You can know how the weather will be like tomorrow by visiting sites such as BBC weather United Kingdom or trip advisor. These sites usually provide a weekly weather forecast for various cities and towns in the world.
3 Additional Answers
The weather keep fluctuating each and everyday, to know how the weather is going to be tomorrow check your local news or check onlinewww.metoffice.gov.uk/weather/up/uk_forecast_weather.html
To know what the weather is going to be like tomorrow or any other day you can go to the BBC site which has the weather forecasts for the whole week and month. There are also online sites such as weather where they have the forecast and temperatures for UK for every day.
Monitor their current weather conditions and receive severe weather alerts using the weather channel toolbar after downloading it or just Google weather information online.