Ontario, California Weather Forecast
Today in Ontario: mostly sunny with a high near 70°F and a low around 57°F. Rain chance 18%. No day tops a 20% rain chance through Thursday. Warming trend: highs climb from 70°F today to 80°F by Monday.
Forecast updated 1:05 AM PDT, Oct 23
Active Weather Alerts
7-Day Forecast for Ontario
Today 10/23
18%
70°57°
Sat 10/24
76°55°
Sun 10/25
78°57°
Mon 10/26
80°58°
Tue 10/27
78°57°
Wed 10/28
75°57°
Thu 10/29
71°57°
Next 24 Hours
| Now | 8 AM | 9 AM | 10 AM | 11 AM | 12 PM | 1 PM | 2 PM | 3 PM | 4 PM | 5 PM | 6 PM | 7 PM | 8 PM | 9 PM | 10 PM | 11 PM | Sat12 AM | 1 AM | 2 AM | 3 AM | 4 AM | 5 AM | 6 AM | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sky |  | | | | | | | | |  | | | |  | |  | | | | | | | | |
| Temp | 57° | 58° | 59° | 61° | 63° | 65° | 66° | 68° | 70° | 70° | 68° | 66° | 65° | 63° | 62° | 61° | 60° | 59° | 58° | 57° | 57° | 56° | 56° | 56° |
| Rain | 2% | 2% | 1% | 1% | 1% | 1% | 2% | 8% | 14% | 18% | 17% | 16% | 6% | 5% | 4% | 3% | 2% | 1% | 1% | 1% | 1% | 1% | 1% | 1% |
| Wind | ENE 3 | ENE 3 | E 3 | E 2 | SE 2 | SSW 1 | SW 2 | SW 3 | WSW 3 | W 5 | W 5 | WSW 3 | WSW 0 | WSW 2 | WSW 1 | W 2 | NW 2 | W 3 | NE 3 | NW 3 | NNW 3 | N 2 | N 2 | NW 3 |
Growing Conditions
Growing degree days
4,733
since Apr 1, base 50°F
Rain, last 30 days
2.92 in
model analysis
Rain, year to date
12.61 in
since Jan 1
2-inch soil temperature
67°F
yesterday, daily average
Reference ET, last 7 days
1.35 in
FAO-56 grass reference
Through Oct 22. Season totals use model analysis for this point and update every morning.
Soil, ET and spray tools for Ontario →
Current Stats & Observations
NWS Forecast
About Ontario Weather
Ontario sits at about 860 feet above sea level in San Bernardino County, California. About 185,010 people live in the Ontario area. Official forecasts and warnings for the area come from the National Weather Service SGX office, and the nearest NEXRAD radar site is KSOX. The city is in USDA plant hardiness zone 10a, where the coldest winter night typically falls between 30 to 35°F. Freezing temperatures are rare here.
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