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 fluctuating between 77.4°F (25.2°C) and 45°F (7.2°C).

Temperature

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

Humidity

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

Rainfall

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

Snowfall

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

Daylight

In Grants Pass, the average length of the day in September is 12h and 28min.
On the first day of September in Grants Pass, Oregon, sunrise is at 6:38 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:56 pm PDT.

Sunshine

The average sunshine in September is 10.4h.

UV index

In September, the average daily maximum UV index in Grants Pass is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

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, Oregon, 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, snow does not fall in May through October.

What is the average length of the day in September in Grants Pass?

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

What time are sunrise and sunset in September in Grants Pass?

On the first day of September in Grants Pass, sunrise is at 6:38 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:56 pm PDT.

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

In Grants Pass, the average sunshine duration in September is 10.4h.

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

In September, the average daily maximum UV index in Grants Pass is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
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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