nomadseason

September Weather in Effingham, United States

Last updated: June 24, 2025

In September, the average temperature in Effingham, United States hovers around 17°C (63°F). Expect a range where the minimum can dip to 1°C (34°F) and the maximum can soar to 31°C (89°F). Throughout the month, precipitation amounts to about 65 mm (2.6 in) over 8 days, resulting in an average humidity of 71%.

September Temperature in Effingham

In September in Effingham, the average temperature is 17°C (63°F). The maximum can reach 31°C (89°F), while the minimum can drop as low as 1°C (34°F). Be prepared for a range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Effingham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Effingham, September typically has an average temperature of 17°C (63°F), with highs reaching up to 31°C (89°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec222532445566717063513727
Data source: Temperature data for Effingham generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Effingham

In Effingham in September, the total precipitation amount is 65 mm (2.6 in) spread over the course of 8 days.

September Precipitation Trends in Effingham

The chart displays monthly precipitation patterns in Effingham, 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 Effingham, September typically receives around 65 mm (2.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec81907813178951488665127113121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Effingham

In Effingham in September, humidity is 71%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making outdoor activities enjoyable yet a bit sticky, so travelers should stay hydrated and take breaks in the shade.

September Average Humidity in Effingham

This chart illustrates the average monthly humidity levels in Effingham, 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 Effingham is approximately 71%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%82%80%72%72%67%66%71%79%84%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Effingham

In Effingham 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 Effingham.

Maximum UV Index Levels in Effingham for September

The chart shows the monthly maximum UV Index (UVI) for Effingham 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 Effingham typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3458910997532
Data source: Effingham 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 Effingham Compares to Other Months

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

This table compares monthly weather conditions in Effingham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)81 mm (3.2 inches)86%moderate
February Weather-4°C (25°F)90 mm (3.6 inches)84%moderate
March Weather0°C (32°F)78 mm (3.1 inches)82%moderate
April Weather6°C (44°F)131 mm (5.2 inches)80%very high
May Weather13°C (56°F)78 mm (3.1 inches)72%very high
June Weather19°C (66°F)95 mm (3.7 inches)72%very high
July Weather22°C (71°F)148 mm (5.8 inches)67%very high
August Weather21°C (70°F)86 mm (3.4 inches)66%very high
September Weather17°C (63°F)65 mm (2.6 inches)71%high
October Weather11°C (51°F)127 mm (5.0 inches)78%moderate
November Weather3°C (37°F)113 mm (4.4 inches)84%moderate
December Weather-3°C (27°F)120 mm (4.7 inches)81%low

Compare Effingham's Climate with Cities Worldwide