September weather forecastMonroe, OR
September
Weather in September
September, the first month of the autumn in Monroe, is also a moderately hot month, with temperature in the range of an average high of 73.6°F (23.1°C) and an average low of 48.6°F (9.2°C).Temperature
September brings a slight decrease in the average high-temperature, shifting from 81.1°F (27.3°C) in August to a still warm 73.6°F (23.1°C). Nighttime temperatures throughout September register a significant deviation from the day's highs, averaging at a chilly 48.6°F (9.2°C).Humidity
In September, the average relative humidity is 73%.Rainfall
In Monroe, in September, it is raining for 8.5 days, with typically 1.26" (32mm) of accumulated precipitation. In Monroe, during the entire year, the rain falls for 161.8 days and collects up to 28.82" (732mm) of precipitation.Snowfall
In Monroe, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:37 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:54 pm PDT.
Sunshine
In Monroe, the average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 4 during September translates into the following recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Monroe, OR
- Average high temperature in September: 73.6°F
The warmest month (with the highest average high temperature) is August (81.1°F).
The month with the lowest average high temperature is December (45.7°F).
- Average low temperature in September: 48.6°F
The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in September
Monroe, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Monroe, OR
- Average wind speed in September: 3.8mph
The windiest month (with the highest average wind speed) is March (4.8mph).
The calmest month (with the lowest average wind speed) is September (3.8mph).
Average humidity in September
Monroe, OR
- Average humidity in September: 73%
The months with the highest relative humidity are January, February, March and December (87%).
The month with the lowest relative humidity is August (68%).
Average rainfall in September
Monroe, OR
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is December (4.37").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Monroe, OR
- Average rainfall days in September: 8.5 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (3.6 days).
Average snowfall in September
Monroe, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Monroe, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (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
Monroe, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is August (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 0min).
Average sunshine days in September
Monroe, OR
- Average sunshine days in September: 20.5 days
The month with the most sunshine days is July (26.2 days).
The months with the least sunshine days are February and March (9.4 days).
Average UV index in September
Monroe, OR
- 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
Monroe, OR
- Average cloud cover in September: 32
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 22).
Average visibility in September
Monroe, OR
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March, April and December (4mi).
