September weather forecastJamieson, OR
September
Weather in September
September, the first month of the autumn in Jamieson, is still a warm month, with an average temperature varying between 55.9°F (13.3°C) and 78.4°F (25.8°C).Temperature
Jamieson's average high-temperature decreases in September, falling from a tropical 89.4°F (31.9°C) in August to a warm 78.4°F (25.8°C). Despite higher daytime temperatures, nighttime averages fall to a moderate 55.9°F (13.3°C) in September.Humidity
The average relative humidity in September is 35%.Rainfall
In Jamieson, in September, it is raining for 2.8 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, in Jamieson, there are 57 rainfall days, and 2.99" (76mm) of precipitation is accumulated.Snowfall
In Jamieson, snow does not fall in May through October.Daylight
In Jamieson, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 7:13 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 7:47 am and sunset at 7:31 pm MDT.
Sunshine
In Jamieson, the average sunshine in September is 9.6h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 5 in September translates into these instructions:
Be vigilant - A duty to shield skin and eyes from injury exists. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Jamieson, OR
- Average high temperature in September: 78.4°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (34.3°F).
- Average low temperature in September: 55.9°F
The month with the highest average low temperature is August (63.5°F).
The coldest months (with the lowest average low temperature) are January and December (22.1°F).
Average pressure in September
Jamieson, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
Jamieson, OR
- Average wind speed in September: 5.8mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (3.9mph).
Average humidity in September
Jamieson, OR
- Average humidity in September: 35%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (28%).
Average rainfall in September
Jamieson, OR
- Average rainfall in September: 0.12"
The wettest months (with the highest rainfall) are March and May (0.39").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Jamieson, OR
- Average rainfall days in September: 2.8 days
The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is August (2.3 days).
Average snowfall in September
Jamieson, OR
- Average snowfall in September: 0"
The month with the highest snowfall is December (1.77").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Jamieson, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (6.1 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
Jamieson, 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 36min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).
Average sunshine days in September
Jamieson, OR
- Average sunshine days in September: 26.5 days
The month with the most sunshine days is July (26.8 days).
The month with the least sunshine days is March (20.1 days).
Average UV index in September
Jamieson, OR
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Jamieson, OR
- Average cloud cover in September: 14
The months with the most cloud cover are January and December (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 8).
Average visibility in September
Jamieson, OR
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
