Answer:
no
Explanation:
The answer would be no, because there are many different scenarios when it is not raining, but the sun is not shining.
Lets say it is night time and it is not raining. Even though it is not raining, the sun is not shining.
Lets say it is cloudy, but it is not raining. Even though it is not raining, the sun it not shining.
"If it is not raining, then the sun must be shining" is the converse of "If the sun it shining, then it is not true". Even though a statement is true, the converse of that statement may not be true.