September weather forecastMonitor, WA
September
Weather in September
September, the first month of the autumn in Monitor, is also an agreeable month, with an average temperature varying between 46.4°F (8°C) and 70.7°F (21.5°C).Temperature
September implies a gentle temperature shift, with average high-temperatures reducing from August's warm 82.2°F (27.9°C) to a pleasant 70.7°F (21.5°C). Monitor records a marked divergence from the day's high temperatures, with nights in September averaging at a frosty 46.4°F (8°C).Humidity
In September, the average relative humidity is 58%.Rainfall
In Monitor, Washington, in September, during 6.3 rainfall days, 0.75" (19mm) of precipitation is typically accumulated. Throughout the year, there are 113.5 rainfall days, and 12.32" (313mm) of precipitation is accumulated.Snowfall
In Monitor, snow does not fall in May through October.Daylight
The average length of the day in September in Monitor is 12h and 32min.On the first day of the month, sunrise is at 6:21 am and sunset at 7:41 pm. On the last day of September, in Monitor, sunrise is at 7:00 am and sunset at 6:42 pm PDT.
Sunshine
In Monitor, the average sunshine in September is 10.7h.UV index
The average daily maximum UV index in September in Monitor is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The maximum UV index of 3 during September leads to these instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Monitor, WA
- Average high temperature in September: 70.7°F
The warmest months (with the highest average high temperature) are July and August (82.2°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in September: 46.4°F
The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).
Average pressure in September
Monitor, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).
Average wind speed in September
Monitor, WA
- Average wind speed in September: 4.8mph
The windiest months (with the highest average wind speed) are June and July (5.8mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).
Average humidity in September
Monitor, WA
- Average humidity in September: 58%
The month with the highest relative humidity is January (90%).
The months with the lowest relative humidity are July and August (49%).
Average rainfall in September
Monitor, WA
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is January (2.05").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Monitor, WA
- Average rainfall days in September: 6.3 days
The month with the highest number of rainy days is March (15 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in September
Monitor, WA
- Average snowfall in September: 0"
The month with the highest snowfall is December (4.65").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Monitor, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (7.3 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
Monitor, 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: 10h and 42min
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 24min).
Average sunshine days in September
Monitor, WA
- Average sunshine days in September: 22 days
The month with the most sunshine days is August (26.1 days).
The month with the least sunshine days is March (12.4 days).
Average UV index in September
Monitor, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Monitor, WA
- Average cloud cover in September: 20
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 12).
Average visibility in September
Monitor, 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).
