Dan Mossop

The perfect way to show current conditions and a 3-day forcast in your sidebar, for a location of your choice. Great for travel sites, town or city sites, etc. It looks good, takes up little space and is easy to set up.
The widget uses accurate weather data from World Weather Online.
<h4>About the Weather Widget</h4>
The Weather Widget by Calcatraz is a compact WordPress weather widget for your sidebar. It has a neat, neutral design which fits in with almost any site. For the location of your choice (city, town, coordinates, ip address, etc) it shows the current weather conditions on the left and a 3-day forcast on the right.
The widget can display temperatures in both celcius and fahrenheit scales. It can detects the user’s language and shows the appropriate scale, or use a predefined scale. It also allows the user to switch scales, and remembers their preference.
There are now two styles: the default wide style (260 x 58px), and the new square style (133 x 116px) suitable for narrower sidebars.

Weather Widget by Calcatraz

A simple, compact weather widget which displays current conditions and 3-day forecast for the selected location.

Tony Samperi

wp-ng-weather is a simple widget for WordPress, which allows you to put a weather widget in your website, by using a simple shortcode like this:
<blockquote>
[ng-weather api-key=”my-api-key” city=”Bergamo” locale=”it”]
</blockquote>
No coding is required! 
wp-ng-weather is a wrapper for Tony Samperi’s ng-weather (tonysamperi.github.io/ng-weather/), which is an AngularJS Directive. 
Weather data is got from http://www.openweathermap.org, but they need to track api usage. 
So you’ll need your personal API KEY to use this widget, see “Installation” to learn how to get one! 
With a FREE API KEY it’s possibile to make 60 calls per minute.
<h3>parameters</h3>
<ul>
<li>api-key: Your API KEY you got from openweathermap.org. REQUIRED</li>
<li>city: A string with the name of your city. This isn’t required if you set “city-id”</li>
<li>city-id: A string with the ID of your city. This isn’t required if you set “city”</li>
<li>locale: A string with your locale. “en” or “it” are supported at the moment. Default value “en”.</li>
</ul>

WP NG Weather

wp-ng-weather let's you put a weather widget anywhere in your blog

Weather Widget by Calcatraz vs WP NG Weather