About Water Today?

The EPA estimates that up to half of the water used outdoors is wasted by overwatering and evaporation. A sprinkler that runs the morning after a storm is the classic example. This app is the "smart sprinkler" logic, free and in your browser.

How the call is made

1. Your ZIP code becomes a latitude and longitude (Zippopotam.us, falling back to Open-Meteo geocoding for towns).
2. Open-Meteo provides hourly rain for the last 48 hours, the next 48 hours of forecast with rain chances, temperature and FAO reference evapotranspiration (how much water sun and wind pull from the ground).
3. Rules: No if it will stay below 40 °F, if recent rain soaked the root zone, or if ¼ inch or more is likely in the next 24 hours. Probably not if recent plus likely rain covers two days of need. Otherwise Yes, with an amount and the best time of day.

Weekly needs used: lawn and gardens about 1 inch, trees and shrubs ¾ inch, succulents ¼ inch, which are common extension-service rules of thumb.

Offline sample saved 2026-10-24 for New York City, NY 10001.