When to keep kids in during the hot water

[TheSoapyFrog]

My boys are 6 and have the hump with me because I won't let them outside to play as it's too hot (35 degrees) and little shade in the garden. One of my boys has severe learning disabilities as well as autism and will not wear a hat or sunglasses.
I'm not planning on letting them back out today as it will still be around 33-34 until about 7.
Am I being a bit harsh? Should I let them out after 3pm when the sun apparently isn't as powerful?
They're both fair with reddish hair and will definitely have a lot of suncream on?
What rules are you following?

And by hot water I mean hot weather!!!

I think the refusing to wear hats would be my main concern but blathered in suncream after 3/4pm I would maybe do it.

Mine are hiding in the house and are older and having a chill out day (ie glued to screens) - but we will be going out later..... sun cream and lots of water if they want to go out - maybe a bit of time outside and then back in for a bit to cool down?
Do what you are comfortable with - but as long as they are hydrated and not burning then I think it’s ok? We sort of have a general no sun cream after 4 needed .... but then we have good sun skin that doesnt burn easily.

I grew up in Australia with very hot, dry, and sunny summers. As a child I wasn't allowed out when the sun was strongest (12noon-2pm) but it was fair game before and after that! Lots of suncream and water though.

I live in a country where in summer it is regularly over 35 degrees. Generally no kids are out after 10am and they start playing out after 3pm. They are inside in the aircon. The sun is harsh.

When they are out (before 10 etc) it's hats and sunscreen, t-shirts all the way.

We do lots of water play, sprinklers, sometimes a slippery slide in the garden - all under shade.

Plenty of cold water, ice blocks, watermelon, frozen berries etc.

Heat exhaustion can creep up very quickly and while I have no advice for children that may have sensory processing issues this is just what we tend to do to manage. It is still very stiffiling.

I think you are doing the right thing right now. Whether you let them out a little bit later on is up to you, its isn't clear cut

YANBU.
We don't have anything like enough shade in our garden so we are not hanging out there today!
I took DS out to a shady park this morning, we were out 10-11.15am which was the latest I wanted to leave it, and we've been at home indoors since then. Curtains are closed on the sunny side of the house and we have an air con unit running (thank god!) TV for now and we will play indoors afterwards.
If he really wants to go in the garden from about 4ish I will let him but insist on hat and sun cream, if he refused it then I wouldn't let him outside.
The last boiling hot day (last Friday I think) I spent ages setting up the paddling pool but he didn't play in it for long!