September weather forecast
Idaho, USA

September in Idaho marks the graceful dance between the waning days of summer and the onset of fall. It's a month of transition, characterized by milder temperatures, changing foliage, and a shift in the general atmosphere from the lively buzz of summer to the more contemplative aura of autumn.

The state's mountainous terrains, including the majestic White Cloud Mountains, begin to showcase a brilliant spectrum of colors. Golds, reds, and oranges intermingle with the greens, creating a mesmerizing tapestry that beckons photographers, artists, and nature enthusiasts.

In urban hubs like Boise, temperatures generally hover from the mid 60s°F to mid 70s°F. The warmth of August gives way to more temperate days, and the nights, in particular, start to feel decidedly crisp. This coolness, especially noticeable in the mornings and evenings, heralds the upcoming winter.

Rain becomes slightly more frequent in September, especially in the western regions influenced by the Pacific. These showers, while not as sparse as in August, are usually moderate and interspersed with sunny intervals, casting a unique light over the landscape.

Rivers, now serene after the summer's activities, mirror the clear blue skies and the changing colors of the banks. Lakes, though cooler than in August, are still welcoming to those seeking a refreshing dip or a quiet boat ride.

When compared to October, September serves as a gentle introduction to fall. It retains the warmth of summer but with an undeniable touch of autumn's cool elegance. By month's end, as the foliage reaches its peak and days become shorter, the impending embrace of winter becomes more palpable.

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• Boise - September »
  On the first day of September in Boise, sunrise is at 7:08 am and sunset at 8:20 pm. In September, in Boise, the rain falls for 6.7 days.
• Meridian - September »
  On the first day of September in Meridian, sunrise is at 7:09 am and sunset at 8:21 pm. In September, in Meridian the rain falls for 5.9 days.
• Nampa - September »
  On the first day of September in Nampa sunrise is at 7:10 am and sunset at 8:22 pm. In Nampa, in September, during 4.9 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.
• Idaho Falls - September »
  On the last day of September, in Idaho Falls, sunrise is at 7:24 am and sunset at 7:11 pm MDT. In Idaho Falls, during September, the rain falls for 8.1 days and regularly aggregates up to 0.83" (21mm) of precipitation.
• Pocatello - September »
  In Pocatello in September, during 7.5 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. In September, in Pocatello the rain falls for 7.5 days.
• Caldwell - September »
  On the first day of September in Caldwell, sunrise is at 7:10 am and sunset at 8:22 pm. On the first day of September in Caldwell, sunrise is at 7:10 am and sunset at 8:22 pm.
• Coeur d'Alene - September »
  In Coeur d'Alene in September, during 8.3 rainfall days, 0.91" (23mm) of precipitation is typically accumulated. In Coeur d'Alene in September, during 8.3 rainfall days, 0.91" (23mm) of precipitation is typically accumulated.
• Twin Falls - September »
  On the last day of September, in Twin Falls sunrise is at 7:33 am and sunset at 7:21 pm MDT. In Twin Falls in September, it is raining for 6.4 days, with typically 0.35" (9mm) of accumulated precipitation.
• Lewiston - September »
  On the first day of September in Lewiston, sunrise is at 6:08 am and sunset at 7:27 pm. The onset of September in Lewiston is marked by a decrease in temperature, transitioning from 85.3°F (29.6°C) in August to a still moderately hot 75°F (23.9°C).
• Post Falls - September »
  In Post Falls, Idaho, in September, during 8.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Post Falls, in September, during 8.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.
• Rexburg - September »
  In Rexburg, Idaho, during September, the rain falls for 9 days and regularly aggregates up to 0.91" (23mm) of precipitation. On the first day of September in Rexburg, Idaho, sunrise is at 6:50 am and sunset at 8:03 pm.
• Moscow - September »
  In Moscow, Idaho, during September, the rain falls for 8.1 days and regularly aggregates up to 0.63" (16mm) of precipitation. On the last day of September, in Moscow, Idaho, sunrise is at 6:45 am and sunset at 6:30 pm PDT.