Monthly climate guide
Castro weather in December
Expect mild weather in Castro in December: afternoons reach about 16°C (61°F), while nights drop to around 9°C (48°F). Around 55 mm of rain falls over the month (some rain), and skies are often cloudy. Daytime highs are about the same as November and 2°C cooler than January.
What stands out in December
- Castro is usually about 2°C cooler than Puerto Montt, 130 km away, in December.
- December is Castro's third warmest month.
- Seasonally, December counts as early summer in Castro — the seasons are reversed south of the equator.
- It's one of the drier months, with about 44% less rain than Castro's average.
Avg high
16°C
61°F
Avg low
9°C
48°F
Rainfall
55 mm
some rain
Humidity
83%
relative
Sky
67%
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 December
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is December 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 December
Cite or embed this data
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Castro weather in December. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/chile/castro/december
<a href="https://weathercompare.eu/weather/chile/castro/december">Castro weather in December</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 December"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/chile/castro/december">Castro weather in December</a> – WeatherCompare</p>
Castro in December: quick answers
Is December a good time to visit Castro?
Yes. December is one of the best months for Castro, with highs around 16°C and about 55 mm of rain.
How warm is Castro in December?
Average highs are about 16°C (61°F) and average lows about 9°C (48°F), based on 10 years of daily data.
Does it rain a lot in Castro in December?
Castro typically gets around 55 mm of rain in December — some rain.
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.