Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
September's onset corresponds with a shift in the average high-temperature, moving from a warm 83.7°F (28.7°C) in August to a pleasant 72.5°F (22.5°C). An average nighttime temperature of 51.1°F (10.6°C) is noted during the month of September.Humidity
The average relative humidity in September is 47%.Rainfall
In Reardan, in September, it is raining for 7.2 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, there are 118 rainfall days, and 15.24" (387mm) of precipitation is accumulated.Snowfall
January through May, 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 0.31" (8mm) of snow. In Reardan, during the entire year, snow falls for 60.5 days and aggregates up to 36.18" (919mm) of snow.Daylight
In Reardan, the average length of the day in September is 12h and 33min.On the first day of the month, sunrise is at 6:11 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:32 pm PDT.
Sunshine
The average sunshine in September is 10.3h.UV index
In Reardan, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: A maximum high daily UV index of 4 during September translates into the following directions:
Prioritize safety - Recommendations to avert sunburn are shared. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Reardan?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
How many hours of daylight does Reardan have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Reardan have in September?
What is the UV index intensity in September?
Average temperature in September
Reardan, WA
- Average high temperature in September: 72.5°F
The warmest months (with the highest average high temperature) are July and August (83.7°F).
The month with the lowest average high temperature is December (31.5°F).
- Average low temperature in September: 51.1°F
The month with the highest average low temperature is August (59.2°F).
The coldest month (with the lowest average low temperature) is December (22.1°F).
Average pressure in September
Reardan, WA
- 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 (29.9"Hg).
Average wind speed in September
Reardan, WA
- Average wind speed in September: 6.2mph
The windiest months (with the highest average wind speed) are March and April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in September
Reardan, WA
- Average humidity in September: 47%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (38%).
Average rainfall in September
Reardan, WA
- Average rainfall in September: 0.59"
The wettest months (with the highest rainfall) are January and December (1.93").
The driest month (with the least rainfall) is August (0.28").
Average rainfall days in September
Reardan, WA
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is April (14.8 days).
The month with the least rainy days is July (4.6 days).
Average snowfall in September
Reardan, WA
- Average snowfall in September: 0.31"
The month with the highest snowfall is January (10.08").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Reardan, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (15.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Reardan, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in September
Reardan, WA
- Average sunshine days in September: 21.2 days
The month with the most sunshine days is July (24.5 days).
The month with the least sunshine days is March (11.1 days).
Average UV index in September
Reardan, WA
- 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 November and December (UV index 1).
Average cloud cover in September
Reardan, WA
- Average cloud cover in September: 20
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Reardan, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).
Reardan, Washington, USA
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