Yahoo Football Weather Forecasts
Display weather forecast for each game from http://www.weather.com/outlook/events/nfl/schedule
Displays the weather forecast for the upcoming game as indicated at http://www.weather.com/outlook/events/nfl/schedule. It will display a weather icon next to the opposing team, and also add a title (tooltip) to the image with details including the high/low temps, chance of precipitation, and expected wind speed. Clicking on the image will take you to the weather.com page for more details.
Updates:
14-Dec-2007 - Modified to include description of conditions (Partly Cloudy, Rain/Wind, etc.) and shortened some text
Example screenshots...
Holding cursor over the image next to the game in NE, shows that the expected high is 35 and low is 16, with expected winds of 22mph and a 70% chance of precipitation:

Green Bay playing in a dome in St. Louis:

Nice day for football in the Coliseum:

Easier to find indoor kickers:

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So, apparently weather.com starts showing the following weeks' game forecasts before the current games have been played (grrrr). I'll have to figure out a better source for the weather info, that stays posted at least through Saturday.
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Good idea Glenn, I'll give it a try.