September in wine country, the Russia River Valley in Sonoma County
September weather in Wine Country
September is sometimes referred to as the “Indian Summer” month. No fog greets the morning and all day sunshine is the norm. There can be some heat spike days when temperatures reach over 100 degrees but those are few. Temperatures are normally in the mid 80’s during the afternoons. Mornings and evenings are much cooler.
Use this weather widget to get a forecast for the days you plan on visiting the wine country. Click on the weather widget to enter your wine country destination town.
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Video showing all the seasons that occur in wine country