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
As Ione enters September, the average high-temperature decreases from the a moderately hot 76.8°F (24.9°C) of August to a comfortable 66°F (18.9°C). Ione, in the heat of September, registers a significant plunge to a mean of 39.4°F (4.1°C) during the nights.Humidity
The average relative humidity in September is 65%.Rainfall
In Ione, during September, the rain falls for 11.1 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, 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 September, the average length of the day 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, Washington, is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum daily UV index of 3 in September converts into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How many days does it rain in September in Ione?
When does it start snowing?
How many hours of daylight does Ione have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
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
Weather forecast for your location
2. Allow the app to use your location