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1 Â°C. In most years, Denver averages a daily maximum temperature for April that's between 56 and 66 degrees Fahrenheit (13 to 19 degrees Celsius). The minimum temperature usually falls between 31 and 37 Â°F (0 to 3 Â°C).The days at Denver continue warming during April.early every day in April warms to over 40 Â°F (4 Â°C) in Denver. The city averages 8 days this month when the thermometer reaches into the 70s Â°F (over 21 Â°C).
Home : Climate Graphs: Colorado : Denver. Average Temperatures for Denver. Denver's coldest month is January when the average temperature overnight is 15.2Â°F. In July, the warmest month, the average day time temperature rises to 88.0Â°F. Average Rainfall for Denver. The driest month in Denver is February with 0.49 inches of precipitation, and with 2.32 inches May is the wettest month.