Yup, I have the same issue and you are not alone in this. Hot weather drops BG radically in my case too and, I consume lots of fresh water all through the day and night hoping it might help and nothing else like coffee and such.
PWD are more sensitive to high temperatures and humidity and with diabetes one tend to get dehydrated more quickly than people without diabetes. Dehydration can change your blood glucose levels. One may develop a more frequent need to urinate, which compounds the problem. Additionally, high temps can alter how one's body uses insulin. Typically, if you’re exercising, it reduces your need for insulin. But hot weather can throw a wrench into that, and you may be at risk for both high and low blood glucose levels. Adjusting insulin, if need be, to account for the activity level and the weather does normally help.
Humidity, that is the extra moisture in the air can make the heat feel worse. When it’s humid, your sweat doesn’t evaporate as well as it would under drier conditions. That makes it harder to stay cool, and that can make it harder for you to keep your blood glucose levels under control.
Managing your diabetes carefully is the best way to stay on top of the situation.
This is my personal experience;
Drinking plenty of water and avoiding dehydration which is critical, so you’ll want to make sure you’re keeping up your fluid intake. But skipping any kind of other beverages.
Dress for the weather. That means lightweight, loose-fitting clothes to help keep yourself cool, especially if I plan to spend time outside.
Staying in the shade as much as possible.
Summer can be a marvelous time with diabetes too
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