I can't call this "official" because I am no authority.
All we have so far are long-term forecasts, which mean nothing and are little more than a historical average with some actual forecasting baked in. The closer we get to race day, the more accurate it will be.
weather.com: hi 55 / lo 41
accuweather.com: hi 53 / lo 43 / considerable cloudiness
Both would be fine, and both mean nothing. But one can hope.
Any other weather prognosticators/obsessives?