September weather forecast
Alfalfa, OR

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Weather in September

September, the first month of the autumn in Alfalfa, is still a pleasant month, with temperature in the range of an average low of 48.4°F (9.1°C) and an average high of 71.1°F (21.7°C).

Temperature

September brings a minor decrease, with the average high-temperature reducing from a moderately hot 80.6°F (27°C) in August to an agreeable 71.1°F (21.7°C). Alfalfa receives a consistent average low-temperature of 48.4°F (9.1°C) in September, a substantial dip from the day's heat.

Humidity

In Alfalfa, the average relative humidity in September is 50%.

Rainfall

In Alfalfa, Oregon, during September, the rain falls for 3.7 days and regularly aggregates up to 0.35" (9mm) of precipitation. In Alfalfa, during the entire year, the rain falls for 65.5 days and collects up to 5.67" (144mm) of precipitation.

Snowfall

January through April, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. In Alfalfa, during the entire year, snow falls for 20.9 days and aggregates up to 9.02" (229mm) of snow.

Daylight

In Alfalfa, the average length of the day in September is 12h and 29min.
On the first day of the month, sunrise is at 6:28 am and sunset at 7:39 pm. On the last day of September, in Alfalfa, sunrise is at 7:01 am and sunset at 6:45 pm PDT.

Sunshine

In September, the average sunshine is 11h.

UV index

In Alfalfa, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the usual temperature for Alfalfa in September?

September temperatures in Alfalfa vary between a high-temperature of 71.1°F (21.7°C) and a low-temperature of 48.4°F (9.1°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 80.6°F (27°C).

What is the average humidity in September in Alfalfa?

In Alfalfa, Oregon, the average relative humidity in September is 50%.

How many days does it rain in September in Alfalfa?

In Alfalfa, in September, it is raining for 3.7 days, with typically 0.35" (9mm) of accumulated precipitation.

When does it start snowing in Alfalfa?

September is the first month it typically snows in Alfalfa, Oregon. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow.

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

In Alfalfa, Oregon, the average day length in September is 12h and 29min.

When is the sunrise / sunset in September in Alfalfa?

On the first day of September in Alfalfa, sunrise is at 6:28 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:45 pm PDT.

How many hours of sunshine does Alfalfa have in September?

The average sunshine duration in September in Alfalfa, Oregon, is 11h.

How high is the UV index in September in Alfalfa?

In Alfalfa, Oregon, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium health risk 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
Alfalfa, OR

Average temperature in September - Alfalfa, OR
  • Average high temperature in September: 71.1°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is December (36.1°F).

  • Average low temperature in September: 48.4°F

The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (24.3°F).

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Average pressure in September
Alfalfa, OR

Average pressure in September - Alfalfa, OR
  • Average pressure in September: 29.99"Hg

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).

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Average wind speed in September
Alfalfa, OR

Average wind speed in September - Alfalfa, OR
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest months (with the lowest average wind speed) are August and September (5.7mph).

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Average humidity in September
Alfalfa, OR

Average humidity in September - Alfalfa, OR
  • Average humidity in September: 50%

The month with the highest relative humidity is December (81%).
The months with the lowest relative humidity are July and August (43%).

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Average rainfall in September
Alfalfa, OR

Average rainfall in September - Alfalfa, OR
  • Average rainfall in September: 0.35"

The wettest month (with the highest rainfall) is May (0.67").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days in September
Alfalfa, OR

Average rainfall days in September - Alfalfa, OR
  • Average rainfall days in September: 3.7 days

The month with the highest number of rainy days is March (9 days).
The month with the least rainy days is July (2 days).

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Average snowfall in September
Alfalfa, OR

Average snowfall in September - Alfalfa, OR
  • Average snowfall in September: 0.04"

The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July and August (0").

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Average snowfall days in September
Alfalfa, OR

Average snowfall days in September - Alfalfa, OR
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (4.8 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
Alfalfa, OR

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

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in September: 11h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Alfalfa, OR

Average sunshine days in September - Alfalfa, OR
  • Average sunshine days in September: 25.8 days

The month with the most sunshine days is July (28.3 days).
The month with the least sunshine days is March (19.5 days).

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Average UV index in September
Alfalfa, OR

Average UV index in September - Alfalfa, 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, November and December (UV index 2).

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Average cloud cover in September
Alfalfa, OR

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

The month with the most cloud cover is December (Cloud cover 45).
The months with the least cloud cover are July and August (Cloud cover 9).

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Average visibility in September
Alfalfa, OR

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

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

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Alfalfa, Oregon, USA

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