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 Diamond Lake, entering September brings a subtle temperature decrement, reducing from August's moderately hot 76.5°F (24.7°C) to a pleasant 68.4°F (20.2°C). Diamond Lake, in September, displays a significant temperature downturn during the night, with an average reading of 41.9°F (5.5°C).Humidity
In September, the average relative humidity is 63%.Rainfall
In Diamond Lake, in September, during 7.3 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. Throughout the year, in Diamond Lake, there are 105.2 rainfall days, and 35.83" (910mm) of precipitation is accumulated.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 1.7 snowfall days, it receives 1.65" (42mm) of snow. Throughout the year, there are 133.8 snowfall days, and 206.73" (5251mm) of snow is accumulated.Daylight
In September, the average length of the day in Diamond Lake is 12h and 29min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:42 pm. On the last day of September, sunrise is at 7:05 am and sunset at 6:50 pm PDT.
Sunshine
The average sunshine in September in Diamond Lake is 10.4h.UV index
In Diamond Lake, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: In September, the UV index of 3 transforms into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Frequently asked questions
What are the temperatures in Diamond Lake in September?
What is the average humidity in September in Diamond Lake?
How many days does it rain in September in Diamond Lake?
When does it start snowing in Diamond Lake?
What is the average length of the day in September in Diamond Lake?
When are sunrise and sunset in September in Diamond Lake?
How long on average sun shines in September in Diamond Lake?
What is the UV index reading in September in Diamond Lake?
Average temperature in September
Diamond Lake, OR
- Average high temperature in September: 68.4°F
The warmest months (with the highest average high temperature) are July and August (76.5°F).
The month with the lowest average high temperature is December (35.4°F).
- Average low temperature in September: 41.9°F
The month with the highest average low temperature is August (46.4°F).
The coldest month (with the lowest average low temperature) is December (23.5°F).
Average pressure in September
Diamond Lake, OR
- Average pressure in September: 30"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.98"Hg).
Average wind speed in September
Diamond Lake, OR
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is January (6mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in September
Diamond Lake, OR
- Average humidity in September: 63%
The months with the highest relative humidity are February and March (88%).
The months with the lowest relative humidity are July and August (59%).
Average rainfall in September
Diamond Lake, OR
- Average rainfall in September: 1.18"
The wettest month (with the highest rainfall) is January (5.55").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Diamond Lake, OR
- Average rainfall days in September: 7.3 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is July (4.6 days).
Average snowfall in September
Diamond Lake, OR
- Average snowfall in September: 1.65"
The months with the highest snowfall are January and December (39.21").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Diamond Lake, OR
- Average snowfall days in September: 1.7 days
The month with the highest number of snowfall days is March (21.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Diamond Lake, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 4h and 30min).
Average sunshine days in September
Diamond Lake, OR
- Average sunshine days in September: 19.7 days
The month with the most sunshine days is July (23.6 days).
The month with the least sunshine days is March (7.4 days).
Average UV index in September
Diamond Lake, OR
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Diamond Lake, OR
- Average cloud cover in September: 25
The month with the most cloud cover is March (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Diamond Lake, 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, March, April, November and December (4mi).
Diamond Lake, Oregon, USA
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