September weather forecast
Gresham, OR

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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

In September, Gresham begins to experience a hint of autumn as temperatures start to gradually decrease. Following the heat of August, September observes a notable change with temperatures dropping back to an average high of 73°F (22.8°C). This month encompasses a blend of warm days and cooler nights, offering a pleasant contrast. The change in weather is a precursor to the chillier and wetter conditions that await in October.

Temperature

September is characterized by a slight reduction in average high-temperature, easing from a warm 80.4°F (26.9°C) in August to an agreeable 73°F (22.8°C). Against the high September temperatures, Gresham records an average drop to a fresh 50.2°F (10.1°C) at night.

Humidity

In September, the average relative humidity is 69%.

Rainfall

In September, in Gresham, the rain falls for 9.7 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. Throughout the year, there are 165.6 rainfall days, and 34.65" (880mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Gresham.

Daylight

In Gresham, the average length of the day in September is 12h and 31min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:46 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:51 pm PDT.

Sunshine

The average sunshine in September is 9.2h.

UV index

In Gresham, Oregon, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 4 in September interprets into the following advice:
Guard yourself - An obligation to protect skin and eyes from harm exists. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Always opt for UVA and UVB-resistant sunglasses on radiant days.
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Frequently asked questions

What are the temperatures in Gresham in September?

Gresham in September has an average high-temperature of 73°F (22.8°C) and an average low-temperature of 50.2°F (10.1°C).

What is the average humidity in September in Gresham?

The average relative humidity in September in Gresham is 69%.

How many days does it rain in September in Gresham?

In Gresham, Oregon, 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.

What is the average length of the day in September in Gresham?

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

What time are sunrise and sunset in September in Gresham?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:46 pm. On the last day of the month, in Gresham, Oregon, sunrise is at 7:07 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Gresham have in September?

In September, the average sunshine duration 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 of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
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
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 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 1min

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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Gresham, Oregon, USA

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