The half marathon on Friday night/Saturday morning promises to be cold. Here's the Kissimmee forecast, which should approximate the weather at WDW:
Low: 33°F RealFeel®: 26°F
Mostly cloudy and colder with showers
... leading to a Saturday of:
High: 44°F RealFeel®: 32°F
A bit of rain and sleet in the morning; otherwise, cloudy, breezy and colder. It appears likely to rain at 8am, when the temp should be 36 degrees (no snow).
Then, Saturday night, when the full marathon folks wake up and stand around the epcot parking lot:
Low: 26°F RealFeel®: 11°F
Clear and colder; breezy late; watch for a hard freeze
Um, ouch. The rest of Sunday says:
High: 50°F RealFeel®: 41°F
Windy and very cold with times of clouds and sun
Good running weather, on the one hand. I will be volunteering and thus standing around. Pity me, instead!! :)