September Weather in Longview, United States

Last updated: June 24, 2025

In Longview, United States, the average temperature in September is a warm 26°C (79°F). Temperatures can vary significantly, with a minimum of 10°C (51°F) and a maximum soaring to 39°C (102°F). Visitors should also be prepared for some rain, as 96 mm (3.8 in) of precipitation may fall over 9 days, accompanied by an average humidity level of 63%.

September Temperature in Longview

In September in Longview, the average temperature is 26°C (79°F). The maximum can reach 39°C (102°F), while the minimum can drop to as low as 10°C (51°F). Travelers should be prepared for a wide range of temperatures, making it essential to pack both light clothing for warmth and layers for cooler evenings.

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

The chart illustrates September temperature patterns in Longview, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longview, September typically has an average temperature of 26°C (79°F), with highs reaching up to 39°C (102°F) and lows dropping to around 10°C (51°F).

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

September Precipitation in Longview

In Longview in September, the total precipitation amount is 96 mm (3.8 in) spread over a period of 9 days.

September Precipitation Trends in Longview

The chart displays monthly precipitation patterns in Longview, 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 Longview, September typically receives around 96 mm (3.8 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 Longview

In Longview in September humidity is 63%. With average temperature 26°C (79°F), this humidity feels like a warm embrace, making it perfect for leisurely strolls or exploring local attractions, though be prepared for a slight stickiness that may prompt you to seek shade or refreshing beverages along the way.

September Average Humidity in Longview

This chart illustrates the average monthly humidity levels in Longview, 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 Longview is approximately 63%, 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 Longview

In Longview 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 Longview.

Maximum UV Index Levels in Longview for September

The chart shows the monthly maximum UV Index (UVI) for Longview 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 Longview typically reaches 10, which falls under the very high exposure category.

Data source: Longview 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 Longview Compares to Other Months

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

This table compares monthly weather conditions in Longview, 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 (48°F)	105 mm (4.1 inches)	82%	moderate
February Weather	10°C (51°F)	150 mm (5.9 inches)	80%	high
March Weather	16°C (61°F)	128 mm (5.1 inches)	78%	very high
April Weather	18°C (65°F)	159 mm (6.2 inches)	79%	very high
May Weather	23°C (74°F)	154 mm (6.1 inches)	81%	extreme
June Weather	27°C (81°F)	112 mm (4.4 inches)	77%	extreme
July Weather	29°C (84°F)	84 mm (3.3 inches)	72%	extreme
August Weather	29°C (84°F)	75 mm (3.0 inches)	65%	extreme
September Weather	26°C (79°F)	96 mm (3.8 inches)	63%	very high
October Weather	20°C (69°F)	96 mm (3.8 inches)	70%	very high
November Weather	14°C (57°F)	58 mm (2.3 inches)	82%	high
December Weather	11°C (53°F)	120 mm (4.7 inches)	88%	moderate