September weather forecast
Heppner, OR

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Weather in September

The first month of the autumn, September, is also an agreeable month in Heppner, Oregon, with temperature in the range of an average low of 54.1°F (12.3°C) and an average high of 72.7°F (22.6°C).

Temperature

As Heppner enters September, the average high-temperature decreases from the a warm 82.2°F (27.9°C) of August to a pleasant 72.7°F (22.6°C). During September, the average low-temperature in Heppner is a fresh 54.1°F (12.3°C).

Humidity

The average relative humidity in September in Heppner is 47%.

Rainfall

In Heppner, Oregon, in September, it is raining for 6.6 days, with typically 0.47" (12mm) of accumulated precipitation. Throughout the year, there are 131.9 rainfall days, and 13.54" (344mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall in Heppner. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.24" (6mm) of snow. Throughout the year, there are 31.3 snowfall days, and 18.54" (471mm) of snow is accumulated.

Daylight

The average length of the day in September in Heppner is 12h and 31min.
On the first day of September, sunrise is at 6:20 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:39 pm PDT.

Sunshine

The average sunshine in September is 10.8h.

UV index

The average daily maximum UV index in September in Heppner is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 4 in September translates into these instructions:
Undertake protective steps - Preventing sun damage is advised. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Frequently asked questions

What are the temperatures in Heppner in September?

In Heppner, in September, the average high-temperature is 72.7°F (22.6°C), and the average low-temperature is 54.1°F (12.3°C).

What is the average humidity in September in Heppner?

In September, the average relative humidity is 47%.

How much does it rain in Heppner in September?

In Heppner, Oregon, during September, the rain falls for 6.6 days and regularly aggregates up to 0.47" (12mm) of precipitation.

When does it start snowing in Heppner?

September is the first month it typically snows in Heppner, Oregon. Throughout September, in the average 0.3 snowfall days, it receives 0.24" (6mm) of snow.

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

The average day length in September is 12h and 31min.

What time are sunrise and sunset in September in Heppner?

In September, on the first day of the month, sunrise is at 6:20 am and sunset at 7:35 pm. On the last day of the month, in Heppner, Oregon, sunrise is at 6:56 am and sunset at 6:39 pm PDT.

How many hours of sunshine does Heppner have in September?

In September, the average sunshine duration in Heppner, Oregon, is 10.8h.

What is the UV index intensity in September in Heppner?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
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
Heppner, OR

Average temperature in September - Heppner, OR
  • Average high temperature in September: 72.7°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (37.9°F).

  • Average low temperature in September: 54.1°F

The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).

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Average pressure in September
Heppner, OR

Average pressure in September - Heppner, OR
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).

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Average wind speed in September
Heppner, OR

Average wind speed in September - Heppner, OR
  • Average wind speed in September: 7.2mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest month (with the lowest average wind speed) is September (7.2mph).

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Average humidity in September
Heppner, OR

Average humidity in September - Heppner, OR
  • Average humidity in September: 47%

The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (39%).

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Average rainfall in September
Heppner, OR

Average rainfall in September - Heppner, OR
  • Average rainfall in September: 0.47"

The wettest month (with the highest rainfall) is February (1.81").
The driest month (with the least rainfall) is July (0.24").

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Average rainfall days in September
Heppner, OR

Average rainfall days in September - Heppner, OR
  • Average rainfall days in September: 6.6 days

The month with the highest number of rainy days is March (17 days).
The month with the least rainy days is August (4.1 days).

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Average snowfall in September
Heppner, OR

Average snowfall in September - Heppner, OR
  • Average snowfall in September: 0.24"

The month with the highest snowfall is February (6.61").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Heppner, OR

Average snowfall days in September - Heppner, OR
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (9.2 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
Heppner, OR

Average daylight in September / Average sunshine in September - Heppner, 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: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 5h and 18min).

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Average sunshine days in September
Heppner, OR

Average sunshine days in September - Heppner, OR
  • Average sunshine days in September: 21.2 days

The month with the most sunshine days is July (24.4 days).
The month with the least sunshine days is March (9.5 days).

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Average UV index in September
Heppner, OR

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

The month with the highest UV index is July (UV index 7).
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
Heppner, OR

Average cloud cover in September - Heppner, OR
  • Average cloud cover in September: 16

The months with the most cloud cover are January and February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in September
Heppner, OR

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

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

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Heppner, Oregon, USA

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