September weather forecast
Callahan, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Callahan, California, with an average temperature ranging between max 76.1°F (24.5°C) and min 45.7°F (7.6°C).

Temperature

The arrival of September corresponds with a light shift in temperature, down from 83.8°F (28.8°C) in August to a still moderately hot 76.1°F (24.5°C). Callahan reports a substantial plunge from daytime highs during the nights of September, with an average low-temperature of 45.7°F (7.6°C).

Humidity

The average relative humidity in September is 50%.

Rainfall

In Callahan, California, during September, the rain falls for 4.9 days and regularly aggregates up to 0.51" (13mm) of precipitation. In Callahan, during the entire year, the rain falls for 107.9 days and collects up to 24.76" (629mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. September is the first month it typically snows in Callahan. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Callahan, during the entire year, snow falls for 47.5 days and aggregates up to 57.4" (1458mm) of snow.

Daylight

The average length of the day in September in Callahan is 12h and 27min.
On the first day of the month, sunrise is at 6:38 am and sunset at 7:43 pm. On the last day of September, in Callahan, California, sunrise is at 7:07 am and sunset at 6:54 pm PDT.

Sunshine

In September, the average sunshine is 11h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
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Frequently asked questions

What is the temperature in September in Callahan?

The average high-temperature, in September, in Callahan, is 76.1°F (24.5°C), while the average low-temperature is 45.7°F (7.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines relative humidity and air temperature, in August is computed to be 84.2°F (29°C).

What is the average humidity in September in Callahan?

In September, the average relative humidity in Callahan is 50%.

How many days does it rain in September in Callahan?

In September, in Callahan, the rain falls for 4.9 days. Throughout September, 0.51" (13mm) of precipitation is accumulated.

When does it start to snow in Callahan?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.08" (2mm) of snow.

How many hours of daylight does Callahan have in September?

In Callahan, the average day length in September is 12h and 27min.

When are sunrise and sunset in September in Callahan?

In September, on the first day of the month, sunrise is at 6:38 am and sunset at 7:43 pm. On the last day of the month, in Callahan, California, sunrise is at 7:07 am and sunset at 6:54 pm PDT.

How long on average sun shines in September in Callahan?

In September, the average sunshine duration in Callahan, California, is 11h.

How high is the UV index in September in Callahan?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
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
Callahan, CA

Average temperature in September - Callahan, CA
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (84.6°F).
The month with the lowest average high temperature is December (41°F).

  • Average low temperature in September: 45.7°F

The month with the highest average low temperature is July (51.1°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).

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Average pressure in September
Callahan, CA

Average pressure in September - Callahan, CA
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.94"Hg).

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Average wind speed in September
Callahan, CA

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

The windiest month (with the highest average wind speed) is March (5.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

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Average humidity in September
Callahan, CA

Average humidity in September - Callahan, CA
  • Average humidity in September: 50%

The month with the highest relative humidity is March (81%).
The month with the lowest relative humidity is August (45%).

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Average rainfall in September
Callahan, CA

Average rainfall in September - Callahan, CA
  • Average rainfall in September: 0.51"

The wettest month (with the highest rainfall) is March (4.17").
The driest months (with the least rainfall) are July and August (0.31").

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Average rainfall days in September
Callahan, CA

Average rainfall days in September - Callahan, CA
  • Average rainfall days in September: 4.9 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (3.1 days).

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Average snowfall in September
Callahan, CA

Average snowfall in September - Callahan, CA
  • Average snowfall in September: 0.08"

The month with the highest snowfall is March (14.02").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Callahan, CA

Average snowfall days in September - Callahan, CA
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is March (11.2 days).
The 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
Callahan, CA

Average daylight in September / Average sunshine in September - Callahan, CA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 11h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 24min).

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Average sunshine days in September
Callahan, CA

Average sunshine days in September - Callahan, CA
  • Average sunshine days in September: 23.4 days

The month with the most sunshine days is August (24.1 days).
The month with the least sunshine days is March (10.9 days).

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Average UV index in September
Callahan, CA

Average UV index in September - Callahan, CA
  • Average UV index in September: 4

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

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Average cloud cover in September
Callahan, CA

Average cloud cover in September - Callahan, CA
  • Average cloud cover in September: 12

The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Callahan, CA

Average visibility in September - Callahan, CA
  • Average visibility in September: 6mi

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

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Callahan, California, USA

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