Heat exposure poses a significant threat to occupational safety, emphasizing the necessity of timely risk assessments to safeguard the workforce. Despite the critical role of heat risk assessment in occupational safety, its practical implementation is hindered by challenges in timely data collection, which impedes the deployment of proactive heat mitigation strategies. To bridge this information gap, this paper explores a methodological advancement designed to integrate public weather forecasts and on-site observations, enhancing the prediction and understanding of imminent occupational heat risks. We conducted a case study in College Station, Texas, as proof of concept. The case study confirms the performance improvements and identifies areas for further enhancement. This methodological advancement in heat risk assessment is to be of benefit to practitioners facilitating risk-informed decision-making for mitigating potential heat-related accidents in job sites.