The app also features an interesting pay model: when you buy the U.S $2.99 app, you get 30 days of push notifications for free. Then it's $0.99 for the notifications every three months. Notifications include letting you know if rain is in the forecast, the UV index when it goes above a set level, a warning if the temperature goes below your preference, and a notification that the weather is OK to wear a T-shirt.
There are a few things that would make this app better. First, it'd be nice to reduce the need to flick the screen so often. The five-day forecast could be placed on one page, not five. And the notifications are unique, but a bit strange. I'd much rather be notified of upcoming storm warnings rather than T-shirt weather, but there is no such option -- especially since the notifications are so pricey (getting them for a year costs more than the app itself), it'd be nice to have some more options. And if you want weather from a different location, you have to enter that location manually. There is no list of favorites.
I think weather junkies would be better off with the Weather Channel app [iTunes link], which is free, Weather Channel Max for $3.99 [iTunes link], or MyWeather [iTunes link] mobile which provides very detailed info for a one-time $4.99, and includes (free) push notifications for severe weather. There is some clever thinking behind Outside, and it's a fresh approach to a function that's seen its share of rainy days. But I wish it had more information on the individual screens, and it wasn't so expensive to get notifications.