September weather forecast and climate
Cotati, CA

Weather in September

September, the first month of the autumn, in Cotati, is also a moderately hot month, with average temperature fluctuating between 79.3°F (26.3°C) and 55°F (12.8°C).

Temperature

In September, the average high-temperature is almost the same as in August - a still moderately hot 79.3°F (26.3°C). The average low-temperature, in Cotati, is 55°F (12.8°C).

Humidity

The least humid month is September, with an average relative humidity of 62%.

Rainfall

Months with the least rainfall are June through September Rain falls for 1.7 days and accumulates 0.04" (1mm) of rain.

Daylight

The average length of the day in Cotati is 12.4h.

Sunshine

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

UV index

In Cotati, California, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 5 transform into the following instructions:
Take precautions - Protection against sun damage is advised. 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.
[Resources]

FAQ

What is the least humid month in Cotati?

With an average relative humidity of 62%, September is the least humid month.

What is the average humidity in September in Cotati?

The average relative humidity in September is 62%.

What is the driest month in Cotati?

June through September are months with the least rain in Cotati, California, when the rain falls for 1.7 days and typically aggregates up to 0.04" (1mm) of rain.

How much does it rain in Cotati in September?

In Cotati, California, in September, during 1.7 rainfall days, 0.04" (1mm) of precipitation is typically accumulated.

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

The average length of the day in September in Cotati, California, is 12.4h.

How long on average sun shines in September in Cotati?

The average sunshine in September in Cotati, California, is 11h.

What is the UV index reading in September in Cotati?

In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Cotati, CA

Average temperature in September - Cotati, CA
  • Average high temperature in September: 79.3°F

The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in September: 55°F

Months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).

[Resources]

Average pressure in September
Cotati, CA

Average pressure in September - Cotati, CA
  • Average pressure in September: 29.92"

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

[Resources]

Average wind speed in September
Cotati, CA

Average wind speed in September - Cotati, CA
  • Average wind speed in September: 5mph

The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).

[Resources]

Average humidity in September
Cotati, CA

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

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).

[Resources]

Average rainfall in September
Cotati, CA

Average rainfall in September - Cotati, CA
  • Average rainfall in September: 0.04"

The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").

[Resources]

Average rainfall days in September
Cotati, CA

Average rainfall days in September - Cotati, CA
  • Average rainfall days in September: 1.7 days

The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).

[Resources]

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

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 11h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.7h).

[Resources]

Average sunshine days in September
Cotati, CA

Average sunshine days in September - Cotati, CA
  • Average sunshine days in September: 27.5 days

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).

[Resources]

Average UV index in September
Cotati, CA

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

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

[Resources]

Average cloud cover in September
Cotati, CA

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

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).

[Resources]

Average visibility in September
Cotati, CA

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

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location