Climate Insights for Hillsborough

The climate in Hillsborough is temperate. The average annual temperature is 13°C and approximately 537mm of precipitation falls per year. January is the wettest month, receiving around 113mm of rainfall. Hillsborough is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: September, October, August. The coldest months are February, January, December, when temperatures can drop to 9°C.

Hillsborough has relatively stable temperatures year-round, staying within a 10°C range. September is the warmest month, though highs remain moderate at 19°C with a mean of 16°C. February is the coolest month, with minimum temperatures around 9°C and an average of 11°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 2°C shift in average temperatures.

Hillsborough is a relatively dry area, receiving approximately 537mm of precipitation annually, which averages out to around 45mm per month. The wettest month is January, averaging 113mm of rainfall. December and March also tend to see above-average precipitation. The driest month is July, with just 1mm. That's 112mm less than January, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Hillsborough is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 11km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months.

It is currently summer in Hillsborough, which began on June 21, 2026. Hillsborough is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in September at around 19°C, while the coldest stretch bottoms out in February near 9°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Hillsborough is during August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 10mm per month. By contrast, February can be quite cold with temperatures dropping to 9°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Hillsborough based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.