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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.
2.1. The highest average temperature in Dallas is August at 86.4 degrees. The coldest average temperature in Dallas is December at 47.7 degrees. The most monthly precipitation in Dallas occurs in March with 5.7 inches. The Dallas weather information is based on the average of the previous 3-7 years of data.