Yeah, it's been a hot week. On Thursday, June 10, the mercury reached 97* in Waterloo. The last time the air temperature reached that mark in Waterloo was May 27, 2018.

Thursday's heat index reached 99*, the highest of the year so far. In 2020, Waterloo was subject to 38 hours of Heat Index temperatures over 100*. 

Seven of the past eight days (6/4-6/11) have had high temperatures in the 90s in Waterloo.

6/4:  91*
6/5:  93*
6/6:  89*
6/7:  92*
6/8:  91*
6/9:  94*
6/10: 97*
6/11: 90+*

Iowa Environmental Mesonet
Iowa Environmental Mesonet

Waterloo averages around 124 hours per year with air temperatures above 90*. So far in 2021, the city has already had 68 hours above 90*. (as of 6/10)

Iowa Environmental Mesonet
Iowa Environmental Mesonet

June 2020 had a total of five days with high temperatures of at least 90*. There have already been seven days this month over 90*. (including Friday 6/11)

Waterloo has had nine consecutive days with a high temperature over 89* and that streak could continue for at least another week.

The record for most consecutive days with a high temp over 89* in Waterloo is a whopping 37 in 1921 (6/15-7/22)

The record for consecutive days over 90 in Waterloo is 21 in 1921.


Don’t wait till you’re thirsty to drink. By the time you feel thirsty, you’re already slightly dehydrated.

Eat water-rich fruits and vegetables, like Watermelon, strawberries, cantaloupe, peaches and pineapples, cucumbers, radishes, celery, zucchini, and tomatoes.

Oatmeal is also very hydrating. When oats are cooking, they expand and absorb the water or milk they’re being prepared with.

Dress for the weather. Wear light, loose-fitting clothing. Dark colors absorb heat.

Wear a hat!

Apply sunscreen!


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