Staff photo by Clay Schult Things got sweaty, Monday as temperatures reached 81 degrees Monday and are expected to rise higher Tuesday.

BROWN COUNTY — Even after an early morning rain shower, the National Weather Service had southern Minnesota under a heat advisory Monday that is expected extend through midweek.

In New Ulm, temperatures reached the low 90s Sunday, but dropped to 77 degrees by 10:30 a.m. Monday after rainfall. Temperatures continued to rise throughout the day reaching 81 degrees by evening.

Twin Cities NWS issued an excessive heat advisory for Tuesday, with max heat indices expected to reach 100 for much of southern Minnesota. The maximum heath index forecast for the Mankato area is 98 degrees with low of 84 degrees.

The NWS has not ruled out the possibility of storms Tuesday night or Wednesday morning.

In Minneapolis, the Associated Press reports 14 schools that are not fully air-conditioned will shift to distance learning Tuesday while the city braces for temperatures in the high 90s.

Schools were scheduled to finish on June 10 but a three-week teacher’s strike in April pushed the final day to June 24, to make up for the lost class time.

The high temperatures are forecast to remain in the high 80s through the end of the week.

Brown County, as well as Watonwan, Blue Earth, Martin and Faribault counties, are under a National Weather Service heat advisory throughout the day on Tuesday.

The area includes the cities of New Ulm, St James, Mankato, Fairmont,

and Blue Earth until 8 p.m. on Tuesday.

The impacts of such high temperatures and high humidity can cause heat illnesses to occur, NWS said.The Weather service suggests taking extra precautions during heat advisories, including drinking plenty of fluids, staying in an air-conditioned room and out

of the sun, and checking up on relatives and neighbors.

Young children and pets should never be left unattended in vehicles under any circumstances. Other NWS suggestions include:

•Take extra precautions if you work or spend time outside. When possible reschedule strenuous activities to early morning or evening.

•Know the signs and symptoms of heat exhaustion and heat stroke.

•Wear lightweight and loose fitting clothing when possible.

To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments.

Anyone overcome by heat should be moved to a cool and shaded location — and call 911.