I've been doing some exercise for weight loss and was wondering when is the best time to do those exercises?

No specific time: as long as you do them on a regular basis at least 5 days a week. You also need to eat a good balanced diet and moderate portions.

Best for your body: While our internal clock (circadian) plays an important role in our health, their is no clear evidence that exercising at any specific time of the day matters. Get good sleep at night and exercise when best for you. ACC Guide http://www.heart.org/HEARTORG/GettingHealthy/PhysicalActivity/FitnessBasics/American-Heart-Association-Recommendations-for-Physical-Activity-in-Adults_UCM_307976_Article.j