September Weather in Thomson, United States

Last updated: June 24, 2025

In Thomson, United States, the average temperature in September reaches a pleasant 25°C (78°F). However, you can experience a range as lows dip to 11°C (53°F) and highs soar to 37°C (99°F). Expect about 88 mm (3.5 in) of precipitation spread over 8 days, with a cozy average humidity of 82%. Whether you’re soaking up the sun or bracing for a brief shower, this month offers a delightful blend of climate conditions!

September Temperature in Thomson

In September in Thomson, the average temperature is 25°C (78°F). Maximums can reach 37°C (99°F), while minimums can be as low as 11°C (53°F). This range makes it a great time for travelers who enjoy warm weather, with opportunities to explore both outdoor activities and cozy indoor experiences.

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

The chart illustrates September temperature patterns in Thomson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Thomson, September typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 11°C (53°F).

Data source: Temperature data for Thomson generated using information from the Copernicus Climate Change Service.

September Precipitation in Thomson

In Thomson in September, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.

September Precipitation Trends in Thomson

The chart displays monthly precipitation patterns in Thomson, 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 Thomson, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Thomson

In Thomson in September, humidity is 82%. With an average temperature of 25°C (78°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities a bit more challenging and encouraging you to seek shade or a cool spot during your travels.

September Average Humidity in Thomson

This chart illustrates the average monthly humidity levels in Thomson, 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 Thomson is approximately 82%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Thomson

In Thomson in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Thomson.

Maximum UV Index Levels in Thomson for September

The chart shows the monthly maximum UV Index (UVI) for Thomson 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 Thomson typically reaches 9, which falls under the very high exposure category.

Data source: Thomson 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 Thomson Compares to Other Months

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

This table compares monthly weather conditions in Thomson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (49°F)	94 mm (3.7 inches)	86%	moderate
February Weather	12°C (54°F)	117 mm (4.6 inches)	84%	high
March Weather	15°C (59°F)	82 mm (3.2 inches)	83%	very high
April Weather	18°C (65°F)	105 mm (4.1 inches)	81%	very high
May Weather	23°C (74°F)	104 mm (4.1 inches)	81%	extreme
June Weather	26°C (79°F)	105 mm (4.1 inches)	81%	extreme
July Weather	28°C (82°F)	110 mm (4.3 inches)	83%	extreme
August Weather	27°C (81°F)	135 mm (5.3 inches)	81%	very high
September Weather	25°C (78°F)	88 mm (3.5 inches)	82%	very high
October Weather	20°C (69°F)	106 mm (4.2 inches)	78%	very high
November Weather	13°C (55°F)	75 mm (3.0 inches)	86%	high
December Weather	10°C (51°F)	118 mm (4.7 inches)	89%	moderate