Halfmoon Bay Weather in September

September in Halfmoon Bay typically sees daytime highs of 18°C (64°F) and nighttime lows of 13°C (55°F). Rainfall is also possible this month, so it's worth packing an umbrella. It falls within the summer season.

Rainfall in Halfmoon Bay in September

You can expect rain on roughly 10 days based on historical data, averaging 113 mm (4.4 in) for the month. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Halfmoon Bay in September

Expect highs of 18°C (64°F) in Halfmoon Bay in September, with nights dropping to around 13°C (55°F). During September, you'll experience the summer season. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to around 13°C (55°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Halfmoon Bay in September

The month enjoys around 212 hours of sunshine, creating mostly sunny days with good weather conditions.

If your ideal day consists of dry skies and pleasant temperatures, July and August typically offer the best circumstances for Halfmoon Bay.