September weather forecast
Irrigon, OR

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Weather in September

September, the first month of the autumn in Irrigon, is also a moderately hot month, with an average temperature fluctuating between 57.4°F (14.1°C) and 77.2°F (25.1°C).

Temperature

As August transitions to September, the average high-temperature falls from a tropical 87.8°F (31°C) to a moderately hot 77.2°F (25.1°C). Throughout September, an average low-temperature of 57.4°F (14.1°C) is expected.

Humidity

In September, the average relative humidity in Irrigon is 44%.

Rainfall

In Irrigon, in September, during 5.6 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. Throughout the year, in Irrigon, there are 106.1 rainfall days, and 7.76" (197mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Irrigon are January through March, September, November and December. September is the first month it typically snows in Irrigon. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 10.3 snowfall days, and 6.02" (153mm) of snow is accumulated.

Daylight

In Irrigon, Oregon, the average length of the day in September is 12h and 31min.
On the first day of September in Irrigon, Oregon, sunrise is at 6:19 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:39 pm PDT.

Sunshine

In Irrigon, Oregon, the average sunshine in September is 10.7h.

UV index

In Irrigon, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 4 during September translates into these guidelines:
Take measures. Individuals with light skin might experience burns in under 30 minutes. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

What is the temperature in September in Irrigon?

The average high-temperature, in September, in Irrigon, is 77.2°F (25.1°C), while the average low-temperature is 57.4°F (14.1°C).

What is the average humidity in September in Irrigon?

In Irrigon, the average relative humidity in September is 44%.

How many days does it rain in September in Irrigon?

In September, in Irrigon, the rain falls for 5.6 days. Throughout September, 0.31" (8mm) of precipitation is accumulated.

When does it start to snow in Irrigon?

September is the first month it typically snows in Irrigon, Oregon. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow.

How many hours of daylight does Irrigon have in September?

The average day length in September in Irrigon, Oregon, is 12h and 31min.

When is the sunrise / sunset in September in Irrigon?

In September, on the first day of the month, sunrise is at 6:19 am and sunset at 7:35 pm. On the last day of the month, in Irrigon, sunrise is at 6:56 am and sunset at 6:39 pm PDT.

How many hours of sunshine does Irrigon have in September?

In September, the average sunshine duration in Irrigon is 10.7h.

What is the UV index reading in September in Irrigon?

In Irrigon, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Irrigon, OR

Average temperature in September - Irrigon, OR
  • Average high temperature in September: 77.2°F

The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (38.7°F).

  • Average low temperature in September: 57.4°F

The month with the highest average low temperature is August (64.2°F).
The coldest month (with the lowest average low temperature) is December (28.6°F).

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Average pressure in September
Irrigon, OR

Average pressure in September - Irrigon, OR
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed in September
Irrigon, OR

Average wind speed in September - Irrigon, OR
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is April (9.3mph).
The calmest month (with the lowest average wind speed) is December (6.2mph).

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Average humidity in September
Irrigon, OR

Average humidity in September - Irrigon, OR
  • Average humidity in September: 44%

The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (36%).

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Average rainfall in September
Irrigon, OR

Average rainfall in September - Irrigon, OR
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is March (1.02").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Irrigon, OR

Average rainfall days in September - Irrigon, OR
  • Average rainfall days in September: 5.6 days

The month with the highest number of rainy days is March (13.1 days).
The month with the least rainy days is July (3.8 days).

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Average snowfall in September
Irrigon, OR

Average snowfall in September - Irrigon, OR
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (2.83").
The months with the least snowfall are April, May, June, July, August and October (0").

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Average snowfall days in September
Irrigon, OR

Average snowfall days in September - Irrigon, OR
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is December (3.2 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).

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Average daylight in September /
Average sunshine in September
Irrigon, OR

Average daylight in September / Average sunshine in September - Irrigon, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Irrigon, OR

Average sunshine days in September - Irrigon, OR
  • Average sunshine days in September: 22.6 days

The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is February (14 days).

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Average UV index in September
Irrigon, OR

Average UV index in September - Irrigon, OR
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Irrigon, OR

Average cloud cover in September - Irrigon, OR
  • Average cloud cover in September: 16

The months with the most cloud cover are January and December (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in September
Irrigon, OR

Average visibility in September - Irrigon, OR
  • Average visibility in September: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Irrigon, Oregon, USA

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