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
In September, the meteorological conditions alter, with the average high-temperature shifting from a moderately hot 81.3°F (27.4°C) in August to a pleasant 72.1°F (22.3°C). La Grande experiences a substantial divergence from daytime highs in September, with average lows hovering around a frosty 46°F (7.8°C).Humidity
In September, the average relative humidity in La Grande is 52%.Rainfall
In La Grande, Oregon, in September, during 6.5 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. In La Grande, during the entire year, the rain falls for 141.7 days and collects up to 18.43" (468mm) of precipitation.Snowfall
Months with snowfall in La Grande are January through May, September through December. September is the first month it typically snows in La Grande. Throughout September, in the average 0.2 snowfall days, it receives 0.04" (1mm) of snow. In La Grande, during the entire year, snow falls for 56.6 days and aggregates up to 36.85" (936mm) of snow.Daylight
In La Grande, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:29 pm. On the last day of September, in La Grande, sunrise is at 6:50 am and sunset at 6:33 pm PDT.
Sunshine
The average sunshine in September in La Grande is 10.6h.UV index
The average daily maximum UV index in September in La Grande, Oregon, is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for average individuals.Note: In September, a regular UV index of 4 translates into these guidelines:
Take necessary precautions - Defending against sun damage is advocated. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Be informed! The Sun's UV radiation can be nearly doubled due to the reflection from snow.
Frequently asked questions
What is the usual temperature for La Grande in September?
What is the average humidity in September in La Grande?
How much does it rain in La Grande in September?
When does it start snowing in La Grande?
What is the average length of the day in September in La Grande?
When is the sunrise / sunset in September in La Grande?
How many hours of sunshine does La Grande have in September?
What is the UV index reading in September in La Grande?
Average temperature in September
La Grande, OR
- Average high temperature in September: 72.1°F
The warmest month (with the highest average high temperature) is August (81.3°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in September: 46°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 (20.5°F).
Average pressure in September
La Grande, OR
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
La Grande, OR
- Average wind speed in September: 4.6mph
The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).
Average humidity in September
La Grande, OR
- Average humidity in September: 52%
The months with the highest relative humidity are January and February (86%).
The month with the lowest relative humidity is August (45%).
Average rainfall in September
La Grande, OR
- Average rainfall in September: 0.67"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is July (0.35").
Average rainfall days in September
La Grande, OR
- Average rainfall days in September: 6.5 days
The month with the highest number of rainy days is March (17.3 days).
The month with the least rainy days is August (4.8 days).
Average snowfall in September
La Grande, OR
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (10.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
La Grande, OR
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (13.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
La Grande, 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: 10h and 4min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 5h and 6min).
Average sunshine days in September
La Grande, OR
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is July (23.4 days).
The month with the least sunshine days is February (9.1 days).
Average UV index in September
La Grande, 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, March, April, November and December (UV index 2).
Average cloud cover in September
La Grande, OR
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in September
La Grande, 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).
La Grande, Oregon, USA
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