We have a beginning of shift meeting with safety being the first thing. Today, I was told it is too hot to ride a bike to work. I told them you only feel it when you stop. 10.5 miles each way. On a normal day I will not even bring water. The last couple of weeks I drink two 20 oz each way. But I never feel the heat until I stop, then it takes about an hour to quit sweating. The high is supposed to be 103 today no telling what the heat index will get to. August is usually worse. 106 was the max without heat index that I have rode in. Where do you call it quits? I only feel it when I stop and I make sure to stay hydrated.