RUNNING CONDITIONS
How should I run in hot weather?
Slow down in the heat and adjust the run to the conditions
Choose cooler conditions when possible, shorten or slow the run, and keep a practical way to stop and cool down. Your usual cool-weather pace is not a target you must defend in the heat.
Change the plan before leaving
Look at the forecast and local heat alerts rather than only the time on the clock. Shade, humidity, direct sun and airflow affect the experience. Early morning may be cooler, but that is a local condition to check rather than a guarantee.
Pick a route with shorter loops, access to water and a way home. Tell someone your plan when appropriate. Moving the run indoors, replacing it with an easier activity or taking a rest day is a valid response to unsuitable conditions.
Use effort rather than a fixed pace correction
There is no universal number of seconds per kilometre to add for every temperature increase. Your recent exposure, the route, duration and conditions vary. Start conservatively and be willing to shorten the outing.
Imagine an easy route normally takes 30 minutes but today’s comfortable effort produces a slower pace. Extending the run until the usual distance is complete adds more time in the heat. Choosing the original time limit instead may better match the intention of a short easy outing.
Make the practical details explicit
| Decision | Concrete check |
|---|---|
| Timing | Forecast and local heat guidance checked |
| Route | Shade, short return options and cooling access |
| Duration | A shorter option agreed before starting |
| Drinking | Water access matched to the outing |
| Exit plan | Phone or another way to get help if needed |
Follow an appropriate hydration plan without forcing excessive fluid. Drinking does not make severe heat safe, and it is not a substitute for reducing exposure or stopping when symptoms develop.
Take illness signs seriously
The CDC lists headache, nausea, dizziness and weakness among signs of heat exhaustion. Stop, get to a cool place and seek medical help rather than attempting to finish the route. Confusion, collapse or altered consciousness in the heat is an emergency: call the local emergency number and begin cooling while help is on the way.
Stay with an unwell person. Do not wait for a watch alert or assume that sweating rules out serious heat illness. If you have a condition or take medication that affects heat tolerance, ask your clinician about appropriate precautions before exercising in hot conditions.
Keep conditions with the activity record
A slower hot-weather run should not automatically be interpreted as lost fitness. Compare outings with their context: duration, route, weather and how they felt. A pace-only comparison can miss the reason you sensibly changed the session.
In Runome, review the available activity data alongside notes about conditions. Metrics can help describe the outing afterward; they cannot diagnose heat illness or tell you it is safe to continue. The next useful decision may be recovery and a cooler session, not trying to recover the missed kilometres.