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
Dayton's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's 81.1°F (27.3°C) to a still moderately hot 73.4°F (23°C). Dayton records a consistent low-temperature average of 50.5°F (10.3°C) during September, indicating a significant difference from the daytime heat.Humidity
In Dayton, the average relative humidity in September is 72%.Rainfall
In September, the rain falls for 10.6 days. Throughout September, 1.42" (36mm) of precipitation is accumulated. Throughout the year, there are 172.2 rainfall days, and 28.9" (734mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Dayton, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:35 am and sunset at 7:48 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:53 pm PDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The maximum UV index, 4 during September, leads to the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Dayton have in September?
What is the UV index intensity in September?
Average temperature in September
Dayton, OR
- Average high temperature in September: 73.4°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 (44.1°F).
- Average low temperature in September: 50.5°F
The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (34.3°F).
Average pressure in September
Dayton, 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
Dayton, OR
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is March (5.2mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in September
Dayton, OR
- Average humidity in September: 72%
The months with the highest relative humidity are February and December (87%).
The month with the lowest relative humidity is August (67%).
Average rainfall in September
Dayton, OR
- Average rainfall in September: 1.42"
The wettest month (with the highest rainfall) is December (4.49").
The driest months (with the least rainfall) are July and August (0.35").
Average rainfall days in September
Dayton, OR
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is March (19.8 days).
The month with the least rainy days is August (4.6 days).
Average snowfall in September
Dayton, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.38").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Dayton, 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 April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Dayton, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 9h and 1min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 54min).
Average sunshine days in September
Dayton, OR
- Average sunshine days in September: 17.7 days
The month with the most sunshine days is July (24.2 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in September
Dayton, 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
Dayton, OR
- Average cloud cover in September: 34
The month with the most cloud cover is February (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 23).
Average visibility in September
Dayton, OR
- Average visibility in September: 6mi
The months with the highest visibility are July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
Dayton, Oregon, USA
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