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
A moderate decline in average high-temperatures is noted in September, moving from a warm 77°F (25°C) in August to an agreeable 70.5°F (21.4°C). East Renton Highlands reports an average low-temperature of 48.9°F (9.4°C) during the nights of September.Humidity
The average relative humidity in September is 74%.Rainfall
In East Renton Highlands, in September, it is raining for 12.5 days, with typically 1.69" (43mm) of accumulated precipitation. In East Renton Highlands, during the entire year, the rain falls for 175.4 days and collects up to 33.9" (861mm) of precipitation.Snowfall
May through October are months without snowfall in East Renton Highlands.Daylight
In East Renton Highlands, Washington, the average length of the day in September is 12h and 32min.On the first day of September in East Renton Highlands, sunrise is at 6:28 am and sunset at 7:47 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:49 pm PDT.
Sunshine
In East Renton Highlands, the average sunshine in September is 9.1h.UV index
In September, the average daily maximum UV index in East Renton Highlands is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 3 during September leads to these advisories:
Ensure safety - Recommendations to avert sunburn are presented. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in East Renton Highlands?
What is the average humidity in September in East Renton Highlands?
How many days does it rain in September in East Renton Highlands?
When it does not snow in East Renton Highlands?
How many hours of daylight does East Renton Highlands have in September?
What time are sunrise and sunset in September in East Renton Highlands?
How long on average sun shines in September in East Renton Highlands?
How high is the UV index in September in East Renton Highlands?
Average temperature in September
East Renton Highlands, WA
- Average high temperature in September: 70.5°F
The warmest month (with the highest average high temperature) is August (77°F).
The month with the lowest average high temperature is December (42.3°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is August (52.3°F).
The coldest month (with the lowest average low temperature) is December (33.4°F).
Average pressure in September
East Renton Highlands, 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
East Renton Highlands, WA
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is January (5mph).
The calmest month (with the lowest average wind speed) is August (3.5mph).
Average humidity in September
East Renton Highlands, WA
- Average humidity in September: 74%
The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
East Renton Highlands, WA
- Average rainfall in September: 1.69"
The wettest month (with the highest rainfall) is December (5.12").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in September
East Renton Highlands, WA
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is March (19.7 days).
The month with the least rainy days is August (6.2 days).
Average snowfall in September
East Renton Highlands, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.62").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
East Renton Highlands, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
East Renton Highlands, 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 1min
The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in September
East Renton Highlands, WA
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is February (8.8 days).
Average UV index in September
East Renton Highlands, WA
- Average UV index in September: 3
The months with the highest UV index are June and 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
East Renton Highlands, WA
- Average cloud cover in September: 36
The months with the most cloud cover are January and December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
East Renton Highlands, WA
- Average visibility in September: 5mi
The months with the highest visibility are July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, June, September, October, November and December (5mi).
East Renton Highlands, Washington, USA
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