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 Helix, entering September brings a temperature decrement, reducing from August's hot 86.2°F (30.1°C) to a moderately hot 75.7°F (24.3°C). During September, the nighttime temperature averages to a mild 56.3°F (13.5°C).Humidity
In Helix, the average relative humidity in September is 44%.Rainfall
In Helix, in September, during 6.4 rainfall days, 0.35" (9mm) of precipitation is typically accumulated. Throughout the year, in Helix, Oregon, there are 125.2 rainfall days, and 11.26" (286mm) of precipitation is accumulated.Snowfall
January through April, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 19.8 snowfall days, and 10.16" (258mm) of snow is accumulated.Daylight
The average length of the day in September in Helix is 12h and 31min.On the first day of the month, sunrise is at 6:16 am and sunset at 7:32 pm. On the last day of September, sunrise is at 6:52 am and sunset at 6:35 pm PDT.
Sunshine
The average sunshine in September in Helix is 10.6h.UV index
In Helix, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Helix in September?
What is the average humidity in September?
How many days does it rain in September in Helix?
When does it start snowing?
How many hours of daylight does Helix have in September?
When is the sunrise / sunset in September?
How long on average sun shines in September in Helix?
What is the UV index reading in September?
Average temperature in September
Helix, OR
- Average high temperature in September: 75.7°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure in September
Helix, OR
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Helix, OR
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (6.2mph).
Average humidity in September
Helix, OR
- Average humidity in September: 44%
The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are July and August (37%).
Average rainfall in September
Helix, OR
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is December (1.5").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Helix, OR
- Average rainfall days in September: 6.4 days
The month with the highest number of rainy days is March (15.9 days).
The month with the least rainy days is August (3.7 days).
Average snowfall in September
Helix, OR
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (3.74").
The months with the least snowfall are May, June, July, August and October (0").
Average snowfall days in September
Helix, OR
- Average snowfall days in September: 0.1 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 and October (0 days).
Average daylight in September /
Average sunshine in September
Helix, OR
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is August (Average sunshine: 12h and 6min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).
Average sunshine days in September
Helix, OR
- Average sunshine days in September: 22.2 days
The month with the most sunshine days is July (25.1 days).
The month with the least sunshine days is February (12.4 days).
Average UV index in September
Helix, OR
- Average UV index in September: 4
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
Helix, OR
- Average cloud cover in September: 16
The month with the most cloud cover is December (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in September
Helix, OR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Helix, Oregon, USA
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