10-day forecast for Ontario, CA: 45° to 73°, with precipitation expected on 4 days. The table below breaks each day into morning, afternoon, evening and overnight.
73°
Best day: Sunday, November 15
54° · 1.99 in
Worst day: Thursday, November 19
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1670° / 56°0.09
Morning63°feels 62°
Afternoon70°feels 70°
Evening61°feels 61°
Overnight59°feels 58°
70 °
Ontario, Monday, 16 November
Light rain. High 70°, low 56°.
Pressure30.00 inHg
Wind2.9 mph W
Humidity70%
Visibility6.2 mi
Dew point54°
Tue, 1760° / 48°0.41
Morning54°feels 52°
Afternoon60°feels 58°
Evening50°feels 50°
Overnight53°feels 53°
60 °
Ontario, Tuesday, 17 November
Heavy rain. High 60°, low 48°.
Pressure29.97 inHg
Wind6 mph SW
Humidity56%
Visibility6.2 mi
Dew point44°
Wed, 1861° / 48°0
Morning52°feels 50°
Afternoon60°feels 59°
Evening53°feels 51°
Overnight48°feels 47°
61 °
Ontario, Wednesday, 18 November
Clear. High 61°, low 48°.
Pressure30.12 inHg
Wind1.2 mph S
Humidity58%
Visibility6.2 mi
Dew point45°
Thu, 1954° / 48°1.99
Morning50°feels 50°
Afternoon53°feels 52°
Evening53°feels 53°
Overnight49°feels 49°
54 °
Ontario, Thursday, 19 November
Heavy rain. High 54°, low 48°.
Pressure29.97 inHg
Wind9.8 mph NE
Humidity90%
Visibility—
Dew point49°
Fri, 2058° / 45°0.1
Morning47°feels 47°
Afternoon54°feels 52°
Evening57°feels 55°
Overnight55°feels 53°
58 °
Ontario, Friday, 20 November
Light rain. High 58°, low 45°.
Pressure30.03 inHg
Wind5.3 mph SW
Humidity77%
Visibility—
Dew point45°
Sat, 2168° / 56°0
Morning58°feels 56°
Afternoon64°feels 62°
Evening67°feels 64°
Overnight60°feels 58°
68 °
Ontario, Saturday, 21 November
Clear. High 68°, low 56°.
Pressure30.09 inHg
Wind4 mph W
Humidity31%
Visibility—
Dew point31°
Sun, 2266° / 57°0
Morning59°feels 57°
Afternoon63°feels 61°
Evening65°feels 63°
Overnight60°feels 58°
66 °
Ontario, Sunday, 22 November
Overcast. High 66°, low 57°.
Pressure30.09 inHg
Wind7.9 mph W
Humidity34%
Visibility—
Dew point33°
Mon, 2369° / 58°0
Morning60°feels 58°
Afternoon65°feels 63°
Evening67°feels 65°
Overnight62°feels 60°
69 °
Ontario, Monday, 23 November
Overcast. High 69°, low 58°.
Pressure30.15 inHg
Wind5 mph W
Humidity47%
Visibility—
Dew point43°
Tue, 2472° / 60°0
Morning62°feels 60°
Afternoon68°feels 65°
Evening70°feels 67°
Overnight63°feels 61°
72 °
Ontario, Tuesday, 24 November
Overcast. High 72°, low 60°.
Pressure30.12 inHg
Wind4.9 mph W
Humidity26%
Visibility—
Dew point30°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Ontario, CA around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.