Climate averages 1991–2020
Coari weather
in September.
A hot, wet month: the 2nd warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Coari: daytime highs average 30.2°C and nights cool to about 24.6°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 123 mm of rain on roughly 22 days, which makes September a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 05 min on an average September day.
The nearest other city in this atlas is Tefé (192 km away). In September its highs average 30.1°C, about as warm as Coari, with 142 mm of rain.
Among the 448 cities listed in Brazil, Coari ranks joint 123rd of 448 for the warmest September highs and joint 364th of 448 for the driest September (rainfall, lowest first). The mean September high of those 448 cities is 27.5°C; Coari is 2.6°C warmer than that mean.
From September to October, average highs rise by 0.1°C to 30.3°C, and monthly rainfall rises from 123 mm to 163 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
Coari climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.1°C24.0°C | 24.0°C | 285 | 28.0 | 12.312 h |
| February | 29.1°C24.0°C | 24.0°C | 278 | 25.4 | 12.212 h |
| March | 29.3°C23.9°C | 23.9°C | 334 | 28.7 | 12.112 h |
| April | 28.8°C23.8°C | 23.8°C | 335 | 28.6 | 12.012 h |
| May | 28.4°C23.7°C | 23.7°C | 297 | 29.1 | 11.912 h |
| June | 28.4°C23.5°C | 23.5°C | 167 | 25.3 | 11.912 h |
| July | 28.9°C23.7°C | 23.7°C | 101 | 20.5 | 11.912 h |
| August | 29.9°C24.3°C | 24.3°C | 96 | 18.6 | 12.012 h |
| September, selected | 30.2°C24.6°C | 24.6°C | 123 | 21.5 | 12.112 h |
| October | 30.3°C24.7°C | 24.7°C | 163 | 24.6 | 12.212 h |
| November | 29.8°C24.5°C | 24.5°C | 211 | 25.6 | 12.312 h |
| December | 29.3°C24.2°C | 24.2°C | 256 | 29.1 | 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
- Tefé in SeptemberBrazil · 192 kmHigh 30.1°C · Low 23.8°C · 142 mm rain
- Manacapuru in SeptemberBrazil · 293 kmHigh 30.5°C · Low 25.0°C · 138 mm rain
- Manaus in SeptemberBrazil · 363 kmHigh 31.2°C · Low 24.6°C · 121 mm rain
- Porto Velho in SeptemberBrazil · 527 kmHigh 32.6°C · Low 23.8°C · 103 mm rain
- Itacoatiara in SeptemberBrazil · 532 kmHigh 31.2°C · Low 25.2°C · 109 mm rain
- Ariquemes in SeptemberBrazil · 648 kmHigh 33.1°C · Low 23.3°C · 86 mm rain
- Parintins in SeptemberBrazil · 729 kmHigh 31.7°C · Low 24.9°C · 94 mm rain
- Ji Paraná in SeptemberBrazil · 767 kmHigh 33.3°C · Low 23.2°C · 80 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 Coari) is explained once on the Coari year overview and on the Sources, method and limits page.