September weather forecast
John Day, OR

The iconic Painted Hills in the famous John Day Fossil Beds National Monument, Oregon
The iconic Painted Hills in the famous John Day Fossil Beds National Monument, Oregon

Weather in September

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

Temperature

In John Day, the average high-temperature in September decreases from a warm 81°F (27.2°C) in August to a pleasant 71.2°F (21.8°C). The average low-temperature, in September, is 44.2°F (6.8°C).

Humidity

In September, the average relative humidity in John Day, Oregon, is 51%.

Rainfall

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

Snowfall

January through May, September through December are months with snowfall in John Day. September is the first month it typically snows in John Day. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. Throughout the year, in John Day, there are 62.5 snowfall days, and 39.17" (995mm) of snow is accumulated.

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 7:32 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:38 pm PDT.

Sunshine

In September, the average sunshine in John Day is 10.7h.

UV index

In September, the average daily maximum UV index in John Day is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 3 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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in September in John Day?

In September, the average relative humidity is 51%.

How much does it rain in John Day in September?

In John Day, Oregon, during September, the rain falls for 6.6 days and regularly aggregates up to 0.55" (14mm) of precipitation.

When does it start snowing in John Day?

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

What is the average length of the day in September in John Day?

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

What time are sunrise and sunset in September in John Day?

On the first day of September, sunrise is at 6:18 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:52 am and sunset at 6:38 pm PDT.

How long on average sun shines in September in John Day?

In September, the average sunshine duration in John Day is 10.7h.

What is the UV index reading in September in John Day?

In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health risk from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
John Day, OR

Average temperature in September - John Day, 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).

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Average pressure in September
John Day, OR

Average pressure in September - John Day, 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).

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Average wind speed in September
John Day, OR

Average wind speed in September - John Day, 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).

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Average humidity in September
John Day, OR

Average humidity in September - John Day, 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%).

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Average rainfall in September
John Day, OR

Average rainfall in September - John Day, 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").

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Average rainfall days in September
John Day, OR

Average rainfall days in September - John Day, 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).

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Average snowfall in September
John Day, OR

Average snowfall in September - John Day, 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").

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Average snowfall days in September
John Day, OR

Average snowfall days in September - John Day, 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).

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Average daylight in September /
Average sunshine in September
John Day, OR

Average daylight in September / Average sunshine in September - John Day, OR
  • Average daylight in September: 12h and 30min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in September: 10h and 42min

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).

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Average sunshine days in September
John Day, OR

Average sunshine days in September - John Day, 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).

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Average UV index in September
John Day, OR

Average UV index in September - John Day, 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).

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Average cloud cover in September
John Day, OR

Average cloud cover in September - John Day, 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).

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Average visibility in September
John Day, OR

Average visibility in September - John Day, 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).

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