A Met Office Amber Heat Alert is now in force for the Isle of Wight.
It's expected to last until midnight on Tuesday (19).
The Met Office is warning of "some exceptionally high temperatures" both in the day and in the night.
Initially, the warning was just for today (17), before it was extended to Monday (18).
It is now in place to cover Tuesday too.
Islanders are told to expect temperatures in the 30s.