The best places on Earth to see rainbows

Rainbows are not evenly distributed. They cluster wherever sunshine and showers share the sky on a regular schedule, and a few places have turned that weather into an identity. Running Bowcast's model over a full year of historical weather, Honolulu produced rainbow-capable conditions on 64% of days; Phoenix managed 11%. Geography is destiny.

Hawaii: the rainbow capital of the world

Meteorologists have formally argued Hawaii is Earth's best rainbow location, and the mechanics are almost unfair: clean Pacific trade winds push small, well-spaced showers across the islands all day, with sun pouring through the gaps between them. Mountains squeeze extra showers out of the flow, and the remote, dust-free air makes the colors unusually vivid. Morning bows over the ocean are so routine they appear on the license plates.

Ireland and Scotland: rainbow country

The North Atlantic conveyor delivers exactly what a rainbow orders: fast-moving showers with bright gaps between them, all at a latitude where the sun stays low much of the day, keeping the bows tall. The west coasts are best, where showers arrive straight off the ocean.

Waterfall rainbows: the ones you can schedule

Waterfalls make their own rain, so their rainbows obey the sun instead of the weather. On any sunny day, stand with the sun behind you and the spray in front, and the bow is simply there. Each of these has known hours when the geometry lines up:

Island and coastal outliers

Mid-ocean islands share Hawaii's recipe at different latitudes: volcanic peaks, passing showers, and clean maritime air.

When to go, wherever you go

The universal rules travel with you: showery days beat rainy days, the hour after a shower beats the shower itself, and the golden hours beat midday, when the sun is often too high for a bow to clear the horizon. Check the live odds for any of these places, or anywhere else on Earth, on the Bowcast map.