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San Sebastián, Puerto Rico

San Sebastián runs on Atlantic Standard Time, with a fixed UTC−4 offset. It follows Puerto Rico’s policy of keeping the same clock time standard throughout the year.

San Sebastian, Puerto Rico

4:28:32 PM

Sunday, 6 September 2026

UTC−4 · America/Puerto_Rico

Time and sun data for San Sebastian — the largest city of San Sebastián

The sun in San Sebastian

Sunrise 6:16 AM Solar noon 12:28 PM Sunset 6:40 PM Daylight 12 h 24 min Night 11 h 36 min Civil twilight 5:54 AM – 7:02 PM

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Current time in San Sebastián, Puerto Rico

The clock in San Sebastián agrees with clocks across Puerto Rico. There is no time-zone boundary between this northwestern municipality and San Juan, Mayagüez, Ponce, or the island’s other destinations. Domestic itineraries need travel time, but no clock conversion.

When calling abroad, remember that the fixed AST label describes San Sebastián, not necessarily the other participant. A location using seasonal time may alter the difference between the two clocks. Verify the comparison on the date of the call, particularly for a repeating schedule.

Zone: Atlantic Standard Time Abbreviation: AST Position relative to UTC: four hours behind Daylight saving time: not observed San Sebastián leaves clock-changing drama to places with longer winters and shorter memories.

Sunrise in northwestern Puerto Rico

Sunrise has a precise date as well as a place. Its clock time changes over the year, and San Sebastián’s position in northwestern Puerto Rico means it does not exactly match the sunrise listed for San Juan or an eastern coastal municipality.

All those locations still share UTC−4. The variation is solar rather than administrative: eastern places encounter the rising sun slightly earlier than western ones. Morning twilight starts before sunrise, which can matter more than the sunrise instant for some outdoor plans.

The published calculation cannot describe every view. Hills, vegetation, buildings, and clouds can conceal the solar disk, while an open elevated horizon may offer a clearer first sight. Check current weather, access, and safety conditions in addition to astronomical times.

Using major Puerto Rico cities as references

San Sebastián is a municipality within Puerto Rico’s unified civil-time region. San Juan is the capital and chief urban center. Bayamón and Carolina are other large northern municipalities; Ponce is a principal southern center; Caguas is prominent inland; and Mayagüez is an important western destination.

Lists of the largest cities are not always directly comparable. Some rank entire municipalities, some count named places, and others describe connected urban areas. Those differences should be preserved when discussing population. They have no effect on the practical clock: every municipality named here uses AST.

Read Puerto Rican event times directly as San Sebastián local time. Convert to UTC by moving four hours forward. Check seasonal rules before converting to an external location. Use the correct date and coordinates for accurate solar information.

Questions and answers

Is San Sebastián on the same time as the rest of Puerto Rico?: Yes. Puerto Rico uses one time zone throughout its municipalities.
Will a phone update its clock seasonally in San Sebastián?: It should not change for daylight saving time because the municipality stays on UTC−4.
Does a later western sunrise mean a different time zone?: No. It results from longitude within the same time zone.