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September Weather in South Thomaston, United States

Last updated: June 24, 2025

In September, the average temperature in South Thomaston, United States hovers around 17°C (62°F). Expect minimums of 6°C (43°F) and occasional highs reaching 29°C (84°F). With an average humidity of 80%, the weather can feel quite humid. Be prepared for 85 mm (3.3 in) of precipitation over about 7 days, making it a month where both sunshine and showers are likely!

September Temperature in South Thomaston

In September in South Thomaston, the average temperature is 17°C (62°F). Maximums can reach 29°C (84°F), and minimums can be as low as 6°C (43°F). This makes it a great time for travelers to enjoy a mix of warm days and cooler evenings.

September Weather in South Thomaston: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in South Thomaston, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In South Thomaston, September typically has an average temperature of 17°C (62°F), with highs reaching up to 29°C (84°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec282934435262676862534132
Data source: Temperature data for South Thomaston 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 South Thomaston

In South Thomaston in September, the total precipitation amount is 85 mm (3.3 in) over the course of 7 days.

September Precipitation Trends in South Thomaston

The chart displays monthly precipitation patterns in South Thomaston, 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 South Thomaston, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec94967813383721018085133116127
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in South Thomaston

In South Thomaston in September, humidity is 80%. With an average temperature of 17°C (62°F), this humidity feels like a heavy blanket wrapping around you, making travel sticky and uncomfortable, and often leaving you longing for a refreshing breeze.

September Average Humidity in South Thomaston

This chart illustrates the average monthly humidity levels in South Thomaston, 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 South Thomaston is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%86%84%79%79%86%85%83%80%77%80%81%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in South Thomaston

In South Thomaston 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 South Thomaston.

Maximum UV Index Levels in South Thomaston for September

The chart shows the monthly maximum UV Index (UVI) for South Thomaston 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 South Thomaston typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910987532
Data source: South Thomaston 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 South Thomaston Compares to Other Months

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

This table compares monthly weather conditions in South Thomaston, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)94 mm (3.7 inches)85%low
February Weather-2°C (29°F)96 mm (3.8 inches)86%moderate
March Weather1°C (34°F)78 mm (3.1 inches)84%moderate
April Weather6°C (44°F)133 mm (5.2 inches)79%high
May Weather11°C (53°F)83 mm (3.3 inches)79%very high
June Weather17°C (62°F)72 mm (2.8 inches)86%very high
July Weather20°C (68°F)101 mm (4.0 inches)85%very high
August Weather20°C (68°F)80 mm (3.1 inches)83%very high
September Weather17°C (62°F)85 mm (3.3 inches)80%high
October Weather12°C (53°F)133 mm (5.2 inches)77%moderate
November Weather5°C (41°F)116 mm (4.6 inches)80%moderate
December Weather0°C (32°F)127 mm (5.0 inches)81%low

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