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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.
From May to September, Dallas has daily temperatures of at least 70 Â°F. Typically 17 of those days have 100-plus degree weather. Even winter days often reach 70 degrees. For only six times a year on average does the highest temperature of the day in Dallas stay below 40. 1  Days per month in Dallas of at least 70, 80 or 90 Â°F. 2  Average number of days monthly in Dallas that stay above 50, 60 or 70 Â°F.