The hyperlocal weather intelligence app that turns every run into the right run — and turns weather into a $1.2B runner-services wedge.
78% of runners have been caught in unexpected weather mid-run. Existing apps forecast cities — not the 5km loop where you actually train.
Existing forecasts resolve to ZIP codes — not the wooded trail behind your house. Runners need minute-by-minute, route-by-route truth.
— 1,204 runner survey · Q1 2025Nimbus blends hyperlocal sensor data, route-grade topography and a runner-specific scoring model into a single "Run Score" — so every step out the door is the right step.
5-min resolution forecasts along your exact route — not your city.
One 0–100 score blending wind, rain, heat, AQI and daylight.
Elevation + shade + wind exposure scored for every saved route.
Auto-detects planned runs and pre-loads the route's microclimate.
Heat, humidity, pollen and AQI blended into the Run Score.
"Storm in 18 min — start now or wait 40."
From a closed beta in Brooklyn to a global community in 22 months. Acquisition is organic-led (79% word-of-mouth) and conversion to Pro is rising every cohort.
"It's the only weather app I open before a run. I've cancelled my other subscriptions."
Capital deploys against three hires and three product bets that turn Nimbus from a great weather app into the operating system for the runner's day.