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September Weather in Wellington, United States

Last updated: June 24, 2025

In September, the average temperature in Wellington, United States is a pleasant 19°C (66°F). However, temperatures can fluctuate significantly, with a minimum of -2°C (29°F) and a maximum of 35°C (96°F). Expect a modest precipitation of 12 mm (0.5 in) spread over just 2 days, along with an average humidity of 47%, creating a diverse and dynamic climate for the month.

September Temperature in Wellington

In September in Wellington, the average temperature is 19°C (66°F). Maximums can reach 35°C (96°F), while minimums can drop as low as -2°C (29°F). It's advisable to pack both light clothing for warm days and warmer layers for chilly evenings during your travels.

September Weather in Wellington: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Wellington, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wellington, September typically has an average temperature of 19°C (66°F), with highs reaching up to 35°C (96°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec242940495871777565483827
Data source: Temperature data for Wellington 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 Wellington

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

September Precipitation Trends in Wellington

The chart displays monthly precipitation patterns in Wellington, 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 Wellington, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec2627311123891212201824
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wellington

In Wellington in September, humidity is 47%. With an average temperature of 19°C (66°F), this humidity feels like a comfortable embrace, making it pleasant for traveling as you explore the sights without feeling overheated.

September Average Humidity in Wellington

This chart illustrates the average monthly humidity levels in Wellington, 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 Wellington is approximately 47%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%77%70%54%45%37%34%47%67%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wellington

In Wellington in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Wellington.

Maximum UV Index Levels in Wellington for September

The chart shows the monthly maximum UV Index (UVI) for Wellington 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 Wellington typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Wellington 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 Wellington Compares to Other Months

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

This table compares monthly weather conditions in Wellington, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (24°F)26 mm (1.0 inches)87%moderate
February Weather-2°C (30°F)27 mm (1.0 inches)88%high
March Weather5°C (41°F)31 mm (1.2 inches)77%very high
April Weather9°C (49°F)11 mm (0.4 inches)69%very high
May Weather14°C (58°F)23 mm (0.9 inches)54%extreme
June Weather22°C (71°F)8 mm (0.3 inches)45%extreme
July Weather25°C (78°F)9 mm (0.4 inches)37%extreme
August Weather24°C (75°F)12 mm (0.5 inches)34%extreme
September Weather19°C (66°F)12 mm (0.5 inches)47%very high
October Weather9°C (48°F)20 mm (0.8 inches)67%high
November Weather3°C (39°F)18 mm (0.7 inches)82%moderate
December Weather-3°C (27°F)24 mm (0.9 inches)87%moderate

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