The best time of day to spray for lawn weeds is when the temperature is between 50 and 85 degrees. Choose a day when the wind is calm and the sky is clear, with no threat of rain. The soil should be moist, not dry.
Liz Ward is a Visual Communications Designer and writer. Ward's articles are published on eHow.com and GardenGuides.com. Ward has written for Demand Studios and Text Broker. She holds a Bachelor's degree in Design and a Minor in photography from Purdue University. She is also a master gardener.