It could be a symptom.
Have you been drinking less water than usual? Also the heat you guys have been having could be adding to dehydration, making it more concentrated, which would leave it looking darker or cloudier.
Symtoms can included irritation, burning, or pain, needing to frequently urinate -only passing small amounts, - but not feeling relieved.
Naturally you could try drinking cranberry juice, sometimes that stops the onset of a UTI for me. However it also might be worth going to the GP and having it tested just to be on the safe side.