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What is Mill Valley, CA, Weather Like in October?
During the month of October, Mill Valley, CA,
has an average daytime high temperature of 77°F and an average overnight low temperature dropping to 50°F.
Around 1.98 inches of precipitation is received during the month,
with about 29.98 inches falling in a typical year.
Snow is not common in Mill Valley, CA.
October 2025: Actual vs. Average Temperatures
Showing temperatures through today (October 22, 2025)
Actual High
Average High
Actual Low
Average Low
Month Summary
Average High: 73.7 F
(-3.9 vs avg)
Average Low: 50.8 F
(0.0 vs avg)
Daytime temperatures were significantly below average.
Actual data from: MID_F0247
Mill Valley, CA Daily Weather Averages for October
Recorded at Kentfield
(usc00044500),
3.5 miles
N of
Mill Valley, CA
| Day | Avg Temps (°F) | Precip (in) | Snow (in) | Degree Days (°F) | |||||
|---|---|---|---|---|---|---|---|---|---|
| Low | High | Mean | Month | Year | Month | Year | Heat | Cool | |
| 10/1 | 52 F | 80 F | 66 F | 0.03" | 28.03" | 0.00" | 0.00" | 1.6 F | 2.5 F |
| 10/2 | 52 F | 80 F | 66 F | 0.06" | 28.06" | 0.00" | 0.00" | 1.6 F | 2.4 F |
| 10/3 | 52 F | 80 F | 66 F | 0.09" | 28.09" | 0.00" | 0.00" | 1.7 F | 2.3 F |
| 10/4 | 52 F | 79 F | 66 F | 0.12" | 28.12" | 0.00" | 0.00" | 1.8 F | 2.3 F |
| 10/5 | 51 F | 79 F | 65 F | 0.16" | 28.16" | 0.00" | 0.00" | 1.9 F | 2.2 F |
| 10/6 | 51 F | 79 F | 65 F | 0.19" | 28.19" | 0.00" | 0.00" | 2 F | 2.1 F |
| 10/7 | 51 F | 79 F | 65 F | 0.23" | 28.23" | 0.00" | 0.00" | 2.1 F | 2.1 F |
| 10/8 | 51 F | 79 F | 65 F | 0.26" | 28.26" | 0.00" | 0.00" | 2.2 F | 2 F |
| 10/9 | 51 F | 78 F | 65 F | 0.30" | 28.30" | 0.00" | 0.00" | 2.3 F | 1.9 F |
| 10/10 | 51 F | 78 F | 64 F | 0.35" | 28.35" | 0.00" | 0.00" | 2.4 F | 1.8 F |
| 10/11 | 51 F | 78 F | 64 F | 0.40" | 28.40" | 0.00" | 0.00" | 2.5 F | 1.7 F |
| 10/12 | 51 F | 77 F | 64 F | 0.45" | 28.45" | 0.00" | 0.00" | 2.6 F | 1.6 F |
| 10/13 | 51 F | 77 F | 64 F | 0.50" | 28.50" | 0.00" | 0.00" | 2.7 F | 1.5 F |
| 10/14 | 50 F | 77 F | 64 F | 0.56" | 28.56" | 0.00" | 0.00" | 2.9 F | 1.5 F |
| 10/15 | 50 F | 77 F | 63 F | 0.63" | 28.63" | 0.00" | 0.00" | 3 F | 1.4 F |
| 10/16 | 50 F | 76 F | 63 F | 0.69" | 28.69" | 0.00" | 0.00" | 3.1 F | 1.3 F |
| 10/17 | 50 F | 76 F | 63 F | 0.76" | 28.76" | 0.00" | 0.00" | 3.3 F | 1.2 F |
| 10/18 | 50 F | 76 F | 63 F | 0.83" | 28.83" | 0.00" | 0.00" | 3.4 F | 1.1 F |
| 10/19 | 50 F | 75 F | 62 F | 0.90" | 28.90" | 0.00" | 0.00" | 3.6 F | 1 F |
| 10/20 | 50 F | 75 F | 62 F | 0.97" | 28.97" | 0.00" | 0.00" | 3.7 F | 0.9 F |
| 10/21 | 49 F | 74 F | 62 F | 1.04" | 29.04" | 0.00" | 0.00" | 3.9 F | 0.8 F |
| 10/22 | 49 F | 74 F | 62 F | 1.12" | 29.12" | 0.00" | 0.00" | 4 F | 0.7 F |
| 10/23 | 49 F | 74 F | 61 F | 1.21" | 29.21" | 0.00" | 0.00" | 4.2 F | 0.6 F |
| 10/24 | 49 F | 73 F | 61 F | 1.30" | 29.30" | 0.00" | 0.00" | 4.4 F | 0.5 F |
| 10/25 | 49 F | 73 F | 61 F | 1.39" | 29.39" | 0.00" | 0.00" | 4.6 F | 0.4 F |
| 10/26 | 49 F | 72 F | 61 F | 1.49" | 29.49" | 0.00" | 0.00" | 4.9 F | 0.4 F |
| 10/27 | 49 F | 72 F | 60 F | 1.59" | 29.59" | 0.00" | 0.00" | 5.1 F | 0.4 F |
| 10/28 | 48 F | 72 F | 60 F | 1.68" | 29.68" | 0.00" | 0.00" | 5.4 F | 0.3 F |
| 10/29 | 48 F | 71 F | 60 F | 1.78" | 29.78" | 0.00" | 0.00" | 5.6 F | 0.3 F |
| 10/30 | 48 F | 71 F | 59 F | 1.88" | 29.88" | 0.00" | 0.00" | 5.9 F | 0.2 F |
| 10/31 | 48 F | 70 F | 59 F | 1.98" | 29.98" | 0.00" | 0.00" | 6.1 F | 0.2 F |
