Weather Almanac: Fort Shaw, MT 59443

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 1.19"
September days below freezing
📉 ≈4.0 days
Average September lows 38°F – 43°F
USDA Zone
4b
Annual extreme lows -25°F to -20°F
Last Spring Frost (36°F)
🌷 Always
First Fall Frost (36°F)
🍂 Always
Mon. September 1 Labor Day  

🌅 6:46 a.m.

H: 67°F – 87°F

L: 38°F – 51°F

🌇 8:06 p.m.

Tue. September 2  

🌅 6:47 a.m.

H: 66°F – 87°F

L: 38°F – 51°F

🌇 8:04 p.m.

Wed. September 3  

🌅 6:49 a.m.

H: 66°F – 87°F

L: 37°F – 51°F

🌇 8:02 p.m.

Thu. September 4  

🌅 6:50 a.m.

H: 65°F – 86°F

L: 37°F – 51°F

🌇 8:00 p.m.

Fri. September 5  

🌅 6:51 a.m.

H: 65°F – 86°F

L: 37°F – 50°F

🌇 7:58 p.m.

Sat. September 6  

🌅 6:53 a.m.

H: 64°F – 86°F

L: 36°F – 50°F

🌇 7:56 p.m.

Sun. September 7 🌕

🌅 6:54 a.m.

H: 64°F – 86°F

L: 36°F – 50°F

🌇 7:54 p.m.

Mon. September 8  

🌅 6:55 a.m.

H: 63°F – 85°F

L: 36°F – 50°F

🌇 7:52 p.m.

Tue. September 9  

🌅 6:57 a.m.

H: 63°F – 85°F

L: 35°F – 49°F

🌇 7:50 p.m.

Wed. September 10  

🌅 6:58 a.m.

H: 62°F – 85°F

L: 35°F – 49°F

🌇 7:48 p.m.

Thu. September 11  

🌅 6:59 a.m.

H: 62°F – 84°F

L: 35°F – 49°F

🌇 7:46 p.m.

Fri. September 12  

🌅 7:01 a.m.

H: 61°F – 84°F

L: 34°F – 49°F

🌇 7:44 p.m.

Sat. September 13  

🌅 7:02 a.m.

H: 61°F – 84°F

L: 34°F – 48°F

🌇 7:42 p.m.

Sun. September 14 Holy Cross 🌗

🌅 7:03 a.m.

H: 60°F – 83°F

L: 34°F – 48°F

🌇 7:40 p.m.

Mon. September 15  

🌅 7:05 a.m.

H: 60°F – 83°F

L: 33°F – 48°F

🌇 7:38 p.m.

Tue. September 16  

🌅 7:06 a.m.

H: 60°F – 83°F

L: 33°F – 48°F

🌇 7:36 p.m.

Wed. September 17  

🌅 7:07 a.m.

H: 59°F – 83°F

L: 33°F – 47°F

🌇 7:34 p.m.

Thu. September 18  

🌅 7:09 a.m.

H: 59°F – 82°F

L: 32°F – 47°F

🌇 7:32 p.m.

Fri. September 19  

🌅 7:10 a.m.

H: 58°F – 82°F

L: 32°F – 47°F

🌇 7:30 p.m.

Sat. September 20  

🌅 7:11 a.m.

H: 58°F – 82°F

L: 32°F – 47°F

🌇 7:28 p.m.

Sun. September 21 🌑

🌅 7:13 a.m.

H: 57°F – 81°F

L: 31°F – 47°F

🌇 7:26 p.m.

Mon. September 22 Autumn Equinox  

🌅 7:14 a.m.

H: 57°F – 81°F

L: 31°F – 46°F

🌇 7:24 p.m.

Tue. September 23  

🌅 7:16 a.m.

H: 56°F – 81°F

L: 30°F – 46°F

🌇 7:22 p.m.

Wed. September 24  

🌅 7:17 a.m.

H: 56°F – 80°F

L: 30°F – 46°F

🌇 7:20 p.m.

Thu. September 25  

🌅 7:18 a.m.

H: 56°F – 80°F

L: 30°F – 46°F

🌇 7:18 p.m.

Fri. September 26  

🌅 7:20 a.m.

H: 55°F – 80°F

L: 29°F – 45°F

🌇 7:15 p.m.

Sat. September 27  

🌅 7:21 a.m.

H: 55°F – 79°F

L: 29°F – 45°F

🌇 7:13 p.m.

Sun. September 28  

🌅 7:22 a.m.

H: 54°F – 79°F

L: 29°F – 45°F

🌇 7:11 p.m.

Mon. September 29 🌓

🌅 7:24 a.m.

H: 54°F – 79°F

L: 28°F – 45°F

🌇 7:09 p.m.

Tue. September 30  

🌅 7:25 a.m.

H: 54°F – 78°F

L: 28°F – 45°F

🌇 7:07 p.m.


Temperature climatic data from weather station: SUN RIVER 4 S (USC00248021)

Precipitation climatic data from weather station: SIMMS 1 NE (USC00247618)

Agricultural climatic data from weather station: SUN RIVER 4 S (USC00248021)