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September Weather in Flat River, United States

Last updated: June 24, 2025

In September, the average temperature in Flat River, United States is a pleasant 22°C (71°F). However, be prepared for a temperature range that can dive as low as 7°C (45°F) and soar up to 35°C (94°F). During this month, expect about 66 mm (2.6 in) of precipitation over 7 days, accompanied by an average humidity level of 68%.

September Temperature in Flat River

In September in Flat River, the average temperature is 22°C (71°F). The maximum can reach 35°C (94°F), while the minimum can drop to as low as 7°C (45°F). This variability makes it essential for travelers to pack layers and prepare for both warm and cooler conditions.

September Weather in Flat River: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Flat River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flat River, September typically has an average temperature of 22°C (71°F), with highs reaching up to 35°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec343747556675797571594440
Data source: Temperature data for Flat River 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 Flat River

In Flat River in September, the precipitation amount is 66 mm (2.6 in) over a period of 7 days.

September Precipitation Trends in Flat River

The chart displays monthly precipitation patterns in Flat River, 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 Flat River, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec801001341711519088119661157570
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Flat River

In Flat River in September, humidity is 68%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making traveling quite pleasant yet slightly sticky as you explore the sights.

September Average Humidity in Flat River

This chart illustrates the average monthly humidity levels in Flat River, 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 Flat River is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%81%80%80%83%83%76%69%68%72%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Flat River

In Flat River in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Flat River.

Maximum UV Index Levels in Flat River for September

The chart shows the monthly maximum UV Index (UVI) for Flat River 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 Flat River typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3679111111109753
Data source: Flat River 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 Flat River Compares to Other Months

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

This table compares monthly weather conditions in Flat River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)80 mm (3.2 inches)83%moderate
February Weather3°C (37°F)100 mm (3.9 inches)81%high
March Weather9°C (48°F)134 mm (5.3 inches)80%high
April Weather13°C (55°F)171 mm (6.7 inches)80%very high
May Weather19°C (66°F)150 mm (5.9 inches)83%extreme
June Weather24°C (75°F)90 mm (3.5 inches)83%extreme
July Weather26°C (79°F)87 mm (3.4 inches)76%extreme
August Weather24°C (76°F)119 mm (4.7 inches)69%very high
September Weather22°C (71°F)66 mm (2.6 inches)68%very high
October Weather15°C (59°F)115 mm (4.5 inches)72%high
November Weather7°C (45°F)75 mm (3.0 inches)83%moderate
December Weather4°C (40°F)70 mm (2.8 inches)86%moderate

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