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The Bahrain Grand Prix in Malaysia presents two weather challenges: intense heat and the possibility of tropical rain.<\/strong> The FIA has formally declared a heat hazard for the Sepang weekend, while the forecast reported by GRANDE PR\u00caMIO<\/strong> indicates a chance of rain during every session.<\/p>\n\n\n\n The distinction matters as Formula 1<\/a> returns to the circuit for the first time since 2017. Heat affects drivers, cooling requirements and tyre performance even when the track stays dry; rain could introduce a different set of demands during practice, qualifying and Sunday\u2019s race.<\/p>\n\n\n\n Friday\u2019s opening practice took place without rain<\/strong>, with Max Verstappen setting the fastest time. Drivers nevertheless encountered the demanding conditions anticipated before the weekend.<\/p>\n\n\n\n Race director Rui Marques issued the declaration on Wednesday, 30 September<\/strong>, after receiving a forecast from the championship\u2019s official weather service.<\/p>\n\n\n\n The document specifies that the heat index is expected to exceed 31\u00b0C at some point during the race<\/strong>. That measure accounts for the combined effect of temperature and humidity; it is not simply the air temperature shown on a thermometer.<\/p>\n\n\n\n \u201cA Heat Hazard is declared,\u201d the FIA notice states.<\/p>\n\n\n\n The declaration activates the championship\u2019s driver-cooling provisions. Cars must carry the required cooling system<\/strong>, while drivers can elect not to wear the personal equipment that forms part of it. In that case, the regulations require compensating cockpit ballast. <\/p>\n\n\n\n A cooling vest circulates cooled fluid through tubing to help manage the driver\u2019s body temperature. The requirement to fit the system and the driver\u2019s decision to wear its personal equipment are separate parts of the procedure.<\/p>\n\n\n\n The forecast cited by GRANDE PR\u00caMIO<\/strong>, attributed to the European Centre for Medium-Range Weather Forecasts, places FP2 at the highest rain probability, with 70%<\/strong>.<\/p>\n\n\n\n Qualifying follows at 60%<\/strong>, while Sunday\u2019s race is listed at 50%<\/strong>. The same forecast gives FP3 a lower probability of 20%.<\/p>\n\n\n\n These figures describe the forecast available for the report. They are not guarantees of rainfall, and they should not be read as the percentage of a session that will be wet.<\/strong> Forecasts from different providers can also vary, particularly for localised showers.<\/p>\n\n\n\n Forecast figures reproduced from the report supplied for this article; probabilities may change with subsequent updates.<\/p>\n\n\n\n The absence of rain in FP1 did not make the opening hour straightforward. Verstappen led Russell by 0.383 seconds<\/strong>, but heat, grip and tyre degradation remained prominent concerns.<\/p>\n\n\n\n \u201cThe tyre degradation is insane,\u201d Charles Leclerc said over the radio.<\/p>\n\n\n\n \u201cThis is the craziest I\u2019ve ever been in my life with temperatures,\u201d Gabriel Bortoleto reported. <\/a><\/p>\n\n\n\n Those observations underline why the heat declaration remains relevant alongside the rain forecast. Teams need to manage cooling and tyre performance while remaining ready to respond if conditions change.<\/p>\n\n\n\nWhy has the FIA declared a heat hazard?<\/h2>\n\n\n\n
How likely is rain at Sepang?<\/h2>\n\n\n\n
Bahrain GP in Malaysia: reported rain probabilities<\/h3>\n\n\n\n
Session<\/th> Date<\/th> Reported chance of rain<\/th><\/tr><\/thead> FP1 \u2014 completed in dry conditions<\/td> Friday, 2 October<\/td> 30% before the session<\/td><\/tr> FP2<\/strong><\/td> Friday, 2 October<\/strong><\/td> 70%<\/strong><\/td><\/tr> FP3<\/td> Saturday, 3 October<\/td> 20%<\/td><\/tr> Qualifying<\/strong><\/td> Saturday, 3 October<\/strong><\/td> 60%<\/strong><\/td><\/tr> Race<\/td> Sunday, 4 October<\/td> 50%<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n Dry FP1 already exposed the heat challenge<\/h2>\n\n\n\n