Sunnyvale, CA weather in October
Expect mild, mostly dry weather in Sunnyvale in October, with highs near 74°F and lows near 53°F. Rain falls on about 4 days. Great for outdoor plans.
- Normal high
- 74°F
- Normal low
- 53°F
- Wet days
- 4
- 0.6 in total
- Muggy days
- 0
- dew point 65°F+
How October changes from start to finish
| October 1 | October 31 | |
|---|---|---|
| Normal high | 77°F | 71°F |
| Normal low | 56°F | 50°F |
| Chance of a wet day | 8% | 20% |
| Sunrise / sunset | 7:03 am / 6:51 pm | 7:31 am / 6:11 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 (25 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°F23 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 snow4 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 0.6 in; a dry October brings about 0.06 in and a wet one about 0.8 in (25th and 75th percentiles). Days with half an inch or more are rare.
How October varies from year to year
- Warmest October, 1991-20201992: average high 79°F
- Coolest October2000: average high 69°F
- Wettest October2000: 2.8 in
- Driest October2018: no measurable precipitation
- Highest reading95°F (October 2, 2012)
- Lowest reading41°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 | 78°F | 74°F | 66°F |
| Normal low | 57°F | 53°F | 46°F |
| Wet days | 1 | 4 | 9 |
| Comfortable days | 21 | 23 | 16 |
| Daylight | 12.4 h | 11.2 h | 10.2 h |
Highs change by -4°F from September and -8°F into November.
Nearby alternatives in October
- Warmer: Tracy, CA42 mi · high 80°F · 3 wet days
- Cooler: South Lake Tahoe, CA155 mi · high 62°F · 4 wet days
How Sunnyvale ranks in October
- Normal high161st warmest of 378 cities; 48th of 60 in California
- Wet days71st driest of 378
- Comfortable days4th most of 340
Heating and cooling
October has 83 heating degree days and 40 cooling degree days (base 65°F), 5% of the year's total heating and cooling demand.
Questions
How hot is Sunnyvale in October?
The normal high is 74°F and the normal low is 53°F. From 1991 to 2020 the hottest October reading was 95°F (most recently on October 2, 2012).
Does it rain a lot in Sunnyvale in October?
About 4 days in October have at least 0.01 in of precipitation, and the normal total is 0.6 in. The wettest October in 1991-2020 was in 2000 (2.8 in); the driest was in 2018, with no measurable precipitation.
Is October a good time to visit Sunnyvale?
October ranks 6th of 12 months on our comfort score for Sunnyvale (78 out of 100). It has about 23 comfortable days and about 1 day at 90°F or hotter. The best months are May, June and July.
Where the numbers come from
- Temperature, rain and frost dates: Moffett Federal Airfield (USW00023244), 2.6 mi NNW of the city center, 39 ft (85 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall: Palo Alto (USC00046646), 7.7 mi NW of the city center, 25 ft (99 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snow depth: Newark (USC00046144), 10 mi N of the city center, 10 ft (114 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: San Francisco Intl Airport (USW00023234), 25 mi NW of the city center, 8 ft (116 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: N Y. Mineta Sn Jo Intl Apt (724945-23293), 6.2 mi E of the city center, 49 ft (75 ft lower than the city). Hourly observations, 1991-2020.