The lawn-watering weather app
Knowday reads the soil, the rain, and how fast the lawn's drying — then gives you one straight answer instead of a guess: water now, or save it.
Today · your lawn
What matters when you water
Is the lawn actually thirsty?
Knowday models the soil moisture near you. Dry through the root zone and you get a plain Water; still holding plenty and it says Wait — watering wet soil risks rot and runoff.
Don't water before the rain
The smartest watering is the watering you skip. Knowday watches the next day's forecast and tells you to hold off when rain's on the way — and calls a hard no before a downpour.
Don't water after the rain, either
It also looks back: if rain fell in the last two days, the lawn's already had its drink. Knowday suppresses the watering nudge so you're not double-soaking the roots.
How fast it's drying out
On a hot, windy day a lawn dries far faster than a still one. Knowday reads the drying demand and flips to Water sooner when the grass is racing to dry out.
How it works
This is an action, not a readout — Water, Wait, or Check first when the signal's thin. It scores how dry the soil is, how fast the lawn's drying, and both whether rain just fell *and* whether it's coming, then leans toward saving water when nature's handling it.
Two honest limits: it's all modeled near you, not measured in your yard, and it can't see your sprinkler or rain barrel — this is the lawn's *need*, not a tally of what you've already given it.
Watering the lawn is one of fourteen plans Knowday reads — walks and rides, the lawn, the garden, camping, the night sky, and the water.
See all plansNo catch
Free to use. No sign-up. Your location is only used to fetch your forecast.