highs and joint 397th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Santos is 3.6°C cooler than that mean.
From September to October, average highs rise by 1.0°C to 25.0°C, and monthly rainfall rises from 142 mm to 158 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
Santos climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.4°C23.3°C | 23.3°C | 225 | 20.7 | 13.413 h |
| February | 28.7°C23.5°C | 23.5°C | 202 | 17.4 | 12.913 h |
| March | 27.7°C22.8°C | 22.8°C | 206 | 19.4 | 12.212 h |
| April | 26.5°C21.2°C | 21.2°C | 127 | 13.2 | 11.512 h |
| May | 24.4°C18.7°C | 18.7°C | 125 | 12.7 | 11.011 h |
| June | 23.8°C17.4°C | 17.4°C | 97 | 10.1 | 10.711 h |
| July | 23.2°C16.6°C | 16.6°C | 115 | 9.9 | 10.811 h |
| August | 23.4°C16.8°C | 16.8°C | 94 | 10.2 | 11.311 h |
| September, selected | 24.0°C18.0°C | 18.0°C | 142 | 14.1 | 11.912 h |
| October | 25.0°C19.4°C | 19.4°C | 158 | 16.1 | 12.613 h |
| November | 25.6°C20.4°C | 20.4°C | 174 | 16.7 | 13.313 h |
| December | 27.4°C22.2°C | 22.2°C | 179 | 18.0 | 13.614 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
- São Vicente in SeptemberBrazil · 6 kmHigh 24.5°C · Low 17.9°C · 126 mm rain
- Praia Grande in SeptemberBrazil · 9 kmHigh 24.3°C · Low 17.8°C · 126 mm rain
- Ribeirão Pires in SeptemberBrazil · 29 kmHigh 23.2°C · Low 14.8°C · 129 mm rain
- São Bernardo do Campo in SeptemberBrazil · 38 kmHigh 23.0°C · Low 14.2°C · 129 mm rain
- Santo André in SeptemberBrazil · 39 kmHigh 23.0°C · Low 14.5°C · 129 mm rain
- São Caetano do Sul in SeptemberBrazil · 44 kmHigh 23.7°C · Low 14.4°C · 90 mm rain
- Ferraz de Vasconcelos in SeptemberBrazil · 47 kmHigh 24.1°C · Low 14.6°C · 89 mm rain
- Mogi das Cruzes in SeptemberBrazil · 51 kmHigh 23.7°C · Low 14.2°C · 89 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 Santos) is explained once on the Santos year overview and on the Sources, method and limits page.