Why your cycling power drops in the heat (and how to handle it)
The weather app says 95°F. At 5 am.
Same as yesterday. Same as last week. Until October.
Here’s what’s actually happening, and what to do about it.
Why cycling in the heat feels so hard
If you’re riding in high temperatures, the power drop is real. Once temps push into the 90s, power can drop by around 3–5% or more for the same effort.
It’s because your body’s rerouting blood to your skin to cool you off.
It’s your own personal AC system, which is great for survival. Less great for speed.
And don’t let the headwind fool you. Because you move fast on a bike, your sweat evaporates instantly.
This cooling effect feels great, but it tricks you into thinking you aren’t melting. Your cardiovascular system is working double-time.
how to make your rides bearable(ish)
Ditch the power targets. Ride by Rate of Perceived Exertion or target heart rate instead.
Check in with yourself every 10 minutes.
Stuff a small frozen ice pack into your jersey pocket. Staying cooler means your body doesn’t have to work as hard to manage the heat.
Your heart rate will spike. Your heart is pumping faster just to do all that cooling work.
How to mute your inner critic on hot rides
The heat messes with your head because your inner critic pipes up.
You know the voice. ‘This is stupid. Why am I so slow? I should stop.’
And you’re trying to shut it up. Here’s how.
The critic:“Why am I so slow? I should be able to handle this.”
The mute button: Your body’s doing double duty and working overtime. It’s cooling you down and moving you forward. Of course you’re slower.
The critic:“Everyone else looks fine.”
The mute button: So do you, probably. Heat hits everyone but some are just better at hiding it.
The critic:“I’m weak for backing off.”
The mute button: Weak is ending up in the ER because you couldn’t admit it was hot.
Your inner critic is still going to pop up, but at least now you know it lies.
How to stay hydrated on the bike when it’s hot
Sip every 15-20 minutes, don’t wait until you’re thirsty.
Freeze your bottles halfway and top them off with water. Or water with electrolytes.
Going longer than an hour? You’re also losing sodium, not just water. Add electrolytes because plain water won’t replace what you’re sweating out.
Check your pee. If it looks like apple juice afterward, it’s time to drink more water. Aim for pale lemonade.
When to stop: signs your hot ride has crossed a line
Goosebumps or clammy skin and it’s 90 degrees out
Sweating so much it feels like you stepped out of the shower fully dressed
Flu-level fatigue that stops you mid-ride
Racing heartbeat but not in a “yay, fitness!” way
Feeling woozy and lightheaded
Dizziness when you get out of the saddle, and you didn’t even spin around first
Muscle cramps, nausea, or a headache
Feeling terrible? Step one: Water + shade. Step two: Call your doc if you don’t feel better in an hour.
Thanks, Mayo Clinic, for this list.
How long does it take to get used to cycling in the heat?
It takes about 1-2 weeks to adapt to the heat.
Your body’s not just toughing it out.
By week two, your plasma volume increases, your heart rate settles, and you start sweating sooner, which means you’re already cooling down before the heat peaks.
The heat’s not going anywhere until October. But by week two, neither are you.
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