🌡️
Heat Advisory
◍ San Juan and Vicinity · USA · updated 8/21/2026, 6:56:00 AM
⏱ In effect until 12:00 PM UTC-4
Severity score
65/100
Confidence
High
Why this matters
* WHAT...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. expected. * WHERE...Portions of Puerto Rico and Virgin Islands. * WHEN...From 10 AM this morning to 5 PM AST this afternoon. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.
Key stats
Severity
Moderate
Certainty
Likely
Urgency
Expected
Severity over time
Timeline
- Heat Advisory8/21/2026, 6:56:00 AMHeat Advisory issued August 21 at 2:56AM AST until August 21 at 5:00PM AST by NWS San Juan PR
Sources & attribution
OfficialNWS NWS San Juan PRupdated 8/21/2026, 6:56:00 AM
OfficialNWS NWS Wilmington NCupdated 8/21/2026, 6:12:00 AM
OfficialNWS NWS Charleston SCupdated 8/21/2026, 6:04:00 AM
OfficialNWS NWS Shreveport LAupdated 8/21/2026, 5:29:00 AM
OfficialNWS NWS Miami FLupdated 8/21/2026, 5:15:00 AM
OfficialNWS NWS Newport/Morehead City NCupdated 8/21/2026, 5:13:00 AM
OfficialNWS NWS Dodge City KSupdated 8/21/2026, 5:03:00 AM
OfficialNWS NWS Houston/Galveston TXupdated 8/21/2026, 4:52:00 AM
OfficialNWS NWS Jacksonville FLupdated 8/21/2026, 4:46:00 AM
OfficialNWS NWS Lake Charles LAupdated 8/21/2026, 4:09:00 AM
OfficialNWS NWS Amarillo TXupdated 8/21/2026, 4:04:00 AM
OfficialNWS NWS Tulsa OKupdated 8/21/2026, 4:03:00 AM
OfficialNWS NWS Corpus Christi TXupdated 8/21/2026, 3:48:00 AM
OfficialNWS NWS Salt Lake City UTupdated 8/21/2026, 3:43:00 AM
OfficialNWS NWS Salt Lake City UTupdated 8/21/2026, 3:43:00 AM
OfficialNWS NWS Lubbock TXupdated 8/21/2026, 3:33:00 AM
OfficialNWS NWS Birmingham ALupdated 8/21/2026, 2:40:00 AM
OfficialNWS NWS Birmingham ALupdated 8/21/2026, 2:40:00 AM
OfficialNWS NWS Mobile ALupdated 8/21/2026, 12:34:00 AM
OfficialNWS NWS Tallahassee FLupdated 8/20/2026, 6:21:00 PM
OfficialNWS NWS Spokane WAupdated 8/20/2026, 5:28:00 PM
OfficialNWS NWS Missoula MTupdated 8/20/2026, 4:25:00 PM
⚠This is an informational severity score, not an official warning. Follow guidance from NWS/NOAA, FEMA (ready.gov), and local emergency management.