Petrolina weather in September
In September, Petrolina has daytime highs averaging 32 °C, nights around 20 °C, with 0.2 wet days. Figures are 1991–2020 climate normals.
- 32.3°C Average high
- 20.3°C Average low
- 0.2days Wet days
- 1mm Rainfall
- 12h Daylight
Daily temperatures through September
How September develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 September | 31.6 °C | 19.9 °C | 1 % |
| 11–20 September | 32.1 °C | 20.2 °C | 1 % |
| 21–30 September | 33.3 °C | 20.9 °C | 1 % |
- Average highs rise from 31.6 °C early in September to 33.3 °C by the end of it.
What to expect
| Measure | Typical September | Share of the month |
|---|---|---|
| Days above 25 °C | 30 of 30 | 100 % |
| Days above 30 °C | 26 of 30 | 85 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 0.2 of 30 | 1 % |
Conditions in September
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 37 °C |
| Record low (1991–2020) | 16 °C |
| Relative humidity | 52 % |
| Wind speed | 25 km/h |
| Cloud cover | 35 % |
Where Petrolina ranks in September
| Ranking | Position | Value |
|---|---|---|
| The driest places in South America in September | 22ndof 50 | 1.4 mm |
| The warmest places in South America in September | 39thof 50 | 32 °C |
September compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| July | 29.0 °C | 3 mm | 50 % |
| August | 30.1 °C | 1 mm | 43 % |
| September | 32.3 °C | 1 mm | 35 % |
| October | 33.9 °C | 13 mm | 38 % |
| November | 33.7 °C | 33 mm | 54 % |
See all twelve months for Petrolina
- September is the 5th warmest month here.
- It is the 1st driest month of the year.
- It ranks 1st for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 0.2 of 30 days — 1 % of the month.
- Nights are about 12 °C cooler than the middle of the day.
- The hottest September day on record since 1991 reached 37 °C, 4.8 °C above the usual daytime high.
QuestionsSeptember in Petrolina, answered
How warm is Petrolina in September?
Daily highs average 32 °C and nights fall to about 20 °C, a spread of 12 °C between afternoon and dawn. That makes September the 8th warmest month of the year here.
Does it rain much in Petrolina in September?
September averages 1 mm of rain, spread over about 0 of the 30 days — 1 % of the month. Cloud cover averages 35 % of the sky.
How long are the days in September?
Petrolina averages 12 hours between sunrise and sunset in September. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.