.TODAY...Mostly cloudy. Highs 36 to 42. .TONIGHT...Partly cloudy. Lows 14 to 20. Southwest winds 10 to 15 mph. .SUNDAY...Partly cloudy. Highs near 40. West winds 10 to 15 mph. .SUNDAY NIGHT...Mostly clear. Lows around 18. Southwest winds 10 to 15 mph. .WASHINGTONS BIRTHDAY...Partly cloudy. Highs in the mid 40s. West winds 10 to 15 mph. .MONDAY NIGHT AND TUESDAY...Mostly cloudy. Lows in the mid 20s. Highs in the mid 40s to lower 50s. .TUESDAY NIGHT...Mostly cloudy with a 30 percent chance of rain and snow. Lows 14 to 18. .WEDNESDAY...Snow likely. Colder. Highs 23 to 31. Chance of snow 70 percent. .WEDNESDAY NIGHT...Snow likely. Colder. Lows around 5 below. Chance of snow 60 percent. .THURSDAY...Partly cloudy. Highs 18 to 24. .THURSDAY NIGHT...Mostly cloudy with a 20 percent chance of snow. Lows 4 to 8. .FRIDAY...Mostly cloudy. Not as cold. Highs 31 to 37.