September Weather in Wellington, United States

Last updated: June 24, 2025

In Wellington, United States, the average temperature in September hovers around 20°C (68°F), offering a pleasant climate. Expect a range that dips to a minimum of 7°C (44°F) and peaks at 31°C (89°F). During this month, you can anticipate around 86 mm (3.4 in) of precipitation spread over 10 days, contributing to an average humidity level of 77%. Enjoy the unique weather while you explore!

September Temperature in Wellington

In September in Wellington, the average temperature is 20°C (68°F). Maximum temperatures can reach up to 31°C (89°F), while minimums can drop as low as 7°C (44°F). It's a great time to visit Wellington, as you can enjoy pleasantly warm days and cooler evenings.

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 20°C (68°F), with highs reaching up to 31°C (89°F) and lows dropping to around 7°C (44°F).

Data source: Temperature data for Wellington generated using information from the Copernicus Climate Change Service.

September Precipitation in Wellington

In Wellington in September, the precipitation amount is 86 mm (3.4 in) over the course of 10 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 86 mm (3.4 inches) of precipitation spread over approximately 10 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Wellington

In Wellington in September, humidity is 77%. With an average temperature of 20°C (68°F), this humidity feels like a warm, sticky embrace, making it essential for travelers to stay hydrated and take breaks in shaded areas to avoid feeling sluggish in the heat.

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 77%, offering insight into how humid the weather typically is during this month.

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 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 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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-1°C (30°F)	86 mm (3.4 inches)	88%	moderate
February Weather	0°C (32°F)	97 mm (3.8 inches)	88%	moderate
March Weather	4°C (39°F)	99 mm (3.9 inches)	87%	high
April Weather	9°C (49°F)	124 mm (4.9 inches)	87%	very high
May Weather	16°C (61°F)	126 mm (5.0 inches)	81%	very high
June Weather	21°C (70°F)	129 mm (5.1 inches)	83%	very high
July Weather	24°C (75°F)	124 mm (4.9 inches)	82%	very high
August Weather	23°C (73°F)	91 mm (3.6 inches)	76%	very high
September Weather	20°C (68°F)	86 mm (3.4 inches)	77%	very high
October Weather	14°C (57°F)	107 mm (4.2 inches)	82%	high
November Weather	5°C (42°F)	100 mm (3.9 inches)	89%	moderate
December Weather	2°C (35°F)	92 mm (3.6 inches)	86%	low