A modest low pressure system from the Northwest brought a rare event to parts of the Bay Area Tuesday — rain in September. It wasn’t much, but in enough, particularly in the North Bay and some hills and peaks along the coast, to help clear the air and bring down wildfire risk for a few days.

September is typically one of the driest months of the year in the Bay Area, with a monthly average of just .10 inches and an average of only 1.2 days of rain for the month in San Francisco.

Rain totals for Tuesday’s weather (24 hours ending at 1 pm, in inches):

Calistoga – .51

Yountville – .43

Olema Valley (Marin) – .34

Mt. Tamalpais – .32

Allen Peak (near La Honda) – .27

Bonny Doon (Santa Cruz County) – .18

Mt. Madonna (near Gilroy) – .12

Santa Rosa – .12

Skyline Boulevard (Oakland Hills)

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