Climate averages 1991–2020
Hamilton, New Zealand weather
in September.
A cool, wet month: the 9th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in Hamilton, New Zealand: daytime highs average 14.8°C and nights cool to about 7.1°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 114 mm of rain on roughly 14 days, which makes September a wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 49 min on an average September day.
The nearest other city in this atlas is Tauranga (78 km away). In September its highs average 14.8°C, about as warm as Hamilton, New Zealand, with 112 mm of rain.
Among the 11 cities listed in New Zealand, Hamilton, New Zealand ranks joint 4th of 11 for the warmest September highs and 10th of 11 for the driest September (rainfall, lowest first). The mean September high of those 11 cities is 13.8°C; Hamilton, New Zealand is 1.0°C warmer than that mean.
From September to October, average highs rise by 1.5°C to 16.4°C, and monthly rainfall falls from 114 mm to 100 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
Hamilton, New Zealand climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 22.5°C14.0°C | 14.0°C | 70 | 8.8 | 14.414 h |
| February | 23.2°C14.5°C | 14.5°C | 72 | 8.0 | 13.514 h |
| March | 21.4°C12.8°C | 12.8°C | 72 | 7.6 | 12.412 h |
| April | 18.6°C10.3°C | 10.3°C | 92 | 9.4 | 11.111 h |
| May | 15.8°C8.2°C | 8.2°C | 107 | 11.4 | 10.110 h |
| June | 13.5°C6.1°C | 6.1°C | 114 | 12.1 | 9.610 h |
| July | 12.9°C5.1°C | 5.1°C | 127 | 13.3 | 9.810 h |
| August | 13.5°C5.7°C | 5.7°C | 122 | 14.8 | 10.711 h |
| September, selected | 14.8°C7.1°C | 7.1°C | 114 | 13.9 | 11.812 h |
| October | 16.4°C8.8°C | 8.8°C | 100 | 12.7 | 13.013 h |
| November | 18.1°C10.2°C | 10.2°C | 88 | 11.0 | 14.114 h |
| December | 20.5°C12.7°C | 12.7°C | 99 | 11.0 | 14.715 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
- Tauranga in SeptemberNew Zealand · 78 kmHigh 14.8°C · Low 8.8°C · 112 mm rain
- Manukau City in SeptemberNew Zealand · 95 kmHigh 15.0°C · Low 9.5°C · 86 mm rain
- Auckland in SeptemberNew Zealand · 114 kmHigh 15.0°C · Low 10.0°C · 93 mm rain
- New Plymouth in SeptemberNew Zealand · 177 kmHigh 13.4°C · Low 8.3°C · 173 mm rain
- Hastings, New Zealand in SeptemberNew Zealand · 247 kmHigh 14.9°C · Low 6.9°C · 60 mm rain
- Palmerston North in SeptemberNew Zealand · 288 kmHigh 13.5°C · Low 6.5°C · 94 mm rain
- Lower Hutt in SeptemberNew Zealand · 383 kmHigh 13.0°C · Low 8.8°C · 76 mm rain
- Wellington in SeptemberNew Zealand · 392 kmHigh 12.3°C · Low 9.4°C · 74 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 Hamilton) is explained once on the Hamilton, New Zealand year overview and on the Sources, method and limits page.