Water and Weed

With this weather, the main thing is water. Check often, and water enough that the soil is damp below the surface.  It's okay if just the very surface is dry. With containers, you probably have to water every day right now. The ground probably only needs to be watered every other day. You will need to water less if the spot is less exposed, or if you have covered the soil (see the note about mulching below) - or if the weather cools down a lot, or it actually rains, both of which are possibilities in the forecast.

When you water, water twice. Ideally your plants are in a bit of a shallow bowl or trough in the soil, so that when you pour, you can make a little pool. Then when the pool has drained, repeat again. The pool of water creates some pressure to push the water down deeper into the soil. That zone is more protected, and roots will grow into that zone and have access to a more stable moisture level. Even shallow-rooted plant types will grow at least 6 inches down. (Deep rooted plants grow much further, sometimes metres down.)

Also, if your plants are large enough (at least 4 inches tall), you can "mulch", which nowadays means any way of covering the soil. In hot weather you want something that will protect the soil from direct heat of the sun, and so reduce moisture loss by evaporation. Straw and compost are both good hot weather mulches. Spread them out so there's an insulating layer over the soil.

One drawback of mulches is that they protect slugs and snails, so if you know you have a lot of those, you might want to wait until plants are larger (at which point the slugs and snails don't cause much harm).

Although this drought means more watering, it does help control the weeds, which certainly also need water. Still, you probably have weeds to pull out now too, unless you are growing in containers, in which case possibly no weeds have found your plot yet.