Why Your Allergies Can Get Worse After a Summer Storm

(August 2026) Written by Dr. Gina Dapul-Hidalgo, MD

Summer storms can bring more than heavy rain, strong winds, and cooler temperatures. For people with allergies, a storm can sometimes trigger a sudden increase in sneezing, congestion, coughing, and other symptoms.

I’m Dr. Gina Dapul, board-certified allergist and founder of Family Center for Allergy and Asthma. In this post, I want to explain why allergy symptoms can become worse after a summer storm and what you can do to protect yourself.

If you notice that your symptoms seem to flare after a storm, there may be a reason.

Why Summer Storms Can Trigger Allergy Symptoms

During the summer, outdoor allergens such as pollen and mold spores can be present in the air. When a storm moves through, changes in wind, humidity, and rainfall can affect how these allergens are distributed.

Rain may temporarily reduce some pollen in the air, but storms can also stir up allergens and contribute to conditions that allow mold to grow.

For some people, this can lead to increased allergy symptoms after the storm passes.

What Happens to Pollen During a Storm?

Pollen levels can change quickly during stormy weather.

Strong winds may move pollen through the air and spread it to new areas. In addition, moisture can cause some pollen particles to break apart into smaller particles that may travel deeper into the airways.

This can be especially problematic for people who are sensitive to grass or other seasonal pollens.

Mold Can Also Become a Problem

Summer storms bring moisture, and moisture creates an environment where mold can thrive.

After heavy rain, mold spores can increase outdoors and may also become a problem indoors if there is water intrusion, flooding, or prolonged dampness.

You may notice symptoms such as:

• Sneezing and a runny nose

• Nasal congestion

• Itchy or watery eyes

• Coughing

• Throat irritation

• Increased sinus pressure
  

If your symptoms consistently worsen after rainy or stormy weather, mold or other environmental allergens may be contributing.

Why Symptoms May Continue After the Storm

One common misconception is that allergy symptoms should disappear as soon as the rain stops.

Unfortunately, that is not always the case.

Pollen, mold spores, and other allergens can remain in the environment after a storm. Increased humidity can also contribute to ongoing nasal and respiratory irritation.

This means you may continue experiencing symptoms for hours or even days after the weather clears.

What Can You Do to Reduce Your Exposure?

You cannot control the weather, but you can reduce your exposure to allergens.

Consider these strategies after a summer storm:

• Keep windows closed when outdoor allergen levels are high

• Shower and change clothes after spending time outdoors

• Keep indoor spaces dry and address water leaks promptly

• Use air conditioning rather than opening windows when possible

• Monitor your symptoms and notice whether they follow a seasonal or weather-related pattern
  

If you regularly experience symptoms after storms, it may also be helpful to discuss allergy testing with an allergist.

When Should You See an Allergist?

Occasional sneezing after being outdoors may not be a major concern. However, persistent or worsening symptoms deserve attention.

Consider seeing an allergist if your symptoms:

• Happen frequently during the summer

• Become worse after storms or periods of heavy rain

• Interfere with sleep or daily activities

• Require frequent use of allergy medications

• Include persistent coughing, wheezing, or breathing difficulties

• Are difficult to control despite treatment
  

Identifying your specific triggers can help us create a treatment plan that is tailored to your needs.

Final Thoughts

Summer storms can create the perfect combination of wind, moisture, pollen, and mold that may make allergy symptoms worse.

If you notice a pattern between storms and your symptoms, do not simply assume you have to live with it. Understanding your triggers can help you take steps to reduce exposure and find more effective treatment.

Ready to take the next step?

Schedule an appointment with a board-certified allergist to identify your triggers and develop a personalized plan for managing your allergies.

To your health and well being, Dr. Gina Dapul-Hidalgo