September weather forecastSacramento, CA
September
Weather in September
As September makes its appearance in Sacramento, it brings the first hints of fall with it. However, the summer heat lingers with the average high temperature seeing a moderate decline. Rainfall also sees a minuscule increase, doubling to 0.12" (3mm) from the preceding month. Grape harvest season begins in September, which lures many to the region's wineries. Sacramento's classic cars events leverage the decent outdoor conditions, providing entertainment for both participants and spectators.Temperature
The start of September marks an average high-temperature of a still hot 89.1°F (31.7°C), hardly distinguishable from the conditions in August. In September, a remarkable difference from daytime highs is noted, as Sacramento records an average temperature of 59.4°F (15.2°C) during the night.Heat index
During September, the heat index is computed to be a hot 91.4°F (33°C). Apply extra caution, heat cramps and heat exhaustion could happen. Heatstroke might occur with long-duration activity.Metrics for the heat index primarily focus on shaded spots and light wind conditions. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'felt air temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Being aware that direct sunlight can impact the felt heat might mean an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young individuals usually face greater risks than adults as their sweat production is less. Also, their larger skin surface relative to their small bodies and the high heat generation due to their activity contributes to their vulnerability.
Humidity
September is the least humid month, with an average relative humidity of 45%.Rainfall
In September, in Sacramento, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. Throughout the year, in Sacramento, there are 66.6 rainfall days, and 7.6" (193mm) of precipitation is accumulated.Daylight
The average length of the day in September is 12h and 25min.On the first day of September in Sacramento, sunrise is at 6:35 am and sunset at 7:35 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:49 pm PDT.
Sunshine
The average sunshine in September in Sacramento is 11.2h.UV index
In September, the average daily maximum UV index in Sacramento is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: The maximum daily UV index of 5 in September interprets into the following recommendations:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Boost your sun resistance with garments that are densely woven yet spacious.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sacramento, CA
- Average high temperature in September: 89.1°F
The warmest month (with the highest average high temperature) is July (94.6°F).
The month with the lowest average high temperature is December (54.5°F).
- Average low temperature in September: 59.4°F
The month with the highest average low temperature is August (59.5°F).
The coldest month (with the lowest average low temperature) is December (41.4°F).
Average pressure in September
Sacramento, CA
- Average pressure in September: 29.92"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Sacramento, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is February (6.3mph).
The calmest months (with the lowest average wind speed) are September and November (5mph).
Average humidity in September
Sacramento, CA
- Average humidity in September: 45%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (45%).
Average rainfall in September
Sacramento, CA
- Average rainfall in September: 0.12"
The wettest month (with the highest rainfall) is March (1.34").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in September
Sacramento, CA
- Average rainfall days in September: 1.9 days
The month with the highest number of rainy days is March (12.4 days).
The month with the least rainy days is August (1.2 days).
Average daylight in September /
Average sunshine in September
Sacramento, CA
- Average daylight in September: 12h and 24min
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 30min).
- Average sunshine in September: 11h and 12min
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 30min).
Average sunshine days in September
Sacramento, CA
- Average sunshine days in September: 27.8 days
The month with the most sunshine days is July (29.4 days).
The month with the least sunshine days is March (17.7 days).
Average UV index in September
Sacramento, CA
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Sacramento, CA
- Average cloud cover in September: 9
The month with the most cloud cover is March (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in September
Sacramento, 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).
