Hamilton Weather

Right now in Hamilton it is 10°C and overcast. Today's high is 19°C with a low of 9°C. Humidity is at 100%. Wind is S at 1 km/h.

Today (29 Apr): Light drizzle with a high of 19°C and low of 9°C. No rain expected. UV index 4.3 (moderate). Thu (30 Apr): Overcast with a high of 19°C and low of 9°C. 4% chance of rain. UV index 4.3 (moderate). Fri (1 May): Mainly clear with a high of 17°C and low of 7°C. No rain expected. UV index 4.2 (moderate). Sat (2 May): Clear sky with a high of 16°C and low of 6°C. No rain expected. UV index 4.2 (moderate). Sun (3 May): Overcast with a high of 17°C and low of 6°C. No rain expected. UV index 4.2 (moderate). Mon (4 May): Overcast with a high of 17°C and low of 7°C. 4% chance of rain. UV index 3.2 (moderate). Tue (5 May): Overcast with a high of 19°C and low of 8°C. 8% chance of rain. UV index 3.3 (moderate). Wed (6 May): Light drizzle with a high of 19°C and low of 13°C. 24% chance of rain, up to 1.2mm. UV index 3.1 (moderate). Thu (7 May): Light drizzle with a high of 19°C and low of 13°C. 29% chance of rain, up to 0.6mm. UV index 3.3 (moderate). Fri (8 May): Moderate drizzle with a high of 19°C and low of 12°C. 27% chance of rain, up to 4.7mm. UV index 2.9 (low). Sat (9 May): Moderate drizzle with a high of 17°C and low of 8°C. 37% chance of rain, up to 2.5mm. UV index 2.4 (low). Sun (10 May): Light drizzle with a high of 16°C and low of 6°C. 47% chance of rain, up to 1.8mm. UV index 3.4 (moderate). Mon (11 May): Overcast with a high of 13°C and low of 8°C. 29% chance of rain. UV index 2.5 (low). Tue (12 May): Overcast with a high of 15°C and low of 8°C. 24% chance of rain. UV index 3.4 (moderate).

The current air quality index in Hamilton is 18 (European AQI), rated "Good". Air quality is excellent. Enjoy outdoor activities freely. PM2.5 is 17.2 µg/m³. PM10 is 18.2 µg/m³.

Hamilton experiences a temperate oceanic climate (Cfb) with warm summers and cool, wet winters. Summers (December-February) see average highs around 23-24°C, while winters (June-August) average highs of 13-14°C, with frequent frosts overnight. Rainfall is spread throughout the year, but winters are typically the wettest period. The weather can be changeable, so layering is often recommended.

Yes, Hamilton receives a healthy amount of rainfall, with an annual average of approximately 1180mm. Rain is distributed throughout the year, but the winter months from June to August tend to be the wettest, with an average of 11-12 rain days per month. Short, heavy downpours are common, even during drier periods, so it's always wise to be prepared.

Hamilton's inland location means it generally experiences lighter winds than coastal areas. Average wind speeds typically range from 10-20 km/h. During frontal passages or significant weather events, winds can pick up considerably, with gusts potentially reaching 50-70 km/h, especially during winter storms. Stronger winds are less frequent than in more exposed parts of New Zealand.

Hamilton experiences high to extreme UV index levels, particularly from September to April, even on cloudy days. The UV index can regularly reach 8-11+ in summer. Sun protection is crucial: wear SPF 30+ sunscreen, a wide-brimmed hat, sunglasses, and protective clothing when outdoors to minimise sun exposure and reduce the risk of skin damage and skin cancer.

The best time for outdoor activities is during the warmer and drier months of summer (December to February) and early autumn (March-April). During this period, temperatures are pleasant, and there's more sunshine, ideal for exploring Hamilton Gardens, cycling the river trails, and enjoying local festivals. Spring also offers good conditions with blooming gardens and warming weather, though it can be more unpredictable with showers.

Sunrise and sunset times vary significantly throughout the year due to Hamilton's mid-latitude. In summer, sunrise can be as early as 5:45 AM and sunset as late as 8:50 PM. In winter, sunrise is closer to 7:30 AM and sunset around 5:15 PM. You can find detailed daily sunrise and sunset times, along with moon phases, on the dedicated /weather/sunrise-sunset page.

Swimming in the Waikato River is generally permissible at designated recreational spots, especially during warmer months. However, water quality can fluctuate, particularly after heavy rainfall when runoff increases. Always check local council water quality alerts and signage before entering the river. For ocean swimming, the nearby west coast beaches like Raglan offer clearer, surfable waters.

Air quality in Hamilton is generally good. However, during calm, cold winter nights, temperature inversions can trap pollutants from wood burners and vehicle emissions, leading to elevated PM2.5 and PM10 levels, particularly in central and low-lying areas. This can sometimes result in moderate to poor air quality, especially in the mornings. Real-time AQI information is available on the dedicated /weather/air-quality page.

Yes, frosts are a common occurrence in Hamilton during the winter months, typically from May to September. They are most frequent in low-lying areas and rural fringes of the city due to cold air sinking. Overnight temperatures often drop below freezing, requiring care if driving early in the morning due to potential black ice on roads and frozen windscreens.

For a trip to Hamilton, pack layers. In summer, light clothing, a hat, sunglasses, and sunscreen are essential, with a light jacket for cooler evenings. For autumn and spring, include a waterproof jacket, warmer layers, and comfortable walking shoes. In winter, heavy warm clothing, including thermals, a waterproof and windproof coat, gloves, and a hat, is crucial, especially if you plan to be outdoors early mornings or late evenings.

While the moon phase doesn't directly impact daily weather like temperature or rainfall, it significantly influences tidal patterns in coastal areas linked to the Waikato River. Full and new moons result in larger spring tides, which can cause higher water levels in river estuaries and coastal regions, potentially affecting boating and coastal activities. Detailed moon phase information is available on the /weather/sunrise-sunset page.

The primary driving hazards in Hamilton relate to wet roads and potential black ice in winter. Heavy rainfall can reduce visibility and create slippery conditions. During frosty winter mornings, particularly in shaded and rural areas, black ice is a significant risk. Always drive to the conditions, allow extra braking distance, and check for road warnings during severe weather events.

Spring (September to November) is largely considered the best time for gardening in Hamilton, as temperatures rise, frosts become less frequent, and plants begin active growth. Autumn (March to May) is also excellent for planting cool-season vegetables and preparing garden beds. Summer requires consistent watering, while winter is ideal for dormant pruning and garden maintenance.

Severe thunderstorms are not an everyday occurrence in Hamilton but can happen, particularly between late spring and early autumn. They may bring heavy downpours, localised flooding, strong winds, and sometimes hail. While usually short-lived, it's advised to monitor weather warnings during periods of atmospheric instability.

You can find the latest weather radar for the Hamilton region on the MetService website. The radar provides real-time updates on rain, hail, and storm movements, helping you plan your day. Visit the MetService radar page for the North Island, which covers the Waikato region, at metservice.com/maps-radar/rain-radar/new-zealand/north-island.