September weather forecast
Gresham, OR

The fall colors in the trees and the fields around a beautiful house in Gresham, Oregon
The fall colors in the trees and the fields around a beautiful house in Gresham, Oregon

Weather in September

September, the first month of the autumn in Gresham, is also an agreeable month, with an average temperature fluctuating between 73°F (22.8°C) and 50.2°F (10.1°C).

Temperature

In September, the average high-temperature slightly decreases from a moderately hot 80.4°F (26.9°C) in August to a pleasant 73°F (22.8°C). The average low-temperature, in September, is 50.2°F (10.1°C).

Humidity

The average relative humidity in September is 69%.

Rainfall

In Gresham, it is raining for 9.7 days, with typically 1.85" (47mm) of accumulated precipitation. In Gresham, during the entire year, the rain falls for 165.6 days and collects up to 34.65" (880mm) of precipitation.

Snowfall

April through October are months without snowfall in Gresham.

Daylight

The average length of the day in September in Gresham is 12h and 31min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:47 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:52 pm PDT.

Sunshine

The average sunshine in September in Gresham is 9.2h.

UV index

In Gresham, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the average humidity in September in Gresham?

In Gresham, Oregon, the average relative humidity in September is 69%.

How much does it rain in Gresham in September?

In Gresham, in September, during 9.7 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow in Gresham?

In Gresham, snow does not fall in April through October.

How many hours of daylight does Gresham have in September?

In September, the average day length in Gresham is 12h and 31min.

What time are sunrise and sunset in September in Gresham?

On the first day of September, sunrise is at 6:31 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:52 pm PDT.

How many hours of sunshine does Gresham have in September?

In September, the average sunshine duration in Gresham is 9.2h.

What is the UV index reading in September in Gresham?

In September, the average daily maximum UV index in Gresham, Oregon, is 4. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to 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
Gresham, OR

Average temperature in September - Gresham, OR
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is August (80.4°F).
The month with the lowest average high temperature is December (43.7°F).

  • Average low temperature in September: 50.2°F

The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is December (33.8°F).

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Average pressure in September
Gresham, OR

Average pressure in September - Gresham, OR
  • Average pressure in September: 30.01"Hg

The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

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Average wind speed in September
Gresham, OR

Average wind speed in September - Gresham, OR
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is January (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).

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Average humidity in September
Gresham, OR

Average humidity in September - Gresham, OR
  • Average humidity in September: 69%

The month with the highest relative humidity is February (84%).
The month with the lowest relative humidity is August (64%).

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Average rainfall in September
Gresham, OR

Average rainfall in September - Gresham, OR
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is December (5.31").
The driest month (with the least rainfall) is July (0.31").

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Average rainfall days in September
Gresham, OR

Average rainfall days in September - Gresham, OR
  • Average rainfall days in September: 9.7 days

The month with the highest number of rainy days is March (19.3 days).
The month with the least rainy days is August (4.4 days).

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Average snowfall in September
Gresham, OR

Average snowfall in September - Gresham, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is March (1.73").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Gresham, OR

Average snowfall days in September - Gresham, 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
Gresham, OR

Average daylight in September / Average sunshine in September - Gresham, OR
  • Average daylight in September: 12h and 31min

The month with the longest days is June (Average daylight: 15h and 37min).
The month with the shortest days is December (Average daylight: 8h and 47min).

  • Average sunshine in September: 9h and 12min

The months with the most sunshine are July and August (Average sunshine: 10h and 54min).
The months with the least sunshine are January and February (Average sunshine: 4h and 12min).

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Average sunshine days in September
Gresham, OR

Average sunshine days in September - Gresham, OR
  • Average sunshine days in September: 18.5 days

The month with the most sunshine days is July (25 days).
The month with the least sunshine days is February (9.7 days).

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Average UV index in September
Gresham, OR

Average UV index in September - Gresham, 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
Gresham, OR

Average cloud cover in September - Gresham, OR
  • Average cloud cover in September: 33

The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 24).

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Average visibility in September
Gresham, OR

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

The months with the highest visibility are August, September and October (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, November and December (5mi).

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