September weather forecastDallas, OR
September
Weather in September
September marks the transition from summer to autumn in Dallas, Oregon. The dropping temperature, ranging from 49.3°F (9.6°C) to 72.7°F (22.6°C), is complemented by continuing dry conditions with only 0.79" (20mm) of rainfall. The expanses of vineyards and wine harvests are a sight to behold in September, making it a great time to visit the Oregon Wine Country.Temperature
With the commencement of September, Dallas records a moderate temperature decline, with the average high easing from August's moderately hot 80.2°F (26.8°C) to a pleasant 72.7°F (22.6°C). Dallas, after hot September days, encounters a marked drop to an average nighttime temperature of 49.3°F (9.6°C).Humidity
In September, the average relative humidity is 74%.Rainfall
In Dallas, in September, it is raining for 8.8 days, with typically 0.79" (20mm) of accumulated precipitation. In Dallas, during the entire year, the rain falls for 139.9 days and collects up to 15.39" (391mm) of precipitation.Snowfall
April through October are months without snowfall.Daylight
The average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 6:36 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 6:54 pm PDT.
Sunshine
In September, the average sunshine is 9.1h.UV index
In Dallas, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, a daily UV index of 4 turns into the following recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Dallas, OR
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (80.2°F).
The month with the lowest average high temperature is December (44.2°F).
- Average low temperature in September: 49.3°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 (34°F).
Average pressure in September
Dallas, OR
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are August and September (30.01"Hg).
Average wind speed in September
Dallas, OR
- Average wind speed in September: 4mph
The windiest month (with the highest average wind speed) is March (5mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).
Average humidity in September
Dallas, OR
- Average humidity in September: 74%
The month with the highest relative humidity is December (89%).
The month with the lowest relative humidity is August (69%).
Average rainfall in September
Dallas, OR
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is December (2.4").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Dallas, OR
- Average rainfall days in September: 8.8 days
The month with the highest number of rainy days is March (17.4 days).
The month with the least rainy days is August (3.9 days).
Average snowfall in September
Dallas, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.18").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Dallas, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.5 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
Dallas, 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 48min).
- Average sunshine in September: 9h and 6min
The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 3h and 42min).
Average sunshine days in September
Dallas, OR
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is July (26.1 days).
The month with the least sunshine days is March (11.6 days).
Average UV index in September
Dallas, OR
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Dallas, OR
- Average cloud cover in September: 35
The month with the most cloud cover is February (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Dallas, OR
- Average visibility in September: 5mi
The months with the highest visibility are May, June, July, August, September and October (5mi).
The months with the lowest visibility are January, February, March, April, November and December (4mi).
