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

September weather forecast and climate
Hermiston, OR

The first month of the autumn, September, is still a warm month in Hermiston, Oregon, with average temperature ranging between max 79.7°F (26.5°C) and min 46.9°F (8.3°C).

Temperature

In Hermiston, the average high-temperature in September decreases, from a tropical 88.7°F (31.5°C) in August, to a moderately hot 79.7°F (26.5°C). The average low-temperature, in Hermiston, is 46.9°F (8.3°C).

Rainfall

In September, the rain falls for 4 days. Throughout September, 0.4" (11.2mm) of precipitation is accumulated. Throughout the year, in Hermiston, Oregon, there are 77 rainfall days, and 8.8" (224.6mm) of precipitation is accumulated.

Snowfall

In Hermiston snow does not fall in April through October.

Daylight

The average length of the day in September in Hermiston is 12.5h.

What is the temperature in September in Hermiston?

In Hermiston, Oregon, in September, the average high-temperature is 79.7°F (26.5°C), and the average low-temperature is 46.9°F (8.3°C).

How many days does it rain in September in Hermiston?

In September, the rain falls for 4 days. Throughout September, 0.4" (11.2mm) of precipitation is accumulated.

When it does not snow in Hermiston?

In Hermiston, Oregon, snow does not fall in April through October.

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

In Hermiston, Oregon, the average length of the day in September is 12.5h.
Average temperature in September - Hermiston, OR
  • Average high temperature in September: 79.7°F

The warmest month (with the highest average high temperature) is July (90.4°F).
The month with the lowest average high temperature is January (39.9°F).

  • Average low temperature in September: 47°F

The month with the highest average low temperature is July (57.1°F).
The coldest month (with the lowest average low temperature) is January (23.6°F).

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

Wettest months (with the highest rainfall) are January, November and December (1.2").
The driest month (with the lowest rainfall) is July (0.2").

Average rainfall days in September - Hermiston, OR
  • Average rainfall days in September: 4 days

The month with the highest number of rainy days is December (11 days).
Months with the lowest number of rainy days are July and August (2 days).

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

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

Average daylight in September - Hermiston, 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).