weather: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/weather - from package: expect

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/weather - from package: weather-util

You may install the required package with command apt-get install {package}

Error in other languages:
weather: bevel nie gevind nie
weather: comandă negăsită
weather: comando não encontrado
weather: commande introuvable
weather: command not found
weather: käsku ei ole
weather: không tìm thấy lệnh
weather: komanda nerasta
weather: Kommando nicht gefunden.
weather: kommandot finns inte
weather: komut yok
weather: nie znaleziono polecenia
weather: níor aimsíodh an t-ordú
weather: no se encontró la orden
weather: no s'ha trobat l'ordre
weather: opdracht niet gevonden
weather: parancs nem található
weather: perintah tidak ditemukan
weather: príkaz nenájdený
weather: příkaz nenalezen
weather: команда не найдена
weather: командата не е открита
weather: 命令找不到
weather: コマンドが見つかりません