Sacramento
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Sacramento, CA

The State Capitol Building in Sacramento, California, under the perfect blue sky
The State Capitol Building in Sacramento, California, under the perfect blue sky
The first month of the autumn, September, is still a tropical month in Sacramento, California, with average temperature varying between 87.3°F (30.7°C) and 55.8°F (13.2°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still hot 87.3°F (30.7°C). In September, the average low-temperature is 55.8°F (13.2°C).

Heat index

The average heat index in September is evaluated at a hot 92.3°F (33.5°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is a measure that combines both air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like activity, clothing, pregnancy, and metabolic differences affect individual temperature impact. 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 particularly important for children. 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

In Sacramento, the average relative humidity in September is 57%.

Rainfall

In September, in Sacramento, the rain falls for 1.3 days. Throughout September, 0.3" (7.4mm) of precipitation is accumulated. In Sacramento, California, during the entire year, the rain falls for 60.1 days and collects up to 18.5" (470.5mm) of precipitation.

Daylight

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

Sunshine

In September, the average sunshine in Sacramento, California, is 11.6h.

UV index

In Sacramento, California, the average daily maximum UV index is 7. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in Sacramento?

In September, in Sacramento, the average high-temperature is 87.3°F (30.7°C), and the average low-temperature is 55.8°F (13.2°C). In September, the average heat index (a.k.a. 'real feel', 'feels like'), that factores the actual air temperature with the relative humidity, is appraised at 92.3°F (33.5°C).

What is the average humidity in September in Sacramento?

The average relative humidity in September in Sacramento, California, is 57%.

How many days does it rain in September in Sacramento?

In September, in Sacramento, California, the rain falls for 1.3 days. Throughout September, 0.3" (7.4mm) of precipitation is accumulated.

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

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

How long on average sun shines in September in Sacramento?

The average sunshine in September in Sacramento, California, is 11.6h.

How high is the UV index in September in Sacramento?

In September, the average daily maximum UV index in Sacramento is 7. A UV Index estimate of 6 to 7 represents a high health risk from the exposure to the Sun's UV radiation.
Average temperature in September - Sacramento, CA
  • Average high temperature in September: 30.7°C

The warmest month (with the highest average high temperature) is July (33.4°C).
The month with the lowest average high temperature is January (12.1°C).

  • Average low temperature in September: 13.2°C

The month with the highest average low temperature is July (14.7°C).
The coldest month (with the lowest average low temperature) is December (3.6°C).

Average humidity in September - Sacramento, CA
  • Average humidity in September: 57%

The month with the highest relative humidity is January (83.3%).
The month with the lowest relative humidity is July (53.2%).

Average rainfall in September - Sacramento, CA
  • Average rainfall in September: 7.4mm

The wettest month (with the highest rainfall) is January (92.5mm).
The driest month (with the lowest rainfall) is July (0mm).

Average rainfall days in September - Sacramento, CA
  • Average rainfall days in September: 1.3 days

The month with the highest number of rainy days is January (10.3 days).
The month with the lowest number of rainy days is July (0 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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11.6h

The month with most sunshine is July (Average sunshine: 14.2h).
The month with least sunshine is December (Average sunshine: 4.6h).

Average UV index in September - Sacramento, CA
  • Average UV index in September: 7

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).