San Luis Potosí runs on UTC−6 (CST) every day of the year, with no daylight saving time.
San Luis Potosí and your time
San Luis Potosí at a glance
| Country | Mexico |
|---|---|
| Region | San Luis Potosí |
| Time zone | America/Monterrey |
| Abbreviation now | CST |
| UTC offset now | UTC−6 |
| Daylight saving time | Not observed since 2022 |
| Coordinates | 22.15° N, 100.97° W |
Time zone in San Luis Potosí
San Luis Potosí follows the America/Monterrey time zone and stays on UTC−6 all year. Clocks here last changed for daylight saving time in 2022; the tz database lists no change after that.
Mexico spans 4 offsets. San Luis Potosí shares its time with the capital, Mexico City.
Clock changes in San Luis Potosí, 2026 and 2027
No clock changes are scheduled in San Luis Potosí for 2026 or 2027.
San Luis Potosí time compared with major cities
A 9:00 AM start in San Luis Potosí is 3:00 PM in London, 2:00 AM (next day) in Sydney and 7:00 AM in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| Mexico City | --:-- | Same time | Same time | Same time | 8 h |
| New York (United States) | --:-- | 1 h ahead | 1 h ahead | 2 h ahead | 7 h |
| Los Angeles (United States) | --:-- | 2 h behind | 2 h behind | 1 h behind | 6 h |
| London (United Kingdom) | --:-- | 6 h ahead | 6 h ahead | 7 h ahead | 2 h |
| Paris (France) | --:-- | 7 h ahead | 7 h ahead | 8 h ahead | 1 h |
| Dubai (United Arab Emirates) | --:-- | 10 h ahead | 10 h ahead | 10 h ahead | None |
| Mumbai (India) | --:-- | 11 h 30 min ahead | 11 h 30 min ahead | 11 h 30 min ahead | None |
| Singapore | --:-- | 14 h ahead | 14 h ahead | 14 h ahead | None |
| Tokyo (Japan) | --:-- | 15 h ahead | 15 h ahead | 15 h ahead | None |
| Sydney (Australia) | --:-- | 17 h ahead | 17 h ahead | 16 h ahead | None |
| UTC | --:-- | 6 h ahead | 6 h ahead | 6 h ahead | 2 h |
San Luis Potosí never changes its clocks, but many of these cities do. Where the January and July columns disagree, the gap shifts when the other city moves to or from daylight saving time.
Shared office hours is the part of a 9 AM to 5 PM local working day that both cities have in common. Weekends are not taken into account.
Sunrise and sunset in San Luis Potosí
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
Close to the equator, days in San Luis Potosí last between 10 hours 47 minutes and 13 hours 29 minutes, so evenings get dark at about the same time all year.
Daylight through the year in San Luis Potosí
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 6:48 AM | 6:55 PM | 12 h 7 min |
| June solstice | June 21 | 6:01 AM | 7:30 PM | 13 h 29 min |
| September equinox | September 22 | 6:33 AM | 6:40 PM | 12 h 7 min |
| December solstice | December 21 | 7:19 AM | 6:06 PM | 10 h 47 min |
When the sun is highest in San Luis Potosí
San Luis Potosí sits well west of the centre of its time zone. On average the sun reaches its highest point at about 12:45 PM on standard time, not at 12:00. Mornings stay dark longer and evenings stay light later than the clock suggests.
Cities near San Luis Potosí
Every city below shares San Luis Potosí’s clock.
| City | Distance | Time now | Difference |
|---|---|---|---|
| León | 136 km (85 mi) | --:-- | Same time |
| Aguascalientes | 139 km (86 mi) | --:-- | Same time |
| San Miguel de Allende | 140 km (87 mi) | --:-- | Same time |
| Irapuato | 169 km (105 mi) | --:-- | Same time |
| Guadalupe | 172 km (107 mi) | --:-- | Same time |
| Salamanca | 178 km (110 mi) | --:-- | Same time |
| Celaya | 182 km (113 mi) | --:-- | Same time |
| Querétaro | 184 km (114 mi) | --:-- | Same time |
Cities that share San Luis Potosí’s time zone
These cities follow the same time zone rules as San Luis Potosí.
Same time now, different rules
These places read the same time as San Luis Potosí today but follow different rules, so they can drift apart when clocks change.
More cities in Mexico
All time zones and cities in Mexico
Plan around the time in San Luis Potosí
- Convert a time to or from San Luis Potosí: pick a date and time and see it in every city on your list.
- Add San Luis Potosí to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in San Luis Potosí and the other cities you work with.
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Frequently asked questions
What time zone is San Luis Potosí in?
San Luis Potosí uses the America/Monterrey time zone, which is UTC−6 (CST) all year.
Does San Luis Potosí use daylight saving time?
Not any more. San Luis Potosí last changed its clocks for daylight saving time in 2022 and now stays on UTC−6 all year.
What is the time difference between San Luis Potosí and London?
San Luis Potosí is 6 hours behind London in January and 7 hours behind London in July, because London moves its clocks for daylight saving time and San Luis Potosí does not.
Is San Luis Potosí on the same time as Mexico City?
Yes. San Luis Potosí and Mexico City both use UTC−6 right now.
How long is the longest day in San Luis Potosí?
About 13 hours 29 minutes, around the June solstice. The shortest day, around the December solstice, has about 10 hours 47 minutes of daylight.
Why is the sun not highest at noon in San Luis Potosí?
Clock time follows the time zone, not the sun. San Luis Potosí lies west of the line its offset is based on, so solar noon comes at about 12:45 PM on standard time.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.