UNDATED -- Lots of people are heading to their cabins this weekend for the holiday, but the DNR is warning you about cold water.

Officials say just because the air temperature is warmer, it doesn't mean the water temperatures are ready for swimming. The DNR says for boaters and swimmers, the cold water can prove dangerous or even deadly.

Water temperatures below 70-degrees are considered cold. The temperature on Twin Cities area lakes are still in the 60's, meaning lakes and rivers north of there will likely be colder.

Icy water can cause you to immediately gasp for air and inhale water or even cause cardiac arrest in healthy people.

The DNR says cold water robs the body of heat 25 times faster than air of the same temperature. So, if you are planning on going boating, the DNR is advising you to wear life jackets and avoid alcohol.