Climate averages 1991–2020
Mossoró weather
in September.
A very hot, very dry month: the joint 2nd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a very hot month in Mossoró: daytime highs average 34.9°C and nights cool to about 23.1°C. By daytime temperature it is the joint 2nd warmest of the 12 months.
Rain is very rare: less than 1 mm falls in a typical September (the driest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 04 min on an average September day.
The nearest other city in this atlas is Russas (75 km away). In September its highs average 35.2°C, about as warm as Mossoró, with 1.2 mm of rain.
Among the 448 cities listed in Brazil, Mossoró ranks joint 10th of 448 for the warmest September highs and 3rd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Mossoró is 7.4°C warmer than that mean.
From September to October, average highs rise by 0.2°C to 35.2°C, and monthly rainfall rises from under 1 mm to 2.1 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
Mossoró climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 33.2°C24.4°C | 24.4°C | 68 | 12.0 | 12.412 h |
| February | 32.6°C24.2°C | 24.2°C | 84 | 13.4 | 12.312 h |
| March | 31.8°C24.1°C | 24.1°C | 127 | 18.3 | 12.112 h |
| April | 31.6°C23.9°C | 23.9°C | 117 | 16.6 | 12.012 h |
| May | 32.2°C23.9°C | 23.9°C | 56 | 8.9 | 11.912 h |
| June | 32.2°C23.3°C | 23.3°C | 29 | 5.9 | 11.812 h |
| July | 32.5°C22.7°C | 22.7°C | 18 | 3.0 | 11.812 h |
| August | 34.0°C22.7°C | 22.7°C | 2.8 | 0.5 | 11.912 h |
| September, selected | 34.9°C23.1°C | 23.1°C | 0.9 | 0.2 | 12.112 h |
| October | 35.2°C23.6°C | 23.6°C | 2.1 | 0.2 | 12.212 h |
| November | 34.9°C24.0°C | 24.0°C | 3.1 | 0.5 | 12.312 h |
| December | 34.4°C24.4°C | 24.4°C | 16 | 4.1 | 12.412 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
- Russas in SeptemberBrazil · 75 kmHigh 35.2°C · Low 23.1°C · 1.2 mm rain
- Cascavel, Brazil in SeptemberBrazil · 154 kmHigh 30.2°C · Low 24.2°C · 2.5 mm rain
- Pacajus in SeptemberBrazil · 167 kmHigh 32.9°C · Low 23.3°C · 2.6 mm rain
- Horizonte in SeptemberBrazil · 175 kmHigh 32.4°C · Low 23.3°C · 3.7 mm rain
- Quixadá in SeptemberBrazil · 187 kmHigh 34.4°C · Low 23.1°C · 1.3 mm rain
- Eusébio in SeptemberBrazil · 189 kmHigh 31.2°C · Low 24.1°C · 3.7 mm rain
- Pacatuba in SeptemberBrazil · 195 kmHigh 32.5°C · Low 23.7°C · 3.7 mm rain
- Maracanaú in SeptemberBrazil · 204 kmHigh 31.9°C · Low 24.0°C · 2.6 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 Mossoró) is explained once on the Mossoró year overview and on the Sources, method and limits page.