September weather forecast and climate
Fremont, CA US

• Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is August (79°F).
The month with the lowest average high temperature is December (57.8°F).

• Average low temperature in September: 55.5°F

The month with the highest average low temperature is August (56.8°F).
The coldest month (with the lowest average low temperature) is January (42.2°F).

• Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is February (3.2").
Driest months (with the lowest rainfall) are July and August (0").

• Average sea temperature in September: 57.5°F

The best month for swimming (with the highest average sea temperature) is August (57.7°F).
Coldest months (with the lowest average sea temperature) are February and April (53.2°F).

• 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).