No
It is a popular view that running in the rain can increase your chance of falling ill. Exposure to the cold rain and damp air, with the physical exertion, is thought to weaken the body's defences, making us vulnerable to cold and flu viruses.
As children, many of us were admonished for playing in rainstorms and were quickly dried off before the water droplets made us ill.
But there is no reasonable explanation for this belief. According to Dr Linda Hui, chief physician at Matilda Medical Centre, there is no scientific evidence to back up the correlation between running in the rain and illness. Colds and flu are spread by viruses.
These viruses are often present in the respiratory secretions of infected individuals, and are typically transmitted through sneezing, coughing, talking, and through contact with surfaces that have been contaminated. So any cold and flu symptoms that are experienced after a run in the rain are related to a viral infection.