Writing a letter to grandpa telling him about the weather here in 5 sentences

Written this to see if it suits you.

It shows that it will be sunny in most part of China tomorrow, and this kind of weather will go on for 3 to 5 days.But in southern area will have light rain ,the temperature will be 15 to 19 centigrade. We hope that people should be able to take umbrella when you go out .

The weather forecast shows that most parts of China will have heavy rain tomorrow. It will be sunny and last for 3 to 5 days. However, there will be occasional light rain in the south and the temperature will be 15 to 19 degrees Celsius. I hope everyone will remember to bring an umbrella when going out tomorrow.