I think there is an app like WeatherBug or something which has an icon that reflects the "current" temperature. Just make the app one of the icons that appears on the homescreen. However, like bettyn100 said, the accuracy may vary.
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WeatherEye is great but as service of The Weather Network (Canadian), there are limited US locations. I have WeatherBug and it's perfect for me. I set up the portal to have two icons, temperature updated every 30 minutes, and another for forecast and (when you roll over it) max/min temps expected. The link is above.
I use the Accuweather pushmark service. It's free, and from what I've seen it's pretty accurate. Go to www.mobile.blackberry.com and follow the links there to set it up.
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I use BBWeather, it may not show it on the screen but I think it takes up alot less memory than the other applications. It's worth a try and a few extra clicks
i downloaded weatherbug, it's exactly what i wanted, BUT, i set the location to my home city, however i'm on vacation in florida and i can't change the location to here. any ideas