Monthly climate guide
Castro weather in September
September in Castro is typically cool, with average daytime highs around 11°C (52°F) and night-time lows near 5°C (42°F). The month usually brings about 91 mm of rain (wet) and is often cloudy. Daytime highs are about the same as August and 2°C cooler than October.
What stands out in September
- In Castro, September is early spring — the seasons are reversed south of the equator.
- Days and nights are close, only about 6°C apart.
- Castro is usually about 2°C cooler than Valdivia, 300 km away, in September.
Avg high
11°C
52°F
Avg low
5°C
42°F
Rainfall
91 mm
wet
Humidity
87%
relative
Sky
72%
cloud · often cloudy
Castro weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | 18°C / 64°F | 10°C / 49°F | 47 mm | 83% | 55% |
| February | 17°C / 63°F | 10°C / 50°F | 53 mm | 84% | 56% |
| March | 16°C / 61°F | 9°C / 48°F | 71 mm | 86% | 63% |
| April | 14°C / 57°F | 8°C / 46°F | 112 mm | 88% | 70% |
| May | 12°C / 54°F | 7°C / 45°F | 151 mm | 90% | 81% |
| June | 10°C / 49°F | 6°C / 42°F | 170 mm | 91% | 80% |
| July | 9°C / 49°F | 5°C / 41°F | 153 mm | 91% | 77% |
| August | 10°C / 50°F | 5°C / 42°F | 147 mm | 90% | 81% |
| September | 11°C / 52°F | 5°C / 42°F | 91 mm | 87% | 72% |
| October | 13°C / 55°F | 6°C / 43°F | 75 mm | 85% | 70% |
| November | 15°C / 58°F | 7°C / 45°F | 64 mm | 83% | 69% |
| December | 16°C / 61°F | 9°C / 48°F | 55 mm | 83% | 67% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A compact umbrella or packable rain jacket
- Water-resistant shoes
Is September a good time to visit Castro?
Compare the months in the chart above to find your ideal window.
Best time to visit Castro →Other Chile cities in September
Cite or embed this data
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Castro weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/chile/castro/september
<a href="https://weathercompare.eu/weather/chile/castro/september">Castro weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/chile/castro" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Castro weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/chile/castro/september">Castro weather in September</a> – WeatherCompare</p>
Castro in September: quick answers
Is September a good time to visit Castro?
September is cool in Castro, with highs around 11°C. Better for museums and city walks than the beach, and usually quieter.
How warm is Castro in September?
Average highs are about 11°C (52°F) and average lows about 5°C (42°F), based on 10 years of daily data.
Does it rain a lot in Castro in September?
Castro typically gets around 91 mm of rain in September — wet.
Figures are long-term averages for the area around Castro (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.