easeweather.com
Rancho Cucamonga (CA)
Akron (OH)Albuquerque (NM)Alexandria (VA)Anaheim (CA)Anchorage (AK)Arlington (VA)Asheville (NC)Atlanta (GA)Atlantic City (NJ)Austin (TX)Baltimore (MD)Baton Rouge (LA)Birmingham (AL)Boston (MA)Brooklyn (NY)Buffalo (NY)Cape Coral (FL)Charlotte (NC)Chattanooga (TN)Chicago (IL)Cincinnati (OH)Cleveland (OH)Colorado Springs (CO)Columbus (OH)Corpus Christi (TX)Dallas (TX)Dayton (OH)Denver (CO)Des Moines (IA)Detroit (MI)El Paso (TX)Fairbanks (AK)Fort Lauderdale (FL)Fort Wayne (IN)Fort Worth (TX)Gatlinburg (TN)Grand Rapids (MI)Harrisburg (PA)Honolulu (HI)Houston (TX)Huntsville (AL)Indianapolis (IN)Jackson (MS)Jacksonville (FL)Juneau (AK)Kansas City (MO)Ketchikan (AK)Key West (FL)Knoxville (TN)Las Vegas (NV)Lexington (KY)Lincoln (NE)Little Rock (AR)Los Angeles (CA)Louisville (KY)Madison (WI)Manhattan (NY)Memphis (TN)Miami (FL)Milwaukee (WI)Minneapolis (MN)Mobile (AL)Montgomery (AL)Nashville (TN)New Orleans (LA)New York City (NY)Newark (NJ)Norfolk (VA)Oklahoma City (OK)Omaha (NE)Orlando (FL)Philadelphia (PA)Phoenix (AZ)Pittsburgh (PA)Portland (OR)
Rancho Cucamonga (CA)
Richmond (VA)Riverside (CA)Sacramento (CA)Salt Lake City (UT)San Antonio (TX)San Diego (CA)San Francisco (CA)San Jose (CA)Savannah (GA)Seattle (WA)Skagway (AK)Springfield (MO)St. Louis (MO)St. Petersburg (FL)Tallahassee (FL)Tampa (FL)Toledo (OH)Traverse City (MI)Tulsa (OK)Tyler (TX)Vancouver (WA)Virginia Beach (VA)WashingtonWichita (KS)Winston-Salem (NC) More Locations
United States weather

Weather in Rancho Cucamonga, California for December 2025

Your guide to Rancho Cucamonga weather in December - trends and predictions

    Temperatures

  • So far, December 2025 in Rancho Cucamonga is slightly warmer than the historical average by 1.3 °F.

  • Expect cooler weather in the next days in Rancho Cucamonga with the forecast suggesting a temperature of 17.9 °F, lower than the historical average.

  • In general, the average temperature in Rancho Cucamonga at the beginning of December is 21.1 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.4 °F by the end of December.

    • Rain 🌧️

  • Rancho Cucamonga experiences moderate rainfall in December, with an average of 6 rainy days and a total precipitation of 21.7 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
25
Dry days
Average rainy days
6
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/9°
Temperatures
Average wind speed
9 km/h
Avg max wind
Average humidity
39 %
Avg humidity

Rancho Cucamonga Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Sunny
20°
2
Sunny
19°
3
Sunny
20°
4
Sunny
21°
5
Sunny
23°
6
Sunny
23°
7
Partly cloudy
22°
8
Sunny
21°
9
Sunny
21°
10
Sunny
23°
11
Overcast
22°
12
Sunny
18°
13
Sunny
18°
14
Overcast
20°
15
Partly cloudy
22°
16
Sunny
24°
17
Sunny
25°
18
Sunny
29°
19
Sunny
23°
20
Sunny
21°
21
Sunny
20°
22
Sunny
21°
23
Patchy rain possible
18°
24
Moderate rain
14°
25
Moderate rain
15°
26
Moderate rain
11°
27
Moderate rain
10°
28
Partly cloudy
12°
29
Sunny
14°
30
Sunny
17°
31
Light rain shower
15°

Temperatures trend during December in Rancho Cucamonga

See the weather trend as well as the moving average line

December weather in Rancho Cucamonga day by day

Click on a date for more information
November January
Date Weather Temperatures Rain UV More
Dec. 1 Sunny
Sunny
 20° /8° 0 mm 5
Dec. 2 Sunny
Sunny
 19° /7° 0 mm 5
Dec. 3 Sunny
Sunny
 20° /7° 0 mm 5
Dec. 4 Sunny
Sunny
 21° /8° 0 mm 5
Dec. 5 Sunny
Sunny
 23° /9° 0 mm 6
Dec. 6 Sunny
Sunny
 23° /11° 0 mm 6
Dec. 7 Partly cloudy
Partly cloudy
 22° /9° 0 mm 6
Dec. 8 Sunny
Sunny
 21° /9° 0 mm 5
Dec. 9 Sunny
Sunny
 21° /8° 0 mm 6
Dec. 10 Sunny
Sunny
 23° /9° 0 mm 6
Dec. 11 Overcast
Overcast
 22° /11° 0 mm 6
Dec. 12 Sunny
Sunny
 18° /9° 0 mm 5
Dec. 13 Sunny
Sunny
 18° /8° 0 mm 5
Dec. 14 Overcast
Overcast
 20° /10° 0 mm 5
Dec. 15 Partly cloudy
Partly cloudy
 22° /8° 0 mm 6
Dec. 16 Sunny
Sunny
 24° /11° 0 mm 6
Dec. 17 Sunny
Sunny
 25° /11° 0 mm 0.7
Dec. 18 Sunny
Sunny
 29° /12° 0 mm 0.7
Dec. 19 Sunny
Sunny
 23° /14° 0 mm 0.6
Dec. 20 Sunny
Sunny
 21° /11° 0 mm 0.6
Dec. 21 Sunny
Sunny
 20° /11° 0 mm 0.6
Dec. 22 Sunny
Sunny
 21° /12° 0 mm 0
Dec. 23 Patchy rain possible
Patchy rain possible
 18° /13° 0.3 mm 4
Dec. 24 Moderate rain
Moderate rain
 14° /14° 9.7 mm 3
Dec. 25 Moderate rain
Moderate rain
 15° /10° 14.6 mm 3
Dec. 26 Moderate rain
Moderate rain
 11° /9° 7.9 mm 2
Dec. 27 Moderate rain
Moderate rain
 10° /8° 6.9 mm 2
Dec. 28 Partly cloudy
Partly cloudy
 12° /6° 0 mm 3
Dec. 29 Sunny
Sunny
 14° /6° 0 mm 3
Dec. 30 Sunny
Sunny
 17° /5° 0 mm 4
Dec. 31 Light rain shower
Light rain shower
 15° /6° 1.9 mm 4
Next
Important Notice
Our weather forecast for Rancho Cucamonga in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Rancho Cucamonga forecast closer to your planned date for the most up-to-date weather information.
Change Month
‹
›

Rancho Cucamonga in December - FAQ

What are the expected maximum and minimum temperatures in Rancho Cucamonga during December?
Enjoy moderate daytime temperatures of up to 19° and cooler nights around 9°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Rancho Cucamonga during December?
In December, Rancho Cucamonga can expect light to moderate rainfall, totaling 21.7 mm across approximately 6 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Rancho Cucamonga during December?
The average wind speed in Rancho Cucamonga during December is 9 km/h, suggesting breezy to windy conditions, depending on your activities.

December rainfall patterns in Rancho Cucamonga

Explore the daily rainfall trends and prepare for Rancho Cucamongas December weather 💧
Typically, Rancho Cucamonga has 6 rainy days in December with a total of 21.7 mm of rainfall.

UV exposure in Rancho Cucamonga during December

Stay informed about UV levels for safe outdoor activities throughout the month of December ☀️

Quick links

More Rancho Cucamonga weather pages
You are here
Location coordinates Where is Rancho Cucamonga?

Get accurate weather forecasts for Rancho Cucamonga, located at latitude 34.106 and longitude -117.593. Stay updated with localized weather information tailored for Rancho Cucamonga.

Found a mistake?
We appreciate your attention to details. Tell us here.