Weather in Wellington in September 2025
Average weather
Average temperature in Wellington in September
Going from a maximum of +18°C during the day to a minimum of +5°C during the night, the temperature in September averages around +15°C.
The average maximum temperature goes down 15% by the end of the month, compared with the beginning of the month, from +15°C to +13°C.
Is Wellington warm or cold in September?
Wellington is typically mild in September.
Maximum temperatures go up compared to the previous month from +12°C to +13°C. The minimum temperature also goes up from +9°C to +10°C.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Wellington:
Climate in Wellington in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +12°C | +13°C | +15°C | ||||
| Min. temperature | ||||||
| +1°C | +2°C | +3°C | ||||
| Max. temperature | ||||||
| +18°C | +19°C | +21°C | ||||
| Rainfall | ||||||
| 94 mm | 79 mm | 85 mm | ||||
| Wind | ||||||
| 6 m/s | 6 m/s | 7 m/s | ||||
| Humidity | ||||||
| 80% | 81% | 81% | ||||
| Air pressure | ||||||
| 1013 HPa | 1012 HPa | 1012 HPa | ||||
| Sunny days | ||||||
| 4 | 4 | 4 | ||||
| Cloudy days | ||||||
| 9 | 10 | 11 | ||||
| Rainy days | ||||||
| 18 | 16 | 16 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting warmer as September arrives. The average maximum temperature goes up from +12°C to +13°C during the day. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 94 mm to 79 mm. Humidity rises from 80% to 81%. The average wind speed doesn’t change much during September, staying around 6 m/s. The amount of sunny days stay about the same, averaging 4 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 7 m/s getting up to 13 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Wellington is gradually decreasing during September, going from 8 m/s to 7 m/s over the course of the month.
Rain
How was the weather last September in Wellington?
Climate Change over Years
The climate in Wellington in September has not changed much over the last 43 years.
The average temperature was the lowest in 1992 (+14°C) and the highest in 2022 (+17°C). The driest year was 2007 with only 644 mm of rainfall, and the wettest year was 2022 with 2261 mm.
FAQ
Is September a good time to visit Wellington?
Can you sunbathe in Wellington in September?
Is Wellington rainy in September?
Is it sunny in Wellington in September?
Other cities in New Zealand
Monthly weather in Wellington
Source of the data
For this page, we’ve looked at the typical weather in Wellington, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.