San Mateo
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
San Mateo, CA

A unique breathtaking view of the scenic spot of the Devil
A unique breathtaking view of the scenic spot of the Devil's Slide Sheer Cliff over the pacific Coast in San Mateo, California, cute flowers and blue sky
September, the first month of the autumn, in San Mateo, is also a moderately hot month, with average temperature fluctuating between 54°F (12.2°C) and 80.1°F (26.7°C).

Temperature

In San Mateo, California, the average high-temperature in September is essentially the same as in August - a still moderately hot 80.1°F (26.7°C). The average low-temperature, in San Mateo, is 54°F (12.2°C).

Daylight

In September, the average length of the day is 12.4h.

What is the temperature in September in San Mateo?

In September, in San Mateo, the average high-temperature is 80.1°F (26.7°C), and the average low-temperature is 54°F (12.2°C).

How many hours of daylight does San Mateo have in September?

The average length of the day in September is 12.4h.
Average temperature in September - San Mateo, CA
  • Average high temperature in September: 80°F

The warmest month (with the highest average high temperature) is July (82°F).
Months with the lowest average high temperature are January and December (58°F).

  • Average low temperature in September: 54°F

Months with the highest average low temperature are July and August (56°F).
Coldest months (with the lowest average low temperature) are January and December (40°F).

Average daylight in September - San Mateo, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.7h).
The month with shortest days is December (Average daylight: 9.6h).