Hillsborough Weather in September

With daytime temperatures of 17°C (63°F) and nighttime lows of 11°C (52°F), September in Hillsborough brings moderate temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 79 mm (3.1 in) falls on average.

Rainfall in Hillsborough in September

You can expect rain on roughly 18 days based on historical data, averaging 79 mm (3.1 in) for the month. This is a month with many wet days but modest rainfall totals, so showers are generally light and easy to manage.

Temperature in Hillsborough in September

Daytime temperatures in Hillsborough reach 17°C (63°F) in September, dropping to 11°C (52°F) at night. Conditions are often most pleasant around the middle of the day. Nights drop to around 11°C (52°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 Hillsborough in September

The month experiences a moderate amount of sunlight, with 109 hours of sunshine. This provides a nice balance between sunshine and clouds.

Wind Speed in Hillsborough in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

Average water temperature in September

The water temperature is 13°C (55°F), chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.

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