September Weather in Irrigon, United States

Last updated: June 24, 2025

In Irrigon, United States, the average temperature in September hovers around 21°C (69°F). Expect a minimum of 6°C (42°F) and a maximum reaching up to 39°C (103°F). Precipitation is modest, with an average of 8 mm (0.3 in) spread over just 2 days. The average humidity stands at a comfortable 58%, making for a pleasant climate this time of year.

September Temperature in Irrigon

In September in Irrigon, the average temperature is 21°C (69°F). Maximums can reach 39°C (103°F), while minimums can dip as low as 6°C (42°F). Prepare for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in Irrigon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Irrigon, September typically has an average temperature of 21°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 Irrigon generated using information from the Copernicus Climate Change Service.

September Precipitation in Irrigon

In Irrigon in September, the precipitation amount is 8 mm (0.3 in) over the course of 2 days.

September Precipitation Trends in Irrigon

The chart displays monthly precipitation patterns in Irrigon, 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 Irrigon, September typically receives around 8 mm (0.3 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 Irrigon

In Irrigon in September humidity is 58%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace, creating a comfortable atmosphere for traveling that encourages leisurely exploration without feeling overly sticky or oppressive.

September Average Humidity in Irrigon

This chart illustrates the average monthly humidity levels in Irrigon, 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 Irrigon is approximately 58%, 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 Irrigon

In Irrigon 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 Irrigon.

Maximum UV Index Levels in Irrigon for September

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

Data source: Irrigon 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 Irrigon Compares to Other Months

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

This table compares monthly weather conditions in Irrigon, 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 (37°F)	33 mm (1.3 inches)	86%	low
February Weather	3°C (38°F)	39 mm (1.5 inches)	86%	moderate
March Weather	8°C (47°F)	24 mm (0.9 inches)	85%	moderate
April Weather	13°C (56°F)	19 mm (0.7 inches)	83%	high
May Weather	19°C (66°F)	13 mm (0.5 inches)	77%	very high
June Weather	23°C (74°F)	7 mm (0.3 inches)	81%	very high
July Weather	27°C (81°F)	0 mm (0.0 inches)	76%	very high
August Weather	27°C (80°F)	2 mm (0.1 inches)	60%	very high
September Weather	21°C (69°F)	8 mm (0.3 inches)	58%	high
October Weather	13°C (55°F)	22 mm (0.9 inches)	75%	moderate
November Weather	6°C (44°F)	29 mm (1.1 inches)	85%	moderate
December Weather	3°C (37°F)	30 mm (1.2 inches)	87%	low