Your terracotta pots won't dry out so quickly in hot weather if you line them with plastic.
Line a pot with a plastic bag and fill the pot with soil .
Tap the pot to settle the soil then trim plastic bag below the rim. Push a stick up from below into the hole in the pot to pierce the plastic to let water escape
Add plants and add a little more soil. Water well and you will now have happy potted plants which won't need watering so often. This worked for me last year. I hope people in hotter countries than the UK might find this tip useful