According to Florida Today's Flame Trench:
"Strong winds Tuesday could pose a challenge for the planned launch of a Falcon 9 rocket on a NASA demonstration flight. A surge of wind blowing in with a cold front presents a 60 percent chance of weather violating launch criteria, according to Air Force meteorologists, with sustained winds around 20 knots and gusting to 25 knots. Conditions at Cape Canaveral Air Force Station should improve Wednesday and Thursday, with a 90 percent chance of favorable weather. The launch window is the same each day."
The official forecast can be found here.