HAVERHILL (CBS) – Several Merrimack Valley schools will either be closed or have a half day on Monday due to temperatures that are expected to be near 100 degrees.

Lowell public schools will be forced to close on Monday. The high school has regularly been 10-15 degrees above the outside temperature during the day.

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Lawrence and Haverhill schools announced on Sunday that students will be released early to start the week.

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Haverhill students will be dismissed on the half-day schedule that is in place as the region deals with “oppressive heat,” Superintendent of Schools Jim Scully announced on Sunday.

Parents are urged to check school calendars for the specific dismissal details.

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The half day will not impact the last day of school in Haverhill, which is scheduled for Friday.