百度提供天气预报查询接口API，可以根据经纬度/城市名查询天气情况，我们可以在微信公众平台开发中调用这一接口。
接口说明
根据经纬度/城市名查询天气的结果
接口示例
http://api.map.baidu.com/telematics/v3/weather?location=北京&output=json&ak=5slgyqGDENN7Sy7pw29IUvrZ
接口参数说明
| String | location | true | 输入城市名或经纬度，城市名称如:北京或者131，经纬度格式为lng,lat坐标如: location=116.305145,39.982368;全国值为all,返回省会城市自治区，港澳台天气情况多城市天气预报中间"|"分隔,location=116.305145,39.982368| 122.305145,36.982368|…. |
| String | output | false | 输出的数据格式，默认为xml格式，当output设置为’json’时，输出的为json格式的数据; |
| String | coord_type | false | 请求参数坐标类型，默认为gcj02经纬度坐标。允许的值为bd09ll、bd09mc、gcj02、wgs84。bd09ll表示百度经纬度坐标，bd09mc表示百度墨卡托坐标，gcj02表示经过国测局加密的坐标。wgs84表示gps获取的坐标。 |
返回结果
| currentCity | 当前城市 | 返回城市名 | |
| status | 返回结果状态信息 | ||
| date | 当前时间 | 年-月-日 | |
| results | 天气预报信息 | 白天可返回近期3天的天气情况（今天、明天、后天）、晚上可返回近期4天的天气情况（今天、明天、后天、大后天） | |
| results.currentCity | 当前城市 | ||
| results.weather_data | weather_data.date | 天气预报时间 | |
| weather_data.dayPictureUrl | 白天的天气预报图片url | ||
| weather_data.nightPictureUrl | 晚上的天气预报图片url | ||
| weather_data.weather | 天气状况 | 所有天气情况（”|”分隔符）：晴|多云|阴|阵雨|雷阵雨|雷阵雨伴有冰雹|雨夹雪|小雨|中雨|大雨|暴雨|大暴雨|特大暴雨|阵雪|小雪|中雪|大雪|暴雪|雾|冻雨|沙尘暴|小雨转中雨|中雨转大雨|大雨转暴雨|暴雨转大暴雨|大暴雨转特大暴雨|小雪转中雪|中雪转大雪|大雪转暴雪|浮尘|扬沙|强沙尘暴|霾 | |
| weather_data.wind | 风力 | ||
| weather_data.temperature | 温度 |
返回xml格式的数据
<CityWeatherResponse>
<status>success</status>
<date>2013-07-18</date>
<results>
<currentCity>北京市</currentCity>
<weather_data>
<date>周三</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>微风</wind>
<temperature>23℃</temperature>
<date>周四</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/leizhenyu.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/zhongyu.png
</nightPictureUrl>
<weather>雷阵雨转中雨</weather>
<wind>微风</wind>
<temperature>29～22℃</temperature>
<date>周五</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/yin.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>阴转多云</weather>
<wind>微风</wind>
<temperature>31～23℃</temperature>
<date>周六</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>微风</wind>
<temperature>31～24℃</temperature>
</weather_data>
<currentCity>合肥市</currentCity>
<weather_data>
<date>周三</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>东风3-4级</wind>
<temperature>27℃</temperature>
<date>周四</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>东北风3-4级</wind>
<temperature>35～27℃</temperature>
<date>周五</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>南风</wind>
<temperature>35～27℃</temperature>
<date>周六</date>
<dayPictureUrl>
http://api.map.baidu.com/images/weather/day/duoyun.png
</dayPictureUrl>
<nightPictureUrl>
http://api.map.baidu.com/images/weather/night/duoyun.png
</nightPictureUrl>
<weather>多云</weather>
<wind>东风</wind>
<temperature>34～27℃</temperature>
</weather_data>
</results>
</CityWeatherResponse>
<weather>阵雨</weather>
<wind>东北风3-4级</wind>
<temperature>18℃</temperature>
</result>
</results>
</CityWeatherResponse>
返回json格式的数据
{
error: 0,
status: "success",
date: "2013-07-17",
results: [
{
currentCity: "北京市",
weather_data: [
{
date: "今天（周三）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "微风",
temperature: "23℃"
},
{
date: "明天（周四）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/leizhenyu.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/zhongyu.png",
weather: "雷阵雨转中雨",
wind: "微风",
temperature: "29～22℃"
},
{
date: "后天（周五）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/yin.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "阴转多云",
wind: "微风",
temperature: "31～23℃"
},
{
date: "大后天（周六）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "微风",
temperature: "31～24℃"
}
]
},
{
currentCity: "合肥市",
weather_data: [
{
date: "今天（周三）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "东风3-4级",
temperature: "27℃"
},
{
date: "明天（周四）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "东北风3-4级",
temperature: "35～27℃"
},
{
date: "后天（周五）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "南风",
temperature: "35～27℃"
},
{
date: "大后天（周六）",
dayPictureUrl: "http://api.map.baidu.com/images/weather/day/duoyun.png",
nightPictureUrl: "http://api.map.baidu.com/images/weather/night/duoyun.png",
weather: "多云",
wind: "东风",
temperature: "34～27℃"
}
]
}
]
}