Maine, New Hampshire Severe Extreme Heat Warning | Effective 06/30/2026 10:57

Headline: 
Extreme Heat Warning issued June 30 at 1:57PM EDT until July 3 at 8:00PM EDT by NWS Gray ME
Event: 
Extreme Heat Warning
Urgency: 
Expected
Effective: 
June 30, 2026 - 10:57am
Expires: 
July 1, 2026 - 1:00am
Description: 
* WHAT...Dangerously hot conditions with heat index values up to 110 expected. * WHERE...Portions of southwest and western Maine and central, northern, and southern New Hampshire. * WHEN...From 11 AM Wednesday to 8 PM EDT Friday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Overnight low temperatures will only fall into the 70s, resulting in accumulated heat stress.
Instruction: 
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke.
Area Description: 
Southern Oxford; Interior York; Central Interior Cumberland; Androscoggin; Coastal York; Interior Cumberland Highlands; Northern Carroll; Southern Grafton; Southern Carroll; Sullivan; Merrimack; Belknap; Strafford; Cheshire; Eastern Hillsborough; Interior Rockingham; Coastal Rockingham; Western And Central Hillsborough
Forcast Office: 
NWS Gray ME