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There's no need to let a few clouds ruin your weed elimination fun.
It all depends on how you define “about”
Roundup® For Lawns is rainproof in as little as three hours, so there’s no need to let a few clouds ruin your weed killing fun. Make sure the temperature is between 45 and 90 degrees Fahrenheit* for best results.
*Do not apply to bermudagrass when daytime temperatures exceed 85 degrees Fahrenheit.