The 2 largest cities in Idaho are Boise with a population of  145,987 and Nampa with 81,557. The next 3 largest cities are  Meridian with 75,092, Idaho Falls with 56,813 and â¦ Pocatello with  54,255.
Averages for Washington DC in September. The weather in September in Washington DC is very attractive for those that want to avoid the peak heat of summer, yet still enjoy lots of warm days on their visit. On average, peak temperatures during the day in September still reach up to 27Â°C.
About 8 days this month will see some precipitation but normally heavy rainfalls of 0.5 inches (about 13 mm) or more occur only on about 2 days. Snow is rare, however, a dusting can be expected about once every 5 years with an inch or more snowfall once every 10 years. What to wear outside in DC during November. Bring clothes that suit both mild to cold weather and it is best to dress in layers. A couple of sweaters and at least one light or medium-weight jacket or coat is a good idea, especially during the second half of this month.