When a heatwave hits London, many people expect sunburn, dehydration or hay fever symptoms. But for those with sensitive sinuses, hot weather can also bring congestion, pressure, and even sinus infections. Understanding why this happens and how to manage it can make a big difference to your summer comfort.

Why do your sinuses struggle in hot weather?

Your sinuses are air-filled cavities that rely on a steady flow of moisture and good drainage to stay healthy. When the temperature rises, several factors can disturb this balance:

  • Dry air from air conditioning can dry out the mucosal lining, leading to thick mucus and blocked sinuses.

  • Dehydration makes your mucus thicker, which slows drainage and creates an environment for bacteria to grow.

  • Sudden changes in humidity, such as moving between outdoor heat and cool indoor spaces, can irritate the nasal passages.

  • Increased pollen and pollution levels during summer can trigger allergic reactions that inflame the sinuses.

What are the symptoms of heat-related sinus problems?

Many people in London experience the following symptoms in hot weather:

  • Facial pressure or pain

  • Headaches focused around the eyes or cheeks

  • Blocked nose or thick mucus

  • Post-nasal drip

  • Fatigue or difficulty concentrating

If these symptoms persist for more than 10 days, or if you develop a fever, it could be a sign of a sinus infection requiring medical attention.

What can you do to relieve symptoms?

Thankfully, there are several practical ways to stay on top of your sinus health during summer:

  • Stay hydrated: Aim to drink at least 1.5–2 litres of water per day.

  • Use a saline nasal spray: This helps keep your nasal passages moist and encourages healthy drainage.

  • Avoid allergens: Monitor pollen levels and keep windows closed during peak times.

  • Limit air conditioning: Use a humidifier or open a window occasionally to balance dry indoor air.

  • Use a cold compress: If you feel pressure building, a cool compress across the sinuses can provide relief.

  • Rinse with saline: A neti pot or saline rinse can help clear out irritants and thin mucus.

When to see a sinus specialist in London

If your sinus problems are persistent, severe, or recurring in hot weather, it may be time to speak to an ENT specialist. At London ENT, we offer expert assessment, imaging such as CT scans, and advanced treatment for chronic or seasonal sinus issues. Our clinics across London and Essex are well-equipped to provide long-term relief and peace of mind.

FAQs about sinus health and heat

Can hot weather actually trigger a sinus infection?
Yes. Dehydration, dry air, and increased allergens can create ideal conditions for bacteria to grow.

Will drinking water really help my sinuses?
Yes. Keeping mucus thin is essential for healthy drainage and avoiding congestion.

Do antihistamines help with summer sinus issues?
They can help reduce allergic inflammation, but always consult a specialist before starting long-term use.

Need sinus help this summer?

Contact London ENT today on 0203 865 7225 to speak to a sinus specialist in London. Whether you’re managing chronic congestion or seasonal flare-ups, we can help you breathe easier through the heat.