Sunshine. Showers. A little magic.

Rainbow Hour

A nudge when rain clears under a low sun — the moment skies grow rainbows.

What makes a rainbow

Rain in the air — falling now or recently.
A low sun — between 2° and 42° high.
Bright spells — broken cloud, so sunlight reaches the drops.

Plan today's rainbow hunt

Enter coordinates to calculate today's windows or check the current sky.

Install Rainbow Hour

Use your browser's install menu or “Add to Home Screen” to keep this app on your device.

Alerts use rounded coordinates (about 1 km precision) to time checks. Disable alerts to remove your subscription. Manual sky checks send your coordinates to the weather service through this server; automatic alert checks run on your device.