O'Brien
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
O'Brien, OR

The first month of the autumn, September, is still a tropical month in O'Brien, Oregon, with average temperature fluctuating between 88°F (31.1°C) and 45°F (7.2°C).

Temperature

In September, the average high-temperature marginally drops, from a hot 93.9°F (34.4°C) in August, to a still tropical 88°F (31.1°C). In September, in O'Brien, the average low-temperature is 45°F (7.2°C).

Rainfall

Throughout September, in O'Brien, 0.8" (20.3mm) of precipitation is accumulated. During the entire year, O'Brien aggregates up to 63.2" (1605.3mm) of precipitation.

Snowfall

In O'Brien snow does not fall in May through October.

Daylight

In O'Brien, the average length of the day in September is 12.5h.

What is the temperature in September in O'Brien?

In September, in O'Brien, Oregon, the average high-temperature is 88°F (31.1°C), and the average low-temperature is 45°F (7.2°C).

How much does it rain in O'Brien in September?

During September, O'Brien regularly aggregates up to 0.8" (20.3mm) of precipitation.

When it does not snow in O'Brien?

In O'Brien snow does not fall in May through October.

What is the average length of the day in September in O'Brien?

The average length of the day in September in O'Brien, Oregon, is 12.5h.
Average temperature in September - O
  • Average high temperature in September: 88°F

Warmest months (with the highest average high temperature) are July and August (94°F).
The month with the lowest average high temperature is December (50°F).

  • Average low temperature in September: 45°F

The month with the highest average low temperature is July (52°F).
Coldest months (with the lowest average low temperature) are January and December (33°F).

Average rainfall in September - O
  • Average rainfall in September: 0.8"

The wettest month (with the highest rainfall) is December (13").
The driest month (with the lowest rainfall) is July (0.3").

Average snowfall in September - O
  • Average snowfall in September: 0"

The month with the highest snowfall is January (4.1").
Months with the lowest snowfall are May, June, July, August, September and October (0").

Average daylight in September - O
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.2h).