September weather forecast
Volcano, CA

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Weather in September

September, the first month of the autumn in Volcano, is also a moderately hot month, with temperature in the range of an average low of 57°F (13.9°C) and an average high of 85.1°F (29.5°C).

Temperature

Volcano registers an average high-temperature of a moderately hot 85.1°F (29.5°C) at the commencement of September, closely related to the preceding month. Significant dips from daytime highs mark the September nights in Volcano, California, with a consistent average temperature of 57°F (13.9°C).

Heat index

The heat index in September is estimated at 84.2°F (29°C). With prolonged exposure and constant activity, one might feel exhausted and experience heat cramps.
It is important to note that the heat index values are for shaded areas and light wind scenarios. Direct sunlight exposure may result in a rise of the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. Additional factors encompassing metabolic differences, the level of physical activity, and clothing can impact the individual's perception of temperature. Given the impact of direct sunlight, it's noteworthy that the felt temperature can rise by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly meaningful for babies and toddlers. Kids generally face higher risks than adults as they sweat less. Along with their large skin surface compared to their small bodies and higher heat production due to their activities, their vulnerability is increased.

Humidity

The average relative humidity in September in Volcano is 42%.

Rainfall

In Volcano, in September, it is raining for 3 days, with typically 0.24" (6mm) of accumulated precipitation. In Volcano, during the entire year, the rain falls for 81.8 days and collects up to 23.39" (594mm) of precipitation.

Snowfall

January, April through October are months without snowfall in Volcano.

Daylight

In Volcano, the average length of the day in September is 12h and 25min.
On the first day of the month, sunrise is at 6:32 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:46 pm PDT.

Sunshine

The average sunshine in September is 11.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A daily maximum UV index of 5 in September translates into the following instructions:
Be mindful. Individuals with a lighter skin tone may suffer burns in less than 30 minutes. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

How hot does it get in Volcano in September?

The high-temperature, in September, in Volcano, records 85.1°F (29.5°C), while the low-temperature is 57°F (13.9°C). In September, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 84.2°F (29°C).

What is the average humidity in September in Volcano?

In Volcano, California, the average relative humidity in September is 42%.

How much does it rain in Volcano in September?

In September, in Volcano, California, the rain falls for 3 days. Throughout September, 0.24" (6mm) of precipitation is accumulated.

When it does not snow in Volcano?

January, April through October are months without snowfall in Volcano, California.

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

The average day length in September in Volcano, California, is 12h and 25min.

When is the sunrise / sunset in September in Volcano?

In September, on the first day of the month, sunrise is at 6:32 am and sunset at 7:31 pm. On the last day of the month, in Volcano, sunrise is at 6:58 am and sunset at 6:46 pm PDT.

How many hours of sunshine does Volcano have in September?

In Volcano, the average sunshine duration in September is 11.3h.

How high is the UV index in September in Volcano?

The average daily maximum UV index in September in Volcano, California, is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Volcano, CA

Average temperature in September - Volcano, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).

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Average pressure in September
Volcano, CA

Average pressure in September - Volcano, CA
  • Average pressure in September: 29.93"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in September
Volcano, CA

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

The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

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Average humidity in September
Volcano, CA

Average humidity in September - Volcano, CA
  • Average humidity in September: 42%

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
Volcano, CA

Average rainfall in September - Volcano, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is March (4.69").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in September
Volcano, CA

Average rainfall days in September - Volcano, CA
  • Average rainfall days in September: 3 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (1.5 days).

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Average snowfall in September
Volcano, CA

Average snowfall in September - Volcano, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are January, April, May, June, July, August, September and October (0").

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Average snowfall days in September
Volcano, CA

Average snowfall days in September - Volcano, CA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Volcano, CA

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

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 2min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in September
Volcano, CA

Average sunshine days in September - Volcano, CA
  • Average sunshine days in September: 26.5 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (15.1 days).

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Average UV index in September
Volcano, CA

Average UV index in September - Volcano, CA
  • Average UV index in September: 5

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in September
Volcano, CA

Average cloud cover in September - Volcano, CA
  • Average cloud cover in September: 8

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in September
Volcano, CA

Average visibility in September - Volcano, 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).

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Volcano, California, USA

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