September Weather in Pasco, United States

Last updated: June 24, 2025

In Pasco, United States, the average temperature for September hovers around 20°C (69°F). This month can bring a range of temperatures, with a minimum of 6°C (42°F) and a maximum reaching up to 39°C (103°F). You can expect 12 mm (0.5 in) of precipitation over the course of 2 days, with an average humidity level of about 60%. Enjoy the varied weather as you explore the beauty of Pasco!

September Temperature in Pasco

In September in Pasco, the average temperature is 20°C (69°F). Maximums can reach 39°C (103°F), and minimums can be as low as 6°C (42°F). Travelers should prepare for a wide range of temperatures, from warm days to cool nights.

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

The chart illustrates September temperature patterns in Pasco, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Pasco, September typically has an average temperature of 20°C (69°F), with highs reaching up to 39°C (103°F) and lows dropping to around 6°C (42°F).

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

September Precipitation in Pasco

In Pasco in September, the precipitation amount is 12 mm (0.5 in) over the course of 2 days.

September Precipitation Trends in Pasco

The chart displays monthly precipitation patterns in Pasco, 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 Pasco, September typically receives around 12 mm (0.5 inches) of precipitation spread over approximately 2 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 Pasco

In Pasco in September humidity is 60%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making it quite pleasant for traveling, as the air is soft and invigorating, perfect for exploring the sights and enjoying the local culture without feeling overwhelmed.

September Average Humidity in Pasco

This chart illustrates the average monthly humidity levels in Pasco, 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 Pasco is approximately 60%, 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 Pasco

In Pasco 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 Pasco.

Maximum UV Index Levels in Pasco for September

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

Data source: Pasco 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 Pasco Compares to Other Months

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

This table compares monthly weather conditions in Pasco, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	2°C (36°F)	39 mm (1.5 inches)	85%	low
February Weather	3°C (37°F)	45 mm (1.8 inches)	86%	moderate
March Weather	8°C (46°F)	32 mm (1.3 inches)	86%	moderate
April Weather	13°C (55°F)	26 mm (1.0 inches)	82%	high
May Weather	19°C (66°F)	15 mm (0.6 inches)	77%	very high
June Weather	23°C (74°F)	10 mm (0.4 inches)	79%	very high
July Weather	27°C (82°F)	0 mm (0.0 inches)	77%	very high
August Weather	27°C (80°F)	3 mm (0.1 inches)	62%	very high
September Weather	20°C (69°F)	12 mm (0.5 inches)	60%	high
October Weather	12°C (54°F)	27 mm (1.1 inches)	80%	moderate
November Weather	6°C (43°F)	37 mm (1.5 inches)	87%	moderate
December Weather	2°C (36°F)	35 mm (1.4 inches)	86%	low