Current HHSAA governing document · last source review

Hawaii WBGT rules for high school sports.

Hawaii lets each school use its WBGT chart or heat-index chart. PracticeCast shows the WBGT bands, while the school must use an allowed measurement and its selected chart.

What coaches need to know

HHSAA requires a 14-calendar-day heat-acclimatization period for all student-athletes.
Under 82°F WBGT: normal activity with at least three 3-minute rest breaks each hour.
82.0–86.9°F WBGT: use discretion and provide at least three 4-minute rest breaks each hour.
87.0–89.9°F WBGT: maximum 2-hour practice, football equipment restrictions, and four 4-minute breaks each hour.
90.0–92.0°F WBGT: maximum 1-hour practice, no protective equipment or conditioning, and 20 total minutes of rest.
Above 92.0°F WBGT: no outdoor workouts.

Heat Acclimatization and Practice Policy — WBGT chart

HHSAA's current governing-documents page links this policy. It lets each school use its WBGT chart or its heat-index chart. WBGT is described as best practice; a sling psychrometer may be used for the heat-index alternative.

Condition	What the coach does
WBGT up to 81.9°	Normal activities Provide at least three separate rest breaks each hour, at least 3 minutes each. Keep water continuously available and never restrict access.
WBGT 82°–86.9°	Use discretion for intense or prolonged exercise Watch at-risk athletes carefully. Provide at least three separate rest breaks each hour, at least 4 minutes each. Keep water continuously available and never restrict access.
WBGT 87°–89.9°	Limit practice to 2 hours and modify football equipment Limit practice to 2 hours. For football, restrict equipment to helmet, shoulder pads, and shorts; remove protective equipment for conditioning. Provide at least four separate rest breaks each hour, at least 4 minutes each.
WBGT 90°–92°	Limit practice to 1 hour with no conditioning Limit practice to 1 hour. Do not wear protective equipment or conduct conditioning. Distribute 20 minutes of rest throughout the hour.
WBGT 92.1° and above	No outdoor workouts Cancel outdoor exercise and delay practice until a cooler approved reading occurs.

Source reviewed 2026-07-30. Follow the source’s allowed measurement method.

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Use the current governing document. Local schools, districts, leagues, activities, and medical staff may apply additional or stricter requirements.

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