September weather forecastArtondale, WA
September
Weather in September
September, the first month of the autumn in Artondale, is still a pleasant month, with an average temperature fluctuating between 49.5°F (9.7°C) and 70.9°F (21.6°C).Temperature
The commencement of September indicates a gentle shift in the average high-temperature, receding from August's moderately hot 78.1°F (25.6°C) to an agreeable 70.9°F (21.6°C). During the month of September, Artondale anticipates a mean low-temperature of 49.5°F (9.7°C).Humidity
The average relative humidity in September in Artondale is 75%.Rainfall
In Artondale, in September, it is raining for 11.9 days, with typically 1.54" (39mm) of accumulated precipitation. Throughout the year, there are 172.9 rainfall days, and 30.08" (764mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September in Artondale is 12h and 32min.On the first day of September in Artondale, sunrise is at 6:30 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:51 pm PDT.
Sunshine
In September, the average sunshine is 9h.UV index
In Artondale, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The maximum UV index of 4 during September leads to these instructions:
Put precautions into practice - Protective measures against sun-induced damage are advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Artondale, WA
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is August (78.1°F).
The month with the lowest average high temperature is December (43.7°F).
- Average low temperature in September: 49.5°F
The month with the highest average low temperature is August (52.7°F).
The coldest months (with the lowest average low temperature) are February and December (34.3°F).
Average pressure in September
Artondale, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Artondale, WA
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest month (with the lowest average wind speed) is August (3.7mph).
Average humidity in September
Artondale, WA
- Average humidity in September: 75%
The months with the highest relative humidity are January and December (87%).
The month with the lowest relative humidity is July (68%).
Average rainfall in September
Artondale, WA
- Average rainfall in September: 1.54"
The wettest month (with the highest rainfall) is December (4.69").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Artondale, WA
- Average rainfall days in September: 11.9 days
The month with the highest number of rainy days is March (20.1 days).
The month with the least rainy days is August (5 days).
Average snowfall in September
Artondale, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Artondale, 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
Artondale, WA
- Average daylight in September: 12h and 30min
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 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 4h and 0min).
Average sunshine days in September
Artondale, WA
- Average sunshine days in September: 16.5 days
The month with the most sunshine days is August (23.4 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Artondale, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Artondale, WA
- Average cloud cover in September: 36
The month with the most cloud cover is December (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Artondale, WA
- Average visibility in September: 5mi
The months with the highest visibility are June, July and August (6mi).
The months with the lowest visibility are January, February, March, April, May, September, October, November and December (5mi).
