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September Weather in Helensville, New Zealand

Last updated: August 31, 2025

In Helensville, New Zealand, the average temperature in September hovers around 13°C (56°F). Expect temperatures to range from a cool 8°C (46°F) at the minimum to a pleasant 19°C (67°F) at the maximum. You might encounter precipitation totaling 116 mm (4.6 in) over 16 days, accompanied by an average humidity of 80%. Stay prepared for a month that balances cool breezes with occasional rain!

September Temperature in Helensville

In September, in Helensville, the average temperature is 13°C (56°F). The maximum can reach 19°C (67°F), and the minimum can be as low as 8°C (46°F). This mild climate makes Helensville a great destination for travelers looking to enjoy comfortable weather.

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

The chart illustrates September temperature patterns in Helensville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helensville, September typically has an average temperature of 13°C (56°F), with highs reaching up to 19°C (67°F) and lows dropping to around 8°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec686967646057555556596266
Data source: Temperature data for Helensville 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 Helensville

In Helensville in September, the precipitation amount is 116 mm (4.6 in) over a period of 16 days.

September Precipitation Trends in Helensville

The chart displays monthly precipitation patterns in Helensville, 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 Helensville, September typically receives around 116 mm (4.6 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec55758510495111120130116858071
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Helensville

In Helensville in September humidity is 80%. With average temperature 13°C (56°F) this humidity feels like a damp chill that seeps into your bones, making outdoor exploration more challenging and necessitating layered clothing for comfort.

September Average Humidity in Helensville

This chart illustrates the average monthly humidity levels in Helensville, 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 Helensville is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%76%74%75%80%82%83%81%80%80%80%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Helensville

In Helensville in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Helensville.

Maximum UV Index Levels in Helensville for September

The chart shows the monthly maximum UV Index (UVI) for Helensville 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 Helensville typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141410743357101113
Data source: Helensville 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 Helensville Compares to Other Months

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

This table compares monthly weather conditions in Helensville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (68°F)55 mm (2.2 inches)79%extreme
February Weather21°C (69°F)75 mm (2.9 inches)76%extreme
March Weather20°C (67°F)85 mm (3.3 inches)74%very high
April Weather18°C (64°F)104 mm (4.1 inches)74%high
May Weather15°C (60°F)95 mm (3.7 inches)80%moderate
June Weather14°C (57°F)111 mm (4.4 inches)82%moderate
July Weather13°C (55°F)120 mm (4.7 inches)83%moderate
August Weather13°C (55°F)130 mm (5.1 inches)80%moderate
September Weather13°C (56°F)116 mm (4.6 inches)80%high
October Weather15°C (59°F)85 mm (3.4 inches)80%very high
November Weather17°C (62°F)80 mm (3.2 inches)80%extreme
December Weather19°C (66°F)71 mm (2.8 inches)78%extreme

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