I always feel tougher after running in the summer heat—until I look at my Garmin Forerunner and see it thinks my fitness has suddenly gotten worse. If you, too, watch your Garmin VO2max number slide down as the temperatures climb, you're not imagining it, and you're definitely not alone. Every summer, comment sections and Reddit threads fill up with people convinced their fitness is falling apart, or their expensive watch is broken, or generally panicking about a stat that's supposed to reflect their aerobic capacity. But there’s no need to panic. Your fitness almost certainly isn't going anywhere. What's actually happening is that your body is adapting to heat, and Garmin's algorithm is struggling to separate "hot weather effort" from "declining fitness."
This is why every year, so many runners see their VO2max estimate creep down every summer, only to bounce back once the weather cools off in the fall.
Some Garmin watches account for the heat
If you have one of these newer devices, you may notice the swings are less dramatic than what older models produce. Older Garmins generally don't make this adjustment, which is a big part of why the phenomenon is so widely discussed among long-time Garmin users.
Garmin® Forerunner® 970 $749.99 at Amazon Shop Now Shop Now $749.99 at AmazonThe most direct fix is to change your activity profile settings so that specific activities don't contribute to VO2 max at all. In the Garmin Connect app, you can go into an activity profile and turn off VO2max calculation for it entirely. A popular approach here is to let your road running profile keep contributing to VO2max, since road paces tend to be more consistent and comparable, while turning it off for trail running, where elevation, terrain, and effort variability already make VO2 max less reliable.
Finally, if you really want to keep your VO2 max estimate clean and consistent year-round, you might have to stick to a treadmill in an air-conditioned gym. Controlled temperature and humidity mean your heart rate response will better reflect your actual fitness rather than heat strain, giving you a more stable number to track over time. However, in pursuit of a perfect number, you'll be sacrificing all the mental and physical gains that come from training in the heat. Don't let your VO2max cause you to lose the plot here.
The bottom line
A dropping VO2 max number in the summer is one of the most common false alarms in the running world. It's always troubling to see a fitness score drop, especially for Garmin fanatics like myself. But during the summer, your body is spending energy adapting to the heat, which is its own form of fitness. Whether you decide to ignore the dip, tweak your activity settings, or move your key efforts indoors, the most important thing is not to let a single algorithm-generated number convince you that months of hard training have suddenly vanished.
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