Rancho Cucamonga (CA) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Rancho Cucamonga.
Climate overview of Rancho Cucamonga
Rancho Cucamonga, California, United States of America, sees big temperature differences between seasons, with August peaking at 34°C (93°F) and December dropping to 18°C (64°F).
With around 318 mm (13 in) of annual rainfall, Rancho Cucamonga has a fairly dry climate. However, it has a distinct dry season from March to November, with very warm summers and pleasant winters. The wettest month is December, while June sees the least rain. The most sunshine falls in July, with an average of 12.3 hours of daily sunshine.
Rancho Cucamonga Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Rancho Cucamonga - and find the best time to visit.
Monthly Temperature in Rancho Cucamonga
Visitors to Rancho Cucamonga can expect significant temperature changes throughout the year. Average daytime temperatures reach a very warm 34°C (93°F) in August. In December, the coolest month of the year, temperatures drop to a pleasant 18°C (64°F).
At night, temperatures range from around 18°C (64°F) in August to 6°C (43°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Rancho Cucamonga
Rancho Cucamonga typically sees modest rainfall throughout the year, with an average annual precipitation of 318 mm (13 in). Rancho Cucamonga can be quite wet during December, receiving approximately 98 mm (3.9 in) of precipitation over 8 rainy days.
In contrast, during the driest month (June), you will experience much drier conditions, with 0.2 mm (0.01 in) of precipitation spread across 0 rainy days. For more details, please visit our Rancho Cucamonga Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Rancho Cucamonga
Rancho Cucamonga can be enjoyed more throughout the sunniest month of July under a blue sky, with approximately 12.3 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 6.6 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Best Time to Visit Rancho Cucamonga
Each month is rated for comfortable sightseeing weather — mild temperatures and low rainfall. Tap a month for its full averages; your ideal time may differ for a beach or winter trip (see below).
- Best overall: January, February, March, April, May, October and November
- Warmest weather: July, August and September
- Most sunshine: July and August
- Fewer rainy days: May, June, July, August and September
- Climate seasons: a distinct dry season from March to November, with very warm summers and pleasant winters
Frequently asked questions about the climate in Rancho Cucamonga
What is the best time to visit Rancho Cucamonga?
January, February, March, April, May, October and November typically offer the most optimal weather in Rancho Cucamonga. In contrast, August tends to have less optimal conditions. Rancho Cucamonga has a distinct dry season from March to November, with very warm summers and pleasant winters.
What temperatures can I expect in Rancho Cucamonga?
Daytime highs range from 18°C (64°F) in December to 34°C (93°F) in August. Nighttime lows range from 6°C (43°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does Rancho Cucamonga get?
Annual rainfall is around 318 mm (13 in). December is the wettest month with 98 mm (3.9 in), while June is the driest with 0.2 mm (0.01 in).
How sunny is Rancho Cucamonga?
Rancho Cucamonga receives around 3,279 hours of sunshine per year. July is the sunniest month with 369 hours, while January is the cloudiest with just 198 hours. Overall, Rancho Cucamonga enjoys abundant sunshine.
Rancho Cucamonga 3-Day Forecast
Rancho Cucamonga (CA) 3-Day Forecast
Rancho Cucamonga on the map
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