Mowing your lawn in hot weather requires careful timing to prevent yellow, weak grass. According to George Davies Turf & Stone, the ideal window is late morning, between 10am and 12pm. This timing helps grass recover from the stress of high temperatures and reduces moisture loss.
Why Late Morning Mowing Works
George Davies Turf & Stone explains: “The grass blades tend to be drier during this time, so the cut will be cleaner, and the clippings will mulch more efficiently.” The morning dew acts as a natural lubricant, allowing mower blades to glide smoothly, while lower temperatures place less stress on the lawn. Mowing at midday should be avoided because the heat puts extra strain on the grass, increasing the risk of yellow patches and weakening the turf.
Evening Mowing Risks
Late-afternoon and evening cuts are not advisable. If you must mow then, allow enough time for clippings to dry before nightfall to prevent fungal diseases. Wet clippings left overnight can create a breeding ground for pathogens that damage the lawn.
Mowing Frequency During Heatwaves
To keep your lawn healthy, mow at least once per week during the active growing season. However, during hot, dry periods or when growth slows, reduce mowing to every 10 to 14 days. The Royal Horticultural Society (RHS) recommends mowing once a week on average, dropping to once every two weeks during drought. Flower-rich lawns can be mown every four to six weeks, while long-grassed lawns are best cut once or twice over the summer, but not usually before June.
Additional Tips for Summer Lawn Care
Yellow patches and weaker grass do not mean the lawn is dead, but it is best to avoid them. Proper mowing timing, combined with adequate watering and avoiding foot traffic during peak heat, can help maintain lush, green grass even in a heatwave.
