It is important to water your plants first thing in the morning.
Heatwaves can quickly draw the moisture out of the soil and dehydrate shallow roots.
Watering early in the morning will ensure the roots of your plants are sufficiently hydrated before the moisture-wicking heat sets in.
This will also help prevent heat stress.
In times of high heat, you may want to consider another water afternoon to ensure your plants don’t dehydrate.