September weather forecast and climate
Sacramento, CA

The State Capitol Building in Sacramento, California
The State Capitol Building in Sacramento, California
The first month of the autumn, September, is still a tropical month in Sacramento, California, with average temperature fluctuating between 59.4°F (15.2°C) and 89.1°F (31.7°C).

Temperature

In Sacramento, California, the average high-temperature in September is almost the same as in August - a still tropical 89.1°F (31.7°C). In Sacramento, the average low-temperature is 59.4°F (15.2°C).

Heat index

In September, the average heat index is evaluated at a hot 91°F (32.8°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'real feel', 'felt air temperature', or 'apparent temperature', combines air temperature and relative humidity to represent a human perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (pregnancy, differences in body mass, height, and shape, clothing), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

With an average relative humidity of 45%, September is the least humid month.

Rainfall

In September, the rain falls for 1.9 days. Throughout September, 0.12" (3mm) of precipitation is accumulated. In Sacramento, during the entire year, the rain falls for 66.6 days and collects up to 7.6" (193mm) of precipitation.

Daylight

The average length of the day in September is 12.4h.

Sunshine

In September, the average sunshine is 11.2h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in September in Sacramento?

The average high-temperature, in September, in Sacramento, California, is 89.1°F (31.7°C), while the average low-temperature is 59.4°F (15.2°C). In September, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), that combines air temperature and relative humidity, is evaluated at 91°F (32.8°C).

What is the least humid month in Sacramento?

The least humid month in Sacramento is September, with an average relative humidity of 45%.

What is the average humidity in September in Sacramento?

In September, the average relative humidity is 45%.

How many days does it rain in September in Sacramento?

In Sacramento, in September, during 1.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

What is the average length of the day in September in Sacramento?

In September, the average length of the day in Sacramento, California, is 12.4h.

How long on average sun shines in September in Sacramento?

The average sunshine in September in Sacramento is 11.2h.

How high is the UV index in September in Sacramento?

The average daily maximum UV index in September in Sacramento, California, is 5. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.
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"

The month with the highest atmospheric pressure is January (30.15").
The month with the lowest atmospheric pressure is June (29.9").

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: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.2h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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

Months with the highest UV index are June and July (UV index 7).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).