September weather forecast
Omak, WA

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Weather in September

September, the first month of the autumn in Omak, is also an agreeable month, with an average temperature varying between 70.9°F (21.6°C) and 47.3°F (8.5°C).

Temperature

As September begins, there is a decrease in the average high-temperature, falling from a moderately hot 82.4°F (28°C) in August to a pleasant 70.9°F (21.6°C). Omak observes a dramatic plunge from daytime highs in September, settling at an average low-temperature of 47.3°F (8.5°C).

Humidity

The average relative humidity in September is 52%.

Rainfall

In September, the rain falls for 5.3 days. Throughout September, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 90.2 rainfall days, and 7.56" (192mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Omak.

Daylight

In Omak, the average length of the day in September is 12h and 34min.
On the first day of September, sunrise is at 6:16 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:38 pm PDT.

Sunshine

In September, the average sunshine is 10.8h.

UV index

In Omak, 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 radiation for ordinary individuals.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Prioritize safety - Suggestions to prevent sun damage are offered. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays.
Updated: Jul 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in Omak, is 70.9°F (21.6°C), while the low-temperature averages to 47.3°F (8.5°C). In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, is estimated at 82.4°F (28°C).

What is the average humidity in September?

In Omak, the average relative humidity in September is 52%.

How much does it rain in September?

In Omak, Washington, in September, during 5.3 rainfall days, 0.51" (13mm) of precipitation is typically accumulated.

When it does not snow?

In Omak, snow does not fall in May through October.

How many hours of daylight does Omak have in September?

In Omak, Washington, the average day length in September is 12h and 34min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:16 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:38 pm PDT.

How many hours of sunshine does Omak have in September?

In September, the average sunshine duration is 10.8h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe 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
Omak, WA

Average temperature in September - Omak, WA
  • Average high temperature in September: 70.9°F

The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (30.4°F).

  • Average low temperature in September: 47.3°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).

Average pressure in September
Omak, WA

Average pressure in September - Omak, WA
  • Average pressure in September: 29.97"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).

Average wind speed in September
Omak, WA

Average wind speed in September - Omak, WA
  • Average wind speed in September: 4.7mph

The windiest month (with the highest average wind speed) is April (5.1mph).
The calmest month (with the lowest average wind speed) is January (4mph).

Average humidity in September
Omak, WA

Average humidity in September - Omak, WA
  • Average humidity in September: 52%

The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are July and August (42%).

Average rainfall in September
Omak, WA

Average rainfall in September - Omak, WA
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and August (0.2").

Average rainfall days in September
Omak, WA

Average rainfall days in September - Omak, WA
  • Average rainfall days in September: 5.3 days

The month with the highest number of rainy days is March (11.5 days).
The month with the least rainy days is August (2.8 days).

Average snowfall in September
Omak, WA

Average snowfall in September - Omak, WA
  • Average snowfall in September: 0"

The month with the highest snowfall is January (3.39").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
Omak, WA

Average snowfall days in September - Omak, WA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
Omak, WA

Average daylight in September / Average sunshine in September - Omak, WA
  • Average daylight in September: 12h and 4min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in September: 10h and 5min

The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in September
Omak, WA

Average sunshine days in September - Omak, WA
  • Average sunshine days in September: 23.4 days

The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is November (15.4 days).

Average UV index in September
Omak, WA

Average UV index in September - Omak, WA
  • Average UV index in September: 4

The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).

Average cloud cover in September
Omak, WA

Average cloud cover in September - Omak, WA
  • Average cloud cover in September: 18

The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 12).

Average visibility in September
Omak, WA

Average visibility in September - Omak, WA
  • 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).

Omak, Washington, USA

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