Heat in Maryland

Events

1,010

Deaths

111

Injuries

520

Damage

$10,000

• Heat in Maryland, July 4 to 7, 199915 deaths · 241 injured · 14 eventsHigh pressure sat off the Mid-Atlantic coast from the 4th through the 7th, acting like a heat pump drawing in extremely warm and humid air. Temperatures on the 4th through early on the 7th were oppressively hot, and extremely humid conditions added to the misery.
• Heat in Maryland, July 2 to 4, 200221 deaths · 14 eventsHigh pressure remained stationary off the Delmarva coastline during the 1st week of July. This resulted in a prolonged period of hot and humid weather across the Mid Atlantic region.
• Excessive Heat and Heat in Maryland, July 3, 20189 deaths · 17 eventsAn upper-level high along with surface high over the western Atlantic led to hot and humid conditions.
• Heat in Maryland, July 13 to 19, 19972 deaths · 100 injured · 14 eventsThe combination of antecedent dry weather, a prolonged upper-level high pressure area, and the time of year produced a bona-fide heat wave across much of Maryland during the middle of the month.
• Heat in Maryland, August 1 to 5, 20027 deaths · 14 eventsHigh pressure off the Atlantic Coast pumped hot and humid air into the Mid-Atlantic region. This caused high temperatures to reach between 92 and 100 degrees August 1st through the 5th.
• Heat in Maryland, August 1 to 3, 20066 deaths · 5 injured · 14 eventsExcessive heat conditions occurred on Tuesday, Wednesday, and Thursday, August 1-3, across much of Maryland. Afternoon heat index values ranged between 105 to as high as 115 degrees.
• Heat in Maryland, June 25 to 26, 20026 deaths · 9 eventsVery warm and moist air was ushered into the region by south winds during the last week of June. On the 25th and 26th, temperatures in the mid 90s combined with dew points near 70 to create heat index values between 100 and 110 degrees.
• Heat in Maryland, July 16, 20185 deaths · 3 eventsUpper-level high pressure nearby and surface high pressure to our south and east caused hot and humid conditions.
• Heat in Maryland, August 12 to 19, 20024 deaths · 14 eventsHigh pressure sitting off the Atlantic coastline pumped hot and humid air into the region between August 12th and 19th. Temperatures soared well into the 90s during the afternoon each day and heat index values approached 100 degrees.
• Heat in Maryland, July 18, 20134 deaths · 12 eventsHigh pressure was located over much of the eastern United States and light southerly flow persisted all week which led to above normal temperatures and dew points in the mid 70s.
• Heat in Maryland, July 17, 20184 deaths · 3 eventsA southerly flow caused hot and humid conditions.
• Heat in Maryland, August 16 to 17, 19971 death · 50 injured · 14 eventsWest winds circulating around a "Bermuda" high pressure system allowed temperatures to soar during the weekend of the 16th and 17th.
• Heat in Maryland, August 6 to 10, 20013 deaths · 14 eventsHigh pressure brought ample sunshine and warm southerly winds to the region between the 6th and 10th. Afternoon temperatures soared into the 90s and dew points in the 60s pushed heat indices to between 98 and 112 degrees.
• Heat in Maryland, July 28 to 29, 20023 deaths · 14 eventsA large area of high pressure sat off the Mid-Atlantic coast during the last week of July. This caused a warm and moist south wind to blow into the region for several days, resulting in another heat wave.
• Heat in Maryland, August 22, 20023 deaths · 14 eventsHigh temperatures rose into the mid 90s on the 22nd. With dew points in the lower to mid 70s, heat index values soared to near 105 degrees during the afternoon. Three people died as a result of the excessive heat.
• Heat in Maryland, July 22 to 23, 20023 deaths · 12 eventsAnother round of hot and humid weather occurred across Central and Southern Maryland on July 22nd and 23rd. Heat indexes rose to between 98 and 105 degrees both days. Three people died from heat related illnesses during this time.
• Heat in Maryland, July 18, 20063 deaths · 12 eventsA hot and very humid airmass seeped into the Mid Atlantic on July 17 and July 18. The heat index value climbed to around 105 degrees both afternoons.
• Excessive Heat and Heat in Maryland, July 5, 20123 deaths · 6 eventsUpper-level high provided plenty of subsidence while a southerly flow continued over the area due to surface high pressure off the coast. The subsidence and southerly flow caused hot and humid conditions.
• Heat in Maryland, June 24, 20103 deaths · 2 eventsA strong ridge of high pressure along with plenty of sunshine resulted in hot conditions. Temperatures hovered in the upper 90s to around 100 degrees during the afternoon and early evening hours of the 24th.
• Heat in Maryland, July 4 to 8, 20101 death · 32 injured · 3 eventsA ridge of high pressure aloft along with a southwest flow around surface high pressure resulted in hot and humid conditions during the Fourth of July through the 8th. Max temperatures were in the 90s and 100s across most locations.
• Heat in Maryland, July 30, 200650 injured · 1 eventAbout 50 people were treated for heat illnesses at a Boy Scouts event at Camp Spencer, neat the town of Darlington. The heat index was estimated between 100 to 103 degrees with data from surrounding weather observation stations.
• Heat in Maryland, July 20 to 23, 19982 deaths · 2 injured · 12 eventsAfter an unusually pleasant start to the month, a singular heat wave affected much of Maryland west of the Chesapeake Bay during the climatological peak of highest annual temperatures.
• Heat in Maryland, July 4 to 8, 20122 deaths · 5 eventsThe combination of continued heat and more humidity returned to the Eastern Shore starting on Independence Day and lasted until the 7th in the northern half of the Eastern Shore and the 8th in the southern half of the Eastern Shore.
• Heat in Maryland, August 6, 20182 deaths · 1 eventRidging at the surface and aloft led to hot and humid conditions.
• Excessive Heat and Heat in Maryland, July 20, 20191 death · 17 eventsTemperatures from the mid 90s to the lower 100s combined with dew points near 70 degrees to create dangerously high heat index values.

Heat everywhereEvery kind of event in Maryland

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.