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.
Washington, United States of America weather text for Sun 03rd September. It looks on Sunday, 03 September the Washington, United States of America weather is going to be sunny. The visibility is going to be around 16 km i.e. 10 miles and an atmospheric pressure of 1018 mb.