in the evening around 7pm when the sun is cooling down or early in the morning. If you have to water during the day you must be careful not to splash the leaves of your plants with water....it can cause them to burn. Sometimes hanging baskets or pots need watering twice a day in hot weather....so go for first thing in the morning.....around 8am and evening time around 7pm......hope this helps.....happy watering!

I agree best really in the evening as then the water gets to soak into the soil overnight