Designed for people who use their blog while travelling the planet, Weather Traveller allows you to add weather information to the bottom of your posts in an easy way. This means you can let your blog readers know what the weather is like in the location you specify at the time you post.
I got the idea from Weather Postin’ by Matthew Richmond (https://wordpress.org/extend/plugins/weather-postin/)
Requires WP Geo (http://www.benhuson.co.uk/wordpress-plugins/wp-geo/).
<h4>Features</h4>
<ul>
<li>Show weather details for a specified location.</li>
<li>Edit weather details (such as location) prior to saving.</li>
<li>Does not change the original post content.</li>
</ul>
<h3>License</h3>
This program is free software; you can redistribute it and/or 
modify it under the terms of the GNU General Public License 
as published by the Free Software Foundation; either version 2 
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, 
but WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
GNU General Public License for more details.
http://www.gnu.org/licenses/gpl.html

Weather Traveller

Add weather details to your post based on location specified. Requires wp-geo plugin.

theozero

This plugin is extremely simple, and intended for someone who wants to add geocoding to their blog, but without the bloat of a big fat plugin. This lets you tag each post with a location (description, latitude, longitude) which can then be used in your custom theme.
This plugin also provides a feature to track of a single location not associated with any posts. This is useful in order to create a “Where Am I?” feature on your blog where you control the level of detail (just to share the city, rather than pluggin in foursquare data). This is especially nice if you’re running a travel blog or a website for some kind of tour.

EasyGeo

Adds simplest geocoding features to WP posts (description, lat, long). Adds nothing to the front-end, but has tools for you to do so in your themes.

Weather Traveller vs EasyGeo