Climate averages 1991–2020
Petrópolis weather
in August.
A warm, moderately wet month: the 9th warmest and the 3rd driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Petrópolis: daytime highs average 22.5°C and nights cool to about 13.5°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 42 mm of rain on roughly 7 days, which makes August a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 20 min on an average August day.
The nearest other city in this atlas is Magé (22 km away). In August its highs average 25.3°C, 2.8°C warmer than Petrópolis, with 44 mm of rain.
Among the 448 cities listed in Brazil, Petrópolis ranks joint 370th of 448 for the warmest August highs and joint 276th of 448 for the driest August (rainfall, lowest first). The mean August high of those 448 cities is 26.2°C; Petrópolis is 3.7°C cooler than that mean.
From August to September, average highs rise by 1.3°C to 23.8°C, and monthly rainfall rises from 42 mm to 88 mm.
The annual picture
August 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
Petrópolis climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.9°C19.6°C | 19.6°C | 315 | 22.9 | 13.313 h |
| February | 27.3°C19.6°C | 19.6°C | 233 | 18.5 | 12.913 h |
| March | 25.9°C19.0°C | 19.0°C | 244 | 22.0 | 12.212 h |
| April | 24.3°C17.4°C | 17.4°C | 105 | 14.0 | 11.612 h |
| May | 22.0°C14.8°C | 14.8°C | 70 | 10.9 | 11.111 h |
| June | 21.6°C13.6°C | 13.6°C | 41 | 7.0 | 10.811 h |
| July | 21.4°C13.0°C | 13.0°C | 39 | 6.6 | 10.911 h |
| August, selected | 22.5°C13.5°C | 13.5°C | 42 | 7.2 | 11.311 h |
| September | 23.8°C15.1°C | 15.1°C | 88 | 10.8 | 11.912 h |
| October | 24.8°C16.7°C | 16.7°C | 137 | 15.1 | 12.613 h |
| November | 24.6°C17.5°C | 17.5°C | 252 | 20.0 | 13.213 h |
| December | 26.1°C18.9°C | 18.9°C | 295 | 23.2 | 13.513 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
August in nearby cities
- Magé in AugustBrazil · 22 kmHigh 25.3°C · Low 16.0°C · 44 mm rain
- Teresópolis in AugustBrazil · 23 kmHigh 21.8°C · Low 12.9°C · 49 mm rain
- Duque de Caxias in AugustBrazil · 34 kmHigh 26.1°C · Low 16.7°C · 44 mm rain
- Belford Roxo in AugustBrazil · 37 kmHigh 26.3°C · Low 16.8°C · 32 mm rain
- São Gonçalo in AugustBrazil · 38 kmHigh 25.3°C · Low 16.8°C · 44 mm rain
- Nova Iguaçu in AugustBrazil · 40 kmHigh 26.4°C · Low 16.4°C · 32 mm rain
- Itaboraí in AugustBrazil · 42 kmHigh 24.9°C · Low 15.8°C · 43 mm rain
- Três Rios in AugustBrazil · 43 kmHigh 25.5°C · Low 15.3°C · 21 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 Petrópolis) is explained once on the Petrópolis year overview and on the Sources, method and limits page.