Climate averages 1991–2020
New Plymouth weather
in September.
A cool, wet month: the 9th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a cool month in New Plymouth: daytime highs average 13.4°C and nights cool to about 8.3°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 173 mm of rain on roughly 16 days, which makes September a wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 11 h 48 min on an average September day.
The nearest other city in this atlas is Hamilton, New Zealand (177 km away). In September its highs average 14.8°C, 1.4°C warmer than New Plymouth, with 114 mm of rain.
Among the 11 cities listed in New Zealand, New Plymouth ranks joint 7th of 11 for the warmest September highs and 11th of 11 for the driest September (rainfall, lowest first). The mean September high of those 11 cities is 13.8°C; New Plymouth is 0.4°C cooler than that mean.
From September to October, average highs rise by 1.3°C to 14.7°C, and monthly rainfall falls from 173 mm to 171 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
New Plymouth climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 20.0°C14.2°C | 14.2°C | 106 | 10.3 | 14.615 h |
| February | 20.7°C14.9°C | 14.9°C | 104 | 9.0 | 13.614 h |
| March | 19.2°C13.6°C | 13.6°C | 109 | 10.5 | 12.412 h |
| April | 16.9°C11.7°C | 11.7°C | 154 | 12.6 | 11.111 h |
| May | 14.7°C10.2°C | 10.2°C | 183 | 14.1 | 10.010 h |
| June | 12.7°C8.3°C | 8.3°C | 185 | 14.7 | 9.59 h |
| July | 11.9°C7.2°C | 7.2°C | 189 | 16.2 | 9.710 h |
| August | 12.4°C7.3°C | 7.3°C | 177 | 16.0 | 10.611 h |
| September, selected | 13.4°C8.3°C | 8.3°C | 173 | 15.6 | 11.812 h |
| October | 14.7°C9.5°C | 9.5°C | 171 | 14.9 | 13.113 h |
| November | 16.3°C10.7°C | 10.7°C | 134 | 12.4 | 14.214 h |
| December | 18.4°C12.9°C | 12.9°C | 160 | 13.4 | 14.815 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
- Hamilton, New Zealand in SeptemberNew Zealand · 177 kmHigh 14.8°C · Low 7.1°C · 114 mm rain
- Palmerston North in SeptemberNew Zealand · 194 kmHigh 13.5°C · Low 6.5°C · 94 mm rain
- Tauranga in SeptemberNew Zealand · 238 kmHigh 14.8°C · Low 8.8°C · 112 mm rain
- Manukau City in SeptemberNew Zealand · 241 kmHigh 15.0°C · Low 9.5°C · 86 mm rain
- Hastings, New Zealand in SeptemberNew Zealand · 246 kmHigh 14.9°C · Low 6.9°C · 60 mm rain
- Lower Hutt in SeptemberNew Zealand · 249 kmHigh 13.0°C · Low 8.8°C · 76 mm rain
- Auckland in SeptemberNew Zealand · 254 kmHigh 15.0°C · Low 10.0°C · 93 mm rain
- Wellington in SeptemberNew Zealand · 254 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 New Plymouth) is explained once on the New Plymouth year overview and on the Sources, method and limits page.