When the temperature rises, it’s not just your comfort that’s at risk—your diabetes tech can feel the heat too! CGMs (Continuous Glucose Monitors) are powerful tools for staying on top of your glucose levels, but they can be sensitive to extreme weather conditions, especially high heat.
Whether you're out enjoying the sunshine or just trying to get through a sweltering commute, here’s how to keep your CGM safe, accurate, and securely attached when the mercury climbs.
☀️ 1. Keep it cool (but not cold!)
Avoid direct sun exposure to your CGM and transmitter. Extended exposure to heat—especially over 37°C (98.6°F)—can degrade the adhesive, affect sensor accuracy, and even damage the transmitter’s battery.
Tips:
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Cover your CGM with loose, breathable clothing.
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Use a patch cover or armband.
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Avoid hot car interiors—don’t leave any new boxed CGMs or your receiver in a parked vehicle.
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If you're lounging outside, keep your receiver or phone in a shaded pouch or a small insulated bag with a cooling gel pack (not directly on the device).
💧 2. Sweat happens: Prepare for stickiness
Heat = sweat, and sweat can weaken CGM adhesive. If you're active or perspiring a lot, it's worth reinforcing the sensor early.
Tips:
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Use barrier wipes like Skin Tac or IV Prep before applying your CGM.
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Again, wear a sweat-proof overlay patch or armband eg. Libreband and Dexband.
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Let your skin cool down before placing a new sensor.
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Use a patch cover or armband.
- If your adhesive gets wet, pat it dry gently - don't rub.
🏖️ 3. Swimming or splashing? Plan ahead
If you’re heading into a pool, lake, or the sea, check your CGM model's waterproof rating and consider options to cover your sensor before a swim or other water activity.
Tips:
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Wait the full recommended “settling” period (often 1–24 hours) after inserting a new sensor before swimming.
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Use a waterproof CGM cover or band.
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Rinse skin with clean water after swimming to remove salt or chlorine.
📱 4. Mind Your Phone & Devices
If you're using a CGM system that syncs with your phone, such as Dexcom or Freestyle Libre with apps, your phone is part of your setup—and phones also overheat.
Tips:
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Keep your phone in the shade or in an insulated pouch with cooling strips.
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Turn off unnecessary background apps to reduce device heat.
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Avoid placing your phone against hot skin under clothing or in armbands when exercising.
💡 5. Listen to your body & your device
Heatwaves can definitely affect blood glucose levels Your body may become more insulin sensitive or dehydrated. Combined with sensor variability in high temps, it’s wise to keep an extra-close eye on trends.
Tips:
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Calibrate if required (depending on your CGM brand/model).
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Stay hydrated to help your body regulate temperature and glucose levels.
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Carry back-up test strips if your CGM seems off or if you’re experiencing symptoms.
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Don’t ignore alerts—high heat can trigger rapid swings.
- Avoid alcohol which can give more swings in glucose levels - and it can be difficult to judge readings if these are changing very frequently.
🧳 Travelling during a heatwave?
If you're travelling:
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Pack backup sensors and wipes in a cool, protected travel case.
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Use a Frio pouch or similar cooling bag to transport insulin and electronics safely.
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Research your destination’s forecast and prepare for extra sweat, sun, or showers.
Summary
Heatwaves don’t have to disrupt your diabetes management. With a few smart steps, you can enjoy the summer safely and comfortably. Think: shade, secure adhesives, hydration, and back-ups.
Stay cool, stay confident—and let your medtech support you, not stress you.
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