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
September's advent denotes a minor fluctuation in the average high-temperature to a still moderately hot 82.4°F (28°C) from August's 85.8°F (29.9°C). Asti, amidst the high September temperatures, experiences a substantial shift to an average nighttime low of 52.7°F (11.5°C).Heat index
In September, the heat index is computed to be 84.2°F (29°C). Exposure and extended activity could potentially cause a state of fatigue and lead to heat cramps.The metrics for the heat index are tailored for both shady environments and light winds. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. The impact of temperature is individual, as people's perception of weather may change based on their body mass, height, and physical activity. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for babies and toddlers. Kids often lack the knowledge about the necessity to take breaks and consume liquids. Thirst, as a late symptom of dehydration, necessitates the maintenance of hydration, particularly during enduring physical activities.
Humidity
The months with the lowest humidity in Asti, California, are July and September, with an average relative humidity of 57%.Rainfall
In Asti, in September, it is raining for 2.2 days, with typically 0.16" (4mm) of accumulated precipitation. Throughout the year, there are 82.4 rainfall days, and 20.75" (527mm) of precipitation is accumulated.Snowfall
In Asti, snow does not fall in January, March through December.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:41 am and sunset at 7:41 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 6:55 pm PDT.
Sunshine
In September, the average sunshine is 10.9h.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 rays for the ordinary person.Note: In September, a regular UV index of 5 translates into these guidelines:
Take necessary precautions - Protection from skin and eye injury is mandatory. Direct Sun exposure should be minimized especially during midday when radiation is most intense. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
How hot does it get in Asti in September?
What are the least humid months in Asti?
What is the average humidity in September in Asti?
How many days does it rain in September in Asti?
When it does not snow in Asti?
How many hours of daylight does Asti have in September?
When is the sunrise / sunset in September in Asti?
How long on average sun shines in September in Asti?
What is the UV index intensity in September in Asti?
Average temperature in September
Asti, CA
- Average high temperature in September: 82.4°F
The warmest month (with the highest average high temperature) is July (86.2°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in September: 52.7°F
The month with the highest average low temperature is August (54.1°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).
Average pressure in September
Asti, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in September
Asti, CA
- Average wind speed in September: 4.8mph
The windiest month (with the highest average wind speed) is May (6.3mph).
The calmest month (with the lowest average wind speed) is November (4.6mph).
Average humidity in September
Asti, CA
- Average humidity in September: 57%
The month with the highest relative humidity is March (77%).
The months with the lowest relative humidity are July and September (57%).
Average rainfall in September
Asti, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (4.25").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Asti, CA
- Average rainfall days in September: 2.2 days
The month with the highest number of rainy days is March (14.6 days).
The months with the least rainy days are July and August (1.2 days).
Average snowfall in September
Asti, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.16").
The months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").
Average snowfall days in September
Asti, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.2 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Asti, 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: 10h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).
Average sunshine days in September
Asti, CA
- Average sunshine days in September: 27.3 days
The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (15.2 days).
Average UV index in September
Asti, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in September
Asti, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 6).
Average visibility in September
Asti, 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).
Asti, California, USA
Weather forecast for your location
2. Allow the app to use your location
