Body Temperature

Body Temperature stores an absolute temperature measurement. The meaning depends on the measurement site and method: an oral, ear, underarm or other reading is not interchangeable. A compatible thermometer, third-party app or manual entry can supply records.

Apple Watch sleeping wrist temperature is a separate HealthKit type. It measures wrist skin temperature, not ordinary body-temperature readings; it should not be mapped directly onto thermometer fever thresholds.

The selected database snapshot was checked across 365 reporting days, October 2025–September 2026, with a July–September focus window. It contained no raw Body Temperature records. The research therefore cannot estimate observed value ranges, outliers, logging cadence, sleep or workout differences, or correlations for this type. A fabricated zero-valued series or a chart of another temperature type would misrepresent the evidence.

Absence in this window does not establish absence elsewhere, a normal temperature, lack of illness, or lack of a thermometer. Permissions, syncing, source choices and manual logging can all affect the available record.

Keep the measurement site, device and timing consistent where possible. Compare records from the same source and method before combining them. Temperature varies over the day; exercise, environment, medications and illness can influence it. A source revision is provenance, not proof of a stable measurement site.

Use individual readings and repeated comparable measurements rather than summing temperatures. A sample average should not be described as time spent with fever when measurements were intermittent.

The NHS adult fever guide commonly uses 38°C or higher, while emphasizing that symptoms matter. Measurement method, age and clinical circumstances affect assessment. MedlinePlus provides general adult vital-sign context; neither reference defines a universal Apple Health alert rule.

Seek advice appropriate to the symptoms and clinical situation. Severe illness symptoms warrant prompt assessment even without a high reading. Do not use wrist skin temperature or a baseline deviation to confirm or rule out fever.

Basal Body Temperature records a specific resting measurement used in cycle tracking. Sleeping Wrist Temperature records overnight wrist skin temperature. Heart rate and respiratory rate may change alongside illness, but correlations require overlapping, comparable observations and do not establish cause. No such body-temperature relationship could be measured in this snapshot.