When is the best time of the day to water my lawn with a sprinkler system?

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Early morning is the best as evaporation will be less than in the afternoon. Evening watering is discouraged as it can lead to lawn diseases. The 150 rule is when day temperatures and humidity added together equal 150, which is a rule of thumb that your lawn is most susceptible to lawn diseases and water on the grass plant overnight from a sprinkler system acts like a catalyst to start a disease. The summer of 2010 had a tremendous amount of rain storms that happened during the evening followed by high day temperatures and humidity, resulting in the highest amount of observed lawn diseases throughout the area in many years.

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