The iPhone Weather application allows you to quickly view the local weather and a five-day forecast. It shows the forecasted high and low temperature, and a weather icon, such as sunny, or partly cloudy.

You can have several locations in the weather app. Just press and flip to the right or left to move between locations. The dots at the bottom of the screen show how many locations you have, and the white dot shows your position in the locations list.
If you click on the i button at the bottom right, you can see the cities you are following, and click on the button to the left of each to delete them. You can also press and drag the right side of each item to move it up and down in the list. The bottom of the screen allows you to switch your preference between Fahrenheit and Celsius.

You can also click on the + button at the top of the screen to look up another location and add it to the list.

Weather data is provided by Yahoo!.
Posted by Gary Rosenzweig on 2/21/08.
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I have lost my iPhone weather app that came with my iPhone! Can I reinstall it? Which weather app might it be?
Cyndy: How did it get lost? You shouldn’t be able to get rid of the pre-installed apps, these are different than the 3rd-party ones and aren’t in the App Store at all. You shouldn’t be able to delete these on a non-jailbroken iPhone. Your options may be to restore the iPhone (backup, restore, through iTunes) or to simply forget about it and find another Weather app in the store to replace it. Or, bookmark a good weather site through Safari and use that.
I wish I could lose the default iPhone weather app.
My wife and I both have the same I phone and the same weather app. We both have the City of Two Harbors, MN and have noticed that we are getting different data. When it is updated hers will show a temp of 50 degrees and mine will a different number. Do you have any suggestions?
Are you using the built-in Weather app? Or some 3rd-party one? If a 3rd-party app, then contact the developer and see what they say. The built-in app gets weather from Yahoo, I think. Perhaps it doesn’t update that often and you are getting different updates at different times.
I can’t figure out how to get rid of the 2 default cities in the weather program and get the cities that I want into it. I deleted the CA city and put in my city but it wound up on the 2nd set if aps, not on the weather one, where I’d like to know the outside temp and the CA city was back on the front page.
So it shows you have 2 Weather apps? That’s very odd. Try syncing with your computer to see if it clears it up.