Castaic in December
7.3out of 10
Possible, with caveats
Mild: highs around 15°C. Some rain: about 5 rainy days.
15°CAvg high
5°CAvg low
5Rainy days (50 mm)
9:42 hDaylight
07:00Sunrise · 16:42 Sunset
Why this score
- Mild: highs around 15°C
- Some rain: about 5 rainy days
What to wear and pack
- Layers you can add or remove
- Comfortable walking shoes
How reliable is the forecast?
Rain in December varies a lot between years (±3.1 rainy days), so check the forecast closer to your trip. Averages cover 30 years (1991–2020). Individual days can differ a lot.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 16°C | 5°C | 70 mm | 6 | – | – | 7.3 |
| February | 17°C | 6°C | 81 mm | 7 | – | – | 7.3 |
| March | 19°C | 7°C | 56 mm | 6 | – | – | 7.8 |
| April | 22°C | 9°C | 22 mm | 4 | – | – | 8.6 |
| May | 25°C | 12°C | 10 mm | 2 | – | – | 8.8 |
| June | 28°C | 15°C | 2 mm | 0 | – | – | 9.0 |
| July | 31°C | 18°C | 3 mm | 1 | – | – | 8.5 |
| August | 32°C | 18°C | 1 mm | 0 | – | – | 8.3 |
| September | 30°C | 16°C | 4 mm | 1 | – | – | 8.8 |
| October | 25°C | 12°C | 15 mm | 2 | – | – | 8.8 |
| November | 20°C | 8°C | 18 mm | 3 | – | – | 8.3 |
| December | 15°C | 5°C | 50 mm | 5 | – | – | 7.3 |
Frequently asked questions
How hot is Castaic in December?
Daytime highs average 15°C and nights about 5°C.
When is the best time to visit Castaic?
The best months are June, May, September, October.