October weather in Portola Valley, CA
The average temperature in Portola Valley in October is 61.4°F (51.7°F–71.0°F). Average precipitation: 1.73 inches.
October is a fall month in Portola Valley, and is warmer than the annual average of 57.1°F. Daily temperatures swing about 19.3°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 11h 1m. For travel, October is one of the best months of the year to visit.
Avg High
71.0°F
Avg Low
51.7°F
Precipitation
1.73 in
Daylight
11h 1m
October records in Portola Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| October 1 | 97.0°F (2024) | 42.1°F (2019) | 0.04 in (1998) |
| October 2 | 102.0°F (2024) | 45.0°F (2004) | 0.62 in (2025) |
| October 3 | 100.0°F (2024) | 42.1°F (2017) | 0.02 in (1998) |
| October 4 | 93.9°F (2024) | 39.0°F (2009) | 0.94 in (2008) |
| October 5 | 93.9°F (2024) | 39.0°F (2009) | 1.19 in (2011) |
| October 6 | 96.1°F (2024) | 44.1°F (2011) | 0.34 in (2011) |
| October 7 | 95.0°F (2024) | 43.0°F (1997) | 0.28 in (2011) |
| October 8 | 91.9°F (2024) | 39.9°F (1997) | 0.01 in (1998) |
| October 9 | 84.9°F (2002) | 39.9°F (2007) | 0.65 in (1997) |
| October 10 | 86.0°F (2022) | 39.9°F (2007) | 0.91 in (2007) |
| October 11 | 82.0°F (2014) | 39.9°F (1997) | 0.56 in (2011) |
| October 12 | 87.1°F (2015) | 39.9°F (1997) | 0.20 in (2007) |
| October 13 | 91.9°F (2015) | 43.0°F (2000) | 1.30 in (2025) |
| October 14 | 91.9°F (2015) | 45.0°F (2006) | 4.21 in (2009) |
| October 15 | 88.0°F (2010) | 45.0°F (2005) | 1.18 in (2016) |
| October 16 | 82.9°F (2001) | 42.1°F (2002) | 2.54 in (2016) |
| October 17 | 89.1°F (2020) | 43.0°F (2002) | 0.17 in (2004) |
| October 18 | 87.1°F (1997) | 41.0°F (2021) | 0.82 in (2004) |
| October 19 | 89.1°F (2023) | 42.1°F (2002) | 0.90 in (2004) |
| October 20 | 86.0°F (2022) | 42.1°F (2004) | 1.37 in (2004) |
| October 21 | 84.0°F (2020) | 39.9°F (2004) | 0.03 in (2004) |
| October 22 | 84.9°F (2003) | 42.1°F (2001) | 0.51 in (2012) |
| October 23 | 79.0°F (1999) | 41.0°F (2010) | 0.09 in (2010) |
| October 24 | 82.9°F (2007) | 42.1°F (1999) | 0.66 in (2004) |
| October 25 | 86.0°F (2017) | 39.9°F (2022) | 1.97 in (2010) |
| October 26 | 86.0°F (2017) | 39.9°F (2023) | 1.05 in (2004) |
| October 27 | 82.9°F (2017) | 37.9°F (2004) | 0.73 in (2000) |
| October 28 | 84.0°F (2017) | 39.0°F (2004) | 0.66 in (1999) |
| October 29 | 86.0°F (2003) | 41.0°F (2004) | 1.50 in (2000) |
| October 30 | 80.1°F (2008) | 37.0°F (2006) | 0.58 in (2016) |
| October 31 | 81.0°F (2015) | 35.1°F (2006) | 0.41 in (2014) |