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September Weather in Forest, United States

Last updated: June 24, 2025

In Forest, United States, the average temperature in September hovers around 20°C (68°F). However, temperatures can vary significantly, with a minimum of 4°C (40°F) and a maximum reaching 34°C (93°F). During this month, expect around 75 mm (2.9 in) of precipitation over approximately 8 days, contributing to an average humidity level of 78%.

September Temperature in Forest

In September in Forest, the average temperature is 20°C (68°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 4°C (40°F). This variety in temperature makes it a great time for travelers to enjoy both outdoor activities and cozy indoor experiences.

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

The chart illustrates September temperature patterns in Forest, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec293241506371757268574135
Data source: Temperature data for Forest 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

In Forest in September, the precipitation amount is 75 mm (2.9 in) over a span of 8 days.

September Precipitation Trends in Forest

The chart displays monthly precipitation patterns in Forest, 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, September typically receives around 75 mm (2.9 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec72941001111341341179175978972
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Forest

In Forest in September humidity is 78%. With an average temperature of 20°C (68°F), this humidity feels like a warm, enveloping blanket that makes exploring the sights a bit sticky, so travelers should stay hydrated and take frequent breaks in the shade.

September Average Humidity in Forest

This chart illustrates the average monthly humidity levels in Forest, 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 is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Forest

In Forest 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.

Maximum UV Index Levels in Forest for September

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

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

This table compares monthly weather conditions in Forest, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (30°F)72 mm (2.8 inches)88%moderate
February Weather0°C (32°F)94 mm (3.7 inches)87%moderate
March Weather5°C (41°F)100 mm (3.9 inches)87%high
April Weather10°C (51°F)111 mm (4.4 inches)87%very high
May Weather17°C (63°F)134 mm (5.3 inches)81%very high
June Weather22°C (72°F)134 mm (5.3 inches)82%very high
July Weather24°C (75°F)117 mm (4.6 inches)81%very high
August Weather22°C (73°F)91 mm (3.6 inches)78%very high
September Weather20°C (68°F)75 mm (2.9 inches)78%very high
October Weather14°C (57°F)97 mm (3.8 inches)82%high
November Weather5°C (42°F)89 mm (3.5 inches)89%moderate
December Weather2°C (35°F)72 mm (2.8 inches)86%low

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