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
Ione's transition into September involves a shift in temperature, receding from a moderately hot 76.8°F (24.9°C) in August to a comfortable 66°F (18.9°C). September nights in Ione show a substantial disparity from the daytime peak with an average low-temperature of 39.4°F (4.1°C).Humidity
The average relative humidity in September is 65%.Rainfall
In Ione, Washington, in September, during 11.1 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, in Ione, there are 147.3 rainfall days, and 20.12" (511mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.51" (13mm) of snow. Throughout the year, there are 95.8 snowfall days, and 50.39" (1280mm) of snow is accumulated.Daylight
In Ione, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:48 am and sunset at 6:29 pm PDT.
Sunshine
The average sunshine in September in Ione is 9.9h.UV index
The average daily maximum UV index in September in Ione is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 3 in September translates into the following instructions:
Take necessary precautions - Suggestions to elude sunburn are provided. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What is the average September temperature in Ione?
What is the average humidity in September in Ione?
How many days does it rain in September in Ione?
When does it start snowing in Ione?
How many hours of daylight does Ione have in September?
When are sunrise and sunset in September in Ione?
How long on average sun shines in September in Ione?
What is the UV index intensity in September in Ione?
Average temperature in September
Ione, WA
- Average high temperature in September: 66°F
The warmest month (with the highest average high temperature) is July (77°F).
The month with the lowest average high temperature is December (26.6°F).
- Average low temperature in September: 39.4°F
The month with the highest average low temperature is August (46.6°F).
The coldest month (with the lowest average low temperature) is February (14.4°F).
Average pressure in September
Ione, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Ione, WA
- Average wind speed in September: 3.5mph
The windiest months (with the highest average wind speed) are April, May and June (3.9mph).
The calmest months (with the lowest average wind speed) are January and December (3.2mph).
Average humidity in September
Ione, WA
- Average humidity in September: 65%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (55%).
Average rainfall in September
Ione, WA
- Average rainfall in September: 1.06"
The wettest month (with the highest rainfall) is May (2.52").
The driest month (with the least rainfall) is August (0.59").
Average rainfall days in September
Ione, WA
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is April (18.5 days).
The month with the least rainy days is February (7.8 days).
Average snowfall in September
Ione, WA
- Average snowfall in September: 0.51"
The month with the highest snowfall is January (11.77").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Ione, WA
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (20.7 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Ione, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Ione, WA
- Average sunshine days in September: 16.9 days
The month with the most sunshine days is August (20.2 days).
The month with the least sunshine days is March (7.6 days).
Average UV index in September
Ione, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Ione, WA
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in September
Ione, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Ione, Washington, USA
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