what is the temperature range for spraying roundup
Ideal Weather. The recommended temperature for spraying Roundup for the quickest results is between 70 and 85 degrees Fahrenheit on a clear day.You may see results on annual grasses within to two to four days and seven or more days for perennial grasses when you apply the herbicide within these temperature ranges.pply Roundup to healthy grass for the best control. Roundup is a nonselective herbicide produced by Monsanto Company. When properly mixed with water it can kill many varieties of plants, including grasses. Weather is one of the factors that can determine the efficacy of Roundup.