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Rancho Cucamonga, CA Weather
Current conditions
Observed at Ontario International Airport · 1 hr ago
Forecast
10-day-
Today
Sunny, with a high near 82. Southwest wind 0 to 10 mph.
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Tonight
Mostly clear, with a low around 60. Northwest wind 0 to 10 mph.
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Wednesday
Rain showers after 11am. Mostly sunny, with a high near 76. South wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
National Weather Service forecast updated 6 hrs ago.
Hourly
Hourly forecast- Now68°
- 10 AM71°
- 11 AM76°
- 12 PM78°
- 1 PM80°
- 2 PM81°
- 3 PM81°
- 4 PM81°
- 5 PM79°
- 6 PM76°
- 7 PM73°
- 8 PM71°
- 9 PM69°
- 10 PM68°
- 11 PM67°
- Wed12 AM66°
- 1 AM64°
- 2 AM64°
- 3 AM62°
- 4 AM62°
- 5 AM62°
- 6 AM61°
- 7 AM61°
- 8 AM63°
Daily forecast
Details- TodayOct 20Sunny60°82°
- WedOct 21Rain Showers94%62°76°
- ThuOct 22Showers And Thunderstorms88%54°67°
- FriOct 23Sunny55°72°
- SatOct 24Sunny57°77°
- SunOct 25Sunny58°78°
- MonOct 26Sunny58°78°
- TueOct 27Cloudy59°82°
- WedOct 28Cloudy61°82°
Days after the National Weather Service's seven are MET Norway's outlook, a computer model with no forecaster's review.
Radar
Full mapWeather news in California
More weather news-
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Pacific Storm Brings Rain and High Elevation Snow to Northern CaliforniaSuaraGarut.ID A Pacific storm moving south along the West Coast is bringing cooler temperatures, breezy winds, and scattered precipitation to Northern California this week According to KCRA meteorologists, rain chances…
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Rain — and potentially lots of it — heading to Southern CaliforniaWidespread rain and possible thunderstorms are headed for Southern California this week, with forecasters on Monday warning that some areas could receive up to 2 inches of rain. The National Weather Service said a…
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Cooler temperatures, possible rain headed for Southern CaliforniaIt’s time to grab those jackets and pull out the umbrellas because cooler temperatures and a chance of rain is on tap for Southern California by the middle of this week, forecasters say. The region could see widespread…
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‘Weather Whiplash’ Bringing Back Rain and Snow to CaliforniaA “weather whiplash” will continue taking Californians for a ride this week, as last week’s high temperatures and blustery winds give way to clouds, rain and snow in the mountains. This week, the stormy weather returns…
- Deep Pacific storm targets Central California, raising rain chances by Wednesday
by Ilya Neyman, Chief Meteorologist Tonight, there is a potent mid-latitude cyclone developing over the North Pacific, just west of Washington state. A very robust jet stream, with winds of close to 200 mph, is…
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Sunday evening Northern California weather forecast - October 18, 2026CBS News Bay Area Evening Edition Weekend 5pm CBS News Detroit Weekend 6:30pm CBS News Miami 6:30pm CBS Philadelphia at 6:30pm What's in Season with Michael Marks CBS News Texas 5:30pm
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California storms could bring much-needed rain and relief to wildfire-weary areas🔥 FIRE RELIEF: Wet weather is headed for California just in time as wildfires rage across the state, bringing much-needed relief to the fiery conditions this week. CALIFORNIA - As numerous wildfires burn across parts of…
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Incoming storm to bring renewed flood risk to California, SouthwestTropical moisture will fuel downpours across California and the Southwest this week, raising the risk of flash flooding and mudslides. Published Oct 18, 2026 11:09 AM EDT | Updated Oct 18, 2026 3:09 PM EDT Dramatic…
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Cooler temperatures settle in Monday across Northern CaliforniaElevated fire weather conditions along with very dry air will continue across the Sierra Nevada and adjacent foothills, including portions of the Sacramento Valley, through tonight due to current weather patterns…
Air quality
Forecast
- TueModerate (55)
NW San Bernardino, CA reporting area. Data from AirNow (EPA and its state, local and tribal partners); preliminary and subject to change.
Sun & moon
Almanac
MonthlyRiverside Area, records since 1893. Normals 1991–2020. Data from NOAA's Regional Climate Centers (ACIS).
Nearby
- Anaheim 42 km
- Riverside 25 km
- Santa Ana 47 km
- Irvine 53 km
- San Bernardino 28 km
- Fontana 15 km
- Moreno Valley 38 km
- Garden Grove 49 km
- Ontario 7 km
- Corona 26 km
- Pomona 16 km
- Pasadena 51 km
Forecasters' discussion
From the National Weather Service office in SGX, issued 4 hrs ago
Synopsis
A low pressure system moving southward off the California coast will spreading cooling inland through Thursday. It is expected to bring showers and slight chance of thunderstorms for late Wednesday through Thursday is it moves inland through California into Nevada. Then warmer and drier for next weekend.
Aviation
201130Z...Coast/Valleys...Areas of intermittent low clouds based around 1200-1800 feet MSL extending into western valleys through 16Z. Low clouds based around 1800-2200 feet MSL to redevelop after 05Z tonight, extending into parts of inland valleys by early Wednesday. Vis reduced 2-5SM inland.
Otherwise...mostly clear and VFR conditions through 18Z. SCT-BKN clouds based around 10 kft develop over inland areas, especially mountains, 19-01Z. Isold SHRA over mountains 21-01Z. Random SCT clouds thereafter.
Marine
A storm system will move through the coastal waters late Wednesday through Thursday. Southerly winds Wednesday and Wednesday night will shift to westerly then northwest Thursday, with isolated and occasional wind gusts exceeding 20 knots. There is a 10-20% chance of TSRA Wednesday night through Thursday. No additional hazardous marine conditions are expected Thursday night through Saturday.
Beaches
Southerly swells will continue to bring surf of 3 to 5 feet with sets to 6 feet, highest at south and southwest-facing beaches today. This will bring hazardous swimming conditions for most. While surf and rip currents will be elevated, daily high tides will not be particularly high, and the threat of coastal flooding is minimal. Details are in the Beach Hazards Statement.
Forecasts, observations and alerts in the United States come from the National Weather Service (NOAA); radar from NOAA's Multi-Radar Multi-Sensor system; satellite imagery from NASA's Global Imagery Browse Services (GIBS) and NOAA's GOES satellites; the map from the U.S. Geological Survey's National Map; air quality from AirNow (EPA and its partners); hurricane information from the National Hurricane Center; climate normals and records from NOAA's Regional Climate Centers (ACIS). Forecasts outside the United States and the UV index: MET Norway (CC BY 4.0); observations outside the U.S.: airport reports via NOAA's Aviation Weather Center. Place names: GeoNames (CC BY 4.0). Data are copied on a schedule and may lag the sources; for warnings that affect your safety, follow your local National Weather Service office and emergency officials. Weather news is drawn from the 4Conservative index and reflects what the press published. Terms of use.