Climate averages 1991–2020
Petrolina weather
in September.
A hot, very dry month: the 5th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Petrolina: daytime highs average 32.4°C and nights cool to about 20.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 1.0 mm of rain on fewer than one day, which makes September a very dry month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 03 min on an average September day.
The nearest other city in this atlas is Casa Nova (58 km away). In September its highs average 32.8°C, about as warm as Petrolina, with 1.0 mm of rain.
Among the 448 cities listed in Brazil, Petrolina ranks joint 57th of 448 for the warmest September highs and joint 4th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Petrolina is 4.9°C warmer than that mean.
From September to October, average highs rise by 1.6°C to 34.0°C, and monthly rainfall rises from 1.0 mm to 10 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
Petrolina climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 32.6°C23.0°C | 23.0°C | 80 | 8.7 | 12.613 h |
| February | 32.3°C22.9°C | 22.9°C | 67 | 9.5 | 12.412 h |
| March | 32.1°C22.9°C | 22.9°C | 79 | 10.1 | 12.212 h |
| April | 31.9°C22.6°C | 22.6°C | 32 | 6.0 | 11.912 h |
| May | 31.0°C21.8°C | 21.8°C | 10 | 2.0 | 11.712 h |
| June | 29.5°C20.6°C | 20.6°C | 3.4 | 0.7 | 11.612 h |
| July | 29.0°C19.6°C | 19.6°C | 2.8 | 0.4 | 11.612 h |
| August | 30.1°C19.4°C | 19.4°C | 1.2 | 0.2 | 11.812 h |
| September, selected | 32.4°C20.3°C | 20.3°C | 1.0 | 0.1 | 12.012 h |
| October | 34.0°C21.8°C | 21.8°C | 10 | 1.5 | 12.312 h |
| November | 33.8°C22.8°C | 22.8°C | 32 | 3.9 | 12.513 h |
| December | 33.4°C23.2°C | 23.2°C | 50 | 6.2 | 12.713 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
- Casa Nova in SeptemberBrazil · 58 kmHigh 32.8°C · Low 21.2°C · 1.0 mm rain
- Senhor do Bonfim in SeptemberBrazil · 123 kmHigh 27.1°C · Low 17.7°C · 29 mm rain
- Campo Formoso in SeptemberBrazil · 125 kmHigh 27.0°C · Low 17.8°C · 29 mm rain
- Jacobina in SeptemberBrazil · 198 kmHigh 27.2°C · Low 18.3°C · 29 mm rain
- Araripina in SeptemberBrazil · 203 kmHigh 31.1°C · Low 19.3°C · 1.2 mm rain
- Paulo Afonso in SeptemberBrazil · 251 kmHigh 30.4°C · Low 20.0°C · 10 mm rain
- Irecê in SeptemberBrazil · 259 kmHigh 30.0°C · Low 18.3°C · 2.2 mm rain
- Crato in SeptemberBrazil · 269 kmHigh 32.7°C · Low 21.0°C · 2.1 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 Petrolina) is explained once on the Petrolina year overview and on the Sources, method and limits page.