Climate averages 1991–2020
Ji Paraná weather
in September.
A hot, moderately wet month: the 2nd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Ji Paraná: daytime highs average 33.3°C and nights cool to about 23.2°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 80 mm of rain on roughly 13 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 02 min on an average September day.
The nearest other city in this atlas is Cacoal (83 km away). In September its highs average 33.3°C, about as warm as Ji Paraná, with 90 mm of rain.
Among the 448 cities listed in Brazil, Ji Paraná ranks joint 40th of 448 for the warmest September highs and joint 290th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Ji Paraná is 5.8°C warmer than that mean.
From September to October, average highs fall by 1.2°C to 32.1°C, and monthly rainfall rises from 80 mm to 143 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
Ji Paraná climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C22.8°C | 22.8°C | 270 | 28.5 | 12.713 h |
| February | 28.9°C22.8°C | 22.8°C | 263 | 26.4 | 12.512 h |
| March | 29.2°C22.8°C | 22.8°C | 241 | 27.8 | 12.212 h |
| April | 29.2°C22.6°C | 22.6°C | 148 | 22.2 | 11.912 h |
| May | 29.2°C21.8°C | 21.8°C | 78 | 14.3 | 11.612 h |
| June | 30.5°C20.9°C | 20.9°C | 18 | 3.7 | 11.511 h |
| July | 32.2°C20.8°C | 20.8°C | 11 | 2.0 | 11.512 h |
| August | 33.6°C21.9°C | 21.9°C | 23 | 4.5 | 11.812 h |
| September, selected | 33.3°C23.2°C | 23.2°C | 80 | 13.4 | 12.012 h |
| October | 32.1°C23.3°C | 23.3°C | 143 | 19.8 | 12.312 h |
| November | 30.4°C23.1°C | 23.1°C | 212 | 24.3 | 12.613 h |
| December | 29.5°C23.0°C | 23.0°C | 248 | 26.7 | 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
- Cacoal in SeptemberBrazil · 83 kmHigh 33.3°C · Low 23.0°C · 90 mm rain
- Ariquemes in SeptemberBrazil · 161 kmHigh 33.1°C · Low 23.3°C · 86 mm rain
- Vilhena in SeptemberBrazil · 285 kmHigh 30.8°C · Low 20.9°C · 84 mm rain
- Porto Velho in SeptemberBrazil · 319 kmHigh 32.6°C · Low 23.8°C · 103 mm rain
- Riberalta in SeptemberBolivia · 448 kmHigh 32.2°C · Low 23.1°C · 84 mm rain
- Trinidad in SeptemberBolivia · 543 kmHigh 31.2°C · Low 22.2°C · 106 mm rain
- Tangará da Serra in SeptemberBrazil · 638 kmHigh 32.3°C · Low 21.2°C · 56 mm rain
- Rio Branco in SeptemberBrazil · 649 kmHigh 32.4°C · Low 22.7°C · 76 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 Ji Paraná) is explained once on the Ji Paraná year overview and on the Sources, method and limits page.