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September Weather in Sycamore, United States

Last updated: June 24, 2025

In September, the average temperature in Sycamore, United States is a warm 26°C (80°F). Expect a chilly low of 13°C (56°F) and occasional highs reaching up to 38°C (101°F). During this month, the region experiences 114 mm (4.5 in) of precipitation over approximately 9 days, accompanied by an average humidity of 83%. It's a month that beautifully blends warmth with the refreshing touch of rain!

September Temperature in Sycamore

In September in Sycamore, the average temperature is 26°C (80°F). Maximums can reach 38°C (101°F), and minimums can be as low as 13°C (56°F). Visitors should be prepared for warm weather, with the possibility of cooler evenings, making it an ideal time for both outdoor adventures and leisurely explorations.

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

The chart illustrates September temperature patterns in Sycamore, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sycamore, September typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (101°F) and lows dropping to around 13°C (56°F).
JanFebMarAprMayJunJulAugSepOctNovDec525762677580838280725854
Data source: Temperature data for Sycamore 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 Sycamore

In Sycamore in September, the precipitation amount is 114 mm (4.5 in) over the course of 9 days.

September Precipitation Trends in Sycamore

The chart displays monthly precipitation patterns in Sycamore, 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 Sycamore, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec791158610481951141081159056119
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sycamore

In Sycamore in September humidity is 83%. With an average temperature of 26°C (80°F), this humidity feels like a warm, enveloping blanket that can make traveling quite uncomfortable; you may find yourself needing frequent breaks for hydration and cool shade as the thick air clings to your skin.

September Average Humidity in Sycamore

This chart illustrates the average monthly humidity levels in Sycamore, 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 Sycamore is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%82%80%76%73%74%80%79%83%77%84%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sycamore

In Sycamore in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Sycamore.

Maximum UV Index Levels in Sycamore for September

The chart shows the monthly maximum UV Index (UVI) for Sycamore 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 Sycamore typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589101111111110864
Data source: Sycamore 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 Sycamore Compares to Other Months

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

This table compares monthly weather conditions in Sycamore, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)79 mm (3.1 inches)85%moderate
February Weather14°C (58°F)115 mm (4.5 inches)82%very high
March Weather17°C (62°F)86 mm (3.4 inches)80%very high
April Weather19°C (67°F)104 mm (4.1 inches)76%very high
May Weather24°C (76°F)81 mm (3.2 inches)73%extreme
June Weather27°C (81°F)95 mm (3.8 inches)74%extreme
July Weather28°C (83°F)114 mm (4.5 inches)80%extreme
August Weather28°C (83°F)108 mm (4.2 inches)79%extreme
September Weather26°C (80°F)114 mm (4.5 inches)83%very high
October Weather22°C (72°F)90 mm (3.5 inches)77%very high
November Weather15°C (58°F)56 mm (2.2 inches)84%high
December Weather12°C (54°F)119 mm (4.7 inches)88%moderate

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