At this point in the dog days of summer, you’ve probably noticed that even your easy runs feel harder. This time of year brings high temperatures, humidity, and plenty of sweat, making it difficult to maintain your normal pace.
The good news? That’s completely normal!
Your body works hard to regulate its temperature during exercise, and understanding how heat, cold, and other environmental conditions affect you can help you train smarter and stay healthy all year long.
Female Thermoregulation
Women regulate body temperature a little differently than men due to differences in hormones and body composition.
- Women generally sweat less than men, which can make cooling less efficient during long or hot runs.
- During the second half of the menstrual cycle, progesterone raises core body temperature slightly, making hot-weather runs feel more challenging.
- Perimenopause and menopause can also affect temperature regulation, making exercise in the heat feel less comfortable.
These differences simply mean that hydration, pacing, and recovery become even more important.
Heat, Humidity, and Hydration
Humidity often has a bigger impact than temperature alone because sweat cannot evaporate as easily. As a result, your heart rate rises, your body retains more heat, and your usual pace may feel much harder.
Instead of chasing a specific pace, it is recommended to run by effort or heart rate on hot days.
Hydration is equally important. Even mild dehydration can reduce endurance performance and increase the risk of overheating.
A few simple strategies include:
- Start your run well hydrated.
- Drink fluids consistently throughout the day.
- Include electrolytes during runs lasting longer than 60–90 minutes.
- Replace fluids after longer workouts.
Hydration needs vary for every runner, so use your thirst, sweat rate, and training conditions to guide your plan.
Know the Warning Signs
Stop running and cool down if you experience:
- Dizziness
- Headache
- Nausea
- Chills despite feeling hot
- Unusual fatigue
- Confusion
Listening to these early warning signs can prevent more serious heat illness.
Your Body Adapts
The encouraging news is that your body becomes better at handling heat with regular exposure. Over 1–2 weeks of training in warm weather, you’ll typically begin sweating earlier, cool more efficiently, and notice your heart rate staying lower during similar runs.
Cold Weather Matters Too
Cold temperatures create different challenges. Muscles may take longer to warm up, and runners often drink less because they don’t feel thirsty—even though hydration still matters.
Dress in layers, allow extra warm-up time, and continue drinking fluids during winter training!
Train With the Conditions
Weather is simply another training variable. Whether it’s heat, humidity, cold, wind, or poor air quality – something we’re learning too much about this year – don’t be afraid to adjust your pace, shorten a workout, or move indoors when conditions are unsafe.
The strongest runners aren’t the ones who ignore the weather—they’re the ones who adapt to it. By listening to your body and training wisely, you’ll stay healthier, recover better, and keep running strong through every season.