average annual temperature of Uruguay
Average Temperatures in Montevideo, Uruguay. 1  The average annual temperature in Montevideo, Uruguay is very mild at 15.8 degrees Celsius (60.4 degrees Fahrenheit).2  There is a variation of average monthly temperatures of 12 C (21.6 F) which is a low range. There is a range/ variation of diurnal average temperatures of 10 C (18 F). 2  The warmest month (January) is really warm having an average temperature of 22 degrees celcius (71.6 degrees farenheit).