August weather forecast
Idaho, USA

August in Idaho continues the state's summer narrative, maintaining a warm embrace while hinting at the impending transition to fall. The sun still reigns supreme, casting its golden hue over towns, cities, and the vast wilderness.

Mountain regions, including areas like the Bitterroot Range, still present verdant landscapes, although there's a gradual shift. Some foliage starts hinting at autumnal colors, especially towards the end of the month, setting the stage for the vibrant transformation to come. While the meadows remain lively, the frequency of trekkers slightly diminishes as the month progresses.

Urban areas, such as Boise, usually see temperatures ranging from the mid to high 80s°F. This warmth is very similar to July, but with nights gradually becoming cooler, particularly in the latter half of August. Such a shift signals the upcoming transition to autumn.

Rainfall in August remains sparse, particularly in the eastern portions of the state. However, when rain does occur, especially in western regions closer to the Pacific, it often comes in brief, localized showers. These showers, though infrequent, offer a refreshing reprieve from the summer warmth.

Rivers and lakes remain popular destinations. Their waters, having absorbed the summer heat, are at their warmest. This makes August an excellent time for water-based recreational activities, be it rafting on the Snake River or swimming in Lake Pend Oreille.

As August winds down and September approaches, there's a subtle shift in the atmosphere. While the days are still undeniably summery, the evenings carry a hint of the crispness that September will bring in full measure.

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• Boise - August »
  In August, the rain falls for 4.9 days. On the last day of August, in Boise, sunrise is at 7:08 am and sunset at 8:21 pm MDT.
• Meridian - August »
  The commencement of August in Meridian brings an average high-temperature of a still tropical 89.1°F (31.7°C), marking an inconsequential divergence from July. In Meridian in August, it is raining for 3.4 days, with typically 0.16" (4mm) of accumulated precipitation.
• Nampa - August »
  The months with the least rainfall in Nampa are July and August Rain falls for 3.1 days and accumulates 0.12" (3mm) of rain. July and August, with an average relative humidity of 29%, are the least humid months in Nampa, Idaho.
• Idaho Falls - August »
  The least humid month in Idaho Falls is August, with an average relative humidity of 35%. Upon the onset of August, Idaho Falls witnesses an average high-temperature of a warm 84.4°F (29.1°C), showing a close resemblance to the prior month.
• Pocatello - August »
  In Pocatello during August, the rain falls for 6.8 days and regularly aggregates up to 0.51" (13mm) of precipitation. August continues to bathe Pocatello, Idaho in warm summer conditions, though it's slightly cooler than scorching July.
• Caldwell - August »
  In Caldwell during August, the rain falls for 3.5 days and regularly aggregates up to 0.2" (5mm) of precipitation. August is the least humid month in Caldwell with an average relative humidity of 29%.
• Coeur d'Alene - August »
  August, characterized by an average high temperature of 82°F (27.8°C) and a low temperature of 51.6°F (10.9°C), is generally the warmest month in Coeur d'Alene. The months with the least rainfall in Coeur d'Alene are July and August Rain falls for 5.4 days and accumulates 0.43" (11mm) of rain.
• Twin Falls - August »
  July and August are months with the least rain in Twin Falls when the rain falls for 4.4 days and typically aggregates up to 0.24" (6mm) of rain. In Twin Falls during August, the rain falls for 4.4 days and regularly aggregates up to 0.24" (6mm) of precipitation.
• Lewiston - August »
  August is the warmest month in Lewiston, exhibiting average temperatures of 85.3°F (29.6°C) at the peak and 59.2°F (15.1°C) at the base. The least humid month in Lewiston is August, with an average relative humidity of 38%.
• Post Falls - August »
  The months with the least rainfall in Post Falls, Idaho, are July and August Rain falls for 5.6 days and accumulates 0.43" (11mm) of rain. The least humid month in Post Falls is August, with an average relative humidity of 48%.
• Rexburg - August »
  August is the least humid month in Rexburg with an average relative humidity of 38%. In Rexburg in August, it is raining for 8.3 days, with typically 0.63" (16mm) of accumulated precipitation.
• Moscow - August »
  The months with the least rainfall in Moscow are July and August Rain falls for 5.9 days and accumulates 0.47" (12mm) of rain. The least humid month in Moscow, Idaho, is August, with an average relative humidity of 40%.