How Extreme Heat Affects Your Golf Score (And What to Do)

Summer golf is a different sport. That's not just a feeling -- it shows up in the data. When temperatures climb above 90F (32C), amateur scoring averages rise measurably. And the hotter it gets, the worse the effect.

But here's what might surprise you: the strokes you lose to heat aren't mainly coming from your swing. They're coming from your brain.

Physical fatigue accelerates

In extreme heat, your body diverts blood flow to the skin for cooling, which reduces the blood available for muscles. By the back nine, this shows up as:

• Reduced clubhead speed (2-4 mph decline in extreme heat)
• Loss of balance and lower body stability
• Grip pressure changes from sweaty hands
• Decreased walking speed and general sluggishness

Decision-making deteriorates

This is the bigger factor. Heat stress impairs cognitive function in well-documented ways. On the golf course, that means:

• Poor club selection (defaulting to habit rather than thinking)
• Rushed pre-shot routines (wanting to get back to shade)
• Aggressive play to "get it over with"
• Reduced patience after bad shots

The back nine compounds everything

If normal rounds see a 2-3 stroke drop on the back nine, hot rounds can see a 4-6 stroke drop. Fatigue, dehydration, and mental drain all accelerate in heat, and they feed off each other.

One counterintuitive benefit of heat: the ball flies farther. Hot air is less dense, reducing drag on the ball. The effect is roughly 1-2 yards of additional carry per 10F increase in temperature.

This sounds like good news, but it rarely offsets the scoring damage from fatigue and poor decisions. And it can actually hurt you if you're not accounting for the extra distance on approach shots, flying greens you'd normally hold.

What you eat matters more in the heat:

• Before the round: Eat a balanced meal with complex carbs and moderate protein 60-90 minutes before tee time. Avoid heavy, greasy food.
• At the turn: A banana, energy bar, or trail mix provides quick fuel without sitting heavy in your stomach.
• Avoid: Alcohol before or during the round (massively accelerates dehydration), excessive caffeine, and sugary drinks that cause energy crashes.

Small adjustments to your gear make a measurable difference:

• Wet towel on your neck between shots (the evaporative cooling is remarkably effective)
• Light-colored, moisture-wicking clothing rather than dark colors that absorb heat
• A quality hat or visor -- sun directly on your head accelerates fatigue faster than almost anything else
• Extra gloves -- sweaty gloves lose grip, and grip pressure changes affect contact quality
• Umbrella for shade between shots, even if it's not raining

On extremely hot days (95F+), give yourself permission to score a few strokes higher than normal. This isn't making excuses -- it's being realistic. A 92 in extreme heat might represent the same quality of golf as an 88 on a pleasant day.

The golfers who struggle most in the heat are the ones who refuse to adjust their expectations and press harder when things go sideways. Accept the conditions, manage your energy, and focus on making smart decisions rather than chasing a number.

Extreme heat is a score killer, but most of the damage comes from poor preparation and stubbornness rather than the heat itself. Hydrate aggressively, adjust your strategy for reduced capacity, fuel properly, and accept that hot-day golf is a different challenge. The golfers who respect the conditions instead of fighting them will save 2-4 strokes compared to those who pretend the thermometer doesn't matter.

1. Casa, D.J. et al. "National Athletic Trainers' Association Position Statement: Fluid Replacement for the Physically Active." Journal of Athletic Training, 2017.
2. Cheuvront, S.N. & Kenefick, R.W. "Dehydration: Physiology, Assessment, and Performance Effects." Comprehensive Physiology, 2014.
3. Ball flight distance changes by temperature are based on physics models and golf equipment testing data. Scoring impact estimates are general coaching observations from amateur rounds in hot conditions.