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September Weather in Wairau Valley, New Zealand

Last updated: August 31, 2025

In September, the average temperature in Wairau Valley, New Zealand hovers around 7°C (45°F). Expect chilly days, with minimums dipping as low as -4°C (25°F) and occasional highs reaching up to 18°C (65°F). With 136 mm (5.3 in) of precipitation spread over 12 days, don’t forget your umbrella! The air is quite humid too, boasting an average of 83% humidity, making it feel even cooler.

September Temperature in Wairau Valley

In September in Wairau Valley, the average temperature is 7°C (45°F). The maximum can reach 18°C (65°F) while the minimum can drop to as low as -4°C (25°F). Be sure to pack layers to stay comfortable during your travels!

September Weather in Wairau Valley: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Wairau Valley, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wairau Valley, September typically has an average temperature of 7°C (45°F), with highs reaching up to 18°C (65°F) and lows dropping to around -4°C (25°F).
JanFebMarAprMayJunJulAugSepOctNovDec615956514642404345505458
Data source: Temperature data for Wairau Valley 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 Wairau Valley

In Wairau Valley in September, the precipitation amount is 136 mm (5.3 in) over the course of 12 days.

September Precipitation Trends in Wairau Valley

The chart displays monthly precipitation patterns in Wairau Valley, 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 Wairau Valley, September typically receives around 136 mm (5.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec829511213813975176127136127132183
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wairau Valley

In Wairau Valley in September, humidity is 83%. With an average temperature of 7°C (45°F), this humidity feels like a chilly blanket wrapping around you, making travel somewhat uncomfortable as you navigate the dampness that settles in your clothes, leading to a heavy and muggy experience outdoors.

September Average Humidity in Wairau Valley

This chart illustrates the average monthly humidity levels in Wairau Valley, 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 Wairau Valley is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%79%80%84%86%86%83%83%82%82%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Wairau Valley

In Wairau Valley 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 Wairau Valley, you can refer to this Hourly UV Index in Wairau Valley.

Maximum UV Index Levels in Wairau Valley for September

The chart shows the monthly maximum UV Index (UVI) for Wairau Valley 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 Wairau Valley typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1313974224691113
Data source: Wairau Valley 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 Wairau Valley Compares to Other Months

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

This table compares monthly weather conditions in Wairau Valley, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (61°F)82 mm (3.2 inches)79%extreme
February Weather15°C (60°F)95 mm (3.7 inches)79%extreme
March Weather13°C (57°F)112 mm (4.4 inches)79%very high
April Weather10°C (51°F)138 mm (5.4 inches)80%high
May Weather8°C (46°F)139 mm (5.5 inches)84%moderate
June Weather5°C (42°F)75 mm (3.0 inches)86%low
July Weather5°C (41°F)176 mm (6.9 inches)86%low
August Weather6°C (43°F)127 mm (5.0 inches)83%moderate
September Weather7°C (45°F)136 mm (5.3 inches)83%high
October Weather10°C (50°F)127 mm (5.0 inches)82%very high
November Weather12°C (54°F)132 mm (5.2 inches)82%extreme
December Weather14°C (58°F)183 mm (7.2 inches)81%extreme

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