Weather Almanac: Claremont, CA 91711

🗓️ Historical norms for September 2025

September avg. precipitation
🌧️ 0.15"
September days below freezing
📉 ≈0.0 days
Average September lows 58°F – 63°F
USDA Zone
10a
Annual extreme lows 30°F to 35°F
Last Spring Frost (36°F)
🌷 Feb 24
First Fall Frost (36°F)
🍂 Dec 2
Mon. September 1 Labor Day  

🌅 6:24 a.m.

H: 84°F – 99°F

L: 56°F – 67°F

🌇 7:16 p.m.

Tue. September 2  

🌅 6:25 a.m.

H: 84°F – 99°F

L: 56°F – 67°F

🌇 7:14 p.m.

Wed. September 3  

🌅 6:26 a.m.

H: 84°F – 99°F

L: 56°F – 67°F

🌇 7:13 p.m.

Thu. September 4  

🌅 6:26 a.m.

H: 83°F – 99°F

L: 56°F – 67°F

🌇 7:12 p.m.

Fri. September 5  

🌅 6:27 a.m.

H: 83°F – 99°F

L: 56°F – 67°F

🌇 7:10 p.m.

Sat. September 6  

🌅 6:28 a.m.

H: 83°F – 99°F

L: 56°F – 67°F

🌇 7:09 p.m.

Sun. September 7 🌕

🌅 6:28 a.m.

H: 83°F – 99°F

L: 56°F – 67°F

🌇 7:07 p.m.

Mon. September 8  

🌅 6:29 a.m.

H: 83°F – 99°F

L: 56°F – 66°F

🌇 7:06 p.m.

Tue. September 9  

🌅 6:30 a.m.

H: 83°F – 98°F

L: 56°F – 66°F

🌇 7:05 p.m.

Wed. September 10  

🌅 6:30 a.m.

H: 82°F – 98°F

L: 56°F – 66°F

🌇 7:03 p.m.

Thu. September 11  

🌅 6:31 a.m.

H: 82°F – 98°F

L: 56°F – 66°F

🌇 7:02 p.m.

Fri. September 12  

🌅 6:32 a.m.

H: 82°F – 98°F

L: 56°F – 66°F

🌇 7:01 p.m.

Sat. September 13  

🌅 6:32 a.m.

H: 82°F – 98°F

L: 56°F – 66°F

🌇 6:59 p.m.

Sun. September 14 Holy Cross 🌗

🌅 6:33 a.m.

H: 81°F – 98°F

L: 56°F – 66°F

🌇 6:58 p.m.

Mon. September 15  

🌅 6:34 a.m.

H: 81°F – 97°F

L: 56°F – 66°F

🌇 6:56 p.m.

Tue. September 16  

🌅 6:35 a.m.

H: 81°F – 97°F

L: 55°F – 66°F

🌇 6:55 p.m.

Wed. September 17  

🌅 6:35 a.m.

H: 81°F – 97°F

L: 55°F – 66°F

🌇 6:54 p.m.

Thu. September 18  

🌅 6:36 a.m.

H: 80°F – 97°F

L: 55°F – 65°F

🌇 6:52 p.m.

Fri. September 19  

🌅 6:37 a.m.

H: 80°F – 97°F

L: 55°F – 65°F

🌇 6:51 p.m.

Sat. September 20  

🌅 6:37 a.m.

H: 80°F – 96°F

L: 55°F – 65°F

🌇 6:49 p.m.

Sun. September 21 🌑

🌅 6:38 a.m.

H: 79°F – 96°F

L: 55°F – 65°F

🌇 6:48 p.m.

Mon. September 22 Autumn Equinox  

🌅 6:39 a.m.

H: 79°F – 96°F

L: 55°F – 65°F

🌇 6:46 p.m.

Tue. September 23  

🌅 6:39 a.m.

H: 79°F – 95°F

L: 55°F – 65°F

🌇 6:45 p.m.

Wed. September 24  

🌅 6:40 a.m.

H: 78°F – 95°F

L: 54°F – 64°F

🌇 6:44 p.m.

Thu. September 25  

🌅 6:41 a.m.

H: 78°F – 95°F

L: 54°F – 64°F

🌇 6:42 p.m.

Fri. September 26  

🌅 6:42 a.m.

H: 78°F – 94°F

L: 54°F – 64°F

🌇 6:41 p.m.

Sat. September 27  

🌅 6:42 a.m.

H: 77°F – 94°F

L: 54°F – 64°F

🌇 6:39 p.m.

Sun. September 28  

🌅 6:43 a.m.

H: 77°F – 94°F

L: 54°F – 63°F

🌇 6:38 p.m.

Mon. September 29 🌓

🌅 6:44 a.m.

H: 77°F – 94°F

L: 53°F – 63°F

🌇 6:37 p.m.

Tue. September 30  

🌅 6:44 a.m.

H: 76°F – 93°F

L: 53°F – 63°F

🌇 6:35 p.m.


Temperature climatic data from weather station: POMONA/FAIRPLEX (USC00047050)

Precipitation climatic data from weather station: POMONA/FAIRPLEX (USC00047050)

Agricultural climatic data from weather station: ONTARIO INTL AP (USW00003102)