Castaic in September
8.8out of 10
Yes, a good time to go
Warm and comfortable: highs around 30°C. Very dry: about 1 rainy days.
30°CAvg high
16°CAvg low
1Rainy days (4 mm)
12:12 hDaylight
06:43Sunrise · 18:55 Sunset
Why this score
- Warm and comfortable: highs around 30°C
- Very dry: about 1 rainy days
What to wear and pack
- T-shirts and light layers
- Shorts or a light skirt
- Sunscreen, sunglasses and a hat
How reliable is the forecast?
Rainfall in September is fairly consistent from year to year (1.0 days). 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 September?
Daytime highs average 30°C and nights about 16°C.
When is the best time to visit Castaic?
The best months are June, May, September, October.