Full Breakdown
Miami Ties All-Time 100°F Record Amid Stalled Heat Dome
8/20/2026, 1:33:37 AM
Core Event: Record-High Temperature in Miami
On a Tuesday in mid-August 2026, Miami’s outdoor thermometer reached 100 °F, matching the city’s all-time high first recorded on July 21, 1942. The temperature was recorded by the National Weather Service (NWS) and triggered a heat advisory covering most of the Florida Peninsula except the Keys.
Background & Context
A persistent high-pressure “heat dome” over the Southeast United States has been anchoring warm, humid air, preventing the usual sea-breeze cooling effect along the coast. The dome has also driven record-high readings in other Florida cities and in Tallahassee, where 100 °F was observed for a second consecutive day. Climate researchers at Climate Central note that Miami now experiences 44 more days with above-normal summer temperatures than in the 1970s, with an average summer warming of 2.6 °F since that decade.
Data & Statistics
- Historical benchmark: 100 °F ties the record set on July 21, 1942.
- Heat-related days: 117 days of dangerously humid heat were recorded between 2016 and 2025, up from 50 days in the 1970s.
- Attribution: Climate Central attributes roughly 80 of those extreme-heat days to human-caused climate change from fossil-fuel combustion.
- Heat index: The heat index peaked at 107 °F according to CNN, while Foxweather reported values could reach as high as 115 °F in some locations.
Official Statements & Responses
- The NWS issued a heat advisory warning that heat-index values could exceed 100 °F and advised residents to stay hydrated, limit outdoor activity, and use air-conditioning when possible.
- NWS meteorologist Andy Haner explained that three 100-degree days during a summer are “pretty on target” for Tallahassee, indicating that such extremes are becoming more common in the region.
- Climate Central researchers emphasized that the recent surge in extreme-heat days aligns with broader trends linked to anthropogenic climate warming.
On-the-Ground Reports
Local residents reported “feels-like” temperatures well above 100 °F, prompting health officials to urge the public to avoid outdoor exposure during the hottest part of the day. Photographs from Miami Beach showed beachgoers seeking shade in public showers and restaurants.
Conflicting Reports & Gaps
Sources differ on the maximum heat-index value: CNN cites a peak of 107 °F, whereas Foxweather projects potential values up to 115 °F. No additional data were provided to reconcile these figures, leaving the precise heat-index peak uncertain.
Verbatim Quotes
- “You’d think we’ve become Tucson or something,” — The Miami
- “It’s not unheard of to be that late,” — Coordination Meteorologist Robert Garcia
- “I would say getting three 100-degree days during summer is pretty on target,” — Andy Haner
- “People say, ‘Oh, it’s just summertime in South Florida,’ but the heat can cause serious injury,” — Coordination Meteorologist Robert Garcia
What’s Next
Heat advisories remain in effect through the weekend, with forecasts calling for mid-90s temperatures across most of Florida and a 10 % chance that Miami International Airport could again reach 100 °F on Wednesday. Meteorologists expect the high-pressure ridge to shift westward later in the week, potentially allowing afternoon thunderstorms and modest cooling. Residents are advised to continue monitoring local alerts and to follow NWS safety recommendations.
