Saint Helens
Oregon, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Saint Helens, OR

The first month of the autumn, September, is still a warm month in Saint Helens, Oregon, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 76.6°F (24.8°C).

Temperature

In Saint Helens, the average high-temperature in September marginally drops, from 82.4°F (28°C) in August, to a still warm 76.6°F (24.8°C). In September, in Saint Helens, the average low-temperature is 51.4°F (10.8°C).

Rainfall

In September, in Saint Helens, the rain falls for 7 days. Throughout September, 1.7" (43.2mm) of precipitation is accumulated. In Saint Helens, during the entire year, the rain falls for 150 days and collects up to 43.8" (1112.9mm) of precipitation.

Snowfall

In Saint Helens, during the entire year, snow aggregates up to 2.9" (73.7mm).

Daylight

The average length of the day in September in Saint Helens, Oregon, is 12.5h.

What is the temperature in September in Saint Helens?

The average high-temperature, in September, in Saint Helens, Oregon, is 76.6°F (24.8°C), while the average low-temperature is 51.4°F (10.8°C).

How much does it rain in Saint Helens in September?

In Saint Helens, in September, it is raining for 7 days, with typically 1.7" (43.2mm) of accumulated precipitation.

What is the average length of the day in September in Saint Helens?

In Saint Helens, the average length of the day in September is 12.5h.
Average temperature in September - Saint Helens, OR
  • Average high temperature in September: 76.6°F

The warmest month (with the highest average high temperature) is August (82.4°F).
The month with the lowest average high temperature is December (45.7°F).

  • Average low temperature in September: 51.5°F

The month with the highest average low temperature is August (55.4°F).
The coldest month (with the lowest average low temperature) is January (33.1°F).

Average rainfall in September - Saint Helens, OR
  • Average rainfall in September: 1.7"

The wettest month (with the highest rainfall) is December (6.8").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in September - Saint Helens, OR
  • Average rainfall days in September: 7 days

Months with the highest number of rainy days are January, November and December (18 days).
The month with the lowest number of rainy days is July (4 days).

Average snowfall in September - Saint Helens, OR
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.3").
Months with the lowest snowfall are March, April, May, June, July, August, September and October (0").

Average daylight in September - Saint Helens, 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).