September weather forecast and climate
Round Mountain, CA

Weather in September

September, the first month of the autumn, in Round Mountain, is also a moderately hot month, with average temperature varying between 48°F (8.9°C) and 78.8°F (26°C).

Temperature

In September, the average high-temperature slightly decreases, from a warm 85.8°F (29.9°C) in August, to a still moderately hot 78.8°F (26°C). In September, in Round Mountain, the average low-temperature is 48°F (8.9°C).

Humidity

In Round Mountain, the average relative humidity in September is 45%.

Rainfall

In September, in Round Mountain, the rain falls for 4.1 days. Throughout September, 0.39" (10mm) of precipitation is accumulated. Throughout the year, in Round Mountain, there are 105 rainfall days, and 24.69" (627mm) of precipitation is accumulated.

Snowfall

In Round Mountain snow does not fall in June through September.

Daylight

In Round Mountain, the average length of the day is 12.4h.

Sunshine

In Round Mountain, California, the average sunshine is 11.1h.

UV index

The average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in September in Round Mountain?

In September, the average relative humidity in Round Mountain is 45%.

How many days does it rain in September in Round Mountain?

In September, in Round Mountain, the rain falls for 4.1 days. Throughout September, 0.39" (10mm) of precipitation is accumulated.

When it does not snow in Round Mountain?

In Round Mountain, California, snow does not fall in June through September.

Does it snow in Round Mountain in September?

In Round Mountain, California, in September, it doesn't snow. In October, it regularly snows.

What is the average length of the day in September in Round Mountain?

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

How many hours of sunshine does Round Mountain have in September?

In September, the average sunshine is 11.1h.

How high is the UV index in September in Round Mountain?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Round Mountain, CA

Average temperature in September - Round Mountain, CA
  • Average high temperature in September: 78.8°F

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is December (43.3°F).

  • Average low temperature in September: 48°F

The month with the highest average low temperature is July (53.1°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).

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Average pressure in September
Round Mountain, CA

Average pressure in September - Round Mountain, CA
  • Average pressure in September: 29.94"

The month with the highest atmospheric pressure is January (30.18").
Months with the lowest atmospheric pressure are June and August (29.92").

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Average wind speed in September
Round Mountain, CA

Average wind speed in September - Round Mountain, CA
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in September
Round Mountain, CA

Average humidity in September - Round Mountain, CA
  • Average humidity in September: 45%

Months with the highest relative humidity are January and March (79%).
Months with the lowest relative humidity are July and August (40%).

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Average rainfall in September
Round Mountain, CA

Average rainfall in September - Round Mountain, CA
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is March (4.45").
The driest month (with the least rainfall) is July (0.16").

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Average rainfall days in September
Round Mountain, CA

Average rainfall days in September - Round Mountain, CA
  • Average rainfall days in September: 4.1 days

The month with the highest number of rainy days is April (14.5 days).
The month with the least rainy days is August (2.3 days).

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Average snowfall in September
Round Mountain, CA

Average snowfall in September - Round Mountain, CA
  • Average snowfall in September: 0"

The month with the highest snowfall is March (10.43").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Round Mountain, CA

Average snowfall days in September - Round Mountain, CA
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is March (8 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Round Mountain, CA

Average daylight in September / Average sunshine in September - Round Mountain, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 11.1h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in September
Round Mountain, CA

Average sunshine days in September - Round Mountain, CA
  • Average sunshine days in September: 24.7 days

The month with the most sunshine days is August (26 days).
The month with the least sunshine days is March (11.3 days).

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Average UV index in September
Round Mountain, CA

Average UV index in September - Round Mountain, CA
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in September
Round Mountain, CA

Average cloud cover in September - Round Mountain, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 42).
Months with the least cloud cover are July and August (Cloud cover 6).

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Average visibility in September
Round Mountain, CA

Average visibility in September - Round Mountain, CA
  • Average visibility in September: 6mi

Months with the highest visibility are February, April, May, June, July, August, September, October and November (6mi).
Months with the lowest visibility are January, March and December (5mi).

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