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

September weather forecast and climate
Ontario, OR

The first month of the autumn, September, is still a warm month in Ontario, Oregon, with average temperature varying between 45°F (7.2°C) and 81°F (27.2°C).

Temperature

In September, the average high-temperature decreases, from a hot 91°F (32.8°C) in August, to a warm 81°F (27.2°C). In September, in Ontario, the average low-temperature is 45°F (7.2°C).

Rainfall

During September, Ontario regularly aggregates up to 0.5" (11.9mm) of precipitation. Throughout the year, in Ontario, 9.4" (239.9mm) of rain is accumulated.

Snowfall

In Ontario snow does not fall in April through October.

Daylight

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

What is the temperature in September in Ontario?

In September, in Ontario, the average high-temperature is 81°F (27.2°C), and the average low-temperature is 45°F (7.2°C).

How much does it rain in Ontario in September?

Throughout September, in Ontario, Oregon, 0.5" (11.9mm) of precipitation is accumulated.

When it does not snow in Ontario?

In Ontario snow does not fall in April through October.

How many hours of daylight does Ontario have in September?

In Ontario, Oregon, the average length of the day in September is 12.5h.
Average temperature in September - Ontario, OR
  • Average high temperature in September: 81°F

The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is January (34°F).

  • Average low temperature in September: 45°F

The month with the highest average low temperature is July (57°F).
The coldest month (with the lowest average low temperature) is January (18°F).

Average rainfall in September - Ontario, OR
  • Average rainfall in September: 0.5"

The wettest month (with the highest rainfall) is December (1.4").
Driest months (with the lowest rainfall) are July and August (0.3").

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

The month with the highest snowfall is December (5").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

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

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 8.9h).