5-day weather forecast for Rancho Cucamonga, California
Today
56°
77°
Mostly cloudy
Friday
55°
62°
Mostly cloudy
Saturday
49°
64°
Mostly cloudy
Sunday
52°
78°
Sunny
Monday
55°
82°
Sunny
Click on a forecast to see the forecast trend for that day
Weather changeability for Ontario, California
| Temperature | Last Month | Last Year |
|---|---|---|
| Average change in high temperature day-to-day | 7.9° | 4.7° |
| Average change in low temperature day-to-day | 3.9° | 3.9° |
| Precipitation | Last Month | Last Year |
|---|---|---|
| Chance of dry day after a precip day | 40% | 57% |
| Chance of precip day after a dry day | 8% | 6% |
Weather forecast accuracy for Ontario, California
| National Weather Service | 82.47% |
| NWS Digital Forecast | 82.41% |
| Weather Underground | 81.90% |
| The Weather Channel | 77.59% |
| Intellicast | 77.59% |
| AccuWeather | 74.43% |
| CustomWeather | 71.55% |
| World Weather Online | 67.24% |
| Persistence | 55.46% |
| The Weather Channel | 82.21% |
| Intellicast | 82.09% |
| National Weather Service | 80.95% |
| NWS Digital Forecast | 80.47% |
| AccuWeather | 78.63% |
| CustomWeather | 76.68% |
| Persistence | 63.47% |
ForecastAdvisor Fact
2.9% of AccuWeather's high temperature forecasts for Ontario were off by more than 10 degrees last year.