05/07/2026
6 The normal axillary (underarm) temperature range for an NICU baby is 36.5°C to 37.5°C (97.7°F to 99.5°F) . To prevent complications, many NICUs aim for an ideal operating range of 36.7°C to 37.3°C . A temperature below 36.5°C indicates hypothermia, while any reading at or above 38.0°C is considered a fever (hyperthermia).
NICU Temperature RangesMaintaining a “neutral thermal environment” is critical for preterm babies to conserve energy, maintain blood sugar, and support healthy weight gain. The standard The Royal Children’s Hospital Temperature Guidelines classify neonatal temperatures as follows:ClassificationTemperature Range (°C)Temperature Range (°F)Low Temperature (Hypothermia)< 36.5°C< 97.7°FNormothermia (Normal)36.5 - 37.5°C97.7 - 99.5°FLow Grade Fever37.6 - 37.9°C99.6 - 100.2°FFever (Hyperthermia)≥ 38.0°C≥ 100.4°F
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