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 notes an average high-temperature of a still hot 86.9°F (30.5°C) in September, hardly diverging from August. September nights experience a distinct temperature drop from the daily highs, with an average low-temperature of 57.9°F (14.4°C).Heat index
For September, the heat index is evaluated at a hot 87.8°F (31°C). Unrelenting activity during exposure could cause fatigue and potentially lead to heat cramps.For clarity, heat index numbers account for light winds and areas under shade. If directly exposed to the sun, the heat index could rise by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', embodies the combination of air temperature and moisture content to illustrate perceived heat. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Young kids are often more at risk than adults as they tend to perspire less. Besides, their skin surface is larger relative to their small bodies, and their increased heat output from their active lifestyle compounds their risk.
Humidity
In Ione, the average relative humidity in September is 42%.Rainfall
In Ione, in September, during 2.6 rainfall days, 0.2" (5mm) of precipitation is typically accumulated. Throughout the year, there are 75.1 rainfall days, and 19.06" (484mm) of precipitation is accumulated.Snowfall
In Ione, snow does not fall in January through November.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:33 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:47 pm PDT.
Sunshine
In Ione, California, the average sunshine in September is 11.4h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: A daily maximum UV index of 5 in September translates into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Is it hot during September?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How many hours of sunshine does Ione have in September?
How high is the UV index in September?
Average temperature in September
Ione, CA
- Average high temperature in September: 86.9°F
The warmest month (with the highest average high temperature) is July (92.8°F).
The month with the lowest average high temperature is December (54°F).
- Average low temperature in September: 57.9°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is December (38.8°F).
Average pressure in September
Ione, CA
- Average pressure in September: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Ione, CA
- Average wind speed in September: 3.9mph
The windiest month (with the highest average wind speed) is February (5.6mph).
The calmest months (with the lowest average wind speed) are August and September (3.9mph).
Average humidity in September
Ione, CA
- Average humidity in September: 42%
The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).
Average rainfall in September
Ione, CA
- Average rainfall in September: 0.2"
The wettest month (with the highest rainfall) is March (3.7").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Ione, CA
- Average rainfall days in September: 2.6 days
The month with the highest number of rainy days is March (13.8 days).
The month with the least rainy days is August (1.2 days).
Average snowfall in September
Ione, CA
- Average snowfall in September: 0"
The month with the highest snowfall is December (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Ione, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (0.2 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Ione, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 11h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in September
Ione, CA
- Average sunshine days in September: 26.5 days
The months with the most sunshine days are July and August (28.8 days).
The month with the least sunshine days is March (16.3 days).
Average UV index in September
Ione, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Ione, CA
- Average cloud cover in September: 7
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Ione, CA
- 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).
Ione, California, USA
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