Weather Almanac: Casper, WY 82609

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 1.13"
September days below freezing
📉 ≈0.6 days
Average September lows ≈44.1°F
USDA Zone
5a
Annual extreme lows -20°F to -15°F
Last Spring Frost (36°F)
🌷 Jun 12
First Fall Frost (36°F)
🍂 Sep 9
Mon. September 1 Labor Day  

🌅 6:29 a.m.

H: ≈81.8°F

L: ≈50.4°F

🌇 7:38 p.m.

Tue. September 2  

🌅 6:31 a.m.

H: ≈81.4°F

L: ≈50.0°F

🌇 7:36 p.m.

Wed. September 3  

🌅 6:32 a.m.

H: ≈81.0°F

L: ≈49.5°F

🌇 7:35 p.m.

Thu. September 4  

🌅 6:33 a.m.

H: ≈80.5°F

L: ≈49.1°F

🌇 7:33 p.m.

Fri. September 5  

🌅 6:34 a.m.

H: ≈80.1°F

L: ≈48.6°F

🌇 7:31 p.m.

Sat. September 6  

🌅 6:35 a.m.

H: ≈79.6°F

L: ≈48.2°F

🌇 7:29 p.m.

Sun. September 7 🌕

🌅 6:36 a.m.

H: ≈79.1°F

L: ≈47.7°F

🌇 7:28 p.m.

Mon. September 8  

🌅 6:37 a.m.

H: ≈78.6°F

L: ≈47.3°F

🌇 7:26 p.m.

Tue. September 9  

🌅 6:38 a.m.

H: ≈78.2°F

L: ≈46.8°F

🌇 7:24 p.m.

Wed. September 10  

🌅 6:39 a.m.

H: ≈77.7°F

L: ≈46.4°F

🌇 7:22 p.m.

Thu. September 11  

🌅 6:40 a.m.

H: ≈77.2°F

L: ≈45.9°F

🌇 7:20 p.m.

Fri. September 12  

🌅 6:41 a.m.

H: ≈76.7°F

L: ≈45.5°F

🌇 7:19 p.m.

Sat. September 13  

🌅 6:42 a.m.

H: ≈76.1°F

L: ≈45.0°F

🌇 7:17 p.m.

Sun. September 14 Holy Cross 🌗

🌅 6:43 a.m.

H: ≈75.6°F

L: ≈44.6°F

🌇 7:15 p.m.

Mon. September 15  

🌅 6:44 a.m.

H: ≈75.1°F

L: ≈44.1°F

🌇 7:13 p.m.

Tue. September 16  

🌅 6:46 a.m.

H: ≈74.6°F

L: ≈43.7°F

🌇 7:12 p.m.

Wed. September 17  

🌅 6:47 a.m.

H: ≈74.1°F

L: ≈43.3°F

🌇 7:10 p.m.

Thu. September 18  

🌅 6:48 a.m.

H: ≈73.6°F

L: ≈42.9°F

🌇 7:08 p.m.

Fri. September 19  

🌅 6:49 a.m.

H: ≈73.0°F

L: ≈42.4°F

🌇 7:06 p.m.

Sat. September 20  

🌅 6:50 a.m.

H: ≈72.5°F

L: ≈42.0°F

🌇 7:04 p.m.

Sun. September 21 🌑

🌅 6:51 a.m.

H: ≈72.0°F

L: ≈41.6°F

🌇 7:03 p.m.

Mon. September 22 Autumn Equinox  

🌅 6:52 a.m.

H: ≈71.5°F

L: ≈41.2°F

🌇 7:01 p.m.

Tue. September 23  

🌅 6:53 a.m.

H: ≈71.0°F

L: ≈40.8°F

🌇 6:59 p.m.

Wed. September 24  

🌅 6:54 a.m.

H: ≈70.5°F

L: ≈40.5°F

🌇 6:57 p.m.

Thu. September 25  

🌅 6:55 a.m.

H: ≈70.0°F

L: ≈40.1°F

🌇 6:55 p.m.

Fri. September 26  

🌅 6:56 a.m.

H: ≈69.5°F

L: ≈39.7°F

🌇 6:54 p.m.

Sat. September 27  

🌅 6:58 a.m.

H: ≈69.0°F

L: ≈39.4°F

🌇 6:52 p.m.

Sun. September 28  

🌅 6:59 a.m.

H: ≈68.5°F

L: ≈39.0°F

🌇 6:50 p.m.

Mon. September 29 🌓

🌅 7:00 a.m.

H: ≈68.0°F

L: ≈38.7°F

🌇 6:48 p.m.

Tue. September 30  

🌅 7:01 a.m.

H: ≈67.5°F

L: ≈38.4°F

🌇 6:47 p.m.


Temperature climatic data from weather station: CASPER WWTP (USC00481569)

Precipitation climatic data from weather station: CASPER 1SW (USC00481572)

Agricultural climatic data from weather station: BATES CREEK #2 (USC00480552)