September weather forecastSanta Clara, CA
September
Weather in September
September signifies the onset of fall in Santa Clara, with the average temperatures dipping slightly from the summer highs. However, the sun continues to shine generously upon the city, making it a suitable period for outdoor undertakings. This time of year is marked by a decline in daylight hours, signaling the approaching fall. As the seasons shift, the city's beauty is amplified by its colorful foliage and clear blue skies. The weather conditions during September in Santa Clara, California transition seamlessly to usher in the beautiful fall season.Temperature
Santa Clara marks the start of September with an average high-temperature of a still warm 79.2°F (26.2°C), hinting at a slight fluctuation from August's 81.3°F (27.4°C). In Santa Clara, the nighttime temperature registers a significant drop from daytime peaks to an average of 55.6°F (13.1°C) in September.Humidity
July and September, with an average relative humidity of 61%, are the least humid months.Rainfall
In Santa Clara, during September, the rain falls for 2.7 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, there are 70.2 rainfall days, and 9.8" (249mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm PDT.
Sunshine
The average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.Note: During September, 5 as the daily maximum UV index converts into the following advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Santa Clara, CA
- Average high temperature in September: 79.2°F
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is December (56.7°F).
- Average low temperature in September: 55.6°F
The month with the highest average low temperature is August (56.3°F).
The coldest months (with the lowest average low temperature) are January and February (43.3°F).
Average pressure in September
Santa Clara, 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
Santa Clara, CA
- Average wind speed in September: 4.4mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest month (with the lowest average wind speed) is September (4.4mph).
Average humidity in September
Santa Clara, CA
- Average humidity in September: 61%
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (61%).
Average rainfall in September
Santa Clara, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (1.77").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in September
Santa Clara, CA
- Average rainfall days in September: 2.7 days
The month with the highest number of rainy days is March (12.9 days).
The month with the least rainy days is August (0.8 days).
Average daylight in September /
Average sunshine in September
Santa Clara, 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 6min
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
Santa Clara, CA
- Average sunshine days in September: 25.8 days
The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (16.7 days).
Average UV index in September
Santa Clara, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Santa Clara, CA
- Average cloud cover in September: 10
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in September
Santa Clara, 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).
