September weather forecast
Belmont, CA

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Weather in September

The first month of the autumn, September, is still a pleasant month in Belmont, California, with temperature in the range of an average low of 56.7°F (13.7°C) and an average high of 72.9°F (22.7°C).

Temperature

September records an average high-temperature of a still pleasant 72.9°F (22.7°C), indicating a minor variation from the preceding month. In Belmont, September's nights observe an average temperature dip to a moderate 56.7°F (13.7°C).

Humidity

In September, the average relative humidity in Belmont is 69%.

Rainfall

In September, the rain falls for 2.8 days. Throughout September, 0.16" (4mm) of precipitation is accumulated. Throughout the year, there are 77.5 rainfall days, and 11.22" (285mm) of precipitation is accumulated.

Daylight

The average length of the day in September in Belmont, California, is 12h and 25min.
On the first day of September, sunrise is at 6:40 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:53 pm PDT.

Sunshine

In Belmont, the average sunshine in September is 11h.

UV index

The months with the highest UV index in Belmont are June through September, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: A typical high UV index of 5 in September suggests the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
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Frequently asked questions

What is the temperature in September in Belmont?

September temperatures in Belmont, California, vary between a high-temperature of 72.9°F (22.7°C) and a low-temperature of 56.7°F (13.7°C).

What is the average humidity in September in Belmont?

In September, the average relative humidity in Belmont, California, is 69%.

How many days does it rain in September in Belmont?

In Belmont, California, in September, it is raining for 2.8 days, with typically 0.16" (4mm) of accumulated precipitation.

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

In September, the average day length in Belmont is 12h and 25min.

When is the sunrise / sunset in September in Belmont?

On the first day of September in Belmont, sunrise is at 6:40 am and sunset at 7:37 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:53 pm PDT.

How many hours of sunshine does Belmont have in September?

The average sunshine duration in September in Belmont, California, is 11h.

What is the month with the highest UV index in Belmont?

June through September, with an average maximum UV index of 5, are months with the highest UV index.

What is the UV index intensity in September in Belmont?

In September, the average daily maximum UV index in Belmont, California, is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Belmont, CA

Average temperature in September - Belmont, CA
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is August (73°F).
The month with the lowest average high temperature is December (55.9°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is September (56.7°F).
The coldest month (with the lowest average low temperature) is January (46°F).

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Average pressure in September
Belmont, CA

Average pressure in September - Belmont, CA
  • Average pressure in September: 29.92"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

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Average wind speed in September
Belmont, CA

Average wind speed in September - Belmont, CA
  • Average wind speed in September: 5.6mph

The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is October (5.5mph).

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Average humidity in September
Belmont, CA

Average humidity in September - Belmont, CA
  • Average humidity in September: 69%

The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is October (68%).

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Average rainfall in September
Belmont, CA

Average rainfall in September - Belmont, CA
  • Average rainfall in September: 0.16"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in September
Belmont, CA

Average rainfall days in September - Belmont, CA
  • Average rainfall days in September: 2.8 days

The month with the highest number of rainy days is March (13 days).
The month with the least rainy days is July (1.8 days).

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

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

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 11h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in September
Belmont, CA

Average sunshine days in September - Belmont, CA
  • Average sunshine days in September: 23.9 days

The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (16.3 days).

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Average UV index in September
Belmont, CA

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

The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in September
Belmont, CA

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

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in September
Belmont, CA

Average visibility in September - Belmont, 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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Belmont, California, USA

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