September Weather in Riwaka, New Zealand

Last updated: August 31, 2025

In September, the average temperature in Riwaka, New Zealand hovers around 10°C (51°F), with a minimum of 4°C (39°F) and a maximum reaching 16°C (61°F). Expect 125 mm (4.9 in) of precipitation spread over approximately 12 days, contributing to an average humidity of 83%. Prepare for a mix of mild weather and occasional showers!

September Temperature in Riwaka

In September in Riwaka, the average temperature is 10°C (51°F), with maximums reaching 16°C (61°F) and minimums dropping to as low as 4°C (39°F). This mild climate makes it a pleasant destination for exploring outdoor activities and sightseeing.

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

The chart illustrates September temperature patterns in Riwaka, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riwaka, September typically has an average temperature of 10°C (51°F), with highs reaching up to 16°C (61°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Riwaka

In Riwaka in September, the total precipitation amount is 125 mm (4.9 in) spread over 12 days.

September Precipitation Trends in Riwaka

The chart displays monthly precipitation patterns in Riwaka, 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 Riwaka, September typically receives around 125 mm (4.9 inches) of precipitation spread over approximately 12 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 Riwaka

In Riwaka in September, humidity is 83%. With an average temperature of 10°C (51°F), this humidity feels like a chilly dampness that permeates your clothes, making it essential to dress in layers for travel, as the cool air combined with the high humidity can create an uncomfortable and bone-chilling atmosphere.

September Average Humidity in Riwaka

This chart illustrates the average monthly humidity levels in Riwaka, 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 Riwaka is approximately 83%, 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 Riwaka

In Riwaka in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Riwaka, you can refer to this Hourly UV Index in Riwaka.

Maximum UV Index Levels in Riwaka for September

The chart shows the monthly maximum UV Index (UVI) for Riwaka 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 Riwaka typically reaches 6, which falls under the high exposure category.

Data source: Riwaka 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 Riwaka Compares to Other Months

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

This table compares monthly weather conditions in Riwaka, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	18°C (64°F)	85 mm (3.4 inches)	79%	extreme
February Weather	17°C (63°F)	94 mm (3.7 inches)	79%	extreme
March Weather	16°C (61°F)	128 mm (5.0 inches)	79%	very high
April Weather	14°C (57°F)	154 mm (6.1 inches)	80%	high
May Weather	12°C (54°F)	168 mm (6.6 inches)	84%	moderate
June Weather	10°C (50°F)	86 mm (3.4 inches)	86%	low
July Weather	9°C (48°F)	184 mm (7.3 inches)	86%	low
August Weather	9°C (49°F)	156 mm (6.2 inches)	83%	moderate
September Weather	10°C (51°F)	125 mm (4.9 inches)	83%	high
October Weather	12°C (54°F)	137 mm (5.4 inches)	82%	very high
November Weather	14°C (58°F)	132 mm (5.2 inches)	82%	extreme
December Weather	16°C (62°F)	151 mm (5.9 inches)	81%	extreme