Climate and monthly weather forecast
Whanganui, New Zealand

Whanganui graces New Zealand with a Marine west coast climate, also known as a warm summer, abbreviated to Cfb in the Köppen climate classification. Earth's topography funnels this scenic city with weather originating from the surrounding ocean. A determinative pendulum swing in temperatures, margins of rainfall, and daylight hours epitomizes Whanganui's weather across the calendar year.

Temperatures maintain a narrow range from year-start to year-end, with the highest averages tracing from 22.4°C (72.3°F) in January to 13.2°C (55.8°F) in July. Correspondingly, the lowest average temperatures follow a near-mirror route, with January starting at 14°C (57.2°F) and dropping to 5.6°C (42.1°F) by July. These numbers are emblematic of a temperate climate where extremes are relatively rare.

Rainfall exhibits a more complex dance throughout the year, reflecting the city's proximity to the coast and the broader New Zealand weather system's intricacies. February is edged by an average of 76mm (2.99") of rain. This number drops slightly to 63mm (2.48") in March, increases again in May to 80mm (3.15"), and hits a walloping 89mm (3.5") in June. Rainfall then tapers off to a low of 74mm (2.91") in September, before climbing again to reach 88mm (3.46") in October and declining towards the year-end of precipitation is typically aggregated. In January, the average length of the day in Whanganui is 14h and 38min.
On the first day of January, sunrise is at 5:54 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 6:26 am and sunset at 8:39 pm NZDT. With an average of 8.1h of sunshine, January has the most sunshine of the year.

February comes with slightly warmed-up weather in Whanganui as the summer season hits its peak. The daytime temperatures rise slightly to reach an average high of 22.7°C (72.9°F). While the amount of daylight decreases slightly, the month enjoys a reasonable amount of sunshine. Weather in February »

In Whanganui, March experiences a transition from the warmth of summer to the cooler autumn months. Compared to February, the temperatures have a slight drop, with averages varying between 12.9°C (55.2°F) and 21.3°C (70.3°F). Weather in March »

April signifies the middle of the autumn season in Whanganui. There is a clear decrease in temperature, having the average high temperature drop to 18.8°C (65.8°F). With the arrival of the cooler months, daylight hours decrease and so do the sunshine hours. Weather in April »

May presents a steeper temperature drop in Whanganui, marking the dawn of the cooler months. The average low temperature dips down to 8.5°C (47.3°F), signifying the approach of the cold season. Even though daylight hours continue to decrease, it's not a deterrent for outdoor explorations. Weather in May »

The month of June brings the official start of winter to Whanganui. The city experiences its coldest month with temperatures averaging between 6.5°C (43.7°F) and 13.2°C (55.8°F), marking a clear departure from the previous month's weather scenario. Weather in June »

July is usually the peak winter month in Whanganui, yet meteorological data show there is a slight increase in temperature with the average minimum temperature rising to 5.6°C (42.1°F) from last month's 6.5°C (43.7°F). Daylight hours show a marginal increase, yet the winter chill continues to persist throughout this month. Weather in July »

The weather in August in Whanganui is characterized by a gradual increase in temperature, signifying the close of the cold season. The transition from winter to spring is marked by a slight rise in both daylight and sunshine hours. Weather in August »

September marks the onset of spring in Whanganui. This period is characterized by a noticeable increase in temperature and gradually lengthening daylight hours. With an average high temperature of 15.3°C (59.5°F), one can feel the warmth returning to the city. Weather in September »

Whanganui in October continues to experience bright, sunny days. The average high temperature climbs up to 17°C (62.6°F), markedly warmer compared to the previous month. The daylight hours continue to increase, giving residents and visitors more daylight to enjoy outdoor activities. Weather in October »

November's weather in Whanganui is characterized by further increases in both temperature and daylight hours. With daylight hours exceeding 14.3 hours, the hours of sunshine also experience an upsurge. The city gears up for the summer season, and higher temperatures become the new normal. Weather in November »

December witnesses the start of the summer season in Whanganui. The temperatures increase further to average between 12.8°C (55°F) and 20.7°C (69.3°F)—clearly warmer than the previous month. The daylight hours reach its peak and the city experiences its longest period of daylight. Weather in December »