September weather forecast and climate
Umatilla, OR

The first month of the autumn, September, is still a warm month in Umatilla, Oregon, with average temperature varying between 48.9°F (9.4°C) and 80.8°F (27.1°C).

Temperature

In Umatilla, the average high-temperature is 80.8°F (27.1°C), and the average low-temperature is 48.9°F (9.4°C).

Rainfall

In Umatilla, Oregon, in September, during 3 rainfall days, 0.4" (11.4mm) of precipitation is typically accumulated. Throughout the year, there are 60 rainfall days, and 8" (203.8mm) of precipitation is accumulated.

Snowfall

In Umatilla, during the entire year, snow aggregates up to 8.1" (205.7mm).

Daylight

In Umatilla, the average length of the day in September is 12.5h.

What is the temperature in September in Umatilla?

In September, the average high-temperature is 80.8°F (27.1°C), and the average low-temperature is 48.9°F (9.4°C).

How many days does it rain in September in Umatilla?

In Umatilla, Oregon, in September, during 3 rainfall days, 0.4" (11.4mm) of precipitation is typically accumulated.

How many hours of daylight does Umatilla have in September?

The average length of the day in September in Umatilla is 12.5h.
Average temperature in September - Umatilla, OR
  • Average high temperature in September: 27.1°C

The warmest month (with the highest average high temperature) is July (33.7°C).
The month with the lowest average high temperature is January (4.4°C).

  • Average low temperature in September: 9.4°C

The month with the highest average low temperature is July (15.2°C).
The coldest month (with the lowest average low temperature) is January (-3.8°C).

Average rainfall in September - Umatilla, OR
  • Average rainfall in September: 11.4mm

The wettest month (with the highest rainfall) is December (27.7mm).
The driest month (with the lowest rainfall) is July (4.1mm).

Average rainfall days in September - Umatilla, OR
  • Average rainfall days in September: 3 days

Months with the highest number of rainy days are January and December (8 days).
The month with the lowest number of rainy days is July (1 days).

Average snowfall in September - Umatilla, OR
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (99.1mm).
Months with the lowest snowfall are April, May, June, July, August, September and October (0mm).

Average daylight in September - Umatilla, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.7h).
The month with shortest days is December (Average daylight: 8.7h).

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