Monthly climate guide
Arequipa weather in September
September in Arequipa is typically mild, with average daytime highs around 20°C (69°F) and night-time lows near 5°C (40°F). The month usually brings about 5 mm of rain (very dry) and is mostly sunny. Daytime highs are about the same as August and about the same as October.
What stands out in September
- Evenings cool off sharply: the daily range is around 16°C, so pack a layer.
- Rain is well below Arequipa's usual level (around 68% less).
- Only 2 months are warmer in Arequipa than September.
- It's one of the drier stretches of the year in Arequipa.
Avg high
20°C
69°F
Avg low
5°C
40°F
Rainfall
5 mm
very dry
Humidity
36%
relative
Sky
28%
cloud · mostly sunny
Arequipa weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 19°C / 66°F | 7°C / 44°F | 41 mm | 65% | 64% |
| February | 18°C / 65°F | 7°C / 44°F | 58 mm | 71% | 69% |
| March | 19°C / 66°F | 7°C / 44°F | 31 mm | 68% | 55% |
| April | 19°C / 67°F | 6°C / 42°F | 10 mm | 58% | 41% |
| May | 19°C / 66°F | 4°C / 39°F | 3 mm | 43% | 27% |
| June | 18°C / 65°F | 3°C / 38°F | 1 mm | 39% | 25% |
| July | 19°C / 65°F | 3°C / 38°F | 1 mm | 34% | 25% |
| August | 19°C / 67°F | 3°C / 38°F | 1 mm | 33% | 25% |
| September | 20°C / 69°F | 5°C / 40°F | 5 mm | 36% | 28% |
| October | 20°C / 69°F | 5°C / 42°F | 11 mm | 41% | 37% |
| November | 21°C / 69°F | 6°C / 43°F | 4 mm | 43% | 37% |
| December | 20°C / 68°F | 7°C / 44°F | 21 mm | 55% | 53% |
What to pack for September
- T-shirts plus a light layer for the evening
- Comfortable trainers or sandals for long walks
- An extra layer — evenings are noticeably cooler than afternoons
- Sunglasses
Is September a good time to visit Arequipa?
Compare the months in the chart above to find your ideal window.
Best time to visit Arequipa →Other Peru cities in September
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Arequipa weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/peru/arequipa/september
<a href="https://weathercompare.eu/weather/peru/arequipa/september">Arequipa weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/peru/arequipa" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Arequipa weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/peru/arequipa/september">Arequipa weather in September</a> – WeatherCompare</p>
Arequipa in September: quick answers
Is September a good time to visit Arequipa?
September is a reasonable time for Arequipa: highs around 20°C and about 5 mm of rain, though not one of the three best months.
How warm is Arequipa in September?
Average highs are about 20°C (69°F) and average lows about 5°C (40°F), based on 10 years of daily data.
Does it rain a lot in Arequipa in September?
Arequipa typically gets around 5 mm of rain in September — very dry.
Figures are long-term averages for the area around Arequipa (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.