Weather Almanac: Big Horn, WY 82833

🗓️ Historical norms for September 2026

September avg. precipitation
🌧️ 1.54"
September days below freezing
📉 ≈0.8 days
Average September lows ≈44.1°F
USDA Zone
5a
Annual extreme lows -20°F to -15°F
Last Spring Frost (36°F)
🌷 Jun 14
First Fall Frost (36°F)
🍂 Sep 7
Tue. September 1  

🌅 6:31 a.m.

H: ≈80.6°F

L: ≈49.4°F

🌇 7:44 p.m.

Wed. September 2  

🌅 6:32 a.m.

H: ≈80.1°F

L: ≈49.1°F

🌇 7:42 p.m.

Thu. September 3  

🌅 6:33 a.m.

H: ≈79.6°F

L: ≈48.7°F

🌇 7:41 p.m.

Fri. September 4  

🌅 6:34 a.m.

H: ≈79.1°F

L: ≈48.4°F

🌇 7:39 p.m.

Sat. September 5  

🌅 6:35 a.m.

H: ≈78.6°F

L: ≈48.1°F

🌇 7:37 p.m.

Sun. September 6  

🌅 6:37 a.m.

H: ≈78.0°F

L: ≈47.7°F

🌇 7:35 p.m.

Mon. September 7 Labor Day  

🌅 6:38 a.m.

H: ≈77.5°F

L: ≈47.4°F

🌇 7:33 p.m.

Tue. September 8  

🌅 6:39 a.m.

H: ≈76.9°F

L: ≈47.0°F

🌇 7:31 p.m.

Wed. September 9  

🌅 6:40 a.m.

H: ≈76.3°F

L: ≈46.6°F

🌇 7:30 p.m.

Thu. September 10  

🌅 6:41 a.m.

H: ≈75.8°F

L: ≈46.3°F

🌇 7:28 p.m.

Fri. September 11  

🌅 6:42 a.m.

H: ≈75.2°F

L: ≈45.9°F

🌇 7:26 p.m.

Sat. September 12  

🌅 6:44 a.m.

H: ≈74.6°F

L: ≈45.5°F

🌇 7:24 p.m.

Sun. September 13  

🌅 6:45 a.m.

H: ≈74.0°F

L: ≈45.1°F

🌇 7:22 p.m.

Mon. September 14 Holy Cross  

🌅 6:46 a.m.

H: ≈73.4°F

L: ≈44.8°F

🌇 7:20 p.m.

Tue. September 15  

🌅 6:47 a.m.

H: ≈72.9°F

L: ≈44.4°F

🌇 7:18 p.m.

Wed. September 16  

🌅 6:48 a.m.

H: ≈72.3°F

L: ≈44.0°F

🌇 7:16 p.m.

Thu. September 17  

🌅 6:49 a.m.

H: ≈71.7°F

L: ≈43.6°F

🌇 7:15 p.m.

Fri. September 18  

🌅 6:51 a.m.

H: ≈71.1°F

L: ≈43.2°F

🌇 7:13 p.m.

Sat. September 19  

🌅 6:52 a.m.

H: ≈70.6°F

L: ≈42.8°F

🌇 7:11 p.m.

Sun. September 20  

🌅 6:53 a.m.

H: ≈70.0°F

L: ≈42.4°F

🌇 7:09 p.m.

Mon. September 21  

🌅 6:54 a.m.

H: ≈69.5°F

L: ≈42.0°F

🌇 7:07 p.m.

Tue. September 22 Autumn Equinox  

🌅 6:55 a.m.

H: ≈68.9°F

L: ≈41.6°F

🌇 7:05 p.m.

Wed. September 23  

🌅 6:57 a.m.

H: ≈68.4°F

L: ≈41.2°F

🌇 7:03 p.m.

Thu. September 24  

🌅 6:58 a.m.

H: ≈67.9°F

L: ≈40.8°F

🌇 7:01 p.m.

Fri. September 25  

🌅 6:59 a.m.

H: ≈67.4°F

L: ≈40.4°F

🌇 7:00 p.m.

Sat. September 26 🌕

🌅 7:00 a.m.

H: ≈67.0°F

L: ≈40.1°F

🌇 6:58 p.m.

Sun. September 27  

🌅 7:01 a.m.

H: ≈66.5°F

L: ≈39.7°F

🌇 6:56 p.m.

Mon. September 28  

🌅 7:02 a.m.

H: ≈66.1°F

L: ≈39.3°F

🌇 6:54 p.m.

Tue. September 29  

🌅 7:04 a.m.

H: ≈65.7°F

L: ≈38.9°F

🌇 6:52 p.m.

Wed. September 30  

🌅 7:05 a.m.

H: ≈65.3°F

L: ≈38.5°F

🌇 6:50 p.m.


Temperature climatic data from weather station: BIG HORN (USC00480680)

Precipitation climatic data from weather station: BIG HORN (USC00480680)

Agricultural climatic data from weather station: SHERIDAN CO AP (USW00024029)