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September Weather in Portobello, New Zealand

Last updated: August 31, 2025

In September, the average temperature in Portobello, New Zealand hovers around 9°C (48°F), with minimums dipping to 1°C (34°F) and maximums reaching up to 19°C (67°F). Expect some rainy days with precipitation totaling 56 mm (2.2 in) over approximately 11 days. The air remains quite humid, averaging around 83% — perfect for those who appreciate a touch of moisture in the atmosphere!

September Temperature in Portobello

In September in Portobello, the average temperature is 9°C (48°F). The maximum can reach 19°C (67°F), while the minimum can drop as low as 1°C (34°F). Dress in layers to comfortably enjoy your travels in Portobello this month.

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

The chart illustrates September temperature patterns in Portobello, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Portobello, September typically has an average temperature of 9°C (48°F), with highs reaching up to 19°C (67°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec595857534945444648515457
Data source: Temperature data for Portobello 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 Portobello

In Portobello in September, the precipitation amount is 56 mm (2.2 in) over the course of 11 days.

September Precipitation Trends in Portobello

The chart displays monthly precipitation patterns in Portobello, 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 Portobello, September typically receives around 56 mm (2.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec909148735043684156768488
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Portobello

In Portobello 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 Portobello

This chart illustrates the average monthly humidity levels in Portobello, 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 Portobello is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec79%76%78%81%84%85%85%84%83%80%78%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Portobello

In Portobello 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 Portobello.

Maximum UV Index Levels in Portobello for September

The chart shows the monthly maximum UV Index (UVI) for Portobello 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 Portobello typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1311853223581012
Data source: Portobello 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 Portobello Compares to Other Months

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

This table compares monthly weather conditions in Portobello, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather15°C (59°F)90 mm (3.5 inches)79%extreme
February Weather15°C (59°F)91 mm (3.6 inches)76%extreme
March Weather14°C (57°F)48 mm (1.9 inches)78%very high
April Weather12°C (53°F)73 mm (2.9 inches)81%moderate
May Weather9°C (49°F)50 mm (2.0 inches)84%moderate
June Weather7°C (45°F)43 mm (1.7 inches)85%low
July Weather7°C (44°F)68 mm (2.7 inches)85%low
August Weather8°C (46°F)41 mm (1.6 inches)84%moderate
September Weather9°C (48°F)56 mm (2.2 inches)83%moderate
October Weather10°C (51°F)76 mm (3.0 inches)80%very high
November Weather12°C (55°F)84 mm (3.3 inches)78%very high
December Weather14°C (57°F)88 mm (3.5 inches)81%extreme

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