Climate averages 1991–2020
Iquitos weather
in September.
A hot, wet month: the joint 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 Iquitos: daytime highs average 30.0°C and nights cool to about 23.0°C. By daytime temperature it is the joint 2nd warmest of the 12 months.
Expect about 179 mm of rain on roughly 24 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 San Juan, Peru (4 km away). In September its highs average 30.1°C, about as warm as Iquitos, with 179 mm of rain.
Among the 24 cities listed in Peru, Iquitos ranks 4th of 24 for the warmest September highs and joint 23rd of 24 for the driest September (rainfall, lowest first). The mean September high of those 24 cities is 23.3°C; Iquitos is 6.7°C warmer than that mean.
From September to October, average highs rise by 0.2°C to 30.2°C, and monthly rainfall rises from 179 mm to 201 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
Iquitos climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.0°C23.4°C | 23.4°C | 252 | 25.9 | 12.312 h |
| February | 30.0°C23.4°C | 23.4°C | 235 | 24.7 | 12.212 h |
| March | 29.8°C23.4°C | 23.4°C | 304 | 28.4 | 12.112 h |
| April | 29.4°C23.2°C | 23.2°C | 294 | 27.3 | 12.012 h |
| May | 28.8°C22.9°C | 22.9°C | 271 | 26.7 | 11.912 h |
| June | 28.2°C22.3°C | 22.3°C | 218 | 25.0 | 11.912 h |
| July | 28.2°C22.0°C | 22.0°C | 165 | 23.3 | 11.912 h |
| August | 29.3°C22.4°C | 22.4°C | 154 | 21.8 | 12.012 h |
| September, selected | 30.0°C23.0°C | 23.0°C | 179 | 23.5 | 12.112 h |
| October | 30.2°C23.4°C | 23.4°C | 201 | 25.8 | 12.212 h |
| November | 29.9°C23.5°C | 23.5°C | 235 | 25.8 | 12.312 h |
| December | 29.9°C23.4°C | 23.4°C | 263 | 27.2 | 12.312 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
- San Juan, Peru in SeptemberPeru · 4 kmHigh 30.1°C · Low 23.1°C · 179 mm rain
- Cruzeiro do Sul in SeptemberBrazil · 436 kmHigh 30.6°C · Low 22.4°C · 109 mm rain
- Pucallpa in SeptemberPeru · 535 kmHigh 30.7°C · Low 23.1°C · 148 mm rain
- Cuenca in SeptemberEcuador · 645 kmHigh 18.1°C · Low 9.8°C · 62 mm rain
- Florencia in SeptemberColombia · 651 kmHigh 27.2°C · Low 18.0°C · 108 mm rain
- Loja in SeptemberEcuador · 661 kmHigh 21.9°C · Low 13.9°C · 36 mm rain
- Pitalito in SeptemberColombia · 696 kmHigh 22.7°C · Low 13.4°C · 200 mm rain
- Ipiales in SeptemberColombia · 704 kmHigh 15.7°C · Low 8.2°C · 109 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 Iquitos) is explained once on the Iquitos year overview and on the Sources, method and limits page.
San Juan, Peru lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.