Yes — temperature can affect how CGM sensors perform.
Extreme heat or cold may temporarily influence glucose readings, adhesive strength, and overall sensor reliability.
These effects are usually short-term and resolve once you return to a normal temperature range.
1. How heat can affect your CGM sensor
High temperatures (such as hot weather, saunas, hot tubs, or intense workouts) may:
Cause glucose readings to appear temporarily higher due to increased blood flow to the skin
Weaken the adhesive, making the sensor more likely to loosen
Affect sensor performance if exposed to prolonged or extreme heat
Tips to reduce heat-related issues
Avoid prolonged exposure to direct sunlight or very hot environments
Skip saunas, hot tubs, and steam rooms while wearing a sensor
Store unused sensors at room temperature according to manufacturer guidelines
2. How cold can affect your CGM sensor
Cold temperatures (such as winter weather or cold-water exposure) may:
Cause glucose readings to appear temporarily lower due to reduced blood flow near the skin
Slow sensor response time
Reduce adhesive stickiness, increasing the chance of detachment
Tips to reduce cold-related issues
Keep the sensor area warm with clothing or layers
Avoid direct contact with ice or very cold water
If readings seem unusually low after cold exposure, move to a warmer environment and wait 15–30 minutes before rechecking trends
3. What to do if temperature affects your readings
If you notice unexpected changes after heat or cold exposure:
Give it time — allow your body and sensor to return to a normal temperature
Look at trends, not a single reading
Use context (environment, activity, recent exposure) when interpreting data
Most temperature-related effects are temporary and resolve on their own.
Important note on extreme cold therapies
❌ Cryotherapy and ice baths are not recommended while wearing a CGM sensor.
Extreme cold exposure can interfere with sensor performance and may damage the sensor or adhesive.
Key takeaway
Temperature extremes can temporarily affect CGM readings and adhesion, but these effects are usually short-lived. By avoiding extreme heat or cold and focusing on glucose trends rather than single readings, you’ll get the most reliable insights from your CGM