September Weather in Toppenish, United States

Last updated: June 24, 2025

In Toppenish, United States, the average temperature in September hovers around 19°C (66°F). Temperatures can range from a chilly 4°C (39°F) to a scorching 38°C (101°F). Expect precipitation of about 11 mm (0.4 in) spread over 3 days, with an average humidity level of 62%.

September Temperature in Toppenish

In September in Toppenish, the average temperature is 19°C (66°F). Maximums can reach 38°C (101°F) and minimums can be as low as 4°C (39°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cooler temperatures.

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

The chart illustrates September temperature patterns in Toppenish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Toppenish, September typically has an average temperature of 19°C (66°F), with highs reaching up to 38°C (101°F) and lows dropping to around 4°C (39°F).

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

September Precipitation in Toppenish

In Toppenish in September, the precipitation amount is 11 mm (0.4 in) over the course of 3 days.

September Precipitation Trends in Toppenish

The chart displays monthly precipitation patterns in Toppenish, 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 Toppenish, September typically receives around 11 mm (0.4 inches) of precipitation spread over approximately 3 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 Toppenish

In Toppenish in September, humidity is 62%. With an average temperature of 19°C (66°F), this humidity feels like a balmy embrace, making travel pleasant, yet slightly muggy, urging you to stay hydrated and seek shade during midday excursions.

September Average Humidity in Toppenish

This chart illustrates the average monthly humidity levels in Toppenish, 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 Toppenish is approximately 62%, 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 Toppenish

In Toppenish 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 Toppenish.

Maximum UV Index Levels in Toppenish for September

The chart shows the monthly maximum UV Index (UVI) for Toppenish 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 Toppenish typically reaches 7, which falls under the high exposure category.

Data source: Toppenish 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 Toppenish Compares to Other Months

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

This table compares monthly weather conditions in Toppenish, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	0°C (32°F)	49 mm (1.9 inches)	86%	low
February Weather	1°C (34°F)	47 mm (1.8 inches)	86%	moderate
March Weather	6°C (43°F)	26 mm (1.0 inches)	87%	moderate
April Weather	11°C (52°F)	22 mm (0.9 inches)	84%	high
May Weather	17°C (63°F)	14 mm (0.6 inches)	81%	very high
June Weather	21°C (71°F)	6 mm (0.2 inches)	82%	very high
July Weather	25°C (78°F)	1 mm (0.0 inches)	79%	very high
August Weather	25°C (77°F)	4 mm (0.2 inches)	63%	very high
September Weather	19°C (66°F)	11 mm (0.4 inches)	62%	high
October Weather	11°C (51°F)	31 mm (1.2 inches)	83%	moderate
November Weather	4°C (40°F)	33 mm (1.3 inches)	89%	moderate
December Weather	1°C (33°F)	43 mm (1.7 inches)	88%	low