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September Weather in Richmond Hill, United States

Last updated: June 24, 2025

In Richmond Hill, United States, the average temperature in September hovers around 26°C (78°F), making it a pleasant time to visit. Expect a minimum chill of 13°C (55°F) and a sweltering maximum of 36°C (97°F). During this month, you can anticipate 121 mm (4.7 in) of rainfall spread over about 15 days, contributing to an average humidity of 83%.

September Temperature in Richmond Hill

In September in Richmond Hill, the average temperature is 26°C (78°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 13°C (55°F). This makes it an ideal time for travelers seeking warm weather while enjoying the pleasant evenings.

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

The chart illustrates September temperature patterns in Richmond Hill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Richmond Hill, September typically has an average temperature of 26°C (78°F), with highs reaching up to 36°C (97°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec525861677579828178725955
Data source: Temperature data for Richmond 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 Richmond Hill

In Richmond Hill in September, the precipitation amount is 121 mm (4.7 in) over a period of 15 days.

September Precipitation Trends in Richmond Hill

The chart displays monthly precipitation patterns in Richmond 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 Richmond Hill, September typically receives around 121 mm (4.7 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec577863741011501681771218085114
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Richmond Hill

In Richmond Hill in September, humidity is 83%. With an average temperature of 26°C (78°F), this humidity feels like a heavy blanket wrapping around you, making travel a sticky affair as sweat lingers on your skin and every step requires extra effort.

September Average Humidity in Richmond Hill

This chart illustrates the average monthly humidity levels in Richmond 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 Richmond Hill is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%79%78%73%72%74%82%82%83%79%82%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Richmond Hill

In Richmond Hill in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Richmond Hill.

Maximum UV Index Levels in Richmond Hill for September

The chart shows the monthly maximum UV Index (UVI) for Richmond 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 Richmond Hill typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec479101111111110864
Data source: Richmond 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 Richmond Hill Compares to Other Months

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

This table compares monthly weather conditions in Richmond Hill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (53°F)57 mm (2.2 inches)84%moderate
February Weather14°C (58°F)78 mm (3.1 inches)79%high
March Weather16°C (62°F)63 mm (2.5 inches)78%very high
April Weather19°C (67°F)74 mm (2.9 inches)72%very high
May Weather24°C (75°F)101 mm (4.0 inches)72%extreme
June Weather26°C (79°F)150 mm (5.9 inches)74%extreme
July Weather28°C (82°F)168 mm (6.6 inches)82%extreme
August Weather27°C (81°F)177 mm (7.0 inches)82%extreme
September Weather26°C (78°F)121 mm (4.7 inches)83%very high
October Weather22°C (72°F)80 mm (3.2 inches)79%very high
November Weather15°C (59°F)85 mm (3.3 inches)82%high
December Weather13°C (55°F)114 mm (4.5 inches)85%moderate

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