Weather Almanac: Poplar Grove, IL 61065

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 3.56"
September days below freezing
📉 ≈0.4 days
Average September lows ≈50.0°F
USDA Zone
5b
Annual extreme lows -15°F to -10°F
Last Spring Frost (36°F)
🌷 May 12
First Fall Frost (36°F)
🍂 Sep 28
Mon. September 1 Labor Day  

🌅 6:20 a.m.

H: ≈78.2°F

L: ≈56.3°F

🌇 7:28 p.m.

Tue. September 2  

🌅 6:21 a.m.

H: ≈77.9°F

L: ≈56.0°F

🌇 7:27 p.m.

Wed. September 3  

🌅 6:22 a.m.

H: ≈77.7°F

L: ≈55.6°F

🌇 7:25 p.m.

Thu. September 4  

🌅 6:24 a.m.

H: ≈77.4°F

L: ≈55.3°F

🌇 7:23 p.m.

Fri. September 5  

🌅 6:25 a.m.

H: ≈77.1°F

L: ≈54.9°F

🌇 7:21 p.m.

Sat. September 6  

🌅 6:26 a.m.

H: ≈76.9°F

L: ≈54.5°F

🌇 7:20 p.m.

Sun. September 7 🌕

🌅 6:27 a.m.

H: ≈76.6°F

L: ≈54.1°F

🌇 7:18 p.m.

Mon. September 8  

🌅 6:28 a.m.

H: ≈76.3°F

L: ≈53.6°F

🌇 7:16 p.m.

Tue. September 9  

🌅 6:29 a.m.

H: ≈75.9°F

L: ≈53.2°F

🌇 7:14 p.m.

Wed. September 10  

🌅 6:30 a.m.

H: ≈75.6°F

L: ≈52.7°F

🌇 7:13 p.m.

Thu. September 11  

🌅 6:31 a.m.

H: ≈75.3°F

L: ≈52.3°F

🌇 7:11 p.m.

Fri. September 12  

🌅 6:32 a.m.

H: ≈74.9°F

L: ≈51.8°F

🌇 7:09 p.m.

Sat. September 13  

🌅 6:33 a.m.

H: ≈74.5°F

L: ≈51.3°F

🌇 7:07 p.m.

Sun. September 14 Holy Cross 🌗

🌅 6:34 a.m.

H: ≈74.2°F

L: ≈50.8°F

🌇 7:06 p.m.

Mon. September 15  

🌅 6:35 a.m.

H: ≈73.8°F

L: ≈50.4°F

🌇 7:04 p.m.

Tue. September 16  

🌅 6:36 a.m.

H: ≈73.4°F

L: ≈49.9°F

🌇 7:02 p.m.

Wed. September 17  

🌅 6:37 a.m.

H: ≈73.0°F

L: ≈49.4°F

🌇 7:00 p.m.

Thu. September 18  

🌅 6:38 a.m.

H: ≈72.6°F

L: ≈48.9°F

🌇 6:59 p.m.

Fri. September 19  

🌅 6:39 a.m.

H: ≈72.2°F

L: ≈48.4°F

🌇 6:57 p.m.

Sat. September 20  

🌅 6:40 a.m.

H: ≈71.8°F

L: ≈47.9°F

🌇 6:55 p.m.

Sun. September 21 🌑

🌅 6:41 a.m.

H: ≈71.3°F

L: ≈47.4°F

🌇 6:53 p.m.

Mon. September 22 Autumn Equinox  

🌅 6:43 a.m.

H: ≈70.9°F

L: ≈46.9°F

🌇 6:51 p.m.

Tue. September 23  

🌅 6:44 a.m.

H: ≈70.5°F

L: ≈46.4°F

🌇 6:50 p.m.

Wed. September 24  

🌅 6:45 a.m.

H: ≈70.0°F

L: ≈45.9°F

🌇 6:48 p.m.

Thu. September 25  

🌅 6:46 a.m.

H: ≈69.6°F

L: ≈45.5°F

🌇 6:46 p.m.

Fri. September 26  

🌅 6:47 a.m.

H: ≈69.2°F

L: ≈45.0°F

🌇 6:44 p.m.

Sat. September 27  

🌅 6:48 a.m.

H: ≈68.7°F

L: ≈44.6°F

🌇 6:43 p.m.

Sun. September 28  

🌅 6:49 a.m.

H: ≈68.3°F

L: ≈44.1°F

🌇 6:41 p.m.

Mon. September 29 🌓

🌅 6:50 a.m.

H: ≈67.8°F

L: ≈43.7°F

🌇 6:39 p.m.

Tue. September 30  

🌅 6:51 a.m.

H: ≈67.4°F

L: ≈43.3°F

🌇 6:37 p.m.


Temperature climatic data from weather station: CLINTON (USC00471667)

Precipitation climatic data from weather station: CLINTON (USC00471667)

Agricultural climatic data from weather station: BELOIT (USC00470696)