Climate averages 1991–2020
Riberalta weather
in September.
A hot, moderately wet month: the 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 Riberalta: daytime highs average 32.2°C and nights cool to about 23.1°C. By daytime temperature it is the warmest month of the year.
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 02 min on an average September day.
The nearest other city in this atlas is Rio Branco (224 km away). In September its highs average 32.4°C, about as warm as Riberalta, with 76 mm of rain.
Among the 14 cities listed in Bolivia, Riberalta ranks 1st of 14 for the warmest September highs and 12th of 14 for the driest September (rainfall, lowest first). The mean September high of those 14 cities is 22.6°C; Riberalta is 9.6°C warmer than that mean.
From September to October, average highs fall by 0.8°C to 31.4°C, and monthly rainfall rises from 84 mm to 159 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
Riberalta climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.6°C23.4°C | 23.4°C | 269 | 27.7 | 12.713 h |
| February | 29.4°C23.3°C | 23.3°C | 260 | 25.4 | 12.512 h |
| March | 29.4°C23.3°C | 23.3°C | 255 | 27.8 | 12.212 h |
| April | 29.1°C22.9°C | 22.9°C | 174 | 23.3 | 11.912 h |
| May | 28.5°C22.0°C | 22.0°C | 81 | 15.7 | 11.612 h |
| June | 28.9°C21.3°C | 21.3°C | 34 | 7.0 | 11.511 h |
| July | 30.0°C20.7°C | 20.7°C | 24 | 4.8 | 11.512 h |
| August | 31.9°C21.8°C | 21.8°C | 40 | 6.3 | 11.712 h |
| September, selected | 32.2°C23.1°C | 23.1°C | 84 | 13.6 | 12.012 h |
| October | 31.4°C23.6°C | 23.6°C | 159 | 20.7 | 12.312 h |
| November | 30.1°C23.4°C | 23.4°C | 222 | 23.6 | 12.613 h |
| December | 29.8°C23.5°C | 23.5°C | 262 | 27.1 | 12.813 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
- Rio Branco in SeptemberBrazil · 224 kmHigh 32.4°C · Low 22.7°C · 76 mm rain
- Porto Velho in SeptemberBrazil · 343 kmHigh 32.6°C · Low 23.8°C · 103 mm rain
- Ariquemes in SeptemberBrazil · 351 kmHigh 33.1°C · Low 23.3°C · 86 mm rain
- Puerto Maldonado in SeptemberPeru · 385 kmHigh 30.8°C · Low 22.0°C · 119 mm rain
- Trinidad in SeptemberBolivia · 443 kmHigh 31.2°C · Low 22.2°C · 106 mm rain
- Ji Paraná in SeptemberBrazil · 448 kmHigh 33.3°C · Low 23.2°C · 80 mm rain
- Cacoal in SeptemberBrazil · 505 kmHigh 33.3°C · Low 23.0°C · 90 mm rain
- La Paz in SeptemberBolivia · 651 kmHigh 14.3°C · Low 2.4°C · 36 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 Riberalta) is explained once on the Riberalta year overview and on the Sources, method and limits page.