September weather forecast
Grants Pass, OR

Colorful balloons rise from the scenic grounds in a field near Grant Pass, Oregon
Colorful balloons rise from the scenic grounds in a field near Grant Pass, Oregon

Weather in September

The first month of the autumn, September, is also a moderately hot month in Grants Pass, Oregon, with an average temperature varying between 45°F (7.2°C) and 77.4°F (25.2°C).

Temperature

In Grants Pass, the average high-temperature in September marginally drops from a warm 84.7°F (29.3°C) in August to a still moderately hot 77.4°F (25.2°C). In Grants Pass, in September, the average low-temperature is 45°F (7.2°C).

Humidity

In Grants Pass, the average relative humidity in September is 67%.

Rainfall

In September, in Grants Pass, the rain falls for 5.3 days. Throughout September, 0.59" (15mm) of precipitation is accumulated. In Grants Pass, during the entire year, the rain falls for 135.3 days and collects up to 23.54" (598mm) of precipitation.

Snowfall

May through October are months without snowfall.

Daylight

The average length of the day in September in Grants Pass is 12h and 28min.
On the first day of September in Grants Pass, sunrise is at 6:38 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

Sunshine

The average sunshine in September in Grants Pass is 10.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the temperature in September in Grants Pass?

The average high-temperature, in September, is 77.4°F (25.2°C), while the average low-temperature is 45°F (7.2°C). in August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, is appraised at 89.6°F (32°C).

What is the average humidity in September in Grants Pass?

In September, the average relative humidity is 67%.

How much does it rain in Grants Pass in September?

In Grants Pass, in September, it is raining for 5.3 days, with typically 0.59" (15mm) of accumulated precipitation.

When it does not snow in Grants Pass?

In Grants Pass, Oregon, snow does not fall in May through October.

How many hours of daylight does Grants Pass have in September?

In September, the average day length in Grants Pass is 12h and 28min.

When is the sunrise / sunset in September in Grants Pass?

On the first day of September in Grants Pass, sunrise is at 6:38 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:57 pm PDT.

How many hours of sunshine does Grants Pass have in September?

The average sunshine duration in September is 10.4h.

How high is the UV index in September in Grants Pass?

In Grants Pass, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Grants Pass, OR

Average temperature in September - Grants Pass, OR
  • Average high temperature in September: 77.4°F

The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (46°F).

  • Average low temperature in September: 45°F

The month with the highest average low temperature is August (49.1°F).
The coldest month (with the lowest average low temperature) is December (31.5°F).

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Average pressure in September
Grants Pass, OR

Average pressure in September - Grants Pass, OR
  • Average pressure in September: 30"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is August (29.99"Hg).

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Average wind speed in September
Grants Pass, OR

Average wind speed in September - Grants Pass, OR
  • Average wind speed in September: 3.3mph

The windiest month (with the highest average wind speed) is March (4mph).
The calmest month (with the lowest average wind speed) is August (3.2mph).

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Average humidity in September
Grants Pass, OR

Average humidity in September - Grants Pass, OR
  • Average humidity in September: 67%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (63%).

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Average rainfall in September
Grants Pass, OR

Average rainfall in September - Grants Pass, OR
  • Average rainfall in September: 0.59"

The wettest month (with the highest rainfall) is December (4.02").
The driest month (with the least rainfall) is July (0.12").

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Average rainfall days in September
Grants Pass, OR

Average rainfall days in September - Grants Pass, OR
  • Average rainfall days in September: 5.3 days

The month with the highest number of rainy days is March (18.7 days).
The month with the least rainy days is August (2.5 days).

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Average snowfall in September
Grants Pass, OR

Average snowfall in September - Grants Pass, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Grants Pass, OR

Average snowfall days in September - Grants Pass, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Grants Pass, OR

Average daylight in September / Average sunshine in September - Grants Pass, OR
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in September: 10h and 24min

The months with the most sunshine are July and August (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 4h and 42min).

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Average sunshine days in September
Grants Pass, OR

Average sunshine days in September - Grants Pass, OR
  • Average sunshine days in September: 23.9 days

The month with the most sunshine days is July (26.7 days).
The month with the least sunshine days is March (10.8 days).

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Average UV index in September
Grants Pass, OR

Average UV index in September - Grants Pass, OR
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
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
Grants Pass, OR

Average cloud cover in September - Grants Pass, OR
  • Average cloud cover in September: 23

The month with the most cloud cover is March (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 16).

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Average visibility in September
Grants Pass, OR

Average visibility in September - Grants Pass, OR
  • Average visibility in September: 5mi

The month with the highest visibility is August (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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