Ontario, CA weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Ontario now
Loading the National Weather Service forecast…
Ontario weather by the hour
Ontario weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Ontario.
This week in Ontario
Sunrise, sunset and moon in Ontario
What is the weather usually like in Ontario?
Köppen climate classification, calculated from the 1991–2020 normals
- Augustwarmest month · 95°F average high
- Decembercoldest month · 43°F average low
- 11.6 inprecipitation per year · 296 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Ontario: April–May and October–November, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station ONTARIO INTL AP, CA US (USW00003102), adjusted for the elevation of Ontario.
Ontario weather month by month
Sunrise and sunset in Ontario through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:54 AM | 5:05 PM | 10 h 11 min |
| February | 6:33 AM | 5:35 PM | 11 h 2 min |
| March | 6:59 AM | 6:59 PM | 12 h 0 min |
| April | 6:17 AM | 7:23 PM | 13 h 5 min |
| May | 5:47 AM | 7:46 PM | 13 h 59 min |
| June | 5:37 AM | 8:04 PM | 14 h 27 min |
| July | 5:49 AM | 8:03 PM | 14 h 14 min |
| August | 6:10 AM | 7:38 PM | 13 h 27 min |
| September | 6:32 AM | 6:58 PM | 12 h 25 min |
| October | 6:54 AM | 6:17 PM | 11 h 23 min |
| November | 6:21 AM | 4:48 PM | 10 h 26 min |
| December | 6:47 AM | 4:44 PM | 9 h 56 min |
Times for the 15th of each month, local time (America/Los Angeles).
What is the weather like in Ontario?
Ontario has a hot semi-arid climate. The warmest month is August, with an average high of 95°F (35°C), and the coldest is December, with average lows of 43°F (6°C).
It gets about 11.6 inches (296 mm) of precipitation a year. The wettest month is February and the driest is June.
The best time to visit Ontario is April–May and October–November. At 1,004 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Ontario
Weather in towns near Ontario
Questions about the weather in Ontario
What is the hottest month in Ontario?
August, with an average high of 95°F (35°C).
What is the coldest month in Ontario?
December, with an average low of 43°F (6°C).
How much does it rain in Ontario?
About 11.6 inches (296 mm) a year; the wettest month is February.
Does it snow in Ontario?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Ontario?
April–May and October–November, when temperatures are most pleasant and rainy days are fewer.
What climate does Ontario have?
Hot semi-arid (Köppen BSh).
What is the weather like in Ontario in November?
Highs average 74°F and lows 49°F, with about 0.8 inches of precipitation.
What time is sunrise in Ontario?
Around 6:21 AM in mid-November, and sunset around 4:48 PM. Today’s exact times are shown above.
Where does this Ontario weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Ontario.
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