For Penzance - forecasts at the time of your original post
Tuesday Actual Max 24.7C, forecast 25C
Wednesday Actual Max 26.4C, forecast 23C
The temperature forecasts have been very good lately. I think the discrepancy for yesterday was due to the expectation at the time of more of a N airflow over west Cornwall by daytime Wednesday. In practice, the gentle N breeze of Tuesday dropped out to give near calm conditions and no sea breeze yesterday.
The fresher air has now arrived, but still set to be a lovely warm day.
Prom 09:50
Graham
Penzance