September weather forecast
Campbell, CA

Share
The long roads in the crowded city of Campbell, California
The long roads in the crowded city of Campbell, California

Weather in September

The first month of the autumn, September, is still a warm month in Campbell, California, with an average temperature fluctuating between 78.4°F (25.8°C) and 55.6°F (13.1°C).

Temperature

As August transitions into September, the average high-temperature rests at a still warm 78.4°F (25.8°C), maintaining a close resemblance to the previous month. From the heights of the September heat, Campbell records a mean nighttime low of 55.6°F (13.1°C).

Humidity

July and September, with an average relative humidity of 62%, are the least humid months.

Rainfall

In Campbell, in September, it is raining for 2.5 days, with typically 0.12" (3mm) of accumulated precipitation. In Campbell, during the entire year, the rain falls for 68.6 days and collects up to 11.57" (294mm) of precipitation.

Daylight

In Campbell, California, the average length of the day in September is 12h and 24min.
On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

Sunshine

In September, the average sunshine is 11.1h.

UV index

In September, the average daily maximum UV index in Campbell is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.
Note: In September, the maximum UV index of 5 suggests this advice:
Undertake precautions - Guarding against sun damage is counselled. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.

Frequently asked questions

What is the temperature in September in Campbell?

During September, Campbell experiences an average high-temperature of 78.4°F (25.8°C) and a low-temperature of 55.6°F (13.1°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines air temperature and relative humidity, in July is appraised at 82.4°F (28°C).

What are the least humid months in Campbell?

July and September, with an average relative humidity of 62%, are the least humid months.

What is the average humidity in September in Campbell?

The average relative humidity in September in Campbell is 62%.

How much does it rain in Campbell in September?

In September, the rain falls for 2.5 days. Throughout September, 0.12" (3mm) of precipitation is accumulated.

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

In Campbell, the average day length in September is 12h and 24min.

When is the sunrise / sunset in September in Campbell?

On the first day of September, sunrise is at 6:39 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:03 am and sunset at 6:51 pm PDT.

How many hours of sunshine does Campbell have in September?

The average sunshine duration in September is 11.1h.

What is the UV index reading in September in Campbell?

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's 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
Campbell, CA

Average temperature in September - Campbell, CA
  • Average high temperature in September: 78.4°F

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is December (56.7°F).

  • Average low temperature in September: 55.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is February (43.5°F).

Average pressure in September
Campbell, CA

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

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

Average wind speed in September
Campbell, CA

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

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest months (with the lowest average wind speed) are August, September, October and November (4.5mph).

Average humidity in September
Campbell, CA

Average humidity in September - Campbell, CA
  • Average humidity in September: 62%

The month with the highest relative humidity is March (74%).
The months with the lowest relative humidity are July and September (62%).

Average rainfall in September
Campbell, CA

Average rainfall in September - Campbell, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is February (2.2").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in September
Campbell, CA

Average rainfall days in September - Campbell, CA
  • Average rainfall days in September: 2.5 days

The month with the highest number of rainy days is March (12.5 days).
The month with the least rainy days is August (0.9 days).

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

Average daylight in September / Average sunshine in September - Campbell, 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 1min

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).

Average sunshine days in September
Campbell, CA

Average sunshine days in September - Campbell, CA
  • Average sunshine days in September: 26.4 days

The month with the most sunshine days is August (29.2 days).
The month with the least sunshine days is March (17.3 days).

Average UV index in September
Campbell, CA

Average UV index in September - Campbell, 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).

Average cloud cover in September
Campbell, CA

Average cloud cover in September - Campbell, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).

Average visibility in September
Campbell, CA

Average visibility in September - Campbell, 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).

Campbell, California, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location