Weather forecast for 10 daysRancho Cucamonga, CA
Weather forecast for the weekend
Sunday Oct 18, 2026
- 86°F
- 64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphSW 223°
- Humidity: 25%
- UV index: 6
- Sunrise: 6:58 am PDT
- Sunset: 6:12 pm PDT
- details ▼
On Sunday, in Rancho Cucamonga, expect sunny weather with a crisp, clear sky.
Temperature fluctuations between a humid 86°F and a comfortable 64.4°F are anticipated.
Today, the anticipated high will be higher and much closer to September's average high of 88.3°F than October's 79.2°F.
Sunrise will be at 6:58 am and sunset at 6:12 pm; the daylight will last for 11h and 14min.
Temperature fluctuations between a humid 86°F and a comfortable 64.4°F are anticipated.
Today, the anticipated high will be higher and much closer to September's average high of 88.3°F than October's 79.2°F.
Sunrise will be at 6:58 am and sunset at 6:12 pm; the daylight will last for 11h and 14min.
10-day overview
Daily temperatures
Warmest period: today - tomorrow 86°C.
Coldest day: Thursday 66°C.
Coldest day: Thursday 66°C.
Chance of precipitation
Highest chance: Wednesday 65%.
Long-term weather forecast
- Sunday
- Oct 18, 2026
- 86°F
- 64°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 10mphSW 223°
- Humidity: 25%
- UV index: 6
- Sunrise: 6:58 am PDT
- Sunset: 6:12 pm PDT
- details ▼
- Monday
- Oct 19, 2026
- 86°F
- 63°F
Sunny
- Precip. probability: 0%
- Precipitation: 0"
- Wind: 12mphSW 216°
- Humidity: 31%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:11 pm PDT
- details ▼
- Tuesday
- Oct 20, 2026
- 82°F
- 61°F
Sunny
- Precip. probability: 2%
- Precipitation: 0"
- Wind: 11mphSSW 197°
- Humidity: 42%
- UV index: 6
- Sunrise: 6:59 am PDT
- Sunset: 6:10 pm PDT
- details ▼
- Wednesday
- Oct 21, 2026
- 77°F
- 59°F
Rain
- Precip. probability: 65%
- Precipitation: 0"
- Wind: 12mphS 191°
- Humidity: 58%
- UV index: 6
- Sunrise: 7:00 am PDT
- Sunset: 6:09 pm PDT
- details ▼
- Thursday
- Oct 22, 2026
- 66°F
- 55°F
Scattered Thunderstorms
- Precip. probability: 63%
- Precipitation: 0.55"
- Wind: 9mphSW 215°
- Humidity: 72%
- UV index: 5
- Sunrise: 7:01 am PDT
- Sunset: 6:07 pm PDT
- details ▼
- Friday
- Oct 23, 2026
- 72°F
- 57°F
Sunny
- Precip. probability: 5%
- Precipitation: 0.16"
- Wind: 8mphWNW 282°
- Humidity: 59%
- UV index: 5
- Sunrise: 7:02 am PDT
- Sunset: 6:06 pm PDT
- details ▼
- Saturday
- Oct 24, 2026
- 79°F
- 59°F
Sunny
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 8mphN 353°
- Humidity: 40%
- UV index: 5
- Sunrise: 7:03 am PDT
- Sunset: 6:05 pm PDT
- details ▼
- Sunday
- Oct 25, 2026
- 77°F
- 57°F
Partly Cloudy
- Precip. probability: 4%
- Precipitation: 0"
- Wind: 10mphW 265°
- Humidity: 43%
- UV index: 5
- Sunrise: 7:04 am PDT
- Sunset: 6:04 pm PDT
- details ▼
- Monday
- Oct 26, 2026
- 73°F
- 55°F
Mostly Sunny
- Precip. probability: 14%
- Precipitation: 0"
- Wind: 10mphWSW 251°
- Humidity: 49%
- UV index: 5
- Sunrise: 7:05 am PDT
- Sunset: 6:03 pm PDT
- details ▼
- Tuesday
- Oct 27, 2026
- 72°F
- 55°F
Partly Cloudy
- Precip. probability: 1%
- Precipitation: 0"
- Wind: 9mphWSW 257°
- Humidity: 49%
- UV index: 5
- Sunrise: 7:05 am PDT
- Sunset: 6:02 pm PDT
- details ▼
The next ten days will bring unstable conditions, and a mix of bright, dull, showery and turbulent weather is anticipated.
With a 63% probability, rainfall is expected only on Thursday. The precipitation will be moderate at 0.55".
Temperature fluctuation will be noticeable in the next ten days. The maximum temperature will vary between 66.2°F and 86°F, while the minimum temperature is forecast to range between 55.4°F and 64.4°F.
Sunday and Monday, with the highest temperature of 86°F, will be the hottest days in Rancho Cucamonga; with the highest temperature of 66.2°F, Thursday will be the coldest day.
With a 63% probability, rainfall is expected only on Thursday. The precipitation will be moderate at 0.55".
Temperature fluctuation will be noticeable in the next ten days. The maximum temperature will vary between 66.2°F and 86°F, while the minimum temperature is forecast to range between 55.4°F and 64.4°F.
Sunday and Monday, with the highest temperature of 86°F, will be the hottest days in Rancho Cucamonga; with the highest temperature of 66.2°F, Thursday will be the coldest day.
Updated: Oct 18, 2026 @ 09:51:53 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate
Frequently asked questions
On Sunday, clear skies and sunshine are anticipated.
Today, the maximum temperature will be 86°F, while the minimum temperature will be 64.4°F.
Today, the maximum temperature will be a couple of degrees higher than the average highest temperature in October. Today, the lowest temperature will be also slightly warmer than the average low temperature.
Today, the maximum temperature will be a couple of degrees higher than the average highest temperature in October. Today, the lowest temperature will be also slightly warmer than the average low temperature.
On Sunday, in Rancho Cucamonga, sunrise will be at 6:58 am and sunset at 6:12 pm (PDT).
In Rancho Cucamonga, the length of the day today will be 11h and 14min.
