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September Weather in Sefton, New Zealand

Last updated: August 31, 2025

In Sefton, New Zealand, the average temperature in September hovers around 10°C (49°F), with a minimum dipping to 2°C (36°F) and a maximum reaching 18°C (64°F). Expect 62 mm (2.4 in) of precipitation spread over 10 days, accompanied by an average humidity of 82%.

September Temperature in Sefton

In September in Sefton, the average temperature is 10°C (49°F). Maximums can reach 18°C (64°F), while minimums can drop to as low as 2°C (36°F). Be prepared for a mix of mild and cool weather, making it a perfect time for light layering during your travels.

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

The chart illustrates September temperature patterns in Sefton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sefton, September typically has an average temperature of 10°C (49°F), with highs reaching up to 18°C (64°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec616159555247464749525659
Data source: Temperature data for Sefton 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 Sefton

In Sefton in September, the total precipitation amount is 62 mm (2.4 in) over a period of 10 days.

September Precipitation Trends in Sefton

The chart displays monthly precipitation patterns in Sefton, 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 Sefton, September typically receives around 62 mm (2.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec5755718573797755627786104
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sefton

In Sefton in September, humidity is 82%. With an average temperature of 10°C (49°F), this humidity feels like a damp chill that clings to your skin, making every step heavy and every breath feel cooler than the air itself, which can dampen the thrill of exploring but also lends a unique atmosphere to your travels.

September Average Humidity in Sefton

This chart illustrates the average monthly humidity levels in Sefton, 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 Sefton is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%72%77%77%82%84%85%83%82%79%77%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sefton

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

Maximum UV Index Levels in Sefton for September

The chart shows the monthly maximum UV Index (UVI) for Sefton 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 Sefton typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1312964224691012
Data source: Sefton 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 Sefton Compares to Other Months

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

This table compares monthly weather conditions in Sefton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather16°C (62°F)57 mm (2.2 inches)72%extreme
February Weather16°C (62°F)55 mm (2.2 inches)72%extreme
March Weather15°C (59°F)71 mm (2.8 inches)77%very high
April Weather13°C (55°F)85 mm (3.4 inches)77%high
May Weather11°C (52°F)73 mm (2.9 inches)82%moderate
June Weather9°C (48°F)79 mm (3.1 inches)84%low
July Weather8°C (46°F)77 mm (3.0 inches)85%low
August Weather8°C (47°F)55 mm (2.2 inches)82%moderate
September Weather10°C (49°F)62 mm (2.4 inches)82%high
October Weather11°C (52°F)77 mm (3.0 inches)79%very high
November Weather13°C (56°F)86 mm (3.4 inches)77%very high
December Weather15°C (59°F)104 mm (4.1 inches)75%extreme

Compare Sefton's Climate with Cities Worldwide