wttr.in is translated in NUMBER_OF_LANGUAGES languages:

    SUPPORTED_LANGUAGES

Translated/improved/corrected by:

    * Armenian:     Aram Bayadyan @aramix, Mikayel Ghazaryan @mkdotam
    * Azerbaijani:  Dmytro Nikitiuk, Elsevar Abbasov
    * Belarusian:   Igor Chubin
    * Catalan:      Angel Jarabo @legna29A
    * Croatian:     Siniša Kusić @ku5ic
    * Czech:        Juraj Kakody
    * Esperanto:    Igor Chubin
    * Finnish:      @Maxifi
    * French:       Igor Chubin
    * German:       Igor Chubin
    * Greek:        Panayotis Vryonis
    * Icelandic:    Óli G. @dvergur, Skúli Arnlaugsson @Arnlaugsson
    * Japanese:     @ryunix
    * Korean:       Jeremy Bae @opt9, Jung Winter @res_tin
    * Macedonian:   Matej Plavevski @MatejMecka
    * Nynorsk:      Kevin Brubeck Unhammer (https://unhammer.org/k/)
    * Romanian:     Gabriel Moruz
    * Russian:      Igor Chubin
    * Slovak:       Juraj Kakody
    * Slovenian:    B.S.
    * Swedish:      John Eriksson
    * Serbian:      Milan Stevanović @FathVader
    * Swahili:      Joel Mukuthu
    * Turkish:      Atabey Kaygun
    * Ukrainian:    Igor Chubin
    * Uzbek:        Shukhrat Mukimov
    * Welsh:        Daniel Thomas

and many many others.

In the not likely case wttr.in is not yet translated in your language 
you can help with the translation.
Please start with one of the following steps:

    * Open a GitHub issue: github.com/chubin/wttr.in
    * Write an email to igor@chub.in
    * Write PM or tweet to igor_chubin