Heat waves in United States
335 heat waves have been recorded in United States by Global Incident Tracker, 335 of them in 2026. The most recent was on 9 October 2026. These are incidents our sources reported, not an official national total.
0
Today (UTC)
70
Last 7 days
335
In 2026
335
Total recorded
Continuous monitoring began 9 August 2026. These counters show what we have recorded since then, not everything that happened.
Most recent heat waves in United States
Extreme Heat Warning — Death Valley National Park
Severe
Extreme Heat Warning — Imperial County West; Imperial Valley
Severe
Extreme Heat Warning — Yuma
Severe
Extreme Heat Warning — San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland V
Severe
Extreme Heat Warning — Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Severe
Extreme Heat Warning — Death Valley National Park
Severe
Extreme Heat Warning — Imperial County West; Imperial Valley
Severe
Extreme Heat Warning — Yuma
Severe
Extreme Heat Warning — Parker Valley; Gila River Valley; Palo Verde Valley; Chuckwalla Valley
Severe
Extreme Heat Warning — San Diego County Coastal Areas
Severe
Extreme Heat Warning — San Bernardino and Riverside County Valleys-The Inland Empire
Severe
Extreme Heat Warning — Orange County Inland
Severe
Extreme Heat Warning — Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Severe
Extreme Heat Warning — Santa Ana Mountains and Foothills
Severe
Extreme Heat Warning — San Diego County Inland Valleys
Severe
Extreme Heat Warning — Orange County Coastal
Severe
Extreme Heat Warning — Cuyama Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains We
Severe
Extreme Heat Warning — Catalina and Santa Barbara Islands; Santa Clarita Valley; Ventura County Beaches; Ventura County Inland Coast; Lake Casi
Severe
Extreme Heat Warning — San Diego County Inland Valleys
Severe
Extreme Heat Warning — San Bernardino and Riverside County Valleys-The Inland Empire
Severe
Extreme Heat Warning — Orange County Inland
Severe
Extreme Heat Warning — Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Severe
Extreme Heat Warning — San Diego County Coastal Areas
Severe
Extreme Heat Warning — Orange County Coastal
Severe
Extreme Heat Warning — Santa Ana Mountains and Foothills
Severe
Extreme Heat Warning — Cuyama Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains We
Severe
Extreme Heat Warning — Catalina and Santa Barbara Islands; Santa Clarita Valley; Ventura County Beaches; Ventura County Inland Coast; Lake Casi
Severe
Extreme Heat Warning — Death Valley National Park
Severe
Extreme Heat Warning — Parker Valley; Gila River Valley; Palo Verde Valley; Chuckwalla Valley
Severe
Extreme Heat Warning — Imperial County West; Imperial Valley
Severe
When they happen
August carries the most heat waves we hold for United States — 155 of 335. This is when incidents were reported, so read a quiet month as either a quiet month or thin reporting.
| Month | Recorded | |
|---|---|---|
| January | 0 | |
| February | 0 | |
| March | 0 | |
| April | 0 | |
| May | 0 | |
| June | 0 | |
| July | 0 | |
| August | 155 | |
| September | 82 | |
| October | 98 | |
| November | 0 | |
| December | 0 |
Where this data comes from
Heat waves have official real-time feeds, and ours come from US NWS · Meteoalarm · national services (CAP) · news.