This study investigated the temperature characteristics of mold type and rebar diameter depending on the existence of shading under the sunlight in a hot weather condition in Korea. The molds were made out of euroform wood, gang form iron, al form aluminum, and rebars were four kinds of D13, D19, D25, and D32. They were measured using thermocouple thermometers in real outdoors condition, from August 3, 2012, until August 5, 2012, for three days. Results showed that gang form mold was the hottest at $62.2^{circ}C$, followed by aluminum and wooden molds. Their temperatures reached peak ar around 14:00. As for the rebars, in the aluminum molds highly susceptible to heat reflecion, D32 peaked at $62.5^{circ}C$, and this peak temperature was followed by when in gang form and wooden molds. Because rebars with thicker diameter store more heat, their temperatures peaked later when the atmosphere temperature peaked. As for the shading materials that prevent temperature from rising due to sunlight, SBS, which is modified conventional bubble sheet surface into aluminum deposition layer, was the most capable of keeping the temperature lower than that of the atmosphere. This was followed by tent made of blue sheet, WBS using which pigment, and curtain in black in terms of effectiveness.