Climate averages 1991–2020
Itanhaém 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 Itanhaém: daytime highs average 23.8°C and nights cool to about 17.2°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 141 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 Praia Grande (44 km away). In September its highs average 24.3°C, about as warm as Itanhaém, with 126 mm of rain.
Among the 448 cities listed in Brazil, Itanhaém ranks joint 367th of 448 for the warmest September highs and joint 394th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Itanhaém is 3.7°C cooler than that mean.
From September to October, average highs rise by 1.2°C to 24.9°C, and monthly rainfall rises from 141 mm to 155 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
Itanhaém climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.3°C22.7°C | 22.7°C | 227 | 22.9 | 13.413 h |
| February | 28.6°C22.8°C | 22.8°C | 213 | 19.8 | 12.913 h |
| March | 27.6°C22.1°C | 22.1°C | 212 | 21.5 | 12.212 h |
| April | 26.4°C20.4°C | 20.4°C | 137 | 14.5 | 11.512 h |
| May | 24.1°C17.8°C | 17.8°C | 125 | 13.6 | 11.011 h |
| June | 23.4°C16.4°C | 16.4°C | 101 | 10.1 | 10.711 h |
| July | 22.8°C15.6°C | 15.6°C | 107 | 10.3 | 10.811 h |
| August | 23.1°C15.8°C | 15.8°C | 88 | 10.2 | 11.311 h |
| September, selected | 23.8°C17.2°C | 17.2°C | 141 | 14.2 | 11.912 h |
| October | 24.9°C18.8°C | 18.8°C | 155 | 17.0 | 12.613 h |
| November | 25.7°C19.8°C | 19.8°C | 163 | 16.9 | 13.313 h |
| December | 27.4°C21.5°C | 21.5°C | 174 | 19.2 | 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
- Praia Grande in SeptemberBrazil · 44 kmHigh 24.3°C · Low 17.8°C · 126 mm rain
- São Vicente in SeptemberBrazil · 47 kmHigh 24.5°C · Low 17.9°C · 126 mm rain
- Itapecerica da Serra in SeptemberBrazil · 52 kmHigh 22.5°C · Low 13.3°C · 108 mm rain
- Santos in SeptemberBrazil · 52 kmHigh 24.0°C · Low 18.0°C · 142 mm rain
- São Bernardo do Campo in SeptemberBrazil · 59 kmHigh 23.0°C · Low 14.2°C · 129 mm rain
- Embu das Artes in SeptemberBrazil · 60 kmHigh 24.0°C · Low 14.4°C · 108 mm rain
- Taboão da Serra in SeptemberBrazil · 62 kmHigh 23.7°C · Low 14.1°C · 108 mm rain
- Santo André in SeptemberBrazil · 63 kmHigh 23.0°C · Low 14.5°C · 129 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 Itanhaém) is explained once on the Itanhaém year overview and on the Sources, method and limits page.