Chicago to San Mateo time converter

San Mateo is 2 hours behind Chicago. When it is 9:00 AM in Chicago, it is 7:00 AM in San Mateo.

Chicago CDT

Wednesday, October 21, 2026

San Mateo PDT

Wednesday, October 21, 2026

Chicago
Illinois, United States
Wed, Oct 21
CDTUTC-5
San Mateo
California, United States
Wed, Oct 21
PDTUTC-7-2h
Finding your time zone…
Shared working hours (9:00–18:00)

Chicago to San Mateo conversion table

Every hour of today in Chicago and the matching time in San Mateo. Light rows are typical working hours (9:00–18:00).

ChicagoSan Mateo
12:00 AM10:00 PM−1 day
1:00 AM11:00 PM−1 day
2:00 AM12:00 AM
3:00 AM1:00 AM
4:00 AM2:00 AM
5:00 AM3:00 AM
6:00 AM4:00 AM
7:00 AM5:00 AM
8:00 AM6:00 AM
9:00 AM7:00 AM
10:00 AM8:00 AM
11:00 AM9:00 AM
12:00 PM10:00 AM
1:00 PM11:00 AM
2:00 PM12:00 PM
3:00 PM1:00 PM
4:00 PM2:00 PM
5:00 PM3:00 PM
6:00 PM4:00 PM
7:00 PM5:00 PM
8:00 PM6:00 PM
9:00 PM7:00 PM
10:00 PM8:00 PM
11:00 PM9:00 PM

Best time to call or meet

Both sides are at work from 11:00 AM – 6:00 PM in Chicago (9:00 AM – 4:00 PM in San Mateo).

Daylight saving time and the difference

The difference changes during the year because Chicago and San Mateo switch clocks on different dates:

  • Oct 21, 2026 – Nov 1, 2026: -2h
  • Nov 1, 2026 – Nov 1, 2026: -1h
  • Nov 1, 2026 – Mar 14, 2027: -2h
  • Mar 14, 2027 – Mar 14, 2027: -3h
  • Mar 14, 2027 – Oct 21, 2027: -2h

Distance

Chicago and San Mateo are 2,984 km (1,854 miles) apart in a straight line.

More conversions

San Mateo to ChicagoChicago to New YorkChicago to LondonChicago to Los AngelesChicago to TorontoChicago to São PauloChicago to ParisChicago to BerlinChicago to MoscowChicago to DubaiChicago to New DelhiChicago to BangkokChicago to Singapore
New York to San MateoLondon to San MateoLos Angeles to San MateoToronto to San MateoSão Paulo to San MateoParis to San MateoBerlin to San MateoMoscow to San MateoDubai to San MateoNew Delhi to San MateoBangkok to San MateoSingapore to San Mateo

Questions and answers

What is the time difference between Chicago and San Mateo?

San Mateo is 2 hours behind Chicago.

What time is it in San Mateo when it is 9 AM in Chicago?

When it is 9:00 AM in Chicago, it is 7:00 AM in San Mateo.

When is the best time to call San Mateo from Chicago?

Both sides are at work from 11:00 AM – 6:00 PM in Chicago (9:00 AM – 4:00 PM in San Mateo).

Does the time difference between Chicago and San Mateo change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.