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September Weather in Sparta, United States

Last updated: June 24, 2025

In Sparta, United States, the average temperature for September sits at a pleasant 18°C (65°F). However, be prepared for a range, as temperatures can drop to a chilly 2°C (35°F) or soar to a brisk 35°C (94°F). This month also sees an average of 114 mm (4.5 in) of precipitation spread over 10 days, contributing to a 79% average humidity that creates a lush environment.

September Temperature in Sparta

In September in Sparta, the average temperature is 18°C (65°F). Maximums can reach 35°C (94°F), and minimums can drop to as low as 2°C (35°F). This varied climate makes it a great time to explore, so be sure to pack layers to enjoy all that Sparta has to offer!

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

The chart illustrates September temperature patterns in Sparta, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sparta, September typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (94°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec252636465969747265523831
Data source: Temperature data for Sparta 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 Sparta

In Sparta in September, the precipitation amount is 114 mm (4.5 in) over a period of 10 days.

September Precipitation Trends in Sparta

The chart displays monthly precipitation patterns in Sparta, 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 Sparta, September typically receives around 114 mm (4.5 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec6265649413212163801141296268
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sparta

In Sparta in September, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

September Average Humidity in Sparta

This chart illustrates the average monthly humidity levels in Sparta, 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 Sparta is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%87%82%81%78%79%80%82%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sparta

In Sparta 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 Sparta.

Maximum UV Index Levels in Sparta for September

The chart shows the monthly maximum UV Index (UVI) for Sparta 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 Sparta typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Sparta 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 Sparta Compares to Other Months

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

This table compares monthly weather conditions in Sparta, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)62 mm (2.4 inches)87%low
February Weather-3°C (27°F)65 mm (2.6 inches)87%moderate
March Weather2°C (36°F)64 mm (2.5 inches)86%moderate
April Weather8°C (46°F)94 mm (3.7 inches)87%very high
May Weather15°C (59°F)132 mm (5.2 inches)82%very high
June Weather21°C (69°F)121 mm (4.8 inches)81%very high
July Weather23°C (75°F)63 mm (2.5 inches)78%very high
August Weather22°C (72°F)80 mm (3.2 inches)79%very high
September Weather18°C (65°F)114 mm (4.5 inches)79%high
October Weather11°C (53°F)129 mm (5.1 inches)82%moderate
November Weather3°C (38°F)62 mm (2.5 inches)87%moderate
December Weather0°C (32°F)68 mm (2.7 inches)86%low

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