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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.
Dallas averages 33 days where the weather is freezing at some point, with the most occurring in January (12 days) and December (9 days). Dallas homeowners should keep trees trimmed back from their home and around power lines to minimize damage from falling branches during strong winds and winter ice storms.