Greenhouse gas emissions from pollution contributes to global warming by trapping heat in the atmosphere, leading to climate change that disrupts traditional growing seasons, and intensifies extreme weather events by elevating temperature, adversely affecting crop growth, development, and yield. To mitigate these impacts, beneficial microorganisms like Arbuscular Mycorrhiza Fungi (AMF) can be utilized to enhance agricultural resilience and ensure food security amidst a changing climate. This study aims to analyse the impact of high temperatures induced by climate stress on plant morphology, soil properties and phosphatase release, while also assessing the potential of AMF to enhance crop resistance to such stressors. The pot experiment studies conducted in an outdoor environment with a day/night temperature of 42/28°C and a mean temperature of 35°C and in greenhouse at a mean temperature of 23°C. Higher temperature (35°C), extreme weather events and shifting growing seasons were found to have a negative impact on growth characteristics such as shoot height, root length, biomass and flowering of Onion ( Allium cepa) plants. However, the growth parameters improved when plants cultivated at 35°C were inoculated with AMF (+) compared to AMF (−) Onion plants. The findings underscore the importance of integrating microbial symbionts into climate-smart agricultural practices to sustainably produce food amidst in the face of environmental uncertainty.