Long-Range Weather Forecast for Troy, ID

August 2026 Long Range Weather Forecast for Intermountain

Dates	Weather Conditions
Aug 1-11	Sunny, hot north; a few t-storms, warm south
Aug 12-15	Sunny, warm
Aug 16-22	Sunny, warm north; isolated t-storms, hot south
Aug 23-31	Isolated t-storms, warm
August	temperature 75° (2° above avg.) precipitation 1.1" (0.2" below avg. north, 0.3" above south)

September 2026 Long Range Weather Forecast for Intermountain

Dates	Weather Conditions
Sep 1-8	Sunny north, isolated t-storms south; warm
Sep 9-11	Sunny; hot north, warm south
Sep 12-21	Sunny, then a few showers; cool north, warm south
Sep 22-30	Sunny, then rainy periods; cool north, warm south
September	temperature 64.5° (1° below avg. north, 2° above south) precipitation 1.5" (0.5" above avg.)

12-Month Long-Range Weather Outlook

November 2025 to October 2026

Winter will be warmer than normal, with the coldest periods in late November, early December, and early February. Precipitation will be slightly above normal, with below-normal snowfall in the north and above-normal south. The snowiest periods will be in late January, early February, and late March. April and May look cooler and wetter than normal in the north, and warmer and drier south. Summer will be cooler and drier than usual in the north, while the south will be hotter and wetter. The hottest periods will be in mid- to late June, mid- to late July, and early to mid-August. September and October will be cooler than normal in the north but warmer south. Precipitation will be above normal.

See the complete 12-month weather forecast in The Old Farmer’s Almanac..

Weather Trend Graph

November 2025 to October 2026