I have been looking at the weather map and I do not want to cancel today's trip because the kids would be soooooo disappointed, but we can tweek things a bit. I see on the radar map that it should be raining there by about 11:30. We can still meet at the beach and do the program with the park naturalist at 10:30, but once she is done, depending upon how the maps appear by then, we can visit the nature center for a bit and then find an open pavilion and eat our lunches together under shelter and then call it a day by about 12:30.
If parents wish for their kids to swim and become kidsicles before the rain comes, that's ok too. I know that kids often don't care about temperature as much as we do. At least they can play a bit on the beach sand, swim if parents wish, learn some things about the lake and bugs, learn some more in the nature center, eat a hardy lunch, and feel like they've had a good time on their last day.
Let's do it!