Mill Valley, CA Weather Tomorrow

Everything you need for tomorrow's Mill Valley weather and the next 5 days is here, including precipitation potential, daytime and nighttime forecasts, temperature highs and lows in Fahrenheit and Celsius, sunrise and sunset times, cloud cover, wind chill, wind speed, and wind direction for the Mill Valley area and around Marin county, California.
Updated: Mon Sep 28th 2026 10:00 PM PDT
Mill Valley, CA Weather – 9-28 – Sunny
69° / 53°
Sunny
Mill Valley is set for sunshine with temperatures peaking at 69°F and dipping to 53°F. There's a very small chance of rainfall, only about 7%. Wind will be moderate, blowing around 12mph on average and gusts of 7mph at 11 PM. The humidity will be on the higher side, averaging about 75%, the maximum being 79% at 11 PM and 79% being its lowest at 11 PM. Barometric pressure is its highest of 29.84inHg at 11 PM, a lowest point of 29.84inHg at 11 PM with an avg 29.84inHg.
Mill Valley, CA Weather – 9-29 – Sunny
74° / 59°

Weather Tomorrow

Sunny
Mill Valley could see sunshine with daytime highs of 74°F and nighttime lows near 59°F. There's a very small chance of rainfall, only about 5%. Wind will be moderate, blowing around 11mph on average and gusts of 12.4mph at 4 PM. The humidity will be on the higher side, averaging about 66%, the maximum being 83% at 11 PM and 46% being its lowest at 3 PM. Barometric pressure is its highest of 29.83inHg at 12 AM, a lowest point of 29.68inHg at 6 PM with an avg 29.77inHg.
Mill Valley, CA Weather – 9-30 – Sunny
74° / 59°
Sunny
In Mill Valley, it will be sunny with highs near 74°F and lows around 59°F. There's a very small chance of rainfall, only about 7%. Wind will be moderate, blowing around 11mph on average and gusts of 18.8mph at 4 PM. The humidity will be on the higher side, averaging about 74%, the maximum being 89% at 4 AM and 52% being its lowest at 4 PM. Barometric pressure is its highest of 29.81inHg at 10 AM, a lowest point of 29.73inHg at 6 PM with an avg 29.76inHg.
Mill Valley, CA Weather – 10-1 – Sunny
73° / 58°
Sunny
Daytime highs will reach 73°F with lows dropping to 58°F in Mill Valley, where it will be sunny. There's a very small chance of rainfall, only about 7%. Wind will be moderate, blowing around 11mph on average and gusts of 16.3mph at 3 PM. The humidity will be on the higher side, averaging about 73%, the maximum being 88% at 4 AM and 55% being its lowest at 3 PM. Barometric pressure is its highest of 29.85inHg at 10 AM, a lowest point of 29.76inHg at 5 PM with an avg 29.8inHg.
Mill Valley, CA Weather – 10-2 – Sunny
76° / 62°
Sunny
Mill Valley could see a sunny day with daytime highs of 76°F and nighttime lows near 62°F. There's a very small chance of rainfall, only about 5%. Winds will be light at 7mph and gusts of 7.2mph at 5 PM. Humidity levels should be comfortable, sitting around 60% on average, the maximum being 70% at 2 AM and 47% being its lowest at 5 PM. Barometric pressure is its highest of 29.92inHg at 11 AM, a lowest point of 29.81inHg at 4 AM with an avg 29.85inHg.
Mill Valley, CA Weather – 10-3 – Sunny
79° / 64°
Sunny
Highs will reach 79°F with lows near 64°F in Mill Valley, where a sunny day is. There's a very small chance of rainfall, only about 4%. Winds will be light at 9mph and gusts of 8.1mph at 5 PM. Humidity levels should be comfortable, sitting around 53% on average, the maximum being 63% at 5 AM and 41% being its lowest at 2 PM. Barometric pressure is its highest of 29.85inHg at 12 AM, a lowest point of 29.73inHg at 5 PM with an avg 29.81inHg.

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