September weather forecast
Salem, OR

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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's weather in Salem is a blend of summer and fall, with warmth fading gradually. Compared to August, rainfall inches up to 1.22, signaling the starting shift towards the wet season. However, September remains an ideal time for visiting the city's attractions and taking part in local events. The transition brought by September is a welcome change for many, as it leads Salem into the bounty of fall.

Temperature

The onset of September in Salem entails a subtle temperature shift, as the average high-temperature eases from a warm 82°F in August to a still moderately hot 74.7°F. Salem records a marked divergence from the day's high temperatures, with nights in September averaging at a fresh 50.9°F.

Humidity

The average relative humidity in September is 70%.

Rainfall

In Salem, during September, the rain falls for 8.9 days and regularly aggregates up to 1.22" of precipitation. Throughout the year, in Salem, there are 162.5 rainfall days, and 25.08" of precipitation is accumulated.

Snowfall

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

Daylight

In Salem, the average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 6:34 am and sunset at 7:49 pm. On the last day of September, in Salem, sunrise is at 7:09 am and sunset at 6:55 pm PDT.

Sunshine

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

UV index

In Salem, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: The daily high UV index of 4 during September translates into the following recommendations:
Make use of precautions - Suggestions to resist sunburn are communicated. It's recommended to limit sun exposure when its radiation is at its peak during midday. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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FAQ

What is the average September temperature in Salem?

Salem in September has an average high-temperature of 74.7°F and an average low-temperature of 50.9°F. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 86°F.

What is the average humidity in September in Salem?

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

How many days does it rain in September in Salem?

In Salem, Oregon, in September, it is raining for 8.9 days, with typically 1.22" of accumulated precipitation.

When it does not snow in Salem?

April through October are months without snowfall.

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

In Salem, the average day length in September is 12h and 30min.

What time are sunrise and sunset in September in Salem?

In September, on the first day of the month, sunrise is at 6:34 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:55 pm PDT.

How long on average sun shines in September in Salem?

In September, the average sunshine duration is 9.4h.

What is the UV index reading in September in Salem?

In Salem, Oregon, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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%

The 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").
The 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).
The 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: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is August (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 12min).

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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).
The 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

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

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Salem, Oregon, USA

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