September Weather in Grayson, United States

Last updated: June 24, 2025

In September, the average temperature in Grayson, United States is a pleasant 24°C (75°F). Temperatures can vary significantly, with a minimum of 9°C (48°F) and soaring up to a maximum of 42°C (109°F). Despite these extremes, you can expect little rain, with just 1 mm (0.1 in) of precipitation over 0 days. The average humidity hovers around a comfortable 55%, making it an inviting time to explore!

September Temperature in Grayson

In September in Grayson, the average temperature is 24°C (75°F). Maximums can reach 42°C (109°F), and minimums can be as low as 9°C (48°F). Be prepared for a wide range of temperatures if you're planning to travel during this time.

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

The chart illustrates September temperature patterns in Grayson, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Grayson, September typically has an average temperature of 24°C (75°F), with highs reaching up to 42°C (109°F) and lows dropping to around 9°C (48°F).

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

September Precipitation in Grayson

In Grayson in September, the precipitation amount is 1 mm (0.1 in) during 0 days, indicating a very dry period.

September Precipitation Trends in Grayson

The chart displays monthly precipitation patterns in Grayson, 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 Grayson, September typically receives around 1 mm (0.1 inches) of precipitation spread over approximately 0 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 Grayson

In Grayson in September humidity is 55%. With an average temperature of 24°C (75°F), this humidity feels like a warm embrace, making traveling both comfortable and energizing as you explore the vibrant surroundings.

September Average Humidity in Grayson

This chart illustrates the average monthly humidity levels in Grayson, 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 Grayson is approximately 55%, 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 Grayson

In Grayson 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 Grayson.

Maximum UV Index Levels in Grayson for September

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

Data source: Grayson 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 Grayson Compares to Other Months

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

This table compares monthly weather conditions in Grayson, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	93 mm (3.7 inches)	82%	moderate
February Weather	11°C (52°F)	72 mm (2.8 inches)	84%	moderate
March Weather	13°C (55°F)	80 mm (3.1 inches)	82%	very high
April Weather	16°C (61°F)	31 mm (1.2 inches)	78%	very high
May Weather	20°C (68°F)	18 mm (0.7 inches)	71%	very high
June Weather	25°C (76°F)	2 mm (0.1 inches)	64%	extreme
July Weather	27°C (81°F)	0 mm (0.0 inches)	58%	extreme
August Weather	26°C (80°F)	0 mm (0.0 inches)	54%	very high
September Weather	24°C (75°F)	1 mm (0.1 inches)	55%	very high
October Weather	19°C (66°F)	16 mm (0.6 inches)	62%	high
November Weather	13°C (56°F)	29 mm (1.1 inches)	78%	moderate
December Weather	10°C (50°F)	78 mm (3.1 inches)	80%	moderate