Climate Insights for Hamilton

The climate in Hamilton is temperate. The average annual temperature is 15°C and approximately 1324mm of precipitation falls per year. Hamilton receives a notable amount of rainfall throughout the year, including during its driest month. Hamilton is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: February, January, March. The coldest months are August, July, June, when temperatures can drop to 6°C.

Hamilton sees moderate temperature variation throughout the year, ranging from 6°C to 24°C. February is the warmest month, though highs remain moderate at 24°C with a mean of 21°C. August is the coolest month, with minimum temperatures around 6°C and an average of 10°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between May and June, with a 4°C shift in average temperatures.

Hamilton is a fairly wet location, receiving approximately 1324mm of precipitation annually, which averages out to around 110mm per month. The wettest month is July, averaging 154mm of rainfall. September and November also tend to see above-average precipitation. The driest month is December, with just 45mm. That's 109mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Hamilton is relatively calm, with an average annual wind speed of 4km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 5km/h, though still comfortable for most outdoor activities. The calmest conditions occur in April, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 2km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans.

It is currently winter in Hamilton, which began on June 21, 2026. Hamilton is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 24°C, while the coldest stretch bottoms out in August near 6°C. Spring is next, beginning on September 23, 2026 — 64 days from now.

The best time to visit Hamilton is during March, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 51mm per month. By contrast, February can be uncomfortably hot with highs reaching 24°C, while August is the coldest period with lows dropping to 6°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Hamilton 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.