Time to pull out that lawn mower and start cutting back that lawn. Make sure to have a nice sharp blade to help with the cutting progress and check the height of the blade is adjusted correctly.
With the warmer temperatures but still some moisture in the air, growth will be at its best. Keep the lawn regularly mowed to have it looking its best and improve appearance. Aim to mow your lawn around midday, avoiding early mornings as the grass may still be too moist which could damage to your mower or cause the grass to tear rather then cut properly causing ruts. Likewise avoid moving it in the evenings as this will give little sunlight left to help the grass recover from its fresh cut.
Getting how frequently you cut your grass is equally important. Cutting it too often will leave your lawn looking bare and lifeless, where cutting it infrequently will cause it to look overgrown and unkept. Try to aim for once a week or 2/3 times a month during the warmer months.