Climate averages 1991–2020
Cusco weather
in September.
A mild, fairly dry month: the 3rd warmest and the 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Cusco: daytime highs average 16.2°C and nights cool to about 6.6°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 37 mm of rain on roughly 13 days, which makes September a fairly dry 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 Abancay (100 km away). In September its highs average 21.0°C, 4.8°C warmer than Cusco, with 41 mm of rain.
Among the 24 cities listed in Peru, Cusco ranks 21st of 24 for the warmest September highs and 16th of 24 for the driest September (rainfall, lowest first). The mean September high of those 24 cities is 23.3°C; Cusco is 7.0°C cooler than that mean.
From September to October, average highs rise by 0.3°C to 16.5°C, and monthly rainfall rises from 37 mm to 84 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
Cusco climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 15.4°C8.2°C | 8.2°C | 229 | 28.8 | 12.813 h |
| February | 15.4°C8.3°C | 8.3°C | 215 | 26.3 | 12.513 h |
| March | 15.4°C8.1°C | 8.1°C | 169 | 27.4 | 12.212 h |
| April | 15.3°C7.4°C | 7.4°C | 76 | 18.6 | 11.812 h |
| May | 15.3°C6.5°C | 6.5°C | 24 | 8.1 | 11.511 h |
| June | 15.0°C5.4°C | 5.4°C | 11 | 3.3 | 11.311 h |
| July | 15.0°C4.9°C | 4.9°C | 11 | 3.1 | 11.411 h |
| August | 15.7°C5.4°C | 5.4°C | 22 | 6.5 | 11.712 h |
| September, selected | 16.2°C6.6°C | 6.6°C | 37 | 13.1 | 12.012 h |
| October | 16.5°C7.7°C | 7.7°C | 84 | 20.3 | 12.412 h |
| November | 16.6°C8.3°C | 8.3°C | 116 | 22.8 | 12.713 h |
| December | 15.9°C8.4°C | 8.4°C | 196 | 27.6 | 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
- Abancay in SeptemberPeru · 100 kmHigh 21.0°C · Low 10.7°C · 41 mm rain
- Juliaca in SeptemberPeru · 295 kmHigh 15.9°C · Low 1.1°C · 46 mm rain
- Puerto Maldonado in SeptemberPeru · 318 kmHigh 30.8°C · Low 22.0°C · 119 mm rain
- Puno in SeptemberPeru · 331 kmHigh 15.8°C · Low 2.2°C · 51 mm rain
- Huancayo in SeptemberPeru · 387 kmHigh 13.8°C · Low 4.3°C · 90 mm rain
- Ica in SeptemberPeru · 411 kmHigh 26.6°C · Low 16.1°C · 0.1 mm rain
- Chincha Alta in SeptemberPeru · 451 kmHigh 22.9°C · Low 16.0°C · 0.1 mm rain
- Viacha in SeptemberBolivia · 525 kmHigh 15.2°C · Low 0.7°C · 32 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 Cusco) is explained once on the Cusco year overview and on the Sources, method and limits page.