The sinusoidal and exponential models for day time and night time temperature pattern have been fitted to weekly mean hourly air temperature data recorded at Hayathnagar Research Farm of CRIDA, Hyderabad during 1995-2007 using an automatic weather station. The lag coefficient ‘a’ of the sinusoidal model ranged between 1.150 – 4.372 and night time temperature coefficient ‘b’ of exponential model ranged between 2.175 – 4.334 during 1st - 52nd standard meteorological weeks. Coefficient of determination (R2 ) values were between 0.892 – 0.995 for the sinusoidal and between 0.931 – 0.988 for the exponential model. Goodness of fit was tested by Student’s ‘t’ statistics as well by the graphical plots of observed vs. estimated mean weekly diurnal temperatures during 2008.