Weather Almanac: Hays, MT 59527

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 1.25"
September days below freezing
📉 ≈14.9 days
Average September lows ≈32.0°F
USDA Zone
4b
Annual extreme lows -25°F to -20°F
Last Spring Frost (36°F)
🌷 Jun 1
First Fall Frost (36°F)
🍂 Sep 9
Mon. September 1 Labor Day  

🌅 6:33 a.m.

H: ≈78.6°F

L: ≈35.6°F

🌇 7:55 p.m.

Tue. September 2  

🌅 6:34 a.m.

H: ≈78.2°F

L: ≈35.3°F

🌇 7:53 p.m.

Wed. September 3  

🌅 6:36 a.m.

H: ≈77.8°F

L: ≈35.0°F

🌇 7:51 p.m.

Thu. September 4  

🌅 6:37 a.m.

H: ≈77.3°F

L: ≈34.7°F

🌇 7:49 p.m.

Fri. September 5  

🌅 6:39 a.m.

H: ≈76.9°F

L: ≈34.4°F

🌇 7:47 p.m.

Sat. September 6  

🌅 6:40 a.m.

H: ≈76.4°F

L: ≈34.1°F

🌇 7:45 p.m.

Sun. September 7 🌕

🌅 6:41 a.m.

H: ≈76.0°F

L: ≈33.8°F

🌇 7:43 p.m.

Mon. September 8  

🌅 6:43 a.m.

H: ≈75.6°F

L: ≈33.5°F

🌇 7:40 p.m.

Tue. September 9  

🌅 6:44 a.m.

H: ≈75.1°F

L: ≈33.3°F

🌇 7:38 p.m.

Wed. September 10  

🌅 6:45 a.m.

H: ≈74.7°F

L: ≈33.0°F

🌇 7:36 p.m.

Thu. September 11  

🌅 6:47 a.m.

H: ≈74.2°F

L: ≈32.8°F

🌇 7:34 p.m.

Fri. September 12  

🌅 6:48 a.m.

H: ≈73.8°F

L: ≈32.6°F

🌇 7:32 p.m.

Sat. September 13  

🌅 6:49 a.m.

H: ≈73.4°F

L: ≈32.4°F

🌇 7:30 p.m.

Sun. September 14 Holy Cross 🌗

🌅 6:51 a.m.

H: ≈72.9°F

L: ≈32.1°F

🌇 7:28 p.m.

Mon. September 15  

🌅 6:52 a.m.

H: ≈72.5°F

L: ≈31.9°F

🌇 7:26 p.m.

Tue. September 16  

🌅 6:54 a.m.

H: ≈72.1°F

L: ≈31.7°F

🌇 7:24 p.m.

Wed. September 17  

🌅 6:55 a.m.

H: ≈71.7°F

L: ≈31.5°F

🌇 7:22 p.m.

Thu. September 18  

🌅 6:56 a.m.

H: ≈71.3°F

L: ≈31.3°F

🌇 7:20 p.m.

Fri. September 19  

🌅 6:58 a.m.

H: ≈70.8°F

L: ≈31.1°F

🌇 7:18 p.m.

Sat. September 20  

🌅 6:59 a.m.

H: ≈70.4°F

L: ≈30.9°F

🌇 7:16 p.m.

Sun. September 21 🌑

🌅 7:00 a.m.

H: ≈70.0°F

L: ≈30.8°F

🌇 7:13 p.m.

Mon. September 22 Autumn Equinox  

🌅 7:02 a.m.

H: ≈69.6°F

L: ≈30.6°F

🌇 7:11 p.m.

Tue. September 23  

🌅 7:03 a.m.

H: ≈69.2°F

L: ≈30.4°F

🌇 7:09 p.m.

Wed. September 24  

🌅 7:05 a.m.

H: ≈68.8°F

L: ≈30.2°F

🌇 7:07 p.m.

Thu. September 25  

🌅 7:06 a.m.

H: ≈68.4°F

L: ≈30.0°F

🌇 7:05 p.m.

Fri. September 26  

🌅 7:07 a.m.

H: ≈68.0°F

L: ≈29.8°F

🌇 7:03 p.m.

Sat. September 27  

🌅 7:09 a.m.

H: ≈67.6°F

L: ≈29.6°F

🌇 7:01 p.m.

Sun. September 28  

🌅 7:10 a.m.

H: ≈67.2°F

L: ≈29.4°F

🌇 6:59 p.m.

Mon. September 29 🌓

🌅 7:12 a.m.

H: ≈66.8°F

L: ≈29.2°F

🌇 6:57 p.m.

Tue. September 30  

🌅 7:13 a.m.

H: ≈66.4°F

L: ≈28.9°F

🌇 6:55 p.m.


Temperature climatic data from weather station: HARLEM 20S (USC00243934)

Precipitation climatic data from weather station: HARLEM 20S (USC00243934)

Agricultural climatic data from weather station: ROY 24 NE MOBRIDGE (USC00247234)