OSHA Heat App and Heat Logs: A Practical Jobsite Workflow

What does the OSHA heat app do?

The OSHA–NIOSH Heat Safety Tool provides location-based heat-index information for planning outdoor work. CDC's page, updated March 3, 2026, says the app is not receiving updates at this time. Verify that notice before relying on availability or functionality; it does not say the app has been permanently discontinued.

Weather information and a jobsite log answer different questions. A weather reading describes conditions. A log records the supervisor's observations and actions. Neither a favorable reading nor a completed record is permission to continue unsafe work. HeatProof Log is independent and is not an OSHA or NIOSH product.

Do not treat a weather number as a complete assessment

Heat index has limitations: it does not represent every combination of radiant heat, workload and protective clothing. OSHA recommends onsite WBGT measurement when assessing environmental heat. An outdoor forecast cannot describe every enclosed room, sun-exposed roof or work area.

Our editorial recommendation is to identify the source beside every recorded value. Label a forecast as a forecast and an onsite observation as an onsite observation. If two readings disagree, preserve the context instead of averaging different measurement types into a seemingly precise result.

Turn the check into a documented decision

Before the shift, assign a person to review conditions and the site's prevention program. Record the work area, planned task, information source and time checked. Keep a separate place for the action: the supervisor responsible, measures arranged and next review.

During the shift, add a new entry when the crew changes location or the plan changes. For example, moving from exterior prep work into an enclosed room deserves a new description; copying the previous weather number alone loses that context. At handoff, leave a plain-language note explaining outstanding actions and who owns them.

Test the record with a simple question: could another supervisor understand what actually happened without calling the person who filled it out? Replace vague entries such as ‘all good’ with specific observations. Never backfill an action as completed merely because it was planned.

FAQ: Is the OSHA app available in Spanish?

CDC describes Spanish support through device language settings and selected informational pages. Because its page also carries the update notice, check the current official instructions and the behavior on your device.

FAQ: Does using an app prove compliance?

No. Review the applicable requirements and implement a site-specific prevention program. Software can support a workflow; it cannot establish that a jobsite was safe or that every legal duty was fulfilled.