Climate averages 1991–2020
Petrolina weather
in May.
A hot, very dry month: the 9th warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Petrolina: daytime highs average 31.0°C and nights cool to about 21.8°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 10 mm of rain on roughly 2 days, which makes May a very dry month (the joint 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 41 min on an average May day.
The nearest other city in this atlas is Casa Nova (58 km away). In May its highs average 31.3°C, about as warm as Petrolina, with 10 mm of rain.
Among the 448 cities listed in Brazil, Petrolina ranks joint 8th of 448 for the warmest May highs and joint 4th of 448 for the driest May (rainfall, lowest first). The mean May high of those 448 cities is 25.3°C; Petrolina is 5.7°C warmer than that mean.
From May to June, average highs fall by 1.4°C to 29.5°C, and monthly rainfall falls from 10 mm to 3.4 mm.
The annual picture
May 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, selected | 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 | 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
May in nearby cities
- Casa Nova in MayBrazil · 58 kmHigh 31.3°C · Low 22.5°C · 10 mm rain
- Senhor do Bonfim in MayBrazil · 123 kmHigh 26.3°C · Low 19.3°C · 58 mm rain
- Campo Formoso in MayBrazil · 125 kmHigh 26.4°C · Low 19.5°C · 58 mm rain
- Jacobina in MayBrazil · 198 kmHigh 26.5°C · Low 19.9°C · 49 mm rain
- Araripina in MayBrazil · 203 kmHigh 28.3°C · Low 20.3°C · 37 mm rain
- Paulo Afonso in MayBrazil · 251 kmHigh 29.8°C · Low 21.7°C · 30 mm rain
- Irecê in MayBrazil · 259 kmHigh 28.7°C · Low 19.4°C · 11 mm rain
- Crato in MayBrazil · 269 kmHigh 29.6°C · Low 21.8°C · 44 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.