150 Years of Kentucky Derby Weather: Will it rain on the Kentucky Derby?

Since the first Kentucky Derby in 1875, race day at Churchill Downs has offered one consistent truth: expect the unexpected. Spanning 150 runnings across nearly a century and a half, the historical weather record paints a picture of a spring classic that has tested horses, jockeys, and hat-wearing spectators in nearly every condition imaginable. The unofficial state saying of 'Just wait 5 minutes and the weather will change' holds firm.

Temperatures on race day have ranged from a frigid 47°F to a sweltering 94°F, though the average high of 74°F suggests a generally pleasant late-spring afternoon. The spread between daily highs and lows — averaging roughly 20 degrees — means mornings at Churchill Downs can feel considerably cooler than post time, rewarding those who dress in layers.

RELATED: How weather conditions affect horse racing: rain, wind, and extreme temperatures

Precipitation is a genuine wildcard. Measurable rain has fallen on approximately 40% of all Derby days, with thunderstorms making a notable appearance across multiple decades. The most dramatic example came in 2018, when 3.15 inches of rain fell and Justify splashed to victory on a sloppy track. That sloppy or muddy designation has occurred nearly 20% of the time historically, while a fast track — the most favorable racing surface — has greeted the field about two-thirds of all runnings.

Skies overhead lean partly cloudy on a typical Derby day, with fully clear or sunny conditions appearing in roughly a quarter of all races. Thunderstorm days, while memorable, account for fewer than 15% of the historical record.

For the well-prepared Derby-goer, the data offers one clear piece of advice: a light layer and a rain plan are never wasted investments on the first Saturday in May.

Key takeaways at a glance:

• Race day temps are mild but variable — average high of 74°F, but it's ranged from 47° to 94°
• There's roughly a 1-in-3 chance the track is anything other than "Fast" — so wet-weather gear is worth packing
• Rain on race day is common — measurable precipitation falls about 40% of years
• The most likely scenario is partly cloudy skies around 73°F with a fast track — but Churchill Downs weather loves surprises

What this means for Derby-goers:

• Dress in layers — the swing between high and low on race day averages 20°F, so mornings can be cool even when afternoons warm up
• Pack a poncho — with a 40% rain probability, it's genuinely worth it, not just superstition
• Don't count on a fast track — about 1 in 3 years produces a muddy, sloppy, or "good" track, which can dramatically change race dynamics
• The 70s–80s°F sweet spot covers about half of all race days — a comfortable outcome, but far from guaranteed
   
• Temperature
  • Avg high Range: 47–94°F
  • Avg low Range: 36–72°F
  • Median high 50th percentile
  • Coldest ever 1957 & 1935
  • Hottest ever 1959
  • Fast track 67%
  • Most common Sloppy/Muddy 18%
  • Wet conditions Max rain 3.15"
  • 2018 – Justify wins