Pacing adjustment for hot weather
This weekend I'll be racing a half marathon where my original target pace would be ~3:39 min/km, which would put me around 1:17:00. However, the current forecasts predict temperatures of up to 27 degrees C, with the temp at the start line predicted to already be at around 24 C.
I'm totally not heat adapted since I've been training through winter, all outdoor running early in the morning. I have also never run a race where temperatures were above 20 C (still relatively new to running, only consistently training for ~1 year). Current mileage is around 110-120 km/w if that's relevant at all.
I'm well aware that my original goal has gone straight out the window. However, I still want to get the best possible result bearing the conditions in mind. How would those more experienced than myself in both racing and hot weather running suggest I change my race plan for Sunday? By how much should I change my starting pace to try to minimize the chances of crashing and burning? Thanks a lot in advance for your suggestions. I'm nervous for the race but looking forward to the challenge!