Rancho Cucamonga Weather in August

August in Rancho Cucamonga brings very high temperatures around 34°C (93°F) during the day, dropping to 18°C (64°F) at night, with minimal rainfall.

Rainfall in Rancho Cucamonga in August

Historically, the month has about 0 days of rain, averaging 1 mm (0.04 in) in total. If rain does fall, it tends to be very light and barely worth getting out an umbrella for.

Temperature in Rancho Cucamonga in August

Expect highs of 34°C (93°F) in Rancho Cucamonga in August, with nights dropping to around 18°C (64°F). It's usually most comfortable outside during the morning and later in the day. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping. These are average temperatures, but occasional heat spikes are possible. Stay comfortable by wearing light clothing and drinking water.

Sunshine in Rancho Cucamonga in August

With approximately 351 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.

August in Rancho Cucamonga can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.