Climate Insights for Hamilton

The climate in Hamilton is temperate. The average annual temperature is 15°C and approximately 1242mm 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 July, August, June, when temperatures can drop to 7°C.

Hamilton sees moderate temperature variation throughout the year, ranging from 7°C to 24°C. February is the warmest month, though highs remain moderate at 24°C with a mean of 20°C. July is the coolest month, with minimum temperatures around 7°C and an average of 10°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between April and May, with a 3°C shift in average temperatures.

Hamilton is a fairly wet location, receiving approximately 1242mm of precipitation annually, which averages out to around 103mm per month. The wettest month is September, averaging 131mm of rainfall. July and August also tend to see above-average precipitation. The driest month is January, with just 77mm. That's 53mm less than September, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around.

Hamilton is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is September, averaging 24km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in March, with average winds dropping to 19km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 5km/h between the calmest and windiest months.

It is currently autumn in Hamilton, which began on March 20, 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 July near 7°C. Winter is next, beginning on June 21, 2026 — 90 days from now.

The best time to visit Hamilton is during January, February, March, April and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 88mm per month. By contrast, July can be quite cold with temperatures dropping to 7°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

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.