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September Weather in New Plymouth, United States

Last updated: June 24, 2025

In September, the average temperature in New Plymouth, United States hovers around 20°C (69°F). However, be prepared for a range of temperatures, with minimums dipping to 4°C (40°F) and maximums soaring up to 39°C (103°F). During this time, expect 12 mm (0.5 in) of precipitation over about 2 days, and enjoy a comfortable average humidity level of 48%.

September Temperature in New Plymouth

In September in New Plymouth, the average temperature is 20°C (69°F). Maximum temperatures can reach 39°C (103°F), while minimums can drop to as low as 4°C (40°F). Travelers should be prepared for a wide range of temperatures during this time.

September Weather in New Plymouth: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in New Plymouth, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In New Plymouth, September typically has an average temperature of 20°C (69°F), with highs reaching up to 39°C (103°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec323546536272828069534234
Data source: Temperature data for New Plymouth generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in New Plymouth

In New Plymouth in September, the precipitation amount is 12 mm (0.5 in) over the course of 2 days.

September Precipitation Trends in New Plymouth

The chart displays monthly precipitation patterns in New Plymouth, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In New Plymouth, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec4855413134191813203537
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in New Plymouth

In New Plymouth in September humidity is 48%. With an average temperature of 20°C (69°F), this humidity feels like a pleasant embrace, making it comfortable for exploring the outdoors and enjoying scenic attractions without feeling overly sticky or uncomfortable.

September Average Humidity in New Plymouth

This chart illustrates the average monthly humidity levels in New Plymouth, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in New Plymouth is approximately 48%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%89%85%79%71%71%66%50%48%65%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in New Plymouth

In New Plymouth in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in New Plymouth.

Maximum UV Index Levels in New Plymouth for September

The chart shows the monthly maximum UV Index (UVI) for New Plymouth in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in New Plymouth typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346710111098542
Data source: New Plymouth September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in New Plymouth Compares to Other Months

Weather in New Plymouth varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in New Plymouth, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in New Plymouth, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)48 mm (1.9 inches)88%moderate
February Weather2°C (36°F)55 mm (2.2 inches)89%moderate
March Weather8°C (46°F)41 mm (1.6 inches)85%high
April Weather11°C (53°F)31 mm (1.2 inches)79%high
May Weather17°C (62°F)34 mm (1.3 inches)71%very high
June Weather22°C (72°F)19 mm (0.8 inches)71%extreme
July Weather28°C (83°F)1 mm (0.0 inches)66%very high
August Weather27°C (80°F)8 mm (0.3 inches)50%very high
September Weather20°C (69°F)12 mm (0.5 inches)48%very high
October Weather12°C (53°F)20 mm (0.8 inches)65%moderate
November Weather6°C (42°F)35 mm (1.4 inches)84%moderate
December Weather1°C (34°F)37 mm (1.5 inches)87%low

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