Rancho Cucamonga
January
Weather in Rancho Cucamonga for January 2026
Your guide to Rancho Cucamonga weather in January - trends and predictions
In general, the average temperature in Rancho Cucamonga at the beginning of January is 16.6 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 16.1 °F by the end of January.
Rancho Cucamonga experiences moderate rainfall in January, with an average of 7 rainy days and a total precipitation of 49.9 mm.
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Temperatures
Rain 🌧️
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24
Dry days
7
Rainy days
0
Snow days
16°/6°
Temperatures
12 km/h
Avg max wind
44 %
Avg humidity
Rancho Cucamonga Weather January
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  18° | 2  21° | 3  15° | ||||
| 4 15° | 5 17° | 6  17° | 7 13° | 8  14° | 9 17° | 10 16° |
| 11 16° | 12 15° | 13 14° | 14 15° | 15 17° | 16 19° | 17 13° |
| 18 18° | 19 18° | 20 15° | 21 12° | 22 16° | 23 17° | 24 18° |
| 25 15° | 26 14° | 27 16° | 28 16° | 29 17° | 30 17° | 31 18° |
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Access Rancho Cucamonga weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during January in Rancho Cucamonga
See the weather trend as well as the moving average line
January weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Jan. 1 | Partly cloudy | 18° /7° | 0 mm | 5 | |
| Jan. 2 | Overcast | 21° /8° | 0 mm | 6 | |
| Jan. 3 | Light rain shower | 15° /9° | 4.5 mm | 4 | |
| Jan. 4 | Overcast | 15° /5° | 0 mm | 4 | |
| Jan. 5 | Partly cloudy | 17° /6° | 0 mm | 5 | |
| Jan. 6 | Sunny | 17° /7° | 0 mm | 5 | |
| Jan. 7 | Patchy rain possible | 13° /5° | 1 mm | 3 | |
| Jan. 8 | Cloudy | 14° /4° | 0.1 mm | 4 | |
| Jan. 9 | Sunny | 17° /6° | 0 mm | 5 | |
| Jan. 10 | Sunny | 16° /4° | 0 mm | 5 | |
| Jan. 11 | Patchy rain possible | 16° /4° | 0.1 mm | 4 | |
| Jan. 12 | Sunny | 15° /4° | 0 mm | 5 | |
| Jan. 13 | Sunny | 14° /4° | 0 mm | 4 | |
| Jan. 14 | Sunny | 15° /4° | 0 mm | 5 | |
| Jan. 15 | Overcast | 17° /7° | 0 mm | 5 | |
| Jan. 16 | Sunny | 19° /6° | 0 mm | 5 | |
| Jan. 17 | Partly cloudy | 13° /5° | 0 mm | 4 | |
| Jan. 18 | Sunny | 18° /5° | 0 mm | 5 | |
| Jan. 19 | Overcast | 18° /7° | 0 mm | 5 | |
| Jan. 20 | Light rain shower | 15° /7° | 2.3 mm | 4 | |
| Jan. 21 | Light rain shower | 12° /6° | 6.1 mm | 3 | |
| Jan. 22 | Light rain shower | 16° /8° | 13.9 mm | 4 | |
| Jan. 23 | Patchy rain possible | 17° /7° | 0 mm | 5 | |
| Jan. 24 | Overcast | 18° /5° | 0 mm | 5 | |
| Jan. 25 | Patchy rain possible | 15° /7° | 0 mm | 4 | |
| Jan. 26 | Sunny | 14° /6° | 10.8 mm | 4 | |
| Jan. 27 | Sunny | 16° /7° | 11.1 mm | 4 | |
| Jan. 28 | Overcast | 16° /7° | 0 mm | 5 | |
| Jan. 29 | Overcast | 17° /6° | 0 mm | 4 | |
| Jan. 30 | Overcast | 17° /9° | 0 mm | 4 | |
| Jan. 31 | Partly cloudy | 18° /7° | 0 mm | 5 | |
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Important Notice
Our weather forecast for Rancho Cucamonga in January 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.
Rancho Cucamonga in January - FAQ
What are the expected maximum and minimum temperatures in Rancho Cucamonga during January?
Enjoy moderate daytime temperatures of up to 16° and cooler nights around 6°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Rancho Cucamonga during January?
In January, Rancho Cucamonga can expect light to moderate rainfall, totaling 49.9 mm across approximately 7 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in Rancho Cucamonga during January?
The average wind speed in Rancho Cucamonga during January is 12 km/h, suggesting breezy to windy conditions, depending on your activities.
January rainfall patterns in Rancho Cucamonga
Explore the daily rainfall trends and prepare for Rancho Cucamongas January weather 💧
UV exposure in Rancho Cucamonga during January
Stay informed about UV levels for safe outdoor activities throughout the month of January ☀️
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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.
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