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September Weather in Chester Hill, United States

Last updated: June 24, 2025

In September, the average temperature in Chester Hill, United States hovers around 18°C (64°F), with a minimum dipping to 1°C (34°F) and a maximum soaring to 31°C (89°F). Expect 122 mm (4.8 in) of precipitation over approximately 11 days, accompanied by an average humidity level of 67%. Come prepared for a mix of weather!

September Temperature in Chester Hill

In September in Chester Hill, the average temperature is 18°C (64°F). Maximum temperatures can reach 31°C (89°F), while minimums can dip as low as 1°C (34°F). This variation in weather makes it essential to pack layered clothing for your travels.

September Weather in Chester Hill: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Chester Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chester Hill, September typically has an average temperature of 18°C (64°F), with highs reaching up to 31°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec273137485967727064543933
Data source: Temperature data for Chester Hill 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 Chester Hill

In Chester Hill in September, the total precipitation amount is 122 mm (4.8 in) over a span of 11 days.

September Precipitation Trends in Chester Hill

The chart displays monthly precipitation patterns in Chester Hill, 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 Chester Hill, September typically receives around 122 mm (4.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec79109921191451151211071221178795
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Chester Hill

In Chester Hill in September humidity is 67%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel quite comfortable but slightly sticky, encouraging lightweight clothing and the occasional refreshing break in the shade.

September Average Humidity in Chester Hill

This chart illustrates the average monthly humidity levels in Chester Hill, 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 Chester Hill is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Chester Hill

In Chester Hill in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Chester Hill.

Maximum UV Index Levels in Chester Hill for September

The chart shows the monthly maximum UV Index (UVI) for Chester Hill 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 Chester Hill typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Chester Hill 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 Chester Hill Compares to Other Months

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

This table compares monthly weather conditions in Chester Hill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)79 mm (3.1 inches)89%moderate
February Weather-1°C (31°F)109 mm (4.3 inches)90%moderate
March Weather3°C (38°F)92 mm (3.6 inches)89%high
April Weather9°C (48°F)119 mm (4.7 inches)88%very high
May Weather15°C (59°F)145 mm (5.7 inches)80%very high
June Weather19°C (67°F)115 mm (4.5 inches)79%very high
July Weather22°C (72°F)121 mm (4.8 inches)74%very high
August Weather21°C (71°F)107 mm (4.2 inches)64%very high
September Weather18°C (64°F)122 mm (4.8 inches)67%very high
October Weather12°C (54°F)117 mm (4.6 inches)81%high
November Weather4°C (39°F)87 mm (3.4 inches)89%moderate
December Weather0°C (33°F)95 mm (3.8 inches)88%low

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