September weather forecastChiriaco Summit, CA
September
Weather in September
September, the first month of the autumn in Chiriaco Summit, is also a hot month, with temperature in the range of an average low of 72°F (22.2°C) and an average high of 88.7°F (31.5°C).Temperature
As September arrives, Chiriaco Summit's weather displays a minor decrease in high-temperatures, transitioning from August's hot 94.6°F (34.8°C) to a still tropical 88.7°F (31.5°C). In Chiriaco Summit, an average temperature of 72°F (22.2°C) is noted during September nights.Humidity
In September, the average relative humidity in Chiriaco Summit is 33%.Rainfall
In Chiriaco Summit, during September, the rain falls for 5 days and regularly aggregates up to 0.31" (8mm) of precipitation. In Chiriaco Summit, during the entire year, the rain falls for 46.2 days and collects up to 4.09" (104mm) of precipitation.Daylight
In September, the average length of the day is 12h and 22min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:07 pm. On the last day of September, in Chiriaco Summit, sunrise is at 6:37 am and sunset at 6:28 pm PDT.
Sunshine
The average sunshine in September in Chiriaco Summit is 10.4h.UV index
In September, the average daily maximum UV index is 7. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the average person.Note: In September, the maximum UV index of 7 suggests this advice:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Chiriaco Summit, CA
- Average high temperature in September: 88.7°F
The warmest month (with the highest average high temperature) is July (95.4°F).
The month with the lowest average high temperature is December (60.6°F).
- Average low temperature in September: 72°F
The month with the highest average low temperature is August (76.3°F).
The coldest month (with the lowest average low temperature) is December (46.8°F).
Average pressure in September
Chiriaco Summit, CA
- Average pressure in September: 29.83"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.8"Hg).
Average wind speed in September
Chiriaco Summit, CA
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is May (8.2mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity in September
Chiriaco Summit, CA
- Average humidity in September: 33%
The month with the highest relative humidity is December (46%).
The month with the lowest relative humidity is June (29%).
Average rainfall in September
Chiriaco Summit, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is July (0.79").
The driest months (with the least rainfall) are May and June (0.12").
Average rainfall days in September
Chiriaco Summit, CA
- Average rainfall days in September: 5 days
The month with the highest number of rainy days is July (6.9 days).
The month with the least rainy days is June (1.5 days).
Average daylight in September /
Average sunshine in September
Chiriaco Summit, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 24min
The month with the most sunshine is June (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 7h and 6min).
Average sunshine days in September
Chiriaco Summit, CA
- Average sunshine days in September: 23.1 days
The month with the most sunshine days is October (27.4 days).
The month with the least sunshine days is July (19.4 days).
Average UV index in September
Chiriaco Summit, CA
- Average UV index in September: 7
The month with the highest UV index is July (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in September
Chiriaco Summit, CA
- Average cloud cover in September: 6
The month with the most cloud cover is December (Cloud cover 17).
The month with the least cloud cover is June (Cloud cover 4).
Average visibility in September
Chiriaco Summit, 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).
