Friday looks to be a pretty OK days in Toronto. The trusty forecast models that I am using are in pretty close agreement that rain should not be a factor throughout much of the day at Exhibition Center. I can't entirely rule out a stray shower or two moving through in the afternoon hours, but the risk is rather low at this point. The Canadian weather bureau has a 40% chance of showers and storms, I'm thinking that it will be less than that (about 20%), especially during track activity times. So I'll say mostly cloudy skies with a small risk of an afternoon shower or storm. Afternoon high will be in the lower 70s.
On Saturday, weather will not be an issue at all. It will be a mainly sunny day in Toronto, and quite warm as well. Afternoon high will be up in the lower 80s. Only concern will be getting sunburn. Be sure to pack the shades, hats, and sunscreen.
Sunday is going to be an interesting day at Exhibition Place. Some of the race fans who follow us have been complaining about not having a wet race. Well, there is a decent chance that rain tires will be needed for The Honda Indy Toronto. Both the GFS and NAM-12k are in agreement about a line of rain pushing through at some point during the late morning through the early afternoon hours. Considering that one is showing that the line will be sort of broken in nature, that will keep the chances a little lower in my eyes. With that being said, it will be a cloudy day with a decent risk for showers during the late morning throughout the afternoon hours. The afternoon high will be back down into the mid 70s. I'm pretty close in my thinking for rain chances with the Canadian weather bureau... I'm going 50%, they are going 60%. Either way, if it rains, we're both correct.
I will have radar up and running, but since the race is in Canada, the closest radar is located in Buffalo, I may not have the best geographical information. I am searching for the latest place files for our radar software, so hopefully I can find some that will suffice.