Pollen Forecast for South San Francisco, California

Pollen concentrations for Wednesday will be increasing but will still remain in the low range. This rise is a result of rising temperatures.

Based on past pollen counts and expected weather conditions, pollen levels for Thursday will be falling into the extremely low range. The cause for the falling pollen levels is rising humidity, weak winds and expected precipitation in the morning and evening which tends to wash pollen out of the air.