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Guide to Dallas weather in March. The average maximum daytime temperature in Dallas in March is a comfortable 20Â°C (68Â°F). The average night-time temperature is usually a cool 8Â°C (46Â°F). There are usually 7 hours of bright sunshine each day, which represents 60% of the 12 hours of daylight.
To find out how often it rises over 70, 80 or 90 Â°F each month in Dallas, scroll down farther. There are also counts of nights with warm temperatures and days with cold weather. All the numbers are averages, based on climate data gathered from 1981 to 2010. Average Dallas temperatures.