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September Weather in Forest Hills, United States

Last updated: June 24, 2025

In September, the average temperature in Forest Hills, United States hovers around 19°C (67°F). Expect a range with minimums dropping to 4°C (40°F) and maximums soaring up to 34°C (93°F). Be prepared for some rain, as 124 mm (4.9 in) of precipitation is likely over about 10 days, contributing to an average humidity of 67%.

September Temperature in Forest Hills

In September in Forest Hills, the average temperature is 19°C (67°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 4°C (40°F). Travelers should prepare for a wide range of temperatures and pack accordingly.

September Weather in Forest Hills: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Forest Hills, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest Hills, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec313541516270757367574236
Data source: Temperature data for Forest Hills 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 Forest Hills

In Forest Hills in September, the precipitation amount is 124 mm (4.9 in) spread over a duration of 10 days.

September Precipitation Trends in Forest Hills

The chart displays monthly precipitation patterns in Forest Hills, 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 Forest Hills, September typically receives around 124 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec951271091301561531488812412495103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Forest Hills

In Forest Hills in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.

September Average Humidity in Forest Hills

This chart illustrates the average monthly humidity levels in Forest Hills, 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 Forest Hills 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 Forest Hills

In Forest Hills 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 Forest Hills.

Maximum UV Index Levels in Forest Hills for September

The chart shows the monthly maximum UV Index (UVI) for Forest Hills 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 Forest Hills typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098642
Data source: Forest Hills 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 Forest Hills Compares to Other Months

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

This table compares monthly weather conditions in Forest Hills, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)95 mm (3.7 inches)89%moderate
February Weather2°C (35°F)127 mm (5.0 inches)90%moderate
March Weather5°C (41°F)109 mm (4.3 inches)89%high
April Weather11°C (51°F)130 mm (5.1 inches)88%very high
May Weather17°C (62°F)156 mm (6.1 inches)80%very high
June Weather21°C (70°F)153 mm (6.0 inches)79%very high
July Weather24°C (75°F)148 mm (5.8 inches)74%very high
August Weather23°C (73°F)88 mm (3.5 inches)64%very high
September Weather19°C (67°F)124 mm (4.9 inches)67%very high
October Weather14°C (57°F)124 mm (4.9 inches)81%high
November Weather5°C (42°F)95 mm (3.7 inches)89%moderate
December Weather2°C (36°F)103 mm (4.1 inches)88%low

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