SebastianK

This Plugin is very easy to handle. Just install with a few clicks and set it up in your configs. 
Then include it in your sidebar e.g. with the following code:
< ?php spWeatherShow(); ? > (without spaces)

spWeather

This Plugin gets the weather from google.de/google.com and shows the weather now and a 4 days forecast with tiny pics

tuxlog

You are reading the readme.txt file for the wp-forecast plugin. 
wp-forecast is a plugin for the famous wordpress blogging package, 
showing the weather-data from open-meteo.com and/or openweathermap.com. 
please also refer to the terms of usage of open-meteo.com and/or openweathermap.com.
Features:
<ul>
<li>Displays the weather data from Open-Meteo.com and OpenWeatherMap.com 
 at your wordpress pages, posts or sidebar</li>
<li>Displays OpenUV.io data </li>
<li>Let you choose the
<ul>
<li>location (of course)</li>
<li>the time after the weather data is refreshed</li>
<li>the langugage </li>
<li>metric or american measures</li>
<li>windspeed unit </li>
<li>the forecast days </li>
<li>the forecast for up to six/seven days</li>
</ul>
</li>
<li>support wordpress widgets, easy placement 🙂</li>
<li>customize the information you want to show</li>
<li>supports pull-down forecast data to efficiently use space</li>
<li>multiple wp-forecast widget support </li>
<li>integration into your site via css (see below)</li>
<li>comes with an api for wordpress-pro’s 😉</li>
</ul>
Credits:
<ul>
<li>Barbary Jany testing a lot and bring it to valid XHTML</li>
<li>Frans Lieshout 
Wim Scholtes translation to dutch</li>
<li>Luís Reis translation to portugues</li>
<li>Håkan Carlström, 
Susanne Svensso translation to swedish</li>
<li>Gabriele von der Ohe translation to german with entities (for iso-8859-1 or latin1 blogs)</li>
<li>Martin Loyer/Jean-Pierre translation to french</li>
<li>Robert Lang language file for en_US</li>
<li>Detti Giulio/Stefano Boeri translation to italian</li>
<li>Eilif Nordseth translation to norwegian</li>
<li>Michael S.R. Petersen translation to dansk</li>
<li>Jaakko Kangosjärvi translation to finish</li>
<li>Lukasz “linshi” Linhard translation to polish</li>
<li>Castmir & Alejandro translation to spanish</li>
<li>Tamas Koos translation to hungarian</li>
<li>Valeria Pellegrini translation to russian</li>
<li>Valentina Boeri translation to romanian </li>
<li>Roland Geci translation to slovak</li>
<li>Pavel Soukenik translation to czech</li>
<li>Pavel Karnaukhov translation to ukraine</li>
<li>Zoran Maric translation to serbian (latin)</li>
<li>Petar Petrov translation to bulgarian</li>
<li>Udi Burg translation to hebrew</li>
<li>Uli Kozok translation to indonesian</li>
<li>Ali Zemani translation to persian</li>
<li>Amizda Idriz translation to bosnian</li>
<li>Lovrenco Vladislavić translation to croatian</li>
<li>All the others giving feedback about missing features and bugs. 
Thank you very much for your contribution to wp-forecast. </li>
<li>
Weather Icon Font by me Erik FLowers Weather Icons licensed under SIL OFL 1.1
Installation:
</li>
</ul>
<ol>
<li>
Install via the WordPress plugin admin dialog (search for wp-forecast) or
</li>
<li>
Upload to your plugins folder, usually <code>wp-content/plugins/</code>, keeping 
the directory structure intact (i.e. wp-forecast.php should end up 
in <code>wp-content/plugins/wp-forecast/</code>).
</li>
<li>
Activate the plugin on the plugin screen.
</li>
<li>
Visit the configuration page (<code>Options -> WP-forecast</code>) to pick the 
number of widgets, data to display and to change any other option.
</li>
<li>
Visit the Themes/Widgets page to place your wp-forecast widget within 
your themes sidebars or insert it manually and edit your template 
file and put the wp-forecast function where you want your weather 
data to show up. 
Example: <code><ul><li> 
 <?php if(function_exists(wp_forecast)) { 
 wp_forecast( <widget_id> ); 
 } ?> 
 </li></ul></code>
You have to replace <widget_id> with the choosen widget id. 
 For the first widget use wp_forecast(“A”), for the second 
 wp_forecast(“B”) and so on. 
 In most cases it is advisable to put the call into a div environment.
</li>
<li>
Optional 
If you would like to have another set of icons download it 
from <a href="http://accunet.accuweather.com/wx/accunet/graphics_icons.htm" rel="nofollow ugc">http://accunet.accuweather.com/wx/accunet/graphics_icons.htm</a> 
and put it into the wp-content/plugins/wp-forecast/icons folder
</li>
<li>
Optional 
If you would like to change the style, just edit wp-forecast.css 
there are three classes div.wp-forecast for outer formatting, 
table.wp-forecast for the middle part or iconpart and 
wp-forecast-details for everything below the icon
</li>
</ol>
<h3>Translations</h3>
wp-forecast comes with various translations, located in the directory <code>lang</code>. 
 if you would like to add a new translation, just take the file 
 wp-forecast.pot (in the wp-forecast main directory) copy it to 
 wp-forecast_-.po and edit it to add your translations 
 (e.g. with poedit).
Please be aware that the number codes stand for the weather-situations. 
 you can see the mapping in wp-forecast-en_US-en_US.po. there are also 
 the letters N, S, W, E they stand for the winddirections and can be 
 translates either.
To use your own translation, a different one as the default just rename the 
 appropriate file wp-forecast_-.po and 
 wp-forecast_-.mo
To add your translations online at the Translate WordPress project please visit 
 https://translate.wordpress.org/projects/wp-plugins/wp-forecast. This should be the prefered 
 way from now on.

wp-forecast

wp-forecast is a highly customizable plugin for wordpress, showing weather-data from open-meteo.com and/or openweathermap.com.

spWeather vs wp-forecast