September weather forecast
Sierra Heights, CA

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Weather in September

September, the first month of the autumn in Sierra Heights, is still a hot month, with an average temperature ranging between max 88.3°F (31.3°C) and min 63.9°F (17.7°C).

Temperature

At the onset of September, Sierra Heights records an average high-temperature of a still tropical 88.3°F (31.3°C), showing little deviation from the preceding month. A significant drop from the day's peak to an average low-temperature of 63.9°F (17.7°C) is noted during the nights in September.

Heat index

For most parts of September, the heat index is computed to be a hot 89.6°F (32°C). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.
Be advised, the heat index considers values for conditions in shade and with a light breeze. The heat index values could be amplified by up to 15 Fahrenheit (8 Celsius) degrees in direct sunlight.
Note: The heat index, also known as 'feels like' or 'felt air temperature', is an indicator that blends the effects of temperature and humidity to depict perceived warmth. The influence of weather is personal, differing among individuals based on variations in body mass, stature, and the degree of physical exertion. Being under direct sunshine can magnify the heat experience, possibly pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Young individuals are typically more threatened than adults due to their reduced perspiration. Also, the larger skin surface proportionate to their small bodies and the increased heat from their activities magnify their risk.

Humidity

In Sierra Heights, the average relative humidity in September is 42%.

Rainfall

In Sierra Heights, in September, it is raining for 2.4 days, with typically 0.12" (3mm) of accumulated precipitation. Throughout the year, there are 48.1 rainfall days, and 6.89" (175mm) of precipitation is accumulated.

Snowfall

In Sierra Heights, snow does not fall in January, March through December.

Daylight

In September, the average length of the day is 12h and 22min.
On the first day of September, sunrise is at 6:23 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:34 pm PDT.

Sunshine

In September, the average sunshine is 10.7h.

UV index

In Sierra Heights, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: In September, a regular UV index of 6 translates into these guidelines:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
Updated: Jun 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How hot is it in September?

In September, in Sierra Heights, the average high-temperature is 88.3°F (31.3°C), and the average low-temperature is 63.9°F (17.7°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is computed to be 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 42%.

How much does it rain in September?

In September, the rain falls for 2.4 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

When it does not snow?

In Sierra Heights, snow does not fall in January, March through December.

How many hours of daylight does Sierra Heights have in September?

In September, the average day length is 12h and 22min.

When is the sunrise / sunset in September?

In September, on the first day of the month, sunrise is at 6:23 am and sunset at 7:15 pm. On the last day of the month, in Sierra Heights, California, sunrise is at 6:44 am and sunset at 6:34 pm PDT.

How long on average sun shines in September?

The average sunshine duration in September is 10.7h.

What is the UV index reading in September?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Sierra Heights, CA

Average temperature in September - Sierra Heights, CA
  • Average high temperature in September: 88.3°F

The warmest month (with the highest average high temperature) is August (92.1°F).
The month with the lowest average high temperature is December (60.8°F).

  • Average low temperature in September: 63.9°F

The month with the highest average low temperature is August (67.3°F).
The coldest months (with the lowest average low temperature) are February and December (44.2°F).

Average pressure in September
Sierra Heights, CA

Average pressure in September - Sierra Heights, CA
  • Average pressure in September: 29.87"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).

Average wind speed in September
Sierra Heights, CA

Average wind speed in September - Sierra Heights, CA
  • Average wind speed in September: 4.5mph

The windiest months (with the highest average wind speed) are April and May (6mph).
The calmest month (with the lowest average wind speed) is September (4.5mph).

Average humidity in September
Sierra Heights, CA

Average humidity in September - Sierra Heights, CA
  • Average humidity in September: 42%

The months with the highest relative humidity are February, March and May (52%).
The month with the lowest relative humidity is August (39%).

Average rainfall in September
Sierra Heights, CA

Average rainfall in September - Sierra Heights, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (1.57").
The driest month (with the least rainfall) is June (0.04").

Average rainfall days in September
Sierra Heights, CA

Average rainfall days in September - Sierra Heights, CA
  • Average rainfall days in September: 2.4 days

The month with the highest number of rainy days is March (7.5 days).
The month with the least rainy days is June (1.2 days).

Average snowfall days in September
Sierra Heights, CA

Average snowfall days in September - Sierra Heights, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

Average daylight in September /
Average sunshine in September
Sierra Heights, CA

Average daylight in September / Average sunshine in September - Sierra Heights, CA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are June, July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 54min).

Average sunshine days in September
Sierra Heights, CA

Average sunshine days in September - Sierra Heights, CA
  • Average sunshine days in September: 25.9 days

The month with the most sunshine days is June (28.3 days).
The month with the least sunshine days is February (21.1 days).

Average UV index in September
Sierra Heights, CA

Average UV index in September - Sierra Heights, CA
  • Average UV index in September: 6

The months with the highest UV index are July and August (UV index 7).
The month with the lowest UV index is December (UV index 3).

Average cloud cover in September
Sierra Heights, CA

Average cloud cover in September - Sierra Heights, CA
  • Average cloud cover in September: 6

The months with the most cloud cover are February, March and December (Cloud cover 21).
The month with the least cloud cover is August (Cloud cover 4).

Average visibility in September
Sierra Heights, CA

Average visibility in September - Sierra Heights, 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).

Sierra Heights, California, USA

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