Urban form is the physical characteristic of the built-up area, where the urban areas are performing as climate modifiers. A hot and humid city like Muscat, Sultanate of Oman, is an example of a fast urbanized city. It is facing the challenge of livable and walkable urban development, especially in the newly planned residential areas. Cars are dominating newly planned residential areas, severely compromising pedestrian mobility from the side of safety, connectivity, and comfort. On the other hand, peoples' outdoor activities and the usage of the urban areas, especially streets, which are the most viable feature of the urban design, are directly affected by the microclimate and thus impact walkability. This research investigates the influence of urban form on streets' walkability conditions. It focuses on studying the streets fabrics of two different residential development in Muscat. The study started with a theoretical review to understand the relation between the urban form, microclimate aspects, and walkability conditions and identify their matrices. The literature concluded by preparing an evaluation list that helps compare and evaluate research's main factors. The study then proceeds to a comparative analysis of the urban form and the walkability conditions between the most common form of the new urban planning in Muscat (Al Khoudh6) and the carefully designed gated residential settlement (AL Mouj). In addition, at both locations, a climatic measurement occurred during the transition season, where a comparative analysis of the resulting data is also covered. The collected data are then evaluated, by using the introduced evaluation list, to find the relation between urban form, microclimate aspects, and walkability conditions. The results interpret that microclimate and walkability conditions are better in the carefully designed settlement (Al Mouj), due to the proper urban form planning, that implements the critical urban form indicators positively. In addition, results prove that both microclimate and walkability conditions are significantly influencing pedestrian comfort. The study concluded that the carefully designed urban form resulted in a comfortable outdoor walkable area and positively influenced environmental conditions. Finally, the study recommended some points to be considered during urban planning and some solutions that can improve walkability conditions in the existing areas.