September Weather in Grayson, United States

Last updated: June 24, 2025

In September, the average temperature in Grayson, United States hovers around 23°C (74°F). Expect a minimum of 10°C (50°F) and a maximum of 35°C (96°F). During this time, you'll experience about 115 mm (4.5 in) of precipitation spread over 9 days, with an average humidity level of 82%. Be prepared for a mix of warmth and moisture!

September Temperature in Grayson

In September in Grayson, the average temperature is 23°C (74°F). Maximum temperatures can reach up to 35°C (96°F), while minimum temperatures can drop as low as 10°C (50°F). This makes Grayson a pleasant destination for travelers seeking warm days and cool nights.

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 23°C (74°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (50°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 115 mm (4.5 in) over the course of 9 days, indicating a relatively wet period for the region.

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 115 mm (4.5 inches) of precipitation spread over approximately 9 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 82%. With an average temperature of 23°C (74°F), this humidity feels like you are walking through a warm, damp blanket, making travel a bit uncomfortable and sticky as you navigate the air thick with moisture.

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 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 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	7°C (45°F)	109 mm (4.3 inches)	86%	moderate
February Weather	10°C (51°F)	155 mm (6.1 inches)	84%	high
March Weather	13°C (56°F)	138 mm (5.4 inches)	83%	very high
April Weather	16°C (62°F)	123 mm (4.8 inches)	81%	extreme
May Weather	21°C (71°F)	120 mm (4.7 inches)	81%	extreme
June Weather	24°C (76°F)	135 mm (5.3 inches)	81%	extreme
July Weather	26°C (79°F)	119 mm (4.7 inches)	83%	extreme
August Weather	26°C (78°F)	153 mm (6.0 inches)	81%	very high
September Weather	23°C (74°F)	115 mm (4.5 inches)	82%	very high
October Weather	18°C (65°F)	143 mm (5.6 inches)	78%	very high
November Weather	11°C (52°F)	80 mm (3.2 inches)	86%	high
December Weather	9°C (48°F)	138 mm (5.4 inches)	89%	moderate