<?php
$timestamp = time();
$token = md5('eternalsun'.$timestamp);

$uuid = "8211637137c4408898aceb1097921872";
$deviceid = "315f0e802b0b49eb8404ea8056abeaaf";

$opts = array(
  'http'=>array(
    'method'=>"GET",
    'header'=>"User-Agent: yandex-weather-android/4.2.1\n" .
               "X-Yandex-Weather-Client: YandexWeatherAndroid/4.2.1\n" .
               "X-Yandex-Weather-Device: os=null;os_version=21;manufacturer=chromium;model=App Runtime for Chrome Dev;device_id=$deviceid;uuid=$uuid;\n" .
               "X-Yandex-Weather-Token: $token\n" .
               "X-Yandex-Weather-Timestamp: $timestamp\n" .
               "X-Yandex-Weather-UUID: $uuid\n" .
               "X-Yandex-Weather-Device-ID: $deviceid\n" .
               "Accept-Encoding: gzip, deflate\n" .
               "Host: api.weather.yandex.ru\n" .
               "Connection: Keep-Alive"
  )
);

$context = stream_context_create($opts);
$file = file_get_contents('https://api.weather.yandex.ru/v1/forecast?geoid=100471&lang=ru', false, $context);

header('Content-type: text/json');
echo gzdecode($file);