September weather forecastStanford, CA
September
Weather in September
September, the first month of the autumn in Stanford, is also a moderately hot month, with temperature in the range of an average high of 76.5°F (24.7°C) and an average low of 56.7°F (13.7°C).Temperature
Stanford, California, ushers in September with an average high-temperature of a still moderately hot 76.5°F (24.7°C), showing a close resemblance to the previous month. Stanford experiences an average low-temperature of 56.7°F (13.7°C) in the month of September.Humidity
The months with the lowest humidity in Stanford are September and October, with an average relative humidity of 65%.Rainfall
In Stanford, during September, the rain falls for 2.1 days and regularly aggregates up to 0.08" (2mm) of precipitation. Throughout the year, in Stanford, California, there are 63.3 rainfall days, and 9.53" (242mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September, sunrise is at 6:39 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:52 pm PDT.
Sunshine
The average sunshine in September is 11h.UV index
April through October, with an average maximum UV index of 5, are months with the highest UV index. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: A maximum daily UV index of 5 during September morphs into the following directions:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Stanford, CA
- Average high temperature in September: 76.5°F
The warmest months (with the highest average high temperature) are July and August (77.5°F).
The month with the lowest average high temperature is December (56.3°F).
- Average low temperature in September: 56.7°F
The month with the highest average low temperature is August (57°F).
The coldest months (with the lowest average low temperature) are January and February (45.1°F).
Average pressure in September
Stanford, 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 and September (29.92"Hg).
Average wind speed in September
Stanford, CA
- Average wind speed in September: 4.9mph
The windiest months (with the highest average wind speed) are April and May (6.5mph).
The calmest months (with the lowest average wind speed) are September and October (4.9mph).
Average humidity in September
Stanford, CA
- Average humidity in September: 65%
The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are September and October (65%).
Average rainfall in September
Stanford, CA
- Average rainfall in September: 0.08"
The wettest month (with the highest rainfall) is February (2.01").
The driest month (with the least rainfall) is July (0").
Average rainfall days in September
Stanford, CA
- Average rainfall days in September: 2.1 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.6 days).
Average daylight in September /
Average sunshine in September
Stanford, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 11h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 54min).
Average sunshine days in September
Stanford, CA
- Average sunshine days in September: 27.6 days
The month with the most sunshine days is July (30.2 days).
The month with the least sunshine days is March (18 days).
Average UV index in September
Stanford, CA
- Average UV index in September: 5
The months with the highest UV index are April, May, June, July, August, September and October (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Stanford, CA
- Average cloud cover in September: 11
The months with the most cloud cover are March and December (Cloud cover 34).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in September
Stanford, 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).
