As Connecticut endures temperatures in the 90s this week, some schools are planning to dismiss their students early.

All Danbury Public Schools will have early dismissal Tuesday, the district said in a Facebook post. Danbury High School will dismiss at 10:30 a.m., while the middle schools will let out at 11:10 a.m. Early elementary schools, which start at 8:25 a.m., will get out at 11:50 a.m., and late elementary schools that start at 8:55 a.m. will dismiss at 12:20 p.m.

All special education pre-school classes are canceled and there will be no extended learning programs, Danbury Public Schools said. All school readiness classes will remain open until 5 p.m.

“At this time, early dismissal is only scheduled for Tuesday,” the district announcement said. “We will send additional notifications tomorrow if we feel the need to dismiss early for additional days this week.”

Litchfield Public Schools, or Regional School District No. 6, switched to an early release schedule Tuesday after building temperatures approached 80 degrees by 8 a.m.

Students at Newtown Public Schools will get out three hours earlier than usual on Tuesday, Wednesday and Thursday due to the forecast, which is calling for "increased heat and humidity," the district said in a Facebook post.

Henry Abbott Technical High School in Danbury is closing early Tuesday — at 10:30 a.m. — due to the anticipated high temperatures, the school announced on X, the platform formerly known as Twitter.

In Portland, Valley View Elementary School, Gildersleeve Elementary School and Brownstone Intermediate School will dismiss at noon Tuesday, the district said in a Facebook post. The district has canceled afternoon pre-kindergarten at Valley View Elementary School and Kids Korner.

Since Portland Middle School and Portland High School are air-conditioned, grades 7 through 12 will operate on a regular, full-day schedule, the district said. There may be changes to the athletic schedule, which will be communicated by the schools' administrations.

"We recognize these alternations to the normal schedule are a significant disruption," the district said. "Decisions to alter our schedule are made in our students' best interests and only after careful deliberation with our facilities department, building leaders, medical professionals, and student support services. We will carefully monitor the environment in our facilities and return to a normal schedule as soon as the conditions permit."

In Thomaston, all three of the district's schools are dismissing early Tuesday due to the heat. High school students will let out at 11:25 a.m., students at Thomaston Center School will be dismissed at 12:15 p.m., and students at Black Rock Elementary School will be dismissed at 12:25 p.m., the district said.

The National Weather Service said the region is in store for high temperatures and humid conditions Tuesday and Wednesday. Heat indices could get up to 100 degrees, while air temperatures might max out at 90 to 95 degrees.

"There is an increased risk of heat-related illness for vulnerable populations with this event," meteorologists said in a bulletin Monday afternoon.

In Connecticut, the heat indices for Tuesday range from 91 degrees in New London to 97 degrees in Hartford and Waterbury. The National Weather Service has issued a heat advisory for Hartford County Tuesday from noon to 8 p.m.

"Hot temperatures and high humidity may cause heat illness to occur," the weather service warned. Meteorologists advised residents to drink plenty of fluids, stay in air-conditioned rooms, stay out of the sun and check up on relatives and neighbors. Children and pets should not be left alone in vehicles under any circumstances.

Anyone working or spending time outside should take extra precautions and, if possible, reschedule strenuous activities to the early morning or evening, the weather service added. Those performing outdoor work should take frequent rest breaks in shaded or air-conditioned areas.

A hazardous weather outlook also warns of hot and humid conditions in northern Connecticut, including Litchfield, Tolland and Windham counties, on Tuesday through Thursday as heat index values could reach the mid-90s. The weather service said it may issue a heat advisory for some areas.