Climate Insights for Hamilton

The climate in Hamilton is temperate. The average annual temperature is 12°C and approximately 1004mm of precipitation falls per year. Hamilton receives a notable amount of rainfall throughout the year, including during its driest month. Hamilton is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, June, August. The coldest months are January, February, December, when temperatures can drop to -6°C. Snowfall occurs from January to December, with around 72cm accumulating over the season.

Hamilton has a wide annual temperature range, spanning 37°C from the coldest to warmest months. The warmest month is July, when average highs reach 31°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to -6°C and the daily average is -3°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 8°C shift in average temperatures.

Hamilton is a moderately rainy area, receiving approximately 1004mm of precipitation annually, which averages out to around 84mm per month. The wettest month is May, averaging 137mm of rainfall. April and October also tend to see above-average precipitation. The driest month is December, with just 47mm. That's 90mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 72cm accumulating over the season. January typically sees the most snow at around 20cm.

Hamilton is relatively calm, with an average annual wind speed of 3km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 4km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 3km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently spring in Hamilton, which began on March 20, 2026. Hamilton 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 July at around 31°C, while the coldest stretch bottoms out in January near -6°C. Summer is next, beginning on June 21, 2026 — 7 days from now.

The best time to visit Hamilton is during June and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 24°C with modest rainfall averaging 88mm per month. By contrast, July can be uncomfortably hot with highs reaching 31°C, while January is the coldest period with lows dropping to -6°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. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. 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.