September Weather in Wellington, United States

Last updated: June 24, 2025

In September, the average temperature in Wellington, United States is a pleasant 23°C (75°F), making it a delightful time to explore. However, be prepared for a temperature range that can dip to a minimum of 6°C (42°F) and soar up to a maximum of 37°C (98°F). During this month, expect 77 mm (3.1 in) of precipitation spread over about 7 days, contributing to an average humidity of 67%. So, pack accordingly to enjoy everything this beautiful destination has to offer!

September Temperature in Wellington

In September in Wellington, the average temperature is 23°C (75°F), with maximums reaching 37°C (98°F) and minimums dropping as low as 6°C (42°F). Be prepared for a diverse range of temperatures when planning 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 23°C (75°F), with highs reaching up to 37°C (98°F) and lows dropping to around 6°C (42°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 total precipitation amount is 77 mm (3.1 in) over the course of 7 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 77 mm (3.1 inches) of precipitation spread over approximately 7 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 67%. With an average temperature of 23°C (75°F), this humidity feels like a warm, sultry embrace that can make outdoor activities feel a bit sticky, urging travelers to seek shade or a refreshing drink as they explore.

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 67%, 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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, 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	2°C (35°F)	43 mm (1.7 inches)	77%	moderate
February Weather	2°C (36°F)	32 mm (1.3 inches)	76%	high
March Weather	10°C (50°F)	84 mm (3.3 inches)	71%	high
April Weather	14°C (57°F)	91 mm (3.6 inches)	73%	very high
May Weather	20°C (68°F)	170 mm (6.7 inches)	83%	very high
June Weather	26°C (79°F)	108 mm (4.3 inches)	83%	extreme
July Weather	27°C (82°F)	58 mm (2.3 inches)	81%	extreme
August Weather	26°C (79°F)	96 mm (3.8 inches)	73%	very high
September Weather	23°C (75°F)	77 mm (3.1 inches)	67%	very high
October Weather	15°C (59°F)	136 mm (5.4 inches)	72%	high
November Weather	8°C (47°F)	25 mm (1.0 inches)	82%	moderate
December Weather	5°C (40°F)	30 mm (1.2 inches)	85%	moderate