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The effect of the weather temperature on the energy spectrum by the scintillation detector NaI(Tl) has been studied in this work. A radioactive cesium standard source Cs-137 with an energy 0.662 MeV was used and a heat source was used to control the temperature. Used also thermometers on right and left side from the detector to measure the appropriate temperature .A cup-shaped container containing all these parts was used to maintain the temperature constant to obtain on the best results .It was found that the peak position (centroid) decreases of spectrum and photo peak area when the temperature increased .The value of Net and Gross degreases with increasing temperature in the total area, and there is no understand behavior of Net and Gross the photo peak area. Also there is no clear behavior of the FWHM and energy of resolution for the photo peak.