When it gets really hot in midsummer, grabbing a watering can or hose is compulsory. You should preferably water plants in the morning or evening and not in the middle of the day when the sun is really hot. Plants should be watered right at the base and close to their roots - not on the leaves.
Weeds can be removed easily when it's hot. Hoe weeds on sunny summer days with a scuffle hoe, for example, and just leave them lying on the ground. The withered weeds will form an extra layer of mulch for the soil and protect it from drying out. If you do this regularly your garden will soon become a weed-free zone.
Do you like lamb's lettuce? Then now is the time to start planting the seeds. A slightly shady spot is good because the seeds germinate better here than in a sunny location. If you plant lamb's lettuce in the shade of tomatoes, cabbage or runner beans, the lettuce rosettes will be fully grown by the time the vegetables are ready for harvesting.