September weather forecastDaly City, CA
September
Weather in September
September brings a subtle shift in weather as the summer season starts to make way for Fall. Yet, it withstands the retreat of summer with temperatures reaching a high point at 69.1°F (20.6°C). This situation makes it, surprisingly, the warmest month of the year. The rainfall remains minimal, at around 0.16" (4mm), allowing more outdoor time for the residents. Despite the decreased daylight hours to 12.4 hours, September can still charm one's senses, further enhancing their outdoor experience.Temperature
During the warmest month, September, temperatures average a high of 69.1°F (20.6°C) and a low of 56.5°F (13.6°C).Humidity
In September, the average relative humidity is 74%.Rainfall
In Daly City, California, in September, it is raining for 3 days, with typically 0.16" (4mm) of accumulated precipitation. Throughout the year, there are 82.2 rainfall days, and 13.62" (346mm) of precipitation is accumulated.Daylight
In September, the average length of the day is 12h and 25min.On the first day of September in Daly City, sunrise is at 6:40 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:53 pm PDT.
Sunshine
In Daly City, the average sunshine in September is 10.7h.UV index
The months with the highest UV index are June through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 5 transforms into the following instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Daly City, CA
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is September (69.1°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is September (56.5°F).
The coldest month (with the lowest average low temperature) is February (47.7°F).
Average pressure in September
Daly City, 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 August and September (29.92"Hg).
Average wind speed in September
Daly City, CA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (8.6mph).
The calmest month (with the lowest average wind speed) is September (6.3mph).
Average humidity in September
Daly City, CA
- Average humidity in September: 74%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Daly City, CA
- Average rainfall in September: 0.16"
The wettest month (with the highest rainfall) is February (2.8").
The driest months (with the least rainfall) are July and August (0.08").
Average rainfall days in September
Daly City, CA
- Average rainfall days in September: 3 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.7 days).
Average daylight in September /
Average sunshine in September
Daly City, 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: 10h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in September
Daly City, CA
- Average sunshine days in September: 23.7 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (16.6 days).
Average UV index in September
Daly City, CA
- Average UV index in September: 5
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).
Average cloud cover in September
Daly City, CA
- Average cloud cover in September: 18
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is September (Cloud cover 18).
Average visibility in September
Daly City, 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).
