How to Plan Garden Watering with Weather Apps

Watering a garden the right amount, at the right time, is the single biggest factor in whether plants thrive or struggle. Most gardeners over-water — partly out of love for the plants, partly because the morning paper said it would be hot, and partly because nobody wants to watch a tomato wilt. The result is wasted water (the average US household pours 30% of household water on the lawn and garden, according to the EPA), root rot, fungal disease, and a higher water bill. Underwatering is the other extreme — a 95-degree week without a soaking and even tough plants like zucchini will collapse.

A free weather app on a phone solves this problem better than any soil moisture sensor or sprinkler timer. Modern apps pull data from National Weather Service radar, hour-by-hour rainfall forecasts, and ground station readings. Three apps stand out for gardeners: the National Weather Service site at weather.gov (the original government source, no ads, totally free), AccuWeather (free with ads, has a 90-day forecast), and Weather Underground or Wunderground.com (uses thousands of backyard weather stations and shows actual rainfall in your specific neighborhood, not just the airport 20 miles away). All three have free phone apps for iPhone and Android.

With one of these apps and a 5-minute morning routine, the gardener can decide before breakfast whether to water that day. The decision is based on three numbers: how much rain is expected in the next 48 hours, the daily high temperature for the next three days, and the wind speed (high wind dries soil twice as fast as still air). A rule of thumb that works for most home gardens is that 1 inch of rain per week from any source is enough — and if the forecast shows that inch arriving in the next two days, watering today is a waste of water.

This guide walks through using the weather app on a phone to plan the week's watering, set up a simple rain alert, and protect plants from upcoming heat waves and late frosts.