Heat in Connecticut

Events

136

Deaths

1

Injuries

0

Damage

None recorded

• Heat in Connecticut, July 2 to 4, 20021 death · 6 eventsTemperatures rose into the mid and upper 90s across interior Southern Connecticut and into the lower and mid 90s along the shores of Long Island Sound.
• Heat and Damaging Winds in Connecticut, July 25, 20251 injured · 50 kt wind · 7 eventsHot and humid conditions developed across portions of northwestern Connecticut on July 25, 2025 ahead of a passing cold front. Peak heat index values (feels like temperatures) between 95 and 102 degrees were observed.
• Tornado and Heat in Connecticut, June 21, 2024$15,000 · EF0 · 5 eventsJune 21, 2024 was the fourth day in the stretch of hot, humid conditions. Heat index (or feels like temperatures) reached between 95 and 104 degrees across Litchfield County.
• Heat and Damaging Winds in Connecticut, July 6, 202150 kt wind · 12 eventsStrong to severe thunderstorms developed during the afternoon hours of Tuesday, July 6th, 2021, as an upper level disturbance tracked through the region. Several downed trees and wires resulted from the strongest storms. More than 25,000 customers lost power.
• Heat in Connecticut, July 4 to 6, 19998 eventsAn extremely hot and humid airmass covered the region from July 4th through July 6th.On Sunday July 4th, temperatures soared into the mid 90s.
• Excessive Heat and Heat in Connecticut, July 15 to 19, 20138 eventsA large ridge of high pressure was situated along the eastern seaboard for the week of July 15th through July 19th. The flow around this high pressure ridge brought a very warm and humid air mass into Connecticut for much of the week, along with plenty of sunshine.
• Heat in Connecticut, August 8 to 10, 20017 eventsA Bermuda high pressure system "pumped" hot temperatures and high humidities across the region. Daytime temperatures broke records in a few locations. Maximum temperatures ranged from the mid 90s to 100 degrees in urban areas, which produced heat indices from 105 to 110 degrees.
• Excessive Heat and Heat in Connecticut, July 21, 20197 eventsA Bermuda High pumped in a hot and humid and humid air mass northward into the area.
• Excessive Heat and Heat in Connecticut, July 20, 20197 eventsA Bermuda High pumped in a hot and humid and humid air mass northward into the area.
• Excessive Heat and Heat in Connecticut, June 22 to 25, 20257 eventsA dome of high pressure brought a period of very hot and humid conditions across northwestern Connecticut from June 22-25, 2025. Peak heat index values (or feels-like temperatures) were between 95 and 104 degrees Fahrenheit in many locations.
• Heat and Damaging Winds in Connecticut, June 11 to 12, 202650 kt wind · 7 eventsA hot and humid air mass advected into northwestern Connecticut on June 11-12, 2026 ahead of an approaching low pressure system and cold front. Heat index values (feels like temperatures) reached the mid-90s to lower 100s across portions of southern Litchfield County both days.
• Excessive Heat and Heat in Connecticut, July 6 to 7, 20106 eventsA strong ridge built into Southern New England resulting in temperatures nearing 100 with high humidity. Heat index values ranged from 100 to 106 for most of Southern New England on the 6th and again on the 7th in a more limited area, generally the Connecticut River Valley.
• Heat and Damaging Winds in Connecticut, July 7 to 8, 202550 kt wind · 6 eventsA period of hot and humid weather occurred across northwestern Connecticut on July 7-8, 2025 with heat index values (feels like temperatures) reaching 95 to 102 degrees each afternoon.
• Excessive Heat and Heat in Connecticut, July 21 to 23, 20115 eventsBermuda high pressure dominated the region with broad southwest flow aloft. This flow ushered in hot and humid air. Temperatures across Litchfield County warmed well into the 90s each day. On Friday July 22nd, the Thomaston Dam reported a high of 100 degrees.
• Excessive Heat and Heat in Connecticut, August 13, 201650 kt wind · 5 eventsOn the morning of Saturday, August 13th, a warm front lifted northward across the region. This allowed a very warm and excessively humid air mass to be in place over the area.
• Heat and Damaging Winds in Connecticut, July 29 to 30, 202550 kt wind · 5 eventsHigh pressure over the region brought a period of hot and humid conditions to portions of northwestern Connecticut on July 29-30, 2025.
• Heat in Connecticut, August 1 to 3, 20064 eventsAn oppressive air mass moved slowly east across the region.Excessive heat occurred mainly from noon to midnight each day for 3 consecutive days. High temperatures ranged from the mid to upper 90s.
• Heat in Connecticut, August 28 to 29, 20184 eventsHazy, hot and humid conditions enveloped the region from Tuesday, August 28th through Wednesday, August 29th. This prompted a heat advisory to be issued both days for all locations below 1000 feet. Maximum heat index values ranged from the low 90's to the low 100's.
• Excessive Heat and Heat in Connecticut, July 19 to 21, 20194 eventsA heat wave gripped northwestern Connecticut from July 19th through the 21st. Temperatures soared to the mid-90s with dewpoints in the low to mid-70s. This resulted in heat index values in the 100 to 110 range in the warmest areas.
• Heat in Connecticut, July 19, 20194 eventsA Bermuda High pumped in a hot and humid and humid air mass northward into the area.
• Heat in Connecticut, July 20 to 24, 20224 eventsA prolonged period of hot and humid weather occurred across northwestern Connecticut during the second half of July. Heat indices peaked between 95 and 103 degrees during the afternoon hours on July 20, 21, 23 and 24.
• Heat in Connecticut, July 16 to 17, 20254 eventsA ridge of high pressure brought a period of hot and humid conditions across northwestern Connecticut on July 16-17, 2025. Maximum heat index values (feels-like temperatures) between 95 and 102 degrees occurred each afternoon.
• Heat and Damaging Winds in Connecticut, July 22 to 23, 202050 kt wind · 3 eventsHeat indices exceeded 95 degrees over southern Litchfield County for two consecutive days on the 22nd and 23rd. In addition, a line of thunderstorms produced a few reports of wind damage during the evening of July 23rd.
• Heat and Damaging Winds in Connecticut, June 23, 202450 kt wind · 3 eventsJune 22, 2024 was the sixth and final day in the stretch of hot, humid conditions. Heat index (or feels like temperatures) reached between 95 and 104 degrees across Litchfield County.
• Heat in Connecticut, June 9 to 10, 20082 eventsUnseasonably hot and humid conditions persisted from Monday June 9th, until Tuesday afternoon on June 10th. Temperatures reached the mid to upper 90s across much of Litchfield County during each afternoon.

Heat everywhereEvery kind of event in Connecticut

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.