Remove the semicolon at the end of this line:
if (temp > 95 || temp < 20);
And please, please use curly brackets! Java is not like Python, where indenting the code creates a new block scope. Better to play it safe and always use curly brackets - at least until you get some more experience with the language and understand exactly when you can omit them.
The issue is that the first if if (temp > 95 || temp < 20); is the same using normal indentation as
if (temp > 95 || temp < 20)
{
}
That is if the temp is not between 20 and 95 then execute an empty block. There is no else for this.
The next line else then has no if corresponding to it and thus produces your error
The best way to deal with this is always uses braces to show what is executed after the if. This does not mean the compiler catches the errors but first you are more likely to see any issues by seeing the indentation and also the errors might appear more readable. However you can use tools like eclipse, checkstyle or FindBugs that will tell you if you have not used {} or used an empty block.
A better way might be, sorting out the logic as you are retesting things
if (temp > 95 || temp < 20)
{
System.out.println ("Visit our shops");
} else if (temp >= 80)
{
System.out.println (“Swimming”);
} else if (temp >=60)
{
System.out.println (“Tennis”);
} else if (temp >= 40)
{
System.out.println (“Golf”);
} else if (temp >= 20)
{
System.out.println (“Skiing”);
}