AccuWeather forecast: Cool end to summer

A trough to the north will initiate a cooling trend today with a deeper marine layer this morning. Temps will cool 5 to 10 degrees today over Sunday's highs. In fact light winds with comfortable temperatures will be the rule for much of the week. Today is the last day of summer but breezy afternoon winds will help improve air quality as we get closer to fall, which arrives tomorrow.

VIDEO: Meteorologist Lisa Argen has your AccuWeather forecast

LIVE: Track Bay Area air quality levels

The Autumnal Equinox is when there is about an equal length daylight and darkness around September 22. This year, autumn arrives at 6:30 tomorrow morning.

By the end of the week, more drying winds are expected out of the north northeast. It's too early to tell how strong this offshore event will be until it gets closer, but it looks like we'll have to say goodbye to our fall-like temperatures and get the shorts back out as temperatures are expected to climb.

Today's highs
Santa Rosa 85
Concord 86
San Francisco 69
Oakland 74
San Jose 79

A foggy start,then Sunny.
Highs: 66-69.
Tonight: Becoming cloudy.
Lows in the mid-50s.

East Bay:
A cloudy start, then sunny & cooler.
Highs:in the mid-70s.
Tonight: Cloudy skies.
Lows: In the upper 50s.

East Bay Valleys:
Becoming sunny.
Highs in the mid to upper 80s.
Tonight: Cloudy skies.
Lows: In the mid 50s.

North Bay:
Morning fog,then sunny & cooler.
Highs: 81-85.
Tonight: Cloudy skies.
Lows: 54-58.

Morning fog,
then sunny & cooler.
Highs: 74-77.
Tonight: fog returns.
Lows in the mid-50s.

South Bay:
Sunny & cooler.
Highs: In the upper 70s.
Tonight: Cloudy skies.
Lows: 54-58

Morning clouds, then sunny.
Hello Fall!
Highs: 64-84.

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