There are more reasons for leg soreness on cloudy days, which may be related to a lot of exercise, rheumatoid arthritis, leg fasciitis and so on. 1. A lot of exercise: leg pain on cloudy days may also be due to a lot of exercise, producing a lot of lactic acid, not timely decomposition of the accumulation of the body, the emergence of the soreness. 2. Rheumatoid arthritis: may be due to streptococcal infection, the formation of antibodies in the body, the role of their own connective tissue, the formation of immune complexes, causing inflammation of the joints of the legs. It can be induced by cold and wet weather. 3. Leg Fasciitis: Due to the long-term overload pressure on the legs, acute or chronic injury to the fascia can be caused, resulting in chronic inflammation of the fascia of the legs of the patient, cold or weather changes will trigger local pain symptoms. When leg pain occurs on a cloudy day, it is recommended to consult a doctor in a timely manner, follow the doctor’s instructions for further examination, clarify the cause with the help of the doctor, and carry out targeted treatment or therapy.