Having a problem with this program where it won't print out the what day the lowest temperature was on, I get arrayindexoutofbounds error, can't for the life of me figure out why, the error occurs on line 122.
Here an image of the error message, any help appreciated.
Please post the text of the error messages, not a screenshot, which is very difficult to read. That link should tell you how to copy'n'paste the error message.
That isn't an Error, but an Exception. You get out of bounds exceptions if you try to use non‑existent indices. If you have a ten‑element array and try to use myArray or myArray[-1] (), you will have such an Exception thrown. The same applies to Lists. If you have a List with seven elements, then accessing myList.get(7) won't work. Indices for days of the week run 0...6 inclusive, not 0...7 inclusive. If you count the tokens in line 116, you will see you have eight array access expressions.
The same indices apply to Lists and arrays.
You might do better to use a loop to iterate your array: much more concise than writing out the elements individually. And, if you get the loop right, much more error‑resistant.
Don't write new XYZ or similar. Declare a local constant DAYS_IN_WEEK and use that throughout. That will ensure that all your arrays are the same size. Mixing arrays length 7 and arrays length 8 is a sure‑fire recipe for mismatches.