Rancho Cucamonga, CA Weather Forecast
Right now it is 73°F and clear in Rancho Cucamonga (as of Fri, 9:50 PM PST). Tomorrow: sunny, high near 82°F. Official NWS forecast and alerts, refreshed every 30 minutes.
Current conditions
Measured at Ontario International Airport (4 mi from the city center).
Weather tomorrow in Rancho Cucamonga
Sunny82°FSunny, with a high near 82. Northwest wind 0 to 10 mph.
Mostly Clear59°FMostly clear, with a low around 59. Northwest wind 0 to 5 mph.
Weather alerts
No active National Weather Service watches, warnings or advisories for Rancho Cucamonga right now.
7-day forecast
Mostly Clear59°FTonight: Mostly clear, with a low around 59. Northeast wind around 15 mph, with gusts as high as 30 mph.
Sunny82°F / 59°FSunny, with a high near 82. Northwest wind 0 to 10 mph. Saturday Night: Mostly clear, with a low around 59. Northwest wind 0 to 5 mph.
Sunny84°F / 61°FSunny, with a high near 84. Northeast wind 0 to 5 mph. Sunday Night: Mostly clear, with a low around 61. North wind 0 to 10 mph, with gusts as high as 20 mph.
Sunny83°F / 61°FSunny, with a high near 83. Monday Night: Mostly clear, with a low around 61.
Sunny82°F / 59°FSunny, with a high near 82. Tuesday Night: Mostly clear, with a low around 59.
Sunny83°F / 60°FSunny, with a high near 83. Wednesday Night: Clear, with a low around 60.
Sunny
12% chance of rain/snow79°F / 58°FSunny, with a high near 79. Thursday Night: Partly cloudy, with a low around 58.
Mostly Sunny then Slight Chance Rain Showers 19% chance of rain/snow75°FA slight chance of rain showers after 4pm. Mostly sunny, with a high near 75.
Forecast issued by NWS forecast office SGX · updated Nov 6, 10:29 AM PST. Daytime highs and overnight lows are on the right.
Hourly forecast, radar & more on weather.gov
Nearby cities
Rancho Cucamonga population: 177,856 (U.S. Census Bureau, July 1, 2025 estimate). More California cities · All US cities
Source: National Weather Service / NOAA (public domain), fetched live. Tachlis is not affiliated with the NWS.
Questions & answers
What is the weather tomorrow in Rancho Cucamonga?
Saturday, November 7: Sunny, high near 82°F; night: mostly clear, low around 59°F.
Where does the Rancho Cucamonga forecast come from?
From the National Weather Service forecast office SGX, which writes the official forecast for Rancho Cucamonga's 2.5 km grid square. Current conditions come from the nearest NWS/FAA weather station.
How often is the Rancho Cucamonga weather updated?
This page fetches fresh data from the National Weather Service at most every 30 minutes, and checks for new watches and warnings every 5 minutes.
What time zone are the times shown in?
Local time for Rancho Cucamonga (America/Los Angeles).
Why can the current temperature differ from the forecast?
The current reading is a real measurement at a weather station, often at an airport, while the forecast describes the whole grid square around the city. Temperatures can differ by a few degrees across a city.