为以下三个城市提供天气预报：纽约市，伦敦，东京。
New York City: Partly cloudy with a high of 25°C and a low of 20°C.
London: Mostly cloudy with a chance of rain and a high of 18°C and a low of 12°C.
Tokyo: Sunny with a high of 31°C and a low of 25°C.