Why This Season Matters

Summer is when your lawn faces its greatest stresses — heat, drought, heavy foot traffic, and rapid weed growth all compete to undo months of careful spring preparation. Getting your routine right between June and August determines whether your lawn stays lush and even or ends the season patchy, compacted, and weed-ridden.

The timing of each task is critical. Mowing too short during a heatwave scalps the grass and accelerates browning. Feeding at the wrong time can scorch roots. Watering little and often encourages shallow roots that struggle when the ground dries out. Understanding the summer growth cycle helps you act at the right moments rather than reacting to problems once they take hold. See our Lawn Care Calendar UK for a month-by-month breakdown.

Your Complete Checklist

• Raise your mower blade height to at least 3.5–4 cm during dry spells — Feed and Weed a Lawn
• Water deeply once or twice a week rather than lightly every day — Install a Water Butt
• Treat broadleaf weeds such as dandelions, daisies, and clover with a selective lawn weedkiller — Feed and Weed a Lawn
• Repair bare and patchy areas as soon as they appear to prevent weed colonisation — Fix a Patchy Lawn
• Edge the lawn along borders and paths to keep a clean, defined shape — Garden Guide
• Aerate compacted high-traffic areas with a garden fork or hollow-tine aerator — Scarify and Aerate a Lawn
• Apply a summer lawn feed only when rain is forecast or soil is moist — Feed and Weed a Lawn
• Check for and address waterlogging in lower lawn areas after summer storms — Fix a Waterlogged Lawn
• Remove grass clippings (box them off) in hot spells to prevent thatch build-up — Scarify and Aerate a Lawn
• Inspect and repair any damaged decking or patio around the lawn edge — Repair Decking Boards
• Overseed any thinning areas in late August when soil is still warm but rain returns — Seed a Bare Lawn
• Sharpen or service your mower blade mid-season for a cleaner cut — Garden Guide

Step-by-Step for Each Task

Mowing in summer: Set your mower blade no lower than 3.5 cm during dry or warm weather — 4–4.5 cm is safer during a heatwave. Taller grass shades the soil, retains moisture, and withstands drought far better than a close-cut lawn. Never remove more than one-third of the grass height in a single cut. Mow in the early morning or evening to avoid stress on freshly cut grass in peak heat. Keep the blade sharp — a torn cut browns quickly.

Watering correctly: Water once or twice a week, applying enough to penetrate 10–15 cm into the soil. A quick test: push a screwdriver or cane into the ground — if it meets resistance at 5 cm, the soil is too dry. Water in the morning to reduce evaporation and fungal disease risk. If you have a water butt set up, use stored rainwater where possible; this is softer on grass and reduces mains water use. Note that hosepipe bans can be imposed during drought periods under the Water Industry Act 1991 — check with your water supplier.

Treating weeds: Apply a selective broadleaf weedkiller on a calm, dry day when weeds are actively growing. Read the label carefully — most require the lawn to go unwatered for 24–48 hours after application. For isolated weeds, spot-treat rather than applying across the whole lawn. Do not mow for 3–4 days before or after treatment. For daisy or clover patches, a combined feed-and-weed product applied on moist soil is effective.

Repairing bare patches: Scratch the bare area with a rake to loosen the surface. Apply a thin layer of lawn top dressing or compost, then scatter seed at the recommended rate on the pack. Firm down gently and water in. Keep the area moist until germination — typically 7–14 days in warm summer conditions. Protect from birds with netting if needed. Late August into early September is the ideal window to overseed bare areas, as soil is warm and autumn rains typically follow.

Tools and Materials You’ll Need

• Rotary or cylinder lawn mower with adjustable blade height
• Lawn edging shears or a half-moon edger
• Garden hose with adjustable nozzle, or oscillating sprinkler
• Water butt and collecting kit (if not already installed)
• Garden fork or hollow-tine aerator
• Lawn rake / spring-tine rake
• Lawn top dressing or fine-grade compost
• Grass seed suitable for UK lawns (wear and shade tolerant as required)
• Selective broadleaf lawn weedkiller
• Summer lawn fertiliser (slow-release formulation)
• Watering can with a fine rose head
• Screwdriver or moisture probe (for soil depth moisture testing)
• Protective gloves

Common Mistakes to Avoid

• Scalping the lawn in hot weather: Cutting grass too short removes the leaf area the plant needs to photosynthesise and exposes soil to direct sun, dramatically increasing moisture loss and browning. Raise the blade before a heatwave, not after.
• Watering little and often: Shallow, frequent watering encourages grass roots to stay near the surface, making the lawn far less drought-resistant. Deep, infrequent watering — enough to soak 10–15 cm down — trains roots to grow deeper where soil stays cooler and wetter.
• Feeding on dry or scorched ground: Applying a granular fertiliser to drought-stressed or bone-dry soil risks burning the already-stressed grass. Only feed when the soil is moist or rain is reliably forecast within 24 hours.
• Leaving clippings on the lawn during dry spells: In hot weather, a thick layer of clippings creates thatch, traps moisture against the surface, and promotes fungal disease. Box off clippings from June to August and remove them from the lawn.
• Ignoring bare patches: Small bare areas left untreated quickly become weed patches. Address them promptly — a quick patch repair takes minutes, whereas re-seeding or re-turfing a weed-colonised patch takes weeks. See our guide on how to fix a patchy lawn for a step-by-step approach.