Climate averages 1991–2020
Vilhena 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 Vilhena: daytime highs average 30.8°C and nights cool to about 20.9°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 84 mm of rain on roughly 14 days, which makes September a moderately wet month (the 5th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 01 min on an average September day.
The nearest other city in this atlas is Cacoal (202 km away). In September its highs average 33.3°C, 2.5°C warmer than Vilhena, with 90 mm of rain.
Among the 448 cities listed in Brazil, Vilhena ranks joint 101st of 448 for the warmest September highs and joint 303rd of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Vilhena is 3.3°C warmer than that mean.
From September to October, average highs fall by 1.3°C to 29.5°C, and monthly rainfall rises from 84 mm to 165 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
Vilhena climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 27.5°C21.0°C | 21.0°C | 267 | 29.4 | 12.813 h |
| February | 27.2°C20.8°C | 20.8°C | 276 | 27.2 | 12.513 h |
| March | 27.5°C20.9°C | 20.9°C | 241 | 28.6 | 12.212 h |
| April | 27.6°C20.4°C | 20.4°C | 128 | 21.4 | 11.812 h |
| May | 27.5°C19.4°C | 19.4°C | 57 | 12.1 | 11.512 h |
| June | 28.3°C18.5°C | 18.5°C | 14 | 3.0 | 11.411 h |
| July | 29.3°C18.2°C | 18.2°C | 10 | 2.1 | 11.411 h |
| August | 31.0°C19.6°C | 19.6°C | 24 | 4.8 | 11.712 h |
| September, selected | 30.8°C20.9°C | 20.9°C | 84 | 13.5 | 12.012 h |
| October | 29.5°C21.2°C | 21.2°C | 165 | 22.4 | 12.412 h |
| November | 28.2°C21.1°C | 21.1°C | 207 | 25.5 | 12.713 h |
| December | 27.7°C21.1°C | 21.1°C | 259 | 28.2 | 12.913 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 · 202 kmHigh 33.3°C · Low 23.0°C · 90 mm rain
- Ji Paraná in SeptemberBrazil · 285 kmHigh 33.3°C · Low 23.2°C · 80 mm rain
- Tangará da Serra in SeptemberBrazil · 355 kmHigh 32.3°C · Low 21.2°C · 56 mm rain
- Ariquemes in SeptemberBrazil · 445 kmHigh 33.1°C · Low 23.3°C · 86 mm rain
- Cáceres, Brazil in SeptemberBrazil · 456 kmHigh 34.0°C · Low 23.1°C · 35 mm rain
- Lucas do Rio Verde in SeptemberBrazil · 460 kmHigh 33.3°C · Low 22.4°C · 50 mm rain
- Sorriso in SeptemberBrazil · 482 kmHigh 33.6°C · Low 22.4°C · 43 mm rain
- Sinop in SeptemberBrazil · 514 kmHigh 33.6°C · Low 22.0°C · 53 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 Vilhena) is explained once on the Vilhena year overview and on the Sources, method and limits page.