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September Weather in Monroe, United States

Last updated: June 24, 2025

In Monroe, United States, the average temperature in September hovers around a pleasant 20°C (67°F). Expect minimums as low as 4°C (40°F) and maximums that can soar to 34°C (94°F). Be prepared for some rain with an average precipitation of 57 mm (2.3 in) spread over 9 days, contributing to the generally high humidity of 78%.

September Temperature in Monroe

In September in Monroe, the average temperature is 20°C (67°F), with maximums reaching 34°C (94°F) and minimums dipping as low as 4°C (40°F). Be sure to pack a range of clothing to suit both warm days and cooler nights during your travels.

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

The chart illustrates September temperature patterns in Monroe, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monroe, September typically has an average temperature of 20°C (67°F), with highs reaching up to 34°C (94°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec282938486071767367554034
Data source: Temperature data for Monroe 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 Monroe

In Monroe in September, the precipitation amount is 57 mm (2.3 in) over the course of 9 days.

September Precipitation Trends in Monroe

The chart displays monthly precipitation patterns in Monroe, 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 Monroe, September typically receives around 57 mm (2.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec66687787123861037857988357
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Monroe

In Monroe in September humidity is 78%. With an average temperature of 20°C (67°F), this humidity feels like walking through a warm, thick blanket, making travel a bit sticky and requiring frequent breaks to find shade and cool refreshments.

September Average Humidity in Monroe

This chart illustrates the average monthly humidity levels in Monroe, 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 Monroe 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 Monroe

In Monroe 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 Monroe.

Maximum UV Index Levels in Monroe for September

The chart shows the monthly maximum UV Index (UVI) for Monroe 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 Monroe typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25599101098642
Data source: Monroe 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 Monroe Compares to Other Months

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

This table compares monthly weather conditions in Monroe, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)65 mm (2.6 inches)88%low
February Weather-2°C (29°F)68 mm (2.7 inches)87%moderate
March Weather3°C (38°F)77 mm (3.0 inches)87%moderate
April Weather9°C (48°F)87 mm (3.4 inches)87%very high
May Weather16°C (60°F)123 mm (4.8 inches)81%very high
June Weather22°C (71°F)86 mm (3.4 inches)82%very high
July Weather24°C (76°F)103 mm (4.1 inches)81%very high
August Weather23°C (74°F)78 mm (3.1 inches)78%very high
September Weather20°C (67°F)57 mm (2.3 inches)78%very high
October Weather13°C (56°F)98 mm (3.9 inches)82%high
November Weather5°C (41°F)83 mm (3.3 inches)89%moderate
December Weather1°C (34°F)57 mm (2.2 inches)86%low

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