Sisters
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Sisters, OR

The first month of the autumn, September, is still a warm month in Sisters, Oregon, with temperature in the range of an average low of 35.4°F (1.9°C) and an average high of 75.4°F (24.1°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 83.5°F (28.6°C) in August, to a still warm 75.4°F (24.1°C). The average low-temperature, in September, is 35.4°F (1.9°C).

Rainfall

In September, in Sisters, Oregon, the rain falls for 3 days. Throughout September, 0.4" (10.2mm) of precipitation is accumulated. Throughout the year, in Sisters, there are 72 rainfall days, and 13.5" (342.9mm) of precipitation is accumulated.

Snowfall

In Sisters, Oregon, it doesn't snow. In October, it regularly snows. In Sisters, Oregon, during the entire year, snow aggregates up to 30.1" (764.5mm).

Daylight

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

What is the temperature in September in Sisters?

In September, in Sisters, Oregon, the average high-temperature is 75.4°F (24.1°C), and the average low-temperature is 35.4°F (1.9°C).

How many days does it rain in September in Sisters?

In Sisters, in September, during 3 rainfall days, 0.4" (10.2mm) of precipitation is typically accumulated.

Does it snow in Sisters in September?

In Sisters, Oregon, in September, it doesn't snow. In October, it regularly snows.

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

In Sisters, Oregon, the average length of the day in September is 12.5h.
Average temperature in September - Sisters, OR
  • Average high temperature in September: 75.3°F

The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is December (40.5°F).

  • Average low temperature in September: 35.5°F

The month with the highest average low temperature is July (42.4°F).
The coldest month (with the lowest average low temperature) is December (20.9°F).

Average rainfall in September - Sisters, OR
  • Average rainfall in September: 0.4"

The wettest month (with the highest rainfall) is December (2.3").
Driest months (with the lowest rainfall) are July, August and September (0.4").

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

The month with the highest number of rainy days is November (10 days).
The month with the lowest number of rainy days is July (2 days).

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

The month with the highest snowfall is January (8.3").
Months with the lowest snowfall are May, June, July, August and September (0").

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

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).