nomadseason

September Weather in Riverton, New Zealand

Last updated: August 31, 2025

In Riverton, New Zealand, the average temperature in September hovers around 9°C (48°F). During this time, temperatures can dip to a chilly -1°C (31°F) or rise to a pleasant 20°C (67°F). With 131 mm (5.2 in) of precipitation spread over 16 days, the average humidity sits at a comfortable 83%.

September Temperature in Riverton

In September in Riverton, the average temperature is 9°C (48°F). Maximums can reach 20°C (67°F) and minimums can be as low as -1°C (31°F). Be prepared for a mix of cool and mild weather, making it a great time for layering your clothing while exploring the area.

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

The chart illustrates September temperature patterns in Riverton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Riverton, September typically has an average temperature of 9°C (48°F), with highs reaching up to 20°C (67°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec585856524944444648515457
Data source: Temperature data for Riverton generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Riverton

In Riverton in September, the precipitation amount is 131 mm (5.2 in) during 16 days, indicating a relatively wet period for the region.

September Precipitation Trends in Riverton

The chart displays monthly precipitation patterns in Riverton, 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 Riverton, September typically receives around 131 mm (5.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec10612794991018510596131126123119
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Riverton

In Riverton in September humidity is 83%. With an average temperature of 9°C (48°F), this humidity feels like an enveloping blanket, making outdoor activities quite uncomfortable and encouraging travelers to seek shelter or shade frequently.

September Average Humidity in Riverton

This chart illustrates the average monthly humidity levels in Riverton, 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 Riverton is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%84%84%85%85%85%84%83%82%83%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Riverton

In Riverton in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Riverton.

Maximum UV Index Levels in Riverton for September

The chart shows the monthly maximum UV Index (UVI) for Riverton 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 Riverton typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec121185322358912
Data source: Riverton 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 Riverton Compares to Other Months

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

This table compares monthly weather conditions in Riverton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)106 mm (4.2 inches)83%extreme
February Weather14°C (58°F)127 mm (5.0 inches)82%extreme
March Weather13°C (57°F)94 mm (3.7 inches)84%very high
April Weather11°C (53°F)99 mm (3.9 inches)84%moderate
May Weather9°C (49°F)101 mm (4.0 inches)85%moderate
June Weather7°C (45°F)85 mm (3.3 inches)85%low
July Weather7°C (44°F)105 mm (4.1 inches)85%low
August Weather8°C (46°F)96 mm (3.8 inches)84%moderate
September Weather9°C (48°F)131 mm (5.2 inches)83%moderate
October Weather10°C (51°F)126 mm (4.9 inches)82%very high
November Weather12°C (54°F)123 mm (4.9 inches)82%very high
December Weather14°C (57°F)119 mm (4.7 inches)83%extreme

Compare Riverton's Climate with Cities Worldwide