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3. There are some weed killers that will work when the temperature is 45 to 50 degrees F. and above and for 4 to 5 hours after applying. This includes Bonide âSuper Brush Killerâ â a weed killer that, when applied according to label directions, will not hurt bluegrass or turf type tall fescue grass.ome weed killers including Trimec, 2-4-D, Glysophate (Round-up, Kleen-up, and Hi-Yield Killzall II Weed and Grass Killer) do not work to maximum if the air temperature is below 55 to 60 degrees F. when applied and for 4 to 5 hours after applying.
Likewise, the effectiveness of Roundup declines at temperatures above 85 degrees Fahrenheit. The best temperature to apply Roundup is between 60 degrees and 85 degrees.ontrolling weeds with Roundup is best between 10 a.m. and 4 p.m. Even if the temperature is right, do not apply Roundup if rain is expected for one or two hours. Do not apply Roundup at otherwise optimal temperatures if the wind is blowing. Wind can blow Roundup onto your good plants.