Weather Almanac: Basin, MT 59631

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 1.23"
September days below freezing
📉 ≈6.9 days
Average September lows ≈36.4°F
USDA Zone
5a
Annual extreme lows -20°F to -15°F
Last Spring Frost (36°F)
🌷 Always
First Fall Frost (36°F)
🍂 Always
Mon. September 1 Labor Day  

🌅 6:50 a.m.

H: ≈76.3°F

L: ≈39.9°F

🌇 8:07 p.m.

Tue. September 2  

🌅 6:51 a.m.

H: ≈76.0°F

L: ≈39.6°F

🌇 8:05 p.m.

Wed. September 3  

🌅 6:52 a.m.

H: ≈75.5°F

L: ≈39.4°F

🌇 8:03 p.m.

Thu. September 4  

🌅 6:54 a.m.

H: ≈75.1°F

L: ≈39.2°F

🌇 8:01 p.m.

Fri. September 5  

🌅 6:55 a.m.

H: ≈74.7°F

L: ≈38.9°F

🌇 7:59 p.m.

Sat. September 6  

🌅 6:56 a.m.

H: ≈74.3°F

L: ≈38.7°F

🌇 7:57 p.m.

Sun. September 7 🌕

🌅 6:58 a.m.

H: ≈73.8°F

L: ≈38.4°F

🌇 7:55 p.m.

Mon. September 8  

🌅 6:59 a.m.

H: ≈73.4°F

L: ≈38.2°F

🌇 7:53 p.m.

Tue. September 9  

🌅 7:00 a.m.

H: ≈73.0°F

L: ≈38.0°F

🌇 7:51 p.m.

Wed. September 10  

🌅 7:01 a.m.

H: ≈72.5°F

L: ≈37.7°F

🌇 7:50 p.m.

Thu. September 11  

🌅 7:03 a.m.

H: ≈72.1°F

L: ≈37.5°F

🌇 7:48 p.m.

Fri. September 12  

🌅 7:04 a.m.

H: ≈71.6°F

L: ≈37.3°F

🌇 7:46 p.m.

Sat. September 13  

🌅 7:05 a.m.

H: ≈71.1°F

L: ≈37.0°F

🌇 7:44 p.m.

Sun. September 14 Holy Cross 🌗

🌅 7:06 a.m.

H: ≈70.7°F

L: ≈36.8°F

🌇 7:42 p.m.

Mon. September 15  

🌅 7:08 a.m.

H: ≈70.2°F

L: ≈36.6°F

🌇 7:40 p.m.

Tue. September 16  

🌅 7:09 a.m.

H: ≈69.7°F

L: ≈36.3°F

🌇 7:38 p.m.

Wed. September 17  

🌅 7:10 a.m.

H: ≈69.2°F

L: ≈36.1°F

🌇 7:36 p.m.

Thu. September 18  

🌅 7:11 a.m.

H: ≈68.8°F

L: ≈35.9°F

🌇 7:34 p.m.

Fri. September 19  

🌅 7:13 a.m.

H: ≈68.3°F

L: ≈35.6°F

🌇 7:32 p.m.

Sat. September 20  

🌅 7:14 a.m.

H: ≈67.8°F

L: ≈35.4°F

🌇 7:30 p.m.

Sun. September 21 🌑

🌅 7:15 a.m.

H: ≈67.4°F

L: ≈35.1°F

🌇 7:28 p.m.

Mon. September 22 Autumn Equinox  

🌅 7:17 a.m.

H: ≈66.9°F

L: ≈34.9°F

🌇 7:26 p.m.

Tue. September 23  

🌅 7:18 a.m.

H: ≈66.4°F

L: ≈34.6°F

🌇 7:24 p.m.

Wed. September 24  

🌅 7:19 a.m.

H: ≈66.0°F

L: ≈34.4°F

🌇 7:22 p.m.

Thu. September 25  

🌅 7:20 a.m.

H: ≈65.5°F

L: ≈34.1°F

🌇 7:20 p.m.

Fri. September 26  

🌅 7:22 a.m.

H: ≈65.0°F

L: ≈33.8°F

🌇 7:18 p.m.

Sat. September 27  

🌅 7:23 a.m.

H: ≈64.6°F

L: ≈33.6°F

🌇 7:16 p.m.

Sun. September 28  

🌅 7:24 a.m.

H: ≈64.1°F

L: ≈33.3°F

🌇 7:14 p.m.

Mon. September 29 🌓

🌅 7:26 a.m.

H: ≈63.7°F

L: ≈33.0°F

🌇 7:12 p.m.

Tue. September 30  

🌅 7:27 a.m.

H: ≈63.2°F

L: ≈32.7°F

🌇 7:10 p.m.


Temperature climatic data from weather station: ELLISTON (USC00242738)

Precipitation climatic data from weather station: ELLISTON (USC00242738)

Agricultural climatic data from weather station: BOULDER (USC00241008)