The past couple of days have been rainy and dreary here in Charleston, SC. Rain can dampen your mood or make you want to curl up with a book, but how does rain affect your allergies?

Rain Can Help

Rain can help with lowering pollen levels. When the weather out is dry, trees will release more pollen than when there is moisture in the air. The moisture in the air is what weighs down pollen as it travels in the wind. The less moisture in the air, the easier it is for pollen to travel farther. Rain stops pollen from being able to move around easily in the air because of the humidity that follow a rainstorm. Rain will also wash away pollen.


If you only suffer from pollen allergies, the rain is great! However, if you struggle with grass, dust, mold, or weeds allergies, the rain can cause more harm than good.

Mold thrives in damp conditions. If you struggle with mold allergy than it is important to remain vigilant about mold forming indoors and outside. Dust mites also thrive in humid conditions. It is important to maintain a clean house. Having a humidifier can help maintain a low humidity indoors to prevent mold and dust mite growth.

While the rain washes away tree pollen, it can also disrupt grass and weed pollen in a way that causes more harm than good. In heavy rainstorms, water droplets can break up clumps of grass and weed pollen into smaller particles. The pollen is then dispersed quickly. This can cause an increase in allergic asthma symptoms during the rainstorm. This is known as thunderstorm asthma.

Can I Prepare?

Understanding the implications of the rain and how it will affect your allergies is important for preparation. If you have pollen allergies, knowing some relief will come with the rain is great! But, if you have mold, grass, weeds, or dust mite allergies, knowing how the rain will affect you can help you maintain a healthy a symptom free life. If you need help maintaining your allergies, a Board-Certified allergist at National Allergy & ENT can assist you. To schedule an appointment please call (843) 797-8162, or schedule online.

Source: Asthma and Allergy Foundation of America