September weather forecast and climate
Salem, OR

An evening shot of the leafy town of Salem in Oregon
An evening shot of the leafy town of Salem in Oregon

Weather in September

September, the first month of the autumn, in Salem, is still a warm month, with temperature in the range of an average low of 50.9°F (10.5°C) and an average high of 74.7°F (23.7°C).

Temperature

In September, the average high-temperature marginally drops, from 82°F (27.8°C) in August, to a still moderately hot 74.7°F (23.7°C). In September, in Salem, the average low-temperature is 50.9°F (10.5°C).

Humidity

In September, the average relative humidity in Salem is 70%.

Rainfall

In Salem, in September, it is raining for 8.9 days, with typically 1.22" (31mm) of accumulated precipitation. In Salem, Oregon, during the entire year, the rain falls for 162.5 days and collects up to 25.08" (637mm) of precipitation.

Snowfall

April through October are months without snowfall in Salem.

Daylight

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

Sunshine

In Salem, the average sunshine is 9.4h.

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Salem?

In September, in Salem, the average high-temperature is 74.7°F (23.7°C), and the average low-temperature is 50.9°F (10.5°C).

What is the average humidity in September in Salem?

In September, the average relative humidity in Salem, Oregon, is 70%.

How much does it rain in Salem in September?

In Salem, during September, the rain falls for 8.9 days and regularly aggregates up to 1.22" (31mm) of precipitation.

When it does not snow in Salem?

In Salem snow does not fall in April through October.

How many hours of daylight does Salem have in September?

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

How long on average sun shines in September in Salem?

In Salem, the average sunshine in September is 9.4h.

How high is the UV index in September in Salem?

The average daily maximum UV index in September in Salem is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Salem, OR

Average temperature in September - Salem, OR
  • Average high temperature in September: 74.7°F

The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (45.5°F).

  • Average low temperature in September: 50.9°F

The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (34.5°F).

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Average pressure in September
Salem, OR

Average pressure in September - Salem, OR
  • Average pressure in September: 30.01"

The month with the highest atmospheric pressure is January (30.11").
Months with the lowest atmospheric pressure are August and September (30.01").

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Average wind speed in September
Salem, OR

Average wind speed in September - Salem, OR
  • Average wind speed in September: 4.4mph

The windiest months (with the highest average wind speed) are January, March and November (5.5mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

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Average humidity in September
Salem, OR

Average humidity in September - Salem, OR
  • Average humidity in September: 70%

Months with the highest relative humidity are January, February and December (86%).
The month with the lowest relative humidity is August (65%).

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Average rainfall in September
Salem, OR

Average rainfall in September - Salem, OR
  • Average rainfall in September: 1.22"

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (0.28").

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Average rainfall days in September
Salem, OR

Average rainfall days in September - Salem, OR
  • Average rainfall days in September: 8.9 days

The month with the highest number of rainy days is March (19.6 days).
The month with the least rainy days is July (3.9 days).

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Average snowfall in September
Salem, OR

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

The month with the highest snowfall is February (1.18").
Months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Salem, OR

Average snowfall days in September - Salem, OR
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.8 days).
Months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Salem, OR

Average daylight in September / Average sunshine in September - Salem, OR
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.6h).
The month with the shortest days is December (Average daylight: 8.8h).

  • Average sunshine in September: 9.4h

The month with the most sunshine is August (Average sunshine: 11h).
The month with the least sunshine is February (Average sunshine: 4.2h).

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Average sunshine days in September
Salem, OR

Average sunshine days in September - Salem, OR
  • Average sunshine days in September: 20 days

The month with the most sunshine days is July (26.3 days).
The month with the least sunshine days is March (8.8 days).

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Average UV index in September
Salem, OR

Average UV index in September - Salem, OR
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Salem, OR

Average cloud cover in September - Salem, OR
  • Average cloud cover in September: 32

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 21).

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Average visibility in September
Salem, OR

Average visibility in September - Salem, OR
  • Average visibility in September: 6mi

Months with the highest visibility are July, August and September (6mi).
Months with the lowest visibility are January, February, March, April, May, June, October, November and December (5mi).

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