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
The transition from August to September brings an average high-temperature of a still tropical 86.9°F (30.5°C), barely different from August's 91.9°F (33.3°C). September nights in Ione present a sharp contrast to daytime highs, with average temperatures of 57.9°F (14.4°C).Heat index
The heat index in September is estimated at a hot 87.8°F (31°C). Persisting in activity during exposure could lead to weariness and subsequently to heat cramps.Always consider that heat index estimations are for light winds and places in the shade. Exposure to unobstructed sunshine could lead to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', marries air temperature and humidity to produce a value illustrating perceived warmth. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Children frequently do not comprehend the need for rest and hydration. Thirst is an advanced stage of dehydration - staying hydrated, especially during extended physical exercises, is essential.
Humidity
The average relative humidity in September in Ione is 42%.Rainfall
In Ione, during September, the rain falls for 2.6 days and regularly aggregates up to 0.2" (5mm) of precipitation. In Ione, California, during the entire year, the rain falls for 75.1 days and collects up to 19.06" (484mm) of precipitation.Snowfall
January through November are months without snowfall.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 September, the average sunshine is 11.4h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index, 5 in September, converts into the following recommendations:
Guard yourself - Avoiding sunburn is suggested. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Frequently asked questions
How hot is September in Ione?
What is the average humidity in September in Ione?
How much does it rain in Ione in September?
When it does not snow in Ione?
How many hours of daylight does Ione have in September?
When is the sunrise / sunset in September in Ione?
How long on average sun shines in September in Ione?
What is the UV index reading in September in Ione?
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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