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
Redmond, Washington, records a mild change in average high-temperature during September, easing from a warm 76.3°F (24.6°C) in August to an agreeable 69.3°F (20.7°C). During September, the temperature tends to dip to an average of 49.1°F (9.5°C) at night.Humidity
The average relative humidity in September is 75%.Rainfall
In Redmond, in September, it is raining for 11.4 days, with typically 1.57" (40mm) of accumulated precipitation. In Redmond, during the entire year, the rain falls for 174 days and collects up to 29.69" (754mm) of precipitation.Snowfall
In Redmond, Washington, snow does not fall in April through October.Daylight
In September, the average length of the day in Redmond is 12h and 33min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:48 pm. On the last day of September, sunrise is at 7:07 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September is 9.4h.UV index
The average daily maximum UV index in September in Redmond is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, an average UV index of 3 transforms into the following instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Frequently asked questions
What are the temperatures in Redmond in September?
What is the average humidity in September in Redmond?
How many days does it rain in September in Redmond?
When it does not snow in Redmond?
What is the average length of the day in September in Redmond?
When is the sunrise / sunset in September in Redmond?
How many hours of sunshine does Redmond have in September?
What is the UV index intensity in September in Redmond?
Average temperature in September
Redmond, WA
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (42.1°F).
- Average low temperature in September: 49.1°F
The month with the highest average low temperature is August (52.5°F).
The coldest month (with the lowest average low temperature) is December (34°F).
Average pressure in September
Redmond, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in September
Redmond, WA
- Average wind speed in September: 3.7mph
The windiest months (with the highest average wind speed) are January and March (5mph).
The calmest months (with the lowest average wind speed) are July and August (3.4mph).
Average humidity in September
Redmond, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (70%).
Average rainfall in September
Redmond, WA
- Average rainfall in September: 1.57"
The wettest month (with the highest rainfall) is December (4.37").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Redmond, WA
- Average rainfall days in September: 11.4 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in September
Redmond, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.05").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Redmond, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Redmond, 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: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Redmond, WA
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is August (23.3 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in September
Redmond, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Redmond, WA
- Average cloud cover in September: 34
The months with the most cloud cover are January and December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Redmond, WA
- Average visibility in September: 6mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).
Redmond, Washington, USA
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