Rain Window Finder
Rain chance by hour, next 24 hours
Weather data by Open-Meteo.com (CC BY 4.0)
Tap one button and instantly see the longest low-rain window in the next 24 hours — a clear headline answer, not just a grid of hourly percentages to scan yourself. Works even if you don't grant precise GPS access.
How it works
- Tap "Use my current location" — if you grant GPS access you get a precise result; if not, it automatically estimates your area from your network instead, no permission prompt required
- The best window — the longest stretch of hours with rain chance at or under your threshold — appears as the headline, backed by an hourly chart
- Switch the threshold between Low and Moderate to see how the window changes, live
Frequently asked questions
Is my location sent to your servers?
No — your coordinates are used only to call the Open-Meteo weather API directly from your browser. This site's servers never see them.
What if I don't want to share my exact GPS location?
If GPS access isn't granted or isn't available, the tool automatically estimates your area from your network connection instead (city-level accuracy, no permission prompt) — it's clearly labeled as approximate whenever this happens. You can also enter exact coordinates manually if you prefer.
How is the "best window" calculated?
It finds the longest run of consecutive hours where the rain chance stays at or under your chosen threshold (20% for Low, 40% for Moderate).
Where does the forecast data come from?
Open-Meteo, a free open weather API — attribution is shown at the bottom of the tool per their CC BY 4.0 license.
Related tools
From the blog
Update history
- 2026-08-30 Added: a cover image (rain cloud transitioning to a clear-checkmark stopwatch) — used as the card thumbnail, social share image, and blog title image.
- 2026-08-30 Improved: the hourly chart now has a legend explaining the bar colors, a 0/50/100% y-axis, gridlines, a dashed line marking your chosen threshold, and a rain-percentage label above every 4th bar — previously it was just unlabeled colored bars with cramped x-axis text and no way to tell what the colors or heights meant.
- 2026-08-30 Improved: when precise GPS location isn't granted or isn't available (permission denied, or the device simply can't determine a position — confirmed to happen in some embedded/sandboxed browsers), the tool now automatically falls back to a network-based approximate location (city-level, no permission prompt) instead of immediately asking for manual coordinate entry. The result is clearly labeled as approximate. Manual entry remains available as a final fallback.
- 2026-08-30 Improved: distinguishes why a location request failed (permission denied vs. the browser being unable to determine a position at all, e.g. in some embedded/sandboxed browsers) and shows a specific message for each — for the latter, manual coordinate entry now expands automatically instead of suggesting a retry that won't help.
- 2026-08-30 Fixed: a report that clicking "Use my current location" and granting permission could leave the tool stuck loading — removed the automatic on-load location request (some browsers silently ignore geolocation calls without a real click) and added hard timeouts on both the location request and the weather fetch, so it now always resolves to either a result or a clear, retryable message.
- 2026-08-30 Improved: added a clear "Use my current location" button (with icon) as the primary way to grant location — manual latitude/longitude entry, unrealistic for most people, is now a collapsed fallback link instead of the default view.
- 2026-08-30 Launched: live rain window finder (no button) — one location permission grant finds the longest low-rain window in the next 24 hours as a headline, backed by an hourly chart. Data from Open-Meteo, called directly from the browser (no server proxy needed).