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
In Vallecito, the average high-temperature in September gently drops from a tropical 90.9°F (32.7°C) in August to a moderately hot 85.3°F (29.6°C). During September, the nighttime temperature presents a clear descent from the daily peaks, falling to an average of 58.8°F (14.9°C).Humidity
In September, the average relative humidity in Vallecito is 36%.Rainfall
In Vallecito, California, during September, the rain falls for 3 days and regularly aggregates up to 0.24" (6mm) of precipitation. Throughout the year, there are 74.4 rainfall days, and 22.87" (581mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Vallecito.Daylight
In September, the average length of the day in Vallecito is 12h and 25min.On the first day of the month, sunrise is at 6:32 am and sunset at 7:30 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm PDT.
Sunshine
In September, the average sunshine is 11.3h.UV index
In Vallecito, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: A daily high UV index of 5 in September leads to these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. Stay safe from the Sun's strongest UV rays by limiting exposure during midday. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Frequently asked questions
Is it hot in Vallecito during September?
What is the average humidity in September in Vallecito?
How many days does it rain in September in Vallecito?
When it does not snow in Vallecito?
What is the average length of the day in September in Vallecito?
What time are sunrise and sunset in September in Vallecito?
How long on average sun shines in September in Vallecito?
What is the UV index reading in September in Vallecito?
Average temperature in September
Vallecito, CA
- Average high temperature in September: 85.3°F
The warmest month (with the highest average high temperature) is July (91.9°F).
The month with the lowest average high temperature is December (53.2°F).
- Average low temperature in September: 58.8°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is December (37.8°F).
Average pressure in September
Vallecito, 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
Vallecito, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in September
Vallecito, CA
- Average humidity in September: 36%
The month with the highest relative humidity is March (71%).
The months with the lowest relative humidity are July and August (34%).
Average rainfall in September
Vallecito, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is March (4.76").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Vallecito, CA
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is August (1.2 days).
Average snowfall in September
Vallecito, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.32").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Vallecito, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Vallecito, 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 36min).
- Average sunshine in September: 11h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).
Average sunshine days in September
Vallecito, CA
- Average sunshine days in September: 26.8 days
The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (16.8 days).
Average UV index in September
Vallecito, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in September
Vallecito, CA
- Average cloud cover in September: 7
The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in September
Vallecito, 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).
Vallecito, California, USA
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