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September Weather in Forest Lake, United States

Last updated: June 24, 2025

In September, the average temperature in Forest Lake, United States is a pleasant 18°C (64°F). However, temperatures can vary significantly, with a minimum of 1°C (35°F) and a maximum reaching 32°C (91°F). Rainfall is also a factor to consider, with an average precipitation of 111 mm (4.4 in) spread over about 10 days. Coupled with an average humidity of 81%, it's clear that Forest Lake offers a unique climate experience this month!

September Temperature in Forest Lake

In September in Forest Lake, the average temperature is 18°C (64°F). Maximum temperatures can reach 32°C (91°F), while minimums can drop as low as 1°C (35°F). Overall, it's a great time to visit Forest Lake, as you can experience a pleasant mix of warm and cooler days perfect for exploring.

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

The chart illustrates September temperature patterns in Forest Lake, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Forest Lake, September typically has an average temperature of 18°C (64°F), with highs reaching up to 32°C (91°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec161632435971747064483323
Data source: Temperature data for Forest Lake 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 Lake

In Forest Lake in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Forest Lake

The chart displays monthly precipitation patterns in Forest Lake, 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 Lake, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec24345390122851051281111043752
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Forest Lake

In Forest Lake in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.

September Average Humidity in Forest Lake

This chart illustrates the average monthly humidity levels in Forest Lake, 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 Lake is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%90%85%84%78%80%81%81%81%84%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Forest Lake

In Forest Lake in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Forest Lake.

Maximum UV Index Levels in Forest Lake for September

The chart shows the monthly maximum UV Index (UVI) for Forest Lake 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 Lake typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457810997532
Data source: Forest Lake 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 Lake Compares to Other Months

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

This table compares monthly weather conditions in Forest Lake, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (16°F)24 mm (0.9 inches)87%low
February Weather-9°C (17°F)34 mm (1.3 inches)90%moderate
March Weather0°C (33°F)53 mm (2.1 inches)85%moderate
April Weather6°C (43°F)90 mm (3.5 inches)84%high
May Weather15°C (59°F)122 mm (4.8 inches)78%very high
June Weather22°C (71°F)85 mm (3.3 inches)80%very high
July Weather23°C (74°F)105 mm (4.1 inches)81%very high
August Weather21°C (71°F)128 mm (5.1 inches)81%very high
September Weather18°C (64°F)111 mm (4.4 inches)81%high
October Weather9°C (48°F)104 mm (4.1 inches)84%moderate
November Weather0°C (33°F)37 mm (1.4 inches)88%moderate
December Weather-5°C (23°F)52 mm (2.0 inches)84%low

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