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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.
The highest monthly average temperature in Dallas for August is 86 degrees. The lowest monthly average temperature in Dallas for December is 48 degrees. The most monthly precipitation in Dallas occurs in March with 5.7 inches. The air quality index in Dallas is 8% worse than the national average. The pollution index in Dallas is 27% better than the national average.