Weather Almanac: Sister Bay, WI 54234

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 3.28"
September days below freezing
📉 ≈0.0 days
Average September lows ≈51.8°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 Jun 1
First Fall Frost (36°F)
🍂 Sep 28
Mon. September 1 Labor Day  

🌅 6:10 a.m.

H: ≈74.4°F

L: ≈55.9°F

🌇 7:25 p.m.

Tue. September 2  

🌅 6:11 a.m.

H: ≈74.2°F

L: ≈55.7°F

🌇 7:23 p.m.

Wed. September 3  

🌅 6:13 a.m.

H: ≈73.9°F

L: ≈55.6°F

🌇 7:21 p.m.

Thu. September 4  

🌅 6:14 a.m.

H: ≈73.6°F

L: ≈55.3°F

🌇 7:19 p.m.

Fri. September 5  

🌅 6:15 a.m.

H: ≈73.3°F

L: ≈55.1°F

🌇 7:17 p.m.

Sat. September 6  

🌅 6:16 a.m.

H: ≈73.0°F

L: ≈54.9°F

🌇 7:15 p.m.

Sun. September 7 🌕

🌅 6:17 a.m.

H: ≈72.7°F

L: ≈54.7°F

🌇 7:13 p.m.

Mon. September 8  

🌅 6:19 a.m.

H: ≈72.3°F

L: ≈54.4°F

🌇 7:11 p.m.

Tue. September 9  

🌅 6:20 a.m.

H: ≈72.0°F

L: ≈54.1°F

🌇 7:10 p.m.

Wed. September 10  

🌅 6:21 a.m.

H: ≈71.6°F

L: ≈53.9°F

🌇 7:08 p.m.

Thu. September 11  

🌅 6:22 a.m.

H: ≈71.2°F

L: ≈53.6°F

🌇 7:06 p.m.

Fri. September 12  

🌅 6:23 a.m.

H: ≈70.9°F

L: ≈53.3°F

🌇 7:04 p.m.

Sat. September 13  

🌅 6:24 a.m.

H: ≈70.5°F

L: ≈53.0°F

🌇 7:02 p.m.

Sun. September 14 Holy Cross 🌗

🌅 6:26 a.m.

H: ≈70.0°F

L: ≈52.6°F

🌇 7:00 p.m.

Mon. September 15  

🌅 6:27 a.m.

H: ≈69.6°F

L: ≈52.3°F

🌇 6:58 p.m.

Tue. September 16  

🌅 6:28 a.m.

H: ≈69.2°F

L: ≈52.0°F

🌇 6:56 p.m.

Wed. September 17  

🌅 6:29 a.m.

H: ≈68.8°F

L: ≈51.6°F

🌇 6:54 p.m.

Thu. September 18  

🌅 6:31 a.m.

H: ≈68.3°F

L: ≈51.3°F

🌇 6:52 p.m.

Fri. September 19  

🌅 6:32 a.m.

H: ≈67.9°F

L: ≈50.9°F

🌇 6:50 p.m.

Sat. September 20  

🌅 6:33 a.m.

H: ≈67.4°F

L: ≈50.5°F

🌇 6:49 p.m.

Sun. September 21 🌑

🌅 6:34 a.m.

H: ≈67.0°F

L: ≈50.1°F

🌇 6:47 p.m.

Mon. September 22 Autumn Equinox  

🌅 6:35 a.m.

H: ≈66.5°F

L: ≈49.7°F

🌇 6:45 p.m.

Tue. September 23  

🌅 6:37 a.m.

H: ≈66.0°F

L: ≈49.4°F

🌇 6:43 p.m.

Wed. September 24  

🌅 6:38 a.m.

H: ≈65.5°F

L: ≈49.0°F

🌇 6:41 p.m.

Thu. September 25  

🌅 6:39 a.m.

H: ≈65.1°F

L: ≈48.5°F

🌇 6:39 p.m.

Fri. September 26  

🌅 6:40 a.m.

H: ≈64.6°F

L: ≈48.1°F

🌇 6:37 p.m.

Sat. September 27  

🌅 6:41 a.m.

H: ≈64.1°F

L: ≈47.7°F

🌇 6:35 p.m.

Sun. September 28  

🌅 6:43 a.m.

H: ≈63.6°F

L: ≈47.3°F

🌇 6:33 p.m.

Mon. September 29 🌓

🌅 6:44 a.m.

H: ≈63.2°F

L: ≈46.9°F

🌇 6:31 p.m.

Tue. September 30  

🌅 6:45 a.m.

H: ≈62.7°F

L: ≈46.5°F

🌇 6:29 p.m.


Temperature climatic data from weather station: EPHRAIM 1NE-WWTP (USC00472626)

Precipitation climatic data from weather station: EPHRAIM 1NE-WWTP (USC00472626)

Agricultural climatic data from weather station: WASHINGTON IS (USC00478905)