As of 11:35 PST

Weather in Ontario, CA

82°

Ontario, Tuesday, 10 November, 11:35

Clear. Feels like 81°. High 83°, low 57°.

Pressure30.09 inHg

Wind4.6 mph E

Humidity30%

Visibility6.2 mi

Dew point48°

See detailed hourly forecast

Monthly outlook for Ontario, CA: average high 67.8°, average low 55.8°. That is 0.8° below the climate normal for November. Precipitation is expected on 5 days (about 0.8 inches), against a normal of 2 days and 0.9 inches. The warmest day looks like 11 November (86.6°), the coolest 19 November (51.4°).

67.8°/55.8°

Average high / low

−0.8°

Below normal

5 / 2

Wet days / normal

0.8 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
10 November – 19 November	70.9°	70.1°	+0.4°
20 November – 29 November	62.8°	66.9°	-2.3°
30 November – 9 December	at normal	64.9°	—

November records over 66 years

94.1°5 November 2020All-time high

28.8°19 November 1964All-time low

Wed, 1187° / 58°

87 °

Ontario, Wednesday, 11 November

Clear. High 87°, low 58°.

Pressure30.03 inHg

Wind1.5 mph SW

Humidity21%

Visibility6.2 mi

Dew point38°

Thu, 1279° / 60°

79 °

Ontario, Thursday, 12 November

Clear. High 79°, low 60°.

Pressure29.88 inHg

Wind2.3 mph SE

Humidity21%

Visibility6.2 mi

Dew point36°

Fri, 1368° / 58°

0.21

68 °

Ontario, Friday, 13 November

Rain. High 68°, low 58°.

Pressure29.83 inHg

Wind6.6 mph W

Humidity73%

Visibility2.2 mi

Dew point54°

Sat, 1465° / 55°

0.22

65 °

Ontario, Saturday, 14 November

Light rain. High 65°, low 55°.

Pressure29.83 inHg

Wind4 mph W

Humidity79%

Visibility—

Dew point54°

Sun, 1567° / 53°

67 °

Ontario, Sunday, 15 November

Clear. High 67°, low 53°.

Pressure30.00 inHg

Wind3.4 mph NE

Humidity68%

Visibility—

Dew point49°

Mon, 1669° / 59°

0.06

69 °

Ontario, Monday, 16 November

Light rain. High 69°, low 59°.

Pressure30.03 inHg

Wind9.1 mph W

Humidity58%

Visibility—

Dew point50°

Tue, 1765° / 58°

0.17

65 °

Ontario, Tuesday, 17 November

Light rain. High 65°, low 58°.

Pressure30.00 inHg

Wind7.7 mph SW

Humidity57%

Visibility—

Dew point46°

Wed, 1865° / 56°

0.09

65 °

Ontario, Wednesday, 18 November

Light rain. High 65°, low 56°.

Pressure30.06 inHg

Wind14.2 mph SW

Humidity45%

Visibility—

Dew point40°

Thu, 1960° / 51°

0.01

60 °

Ontario, Thursday, 19 November

Light rain. High 60°, low 51°.

Pressure29.88 inHg

Wind12.4 mph W

Humidity38%

Visibility—

Dew point31°

Fri, 2062° / 52°

62 °

Ontario, Friday, 20 November

Clear. High 62°, low 52°.

Pressure30.00 inHg

Wind5.6 mph W

Humidity34%

Visibility—

Dew point29°

Sat, 2162° / 54°

0.01

62 °

Ontario, Saturday, 21 November

Light rain. High 62°, low 54°.

Pressure30.06 inHg

Wind9.5 mph SW

Humidity43%

Visibility—

Dew point36°

Sun, 2258° / 55°

0.03

58 °

Ontario, Sunday, 22 November

Light rain. High 58°, low 55°.

Pressure30.09 inHg

Wind7.7 mph NE

Humidity51%

Visibility—

Dew point40°

Mon, 2365° / 52°

65 °

Ontario, Monday, 23 November

Clear. High 65°, low 52°.

Pressure30.21 inHg

Wind4.3 mph NE

Humidity34%

Visibility—

Dew point31°

Tue, 2465° / 56°

65 °

Ontario, Tuesday, 24 November

Overcast. High 65°, low 56°.

Pressure30.06 inHg

Wind4.5 mph W

Humidity22%

Visibility—

Dew point22°

Wed, 2564° / 58°

0.01

64 °

Ontario, Wednesday, 25 November

Light rain. High 64°, low 58°.

Pressure30.12 inHg

Wind6.8 mph SW

Humidity53%

Visibility—

Dew point44°

From day 17 onward the outlook is built from 60-year climate statistics

Thu, 2667° / 45°

0.08

67 °

Ontario, Thursday, 26 November

Climate normal for this date — 60-year average.

Average high67°

Average low45°

Average precipitation0.08 in

Chance of precipitation18%

Record high86° (1977)

Record low31° (2010)

Fri, 2766° / 44°

0.05

66 °

Ontario, Friday, 27 November

Climate normal for this date — 60-year average.

Average high66°

Average low44°

Average precipitation0.05 in

Chance of precipitation18%

Record high86° (2014)

Record low32° (1994)

Sat, 2865° / 43°

0.11

65 °

Ontario, Saturday, 28 November

Climate normal for this date — 60-year average.

Average high65°

Average low43°

Average precipitation0.11 in

Chance of precipitation18%

Record high83° (1980)

Record low32° (1976)

Sun, 2965° / 44°

0.14

65 °

Ontario, Sunday, 29 November

Climate normal for this date — 60-year average.

Average high65°

Average low44°

Average precipitation0.14 in

Chance of precipitation15%

Record high83° (2021)

Record low31° (2010)

Mon, 3065° / 43°

0.08

65 °

Ontario, Monday, 30 November

Climate normal for this date — 60-year average.

Average high65°

Average low43°

Average precipitation0.08 in

Chance of precipitation22%

Record high86° (2021)

Record low30° (2004)

Tue, 0166° / 43°

0.02

66 °

Ontario, Tuesday, 1 December

Climate normal for this date — 60-year average.

Average high66°

Average low43°

Average precipitation0.02 in

Chance of precipitation12%

Record high86° (2021)

Record low29° (2004)

Wed, 0265° / 43°

0.03

65 °

Ontario, Wednesday, 2 December

Climate normal for this date — 60-year average.

Average high65°

Average low43°

Average precipitation0.03 in

Chance of precipitation13%

Record high81° (2017)

Record low31° (2004)

Thu, 0366° / 44°

0.09

66 °

Ontario, Thursday, 3 December

Climate normal for this date — 60-year average.

Average high66°

Average low44°

Average precipitation0.09 in

Chance of precipitation17%

Record high78° (1979)

Record low33° (2004)

Fri, 0465° / 43°

0.1

65 °

Ontario, Friday, 4 December

Climate normal for this date — 60-year average.

Average high65°

Average low43°

Average precipitation0.1 in

Chance of precipitation20%

Record high82° (1979)

Record low31° (2011)

Sat, 0565° / 43°

0.08

65 °

Ontario, Saturday, 5 December

Climate normal for this date — 60-year average.

Average high65°

Average low43°

Average precipitation0.08 in

Chance of precipitation20%

Record high81° (1979)

Record low32° (2011)

Sun, 0665° / 44°

0.11

65 °

Ontario, Sunday, 6 December

Climate normal for this date — 60-year average.

Average high65°

Average low44°

Average precipitation0.11 in

Chance of precipitation18%

Record high81° (1979)

Record low30° (2011)

Mon, 0764° / 44°

0.13

64 °

Ontario, Monday, 7 December

Climate normal for this date — 60-year average.

Average high64°

Average low44°

Average precipitation0.13 in

Chance of precipitation28%

Record high78° (1979)

Record low27° (1978)

Tue, 0864° / 43°

0.04

64 °

Ontario, Tuesday, 8 December

Climate normal for this date — 60-year average.

Average high64°

Average low43°

Average precipitation0.04 in

Chance of precipitation22%

Record high81° (2015)

Record low26° (1978)

Wed, 0964° / 42°

0.03

64 °

Ontario, Wednesday, 9 December

Climate normal for this date — 60-year average.

Average high64°

Average low42°

Average precipitation0.03 in

Chance of precipitation15%

Record high81° (2025)

Record low27° (1978)

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Ontario, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Ontario, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.