Castaic Weather in September

Castaic in September sees very high daytime temperatures of 33°C (91°F) and nighttime lows of 16°C (61°F). With just 3.9 mm (0.2 in) of rainfall expected, it's a dry month overall.

Rainfall in Castaic in September

Records from the past 30 years suggest around a single day of rain, with 3.9 mm (0.2 in) average for the month. On the rare occasion it rains, expect a brief, moderate shower rather than a heavy downpour.

Temperature in Castaic in September

The temperature in Castaic in September is excellent. Daytime highs reach 33°C (91°F), with nights dropping to 16°C (61°F). It's usually most comfortable outside during the morning and later in the day. At 16°C (61°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.

Sunshine in Castaic in September

The month enjoys around 278 hours of sunshine, creating mostly sunny days with good weather conditions.

If you prefer dry days with pleasant temperatures, February, March, April, May, October and November typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.