September weather forecast
Prairie City, OR

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Weather in September

The first month of the autumn, September, is still a pleasant month in Prairie City, Oregon, with an average temperature varying between 71.2°F (21.8°C) and 44.2°F (6.8°C).

Temperature

The average high-temperature decreases in September, shifting from a moderately hot 81°F (27.2°C) in August to an agreeable 71.2°F (21.8°C). A considerable shift from the daytime highs is observed in Prairie City during September nights, with an average low of 44.2°F (6.8°C).

Humidity

In September, the average relative humidity is 51%.

Rainfall

In Prairie City, in September, it is raining for 6.6 days, with typically 0.55" (14mm) of accumulated precipitation. Throughout the year, in Prairie City, there are 127.7 rainfall days, and 17.09" (434mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows in Prairie City. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Prairie City, during the entire year, snow falls for 62.5 days and aggregates up to 39.17" (995mm) of snow.

Daylight

The average length of the day in September is 12h and 30min.
On the first day of the month, sunrise is at 6:18 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:36 pm PDT.

Sunshine

In September, the average sunshine is 10.7h.

UV index

The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The UV index of 3 during September leads to these advisories:
Ensure safety - Imperative it is to shield skin and eyes from damage. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Updated: Jul 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Prairie City in September?

During September, Prairie City experiences an average high-temperature of 71.2°F (21.8°C) and a low-temperature of 44.2°F (6.8°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in August is appraised at 80.6°F (27°C).

What is the average humidity in September?

In Prairie City, the average relative humidity in September is 51%.

How many days does it rain in September?

In September, the rain falls for 6.6 days. Throughout September, 0.55" (14mm) of precipitation is accumulated.

When does it start to snow in Prairie City?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Prairie City have in September?

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

When are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:18 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:36 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration is 10.7h.

How high is the UV index in September?

The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Prairie City, OR

Average temperature in September - Prairie City, OR
  • Average high temperature in September: 71.2°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (33.4°F).

  • Average low temperature in September: 44.2°F

The month with the highest average low temperature is August (49.6°F).
The coldest month (with the lowest average low temperature) is December (19.6°F).

Average pressure in September
Prairie City, OR

Average pressure in September - Prairie City, OR
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).

Average wind speed in September
Prairie City, OR

Average wind speed in September - Prairie City, OR
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest months (with the lowest average wind speed) are August and September (5mph).

Average humidity in September
Prairie City, OR

Average humidity in September - Prairie City, OR
  • Average humidity in September: 51%

The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is August (42%).

Average rainfall in September
Prairie City, OR

Average rainfall in September - Prairie City, OR
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is February (2.28").
The driest month (with the least rainfall) is July (0.24").

Average rainfall days in September
Prairie City, OR

Average rainfall days in September - Prairie City, OR
  • Average rainfall days in September: 6.6 days

The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (3.3 days).

Average snowfall in September
Prairie City, OR

Average snowfall in September - Prairie City, OR
  • Average snowfall in September: 0.08"

The month with the highest snowfall is February (10.31").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Prairie City, OR

Average snowfall days in September - Prairie City, OR
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (14.5 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in September /
Average sunshine in September
Prairie City, OR

Average daylight in September / Average sunshine in September - Prairie City, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 10h and 4min

The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and February (Average sunshine: 5h and 12min).

Average sunshine days in September
Prairie City, OR

Average sunshine days in September - Prairie City, OR
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is July (24.9 days).
The month with the least sunshine days is February (9 days).

Average UV index in September
Prairie City, OR

Average UV index in September - Prairie City, OR
  • Average UV index in September: 3

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

Average cloud cover in September
Prairie City, OR

Average cloud cover in September - Prairie City, OR
  • Average cloud cover in September: 17

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 9).

Average visibility in September
Prairie City, OR

Average visibility in September - Prairie City, OR
  • Average visibility in September: 6mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).

Prairie City, Oregon, USA

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