San Mateo, CA · 2026
Sunrise and sunset in San Mateo, California
Short answer
- Longest day
- 14 h 46 min
- Shortest day
- 9 h 34 min
San Mateo daylight through 2026
Daylight in San Mateo runs from 9 h 34 min on December 21 to 14 h 46 min on June 20, a seasonal swing of 5 h 12 min between June 21 and December 21. That swing ranks 143rd of 342 US cities of 100,000+, where 1st is the largest. Around the March equinox the city gets 12 h 09 min, and around the September equinox 12 h 09 min.
San Mateo daylight by month
| Month | Average | Sunrise | Sunset |
|---|---|---|---|
| January | 9 h 55 min | 7:13 AM to 7:24 AM | 5:01 PM to 5:32 PM |
| February | 10 h 50 min | 6:41 AM to 7:12 AM | 5:33 PM to 6:02 PM |
| March | 11 h 59 min | 6:31 AM to 7:30 AM | 6:03 PM to 7:31 PM |
| April | 13 h 12 min | 6:14 AM to 6:54 AM | 7:32 PM to 7:58 PM |
| May | 14 h 13 min | 5:49 AM to 6:13 AM | 7:59 PM to 8:24 PM |
| June | 14 h 43 min | 5:47 AM to 5:51 AM | 8:25 PM to 8:34 PM |
| July | 14 h 27 min | 5:51 AM to 6:12 AM | 8:18 PM to 8:34 PM |
| August | 13 h 33 min | 6:13 AM to 6:38 AM | 7:39 PM to 8:17 PM |
| September | 12 h 24 min | 6:39 AM to 7:04 AM | 6:53 PM to 7:37 PM |
| October | 11 h 12 min | 7:04 AM to 7:33 AM | 6:11 PM to 6:52 PM |
| November | 10 h 09 min | 6:34 AM to 7:04 AM | 4:51 PM to 5:10 PM |
| December | 9 h 37 min | 7:05 AM to 7:23 AM | 4:50 PM to 5:00 PM |
Earliest sunrise, latest sunset and the clock
The earliest sunrise comes on June 7 at 5:47 AM and the latest sunset on June 22 at 8:34 PM. The latest sunrise is 7:33 AM on October 31. Daylight saving time starts and ends on March 8 and November 1, which shifts every clock time by an hour.
On standard time the clocks run 8 hours behind UTC, the time of the 120° W meridian. San Mateo sits at 122.31° W, so the sun runs about 9 minutes behind the zone clock. Solar noon is at 12:18 PM on January 15 and 1:15 PM on July 15.
Compared with nearby cities
Sacramento, the state capital, gets 6 minutes more daylight than San Mateo on June 21 and 6 minutes less on December 21. Day length depends on latitude, so the table lists the paired cities from north to south.
| City | Latitude | June 21 | December 21 |
|---|---|---|---|
| Richmond, CA | 37.95° N | 14 h 48 min | 9 h 32 min |
| Berkeley, CA | 37.87° N | 14 h 48 min | 9 h 32 min |
| Oakland, CA | 37.77° N | 14 h 47 min | 9 h 33 min |
| San Francisco, CA | 37.73° N | 14 h 47 min | 9 h 33 min |
| Daly City, CA | 37.70° N | 14 h 47 min | 9 h 33 min |
| Hayward, CA | 37.63° N | 14 h 46 min | 9 h 34 min |
| San Mateo, CA | 37.56° N | 14 h 46 min | 9 h 34 min |
| Fremont, CA | 37.49° N | 14 h 45 min | 9 h 34 min |
| Sunnyvale, CA | 37.39° N | 14 h 45 min | 9 h 35 min |
| Santa Clara, CA | 37.36° N | 14 h 44 min | 9 h 35 min |
| San Jose, CA | 37.30° N | 14 h 44 min | 9 h 36 min |
| Salinas, CA | 36.69° N | 14 h 40 min | 9 h 39 min |
| Urban Honolulu, HI | 21.32° N | 13 h 26 min | 10 h 50 min |
Questions people ask
What is the longest day of the year in San Mateo?
June 20, 2026, with 14 h 46 min of daylight: sunrise 5:48 AM, sunset 8:33 PM.
What is the shortest day in San Mateo?
December 21, 2026, with 9 h 34 min: sunrise 7:20 AM, sunset 4:54 PM.
When is the latest sunset in San Mateo?
8:34 PM on June 22, 2026. The earliest sunset is 4:50 PM on December 2.
What time zone is San Mateo in?
America/Los_Angeles. Clocks change on March 8 (to PDT) and November 1 (to PST) in 2026.
Sources and data as of
Data as of: computed for 2026 at the Census internal point of San Mateo, 37.560° N, 122.311° W; time zone from Open-Meteo.
- 01SunCalc library (Vladimir Agafonkin), algorithms after Jean Meeus
- 02IANA time zone database (clock times and daylight saving rules)
How every number is computed: methodology. Spotted a wrong figure? Report an error.