Climate averages 1991–2020
Callao weather
in September.
A mild, very dry month: the 10th warmest and the 6th driest of the year. Meets the pleasant-weather rule
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Callao: daytime highs average 20.1°C and nights cool to about 15.3°C. By daytime temperature it is the 10th warmest of the 12 months.
Expect about 3.7 mm of rain on fewer than one day, which makes September a very dry month (the 6th 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 Lima (12 km away). In September its highs average 21.2°C, 1.1°C warmer than Callao, with 1.6 mm of rain.
Among the 24 cities listed in Peru, Callao ranks 18th of 24 for the warmest September highs and 12th of 24 for the driest September (rainfall, lowest first). The mean September high of those 24 cities is 23.3°C; Callao is 3.2°C cooler than that mean.
From September to October, average highs rise by 0.8°C to 20.9°C, and monthly rainfall falls from 3.7 mm to 2.8 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
Callao climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.6°C20.3°C | 20.3°C | 5.2 | 1.5 | 12.713 h |
| February | 26.6°C21.4°C | 21.4°C | 7.8 | 2.0 | 12.512 h |
| March | 26.5°C21.2°C | 21.2°C | 5.9 | 1.7 | 12.212 h |
| April | 24.7°C19.5°C | 19.5°C | 1.6 | 0.2 | 11.812 h |
| May | 22.3°C17.6°C | 17.6°C | 2.3 | 0.2 | 11.612 h |
| June | 20.5°C16.2°C | 16.2°C | 4.9 | 1.1 | 11.411 h |
| July | 19.6°C15.4°C | 15.4°C | 5.3 | 1.2 | 11.511 h |
| August | 19.6°C15.0°C | 15.0°C | 4.9 | 1.2 | 11.712 h |
| September, selected | 20.1°C15.3°C | 15.3°C | 3.7 | 0.5 | 12.012 h |
| October | 20.9°C15.8°C | 15.8°C | 2.8 | 0.3 | 12.412 h |
| November | 22.0°C16.8°C | 16.8°C | 2.2 | 0.1 | 12.713 h |
| December | 23.7°C18.5°C | 18.5°C | 2.7 | 0.6 | 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
- Lima in SeptemberPeru · 12 kmHigh 21.2°C · Low 15.6°C · 1.6 mm rain
- Santa Anita - Los Ficus in SeptemberPeru · 18 kmHigh 19.0°C · Low 14.2°C · 1.6 mm rain
- Chosica in SeptemberPeru · 48 kmHigh 23.9°C · Low 17.7°C · 4.0 mm rain
- Chincha Alta in SeptemberPeru · 186 kmHigh 22.9°C · Low 16.0°C · 0.1 mm rain
- Huancayo in SeptemberPeru · 209 kmHigh 13.8°C · Low 4.3°C · 90 mm rain
- Huánuco (approximate) in SeptemberPeru · 255 kmHigh 23.6°C · Low 15.0°C · 35 mm rain
- Ica in SeptemberPeru · 271 kmHigh 26.6°C · Low 16.1°C · 0.1 mm rain
- Chimbote in SeptemberPeru · 367 kmHigh 20.0°C · Low 15.3°C · 1.4 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 Callao) is explained once on the Callao year overview and on the Sources, method and limits page.