How hot is too hot to run?

Run super early if you aren’t already. Otherwise don’t be a snowflake, I know libs that can run in hotter temperatures

I've done 200m reps in 100 degree heat. I was hiding under the bleachers drinking water between reps. I wouldn't attempt any steady running above about 85.

Lived in Bangkok for many years. Ran about 95% of my runs in local parks. I got very used to running in hot & humid conditions.

120 F exactly

"How hot is too hot to run?"

It depends on a multitude of factors such as pace, distance, humidity, heat-acclimatization status, sun intensity, availability of hydration, and heart rate response, just to name a few.

You've got to take all those into account before you can answer the question for yourself.

Where I live, early am running is a must, since even then, temps can be 78-82°F with near 100% humidity, even before sunrise. Later in the day, it can be downright dangerous.

While living in Stockton, CA I found that 105 Fahrenheit was my limit. I can run in hotter whether, but it is absolutely miserable and I'd rather just not. Working in a non-air conditioned factory that held the summer heat well broke my previous notions of "too hot."

Something for you and others to try.

I'm fortunate to live nearby a state park that has paved trails with shade and mile markers every half mile. However on very hot and humid days it still can be insufferable. So for my easy run days, I'll run a half mile, rest and hydrate for 30 seconds.

Before I started doing the above, I could run 4/6 miles before suffering from the conditions. Once I started taking 30 sec. breaks with hydration I found I could get in 8/10 miles easily without heat/humidity repercussions. A 30 sec.brake every 1/2 mile on an easy run won't hurt your workout at all. In fact it might save you, especially if you're a stubborn runner.

I remember running for two hours on a 100 degree day. It wasn't that bad. But it was not humid.

Ran 8 miles at noon today. 85 degrees, sunny and 71 dew point. I take it slow, with one water stop about 5 miles in.

It will be much worse here in a month. I’ll need to run very early, but dew point will still be 73-75.

Not sure. But I recall doing a 4 mile tempo run in 20 min a few years back. In 95 degree heat. Heat doesn't phase me.

It all depends, I’ll do short repeats with water in 100+, 3-4 mile easy jogs feel tolerable for me up to 100, long runs and bigger workouts I’d rather be under 90, I feel like my pace starts noteably suffering around 80-85

I ran in Cyprus when they were near their heat record. It was about 45C (113F). It was hideous. When I got back I had to lay down on cold tiles and I didn't dare jump in the swimming pool, that is how bad I felt!

I would say that is too hot to run.

Having said that, people run in a lot of places when it is that hot.

Awww internet tough guy is actually a pu$$y ass snowflake

I'm heat acclimated, but feel that above 95F, under the sun is too hot.

In S'pore, 95F feels like 107F, due to humidity. That's peak mid-day temperature.

People mostly run before dawn and after sunset here.

whatever Athing Mu's temp is, cause she's clearly too hot to run

probably 98-99F?

When you are dog gam fit and hydrated

100 isn’t bad in a dry place . That’s what sweats for .

In addition to all that's been mentioned, some people don't acclimate to heat very well so it's best to determine what you personally can handle and don't run above that level.

Once you get heat exhaustion (or worse, heat stroke), you lose even more ability to handle hot weather. It's not a matter of toughing it out. And it's not a matter of being okay once the workout is over. I have a friend who did a track workout with our group on a very hot evening. We went out for beer and dinner afterwards and he was okay, but around midnight, he had a reaction and had to be taken to the ER. Had his wife not been an ER nurse and recognized the signs, he might have died.