September weather forecast and climate
Granite Bay, CA

Weather in September

The first month of the autumn, September, is also a hot month in Granite Bay, California, with average temperature varying between 86.9°F (30.5°C) and 58.1°F (14.5°C).

Temperature

In Granite Bay, the average high-temperature is relatively the same as in August - a still tropical 86.9°F (30.5°C). The average low-temperature, in September, is 58.1°F (14.5°C).

Heat index

In September, the average heat index is appraised at a tropical 86.7°F (30.4°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. 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 'felt air temperature', 'feels like', 'real feel', or 'apparent temperature', is a measure of how hot it feels when the actual air humidity is factored in. Additional factors like activity, clothing, differences in body mass, height, and shape, and metabolic differences affect individual temperature impact. Be aware that direct exposure to sunlight increases heat impact, and may raise the heat index additionally, 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

The average relative humidity in September is 41%.

Rainfall

In Granite Bay, California, during September, the rain falls for 2.6 days and regularly aggregates up to 0.24" (6mm) of precipitation. Throughout the year, in Granite Bay, there are 81.2 rainfall days, and 22.64" (575mm) of precipitation is accumulated.

Snowfall

In Granite Bay snow does not fall in January, March through November.

Daylight

In Granite Bay, California, the average length of the day is 12.4h.

Sunshine

In Granite Bay, the average sunshine in September is 11.3h.

UV index

The average daily maximum UV index in Granite Bay is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Granite Bay?

In Granite Bay, California, in September, the average high-temperature is 86.9°F (30.5°C), and the average low-temperature is 58.1°F (14.5°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), that calculates temperature value influenced by the moisture in the air, in September is calculated to 86.7°F (30.4°C).

What is the average humidity in September in Granite Bay?

In September, the average relative humidity in Granite Bay is 41%.

How much does it rain in Granite Bay in September?

In Granite Bay, in September, it is raining for 2.6 days, with typically 0.24" (6mm) of accumulated precipitation.

When it does not snow in Granite Bay?

In Granite Bay, California, snow does not fall in January, March through November.

What is the average length of the day in September in Granite Bay?

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

How many hours of sunshine does Granite Bay have in September?

The average sunshine in September is 11.3h.

What is the UV index intensity in September in Granite Bay?

The average daily maximum UV index in September in Granite Bay is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.

Average temperature in September
Granite Bay, CA

Average temperature in September - Granite Bay, CA
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is July (93°F).
The month with the lowest average high temperature is December (54°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (60.3°F).
The coldest month (with the lowest average low temperature) is December (39.6°F).

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Average pressure in September
Granite Bay, CA

Average pressure in September - Granite Bay, CA
  • Average pressure in September: 29.92"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in September
Granite Bay, CA

Average wind speed in September - Granite Bay, CA
  • Average wind speed in September: 4mph

The windiest month (with the highest average wind speed) is February (5.5mph).
The calmest months (with the lowest average wind speed) are August and September (4mph).

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Average humidity in September
Granite Bay, CA

Average humidity in September - Granite Bay, CA
  • Average humidity in September: 41%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).

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Average rainfall in September
Granite Bay, CA

Average rainfall in September - Granite Bay, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is March (4.33").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Granite Bay, CA

Average rainfall days in September - Granite Bay, CA
  • Average rainfall days in September: 2.6 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is July (1 days).

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Average snowfall in September
Granite Bay, CA

Average snowfall in September - Granite Bay, CA
  • Average snowfall in September: 0"

Months with the highest snowfall are February and December (0.04").
Months with the least snowfall are January, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in September
Granite Bay, CA

Average snowfall days in September - Granite Bay, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is December (0.2 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Granite Bay, CA

Average daylight in September / Average sunshine in September - Granite Bay, 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: 11.3h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in September
Granite Bay, CA

Average sunshine days in September - Granite Bay, CA
  • Average sunshine days in September: 26.6 days

The month with the most sunshine days is July (29.2 days).
The month with the least sunshine days is March (15.7 days).

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Average UV index in September
Granite Bay, CA

Average UV index in September - Granite Bay, 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).

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Average cloud cover in September
Granite Bay, CA

Average cloud cover in September - Granite Bay, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Granite Bay, CA

Average visibility in September - Granite Bay, 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).

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