Sonoma County Airport (STS) Weather 09/30/2025
This Afternoon
84
Mostly Sunny
Tonight
56
Chance Showers and Patchy Fog
Friday
78
Slight Chance Showers and Patchy Fog then Mostly Sunny
Friday Night
55
Mostly Clear then Patchy Fog
Saturday
82
Areas Fog then Sunny
Saturday Night
54
Mostly Clear then Patchy Fog
Sunday
87
Areas Fog then Sunny
Sunday Night
55
Mostly Clear
Monday
92
Sunny
Monday Night
56
Mostly Clear
Tuesday
83
Slight Chance Showers
Tuesday Night
56
Slight Chance Showers then Patchy Fog
Wednesday
80
Patchy Fog then Mostly Sunny
Weekly Forecast
This Afternoon
Mostly sunny, with a high near 84. South southwest wind around 8 mph.
Tonight
A chance of showers and thunderstorms. Patchy fog after 4am. Otherwise, increasing clouds, with a low around 56. South wind around 5 mph becoming calm in the evening. Chance of precipitation is 30%.
Friday
A 20 percent chance of showers before 11am. Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 78. Calm wind becoming south southwest around 6 mph in the afternoon.
Friday Night
Patchy fog after midnight. Otherwise, partly cloudy, with a low around 55. Southwest wind 5 to 9 mph becoming calm in the evening.
Saturday
Areas of fog before 9am. Otherwise, sunny, with a high near 82. Calm wind becoming southwest 5 to 8 mph in the afternoon.
Saturday Night
Patchy fog after 2am. Otherwise, mostly clear, with a low around 54.
Sunday
Areas of fog before 9am. Otherwise, sunny, with a high near 87.
Sunday Night
Mostly clear, with a low around 55.
Monday
Sunny, with a high near 92.
Monday Night
Mostly clear, with a low around 56.
Tuesday
A slight chance of showers. Partly sunny, with a high near 83.
Tuesday Night
A slight chance of showers. Patchy fog. Otherwise, mostly cloudy, with a low around 56.
Wednesday
Patchy fog. Otherwise, partly sunny, with a high near 80.