San Mateo, CA weather in October
Expect mild, mostly dry weather in San Mateo in October, with highs near 72°F and lows near 53°F. Rain falls on about 3 days. Great for outdoor plans.
- Normal high
- 72°F
- Normal low
- 53°F
- Wet days
- 3
- 0.8 in total
- Muggy days
- 0
- dew point 65°F+
How October changes from start to finish
| October 1 | October 31 | |
|---|---|---|
| Normal high | 75°F | 69°F |
| Normal low | 55°F | 51°F |
| Chance of a wet day | 7% | 15% |
| Sunrise / sunset | 7:04 am / 6:53 pm | 7:33 am / 6:12 pm |
| Daylight | 11.8 h | 10.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Pacific Time).
A typical October day
- 6 am56°Fdew point 50°F
- 9 am62°Fdew point 52°F
- Noon67°Fdew point 51°F
- 3 pm69°Fdew point 50°F
- 6 pm62°Fdew point 50°F
- 9 pm60°Fdew point 50°F
NOAA hourly normals (local standard time) from San Francisco Intl Airport (5 mi away); average wind 9 mph; clear or few clouds in 54% of daytime hours, mostly cloudy or overcast in 29%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F22 of 31
- Beach dayshigh 80-95°F, under 0.05 in of rain, afternoon wind under 15 mph4 of 31
- Hot dayshigh 90°F or more1 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow3 of 31
- Notable rainat least 0.10 in2 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per October, counted from daily records for each year 1991-2020.
Rain in October
Normal precipitation is 0.8 in; a dry October brings about 0.1 in and a wet one about 1.1 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How October varies from year to year
- Warmest October, 1991-20202020: average high 78°F
- Coolest October2000: average high 67°F
- Wettest October2004: 3.2 in
- Driest October2002: no measurable precipitation
- Highest reading95°F (October 3, 2014)
- Lowest reading43°F (October 31, 2002)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
October compared with September and November
| September | October | November | |
|---|---|---|---|
| Normal high | 75°F | 72°F | 64°F |
| Normal low | 56°F | 53°F | 49°F |
| Wet days | 1 | 3 | 7 |
| Comfortable days | 23 | 22 | 11 |
| Daylight | 12.4 h | 11.2 h | 10.2 h |
Highs change by -3°F from September and -8°F into November.
Nearby alternatives in October
- Warmer: Vallejo, CA38 mi · high 78°F · 3 wet days
- Cooler: South Lake Tahoe, CA158 mi · high 62°F · 4 wet days
How San Mateo ranks in October
- Normal high179th warmest of 378 cities; 53rd of 60 in California
- Wet days59th driest of 378
- Comfortable days7th most of 340
Heating and cooling
October has 100 heating degree days and 33 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is San Mateo in October?
The normal high is 72°F and the normal low is 53°F. From 1991 to 2020 the hottest October reading was 95°F (October 3, 2014).
Does it rain a lot in San Mateo in October?
About 3 days in October have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest October in 1991-2020 was in 2004 (3.2 in); the driest was in 2002, with no measurable precipitation.
Is October a good time to visit San Mateo?
October ranks 6th of 12 months on our comfort score for San Mateo (78 out of 100). It has about 22 comfortable days and about 1 day at 90°F or hotter. The best months are July and August.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 4.5 mi NNW of the city center, 8 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Redwood City (USC00047339), 7.6 mi SE of the city center, 31 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: San Francisco International Airport (724940-23234), 4.5 mi NNW of the city center, 10 ft . Hourly observations, 1991-2020.