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September Weather in Carterton, New Zealand

Last updated: August 31, 2025

In September, the average temperature in Carterton, New Zealand hovers around 9°C (49°F). Expect a chilly minimum of -1°C (31°F), while daytime highs can reach up to 18°C (64°F). Be prepared for wet weather, as 113 mm (4.5 in) of precipitation may fall over 15 days, contributing to an average humidity of 80%.

September Temperature in Carterton

In September in Carterton, the average temperature is 9°C (49°F), with maximums reaching 18°C (64°F) and minimums dropping as low as -1°C (31°F). Travelers should be prepared for a cool and variable climate during this time.

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

The chart illustrates September temperature patterns in Carterton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Carterton, September typically has an average temperature of 9°C (49°F), with highs reaching up to 18°C (64°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec626259545147454648525659
Data source: Temperature data for Carterton 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 Carterton

In Carterton in September, the precipitation amount is 113 mm (4.5 in) over the course of 15 days.

September Precipitation Trends in Carterton

The chart displays monthly precipitation patterns in Carterton, 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 Carterton, September typically receives around 113 mm (4.5 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec62688411069101989011395110143
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Carterton

In Carterton in September, humidity is 80%. With an average temperature of 9°C (49°F), this humidity feels like a damp chill that seeps into your bones, making outdoor activities less enjoyable and prompting a need for layered clothing to stay comfortable while traveling.

September Average Humidity in Carterton

This chart illustrates the average monthly humidity levels in Carterton, 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 Carterton is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%76%77%82%83%84%81%80%79%78%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Carterton

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

Maximum UV Index Levels in Carterton for September

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

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

This table compares monthly weather conditions in Carterton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather17°C (62°F)62 mm (2.4 inches)75%extreme
February Weather16°C (62°F)68 mm (2.7 inches)76%extreme
March Weather15°C (59°F)84 mm (3.3 inches)75%very high
April Weather12°C (55°F)110 mm (4.3 inches)77%high
May Weather10°C (51°F)69 mm (2.7 inches)82%moderate
June Weather8°C (47°F)101 mm (4.0 inches)83%low
July Weather7°C (46°F)98 mm (3.9 inches)83%low
August Weather8°C (47°F)90 mm (3.6 inches)81%moderate
September Weather9°C (49°F)113 mm (4.5 inches)80%high
October Weather11°C (52°F)95 mm (3.7 inches)79%very high
November Weather13°C (56°F)110 mm (4.3 inches)78%extreme
December Weather15°C (60°F)143 mm (5.6 inches)75%extreme

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