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September Weather in Sparta, United States

Last updated: June 24, 2025

In Sparta, United States, the average temperature in September is a pleasant 20°C (68°F). However, don't be surprised by a minimum drop to 4°C (39°F) or a peak of 32°C (90°F). Expect 132 mm (5.2 in) of precipitation spread across 11 days, contributing to an average humidity of 68%. Embrace the variability of this month!

September Temperature in Sparta

In September in Sparta, the average temperature is 20°C (68°F). Maximum temperatures can reach 32°C (90°F), and minimums can drop as low as 4°C (39°F). This makes it a great time to explore outdoor activities while packing layers to stay comfortable.

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 20°C (68°F), with highs reaching up to 32°C (90°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec374247556470747268594541
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 132 mm (5.2 in), which occurs over a span of 11 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 132 mm (5.2 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec83114881421371068812413213776104
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 68%. With an average temperature of 20°C (68°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls while also prompting travelers to stay hydrated and seek out refreshing breaks from the heat.

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 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%86%84%83%83%79%66%68%78%89%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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101111111010853
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 Weather3°C (37°F)83 mm (3.3 inches)87%moderate
February Weather6°C (43°F)114 mm (4.5 inches)87%high
March Weather8°C (47°F)88 mm (3.5 inches)86%very high
April Weather13°C (55°F)142 mm (5.6 inches)84%very high
May Weather18°C (64°F)137 mm (5.4 inches)83%extreme
June Weather21°C (70°F)106 mm (4.2 inches)83%extreme
July Weather23°C (74°F)88 mm (3.5 inches)79%extreme
August Weather22°C (73°F)124 mm (4.9 inches)66%very high
September Weather20°C (68°F)132 mm (5.2 inches)68%very high
October Weather15°C (59°F)137 mm (5.4 inches)78%very high
November Weather7°C (45°F)76 mm (3.0 inches)89%moderate
December Weather5°C (41°F)104 mm (4.1 inches)86%moderate

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