Climate averages 1991–2020
Wellington weather
in September.
A cool, moderately wet month: the 9th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Wellington: daytime highs average 12.3°C and nights cool to about 9.4°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 74 mm of rain on roughly 11 days, which makes September a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 47 min on an average September day.
The nearest other city in this atlas is Lower Hutt (14 km away). In September its highs average 13.0°C, 0.7°C warmer than Wellington, with 76 mm of rain.
Among the 11 cities listed in New Zealand, Wellington ranks 10th of 11 for the warmest September highs and 4th of 11 for the driest September (rainfall, lowest first). The mean September high of those 11 cities is 13.8°C; Wellington is 1.5°C cooler than that mean.
From September to October, average highs rise by 1.2°C to 13.5°C, and monthly rainfall rises from 74 mm to 83 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Wellington climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 17.8°C14.6°C | 14.6°C | 55 | 7.6 | 14.815 h |
| February | 18.3°C15.0°C | 15.0°C | 56 | 6.1 | 13.714 h |
| March | 17.2°C14.0°C | 14.0°C | 59 | 7.6 | 12.412 h |
| April | 15.4°C12.4°C | 12.4°C | 73 | 9.1 | 11.011 h |
| May | 13.8°C11.1°C | 11.1°C | 76 | 10.3 | 9.910 h |
| June | 12.0°C9.4°C | 9.4°C | 95 | 12.1 | 9.29 h |
| July | 11.2°C8.6°C | 8.6°C | 87 | 12.2 | 9.510 h |
| August | 11.3°C8.6°C | 8.6°C | 82 | 12.7 | 10.510 h |
| September, selected | 12.3°C9.4°C | 9.4°C | 74 | 10.7 | 11.812 h |
| October | 13.5°C10.4°C | 10.4°C | 83 | 11.4 | 13.213 h |
| November | 14.7°C11.5°C | 11.5°C | 69 | 9.1 | 14.414 h |
| December | 16.5°C13.4°C | 13.4°C | 65 | 9.7 | 15.115 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Lower Hutt in SeptemberNew Zealand · 14 kmHigh 13.0°C · Low 8.8°C · 76 mm rain
- Palmerston North in SeptemberNew Zealand · 125 kmHigh 13.5°C · Low 6.5°C · 94 mm rain
- Hastings, New Zealand in SeptemberNew Zealand · 254 kmHigh 14.9°C · Low 6.9°C · 60 mm rain
- New Plymouth in SeptemberNew Zealand · 254 kmHigh 13.4°C · Low 8.3°C · 173 mm rain
- Christchurch in SeptemberNew Zealand · 305 kmHigh 13.4°C · Low 4.8°C · 43 mm rain
- Hamilton, New Zealand in SeptemberNew Zealand · 392 kmHigh 14.8°C · Low 7.1°C · 114 mm rain
- Tauranga in SeptemberNew Zealand · 418 kmHigh 14.8°C · Low 8.8°C · 112 mm rain
- Manukau City in SeptemberNew Zealand · 478 kmHigh 15.0°C · Low 9.5°C · 86 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Wellington) is explained once on the Wellington year overview and on the Sources, method and limits page.