titacgs

This plugin/widget allows you to insert weather status in your sidebar. It connects to World Weather Online to get weather forecasts. It shows the current temperature, max and min. You can choose the temperature scale, options are celsius and fahrenheit degrees. Also, you can get results from 1 to 5 days.
It has a really simple html markup:
<ul>
<li>For one result</li>
</ul>
22 °C
Min 20 °C
Max 32 °C
<ul>
<li>For more than one, displays current temperature and a table</li>
</ul>
22 °C
 Date 
 Min. 
 Max.
 05/22 
 Min 20 °C 
 Max 32 °C
 05/23 
 Min 23 °C 
 Max 33 °C
You can style it by adding the proper CSS for each id to your style.css file: temp_actual, temp_max, temp_min
<a href="http://blog.titacgs.com.ar/world-weather-plugin-para-wp/" rel="nofollow ugc">Visit the plugin page</a> leave questions/comments/fixes.
Also, if you like this plugin <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=QZTRL5AJ35EHG&lc=VE&item_name=World%20Weather%20Plugin&item_number=WP%2dPlugin&currency_code=USD&bn=PP%2dDonationsBF%3abtn_donateCC_LG%2egif%3aNonHosted" rel="nofollow ugc">you can donate some money!</a>

World Weather Widget

This plugin/widget allows you to insert weather status in your sidebar. It connects to World Weather Online to get weather forecasts.

Mat Gargano

statenweb

Easy Weather Widget provides you with an easy to use widget which outputs weather information. When creating the widget just enter in your U.S. zip code and save, it will display the current weather on your site.
I completely rewrote the widget and made it filterable. You need to obtain and enter an API key, which has a free tier that should cover many use cases to obtain at Settings > General in your WP backend. See http://openweathermap.org/api for more information.
The following filters are available:
eww_template to override the output template for the widget, see below for more information.
note, if you are overriding the template, please heed the notice to comply with the OpneWeatherMap license which states <code>the OpenWeatherMap name must be mentioned as a weather source in a visible part of the application.</code> (obtained 8/2016 from http://openweathermap.org/price)
eww_ioc_container to override the IoC container if you want to use different classes in the application (including the API to grab weather data)
<h4>Usage of eww_template filter</h4>
Add a “views” directory and file named “custom-eww.php” to your template directory. The “custom-eww.php” file will be your custom template for this example.
<h4>Example of using a custom template from within your theme PHP 5.3+ which allows closures</h4>
<pre><code> <?php

 add_filter( 'eww_template', function ( $template ){
 $template_dir = get_template_directory();
 return $template_dir . '/views/custom-eww.php';
 } );
 ?>
</code></pre>
<h4>Grunt</h4>
This plugin takes advantage of Grunt for validating JavaScript, SASS compilation and minification. To take advantage of Grunt you have to have both <a href="https://npmjs.org/" rel="nofollow ugc">npm</a> and <a href="http://gruntjs.com/" rel="nofollow ugc">Grunt</a> installed. Visit the respective sites for the applications and make sure they are installed. Once installed, if you want to edit/fork this plugin, it will be helpful to be familiar with these two tools.

Easy Weather Widget

Easy Weather Widget provides you with an easy to use widget which outputs weather information. When creating the widget just enter in your U.S.

World Weather Widget vs Easy Weather Widget