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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.
Key weather averages for Texas in March. 1  22. 22Â°C max day temperature. 2  7. 7 hours of sunshine per day. 3  7. 7 days with some rainfall. 4  10. 10Â°C min night temperature. 5  12. 12 hours of daylight per day. 6  0. No heat & humidity. 7  47. 47 mm of monthly rainfall. 8  8. 8 (Very High) UV index.