As of 17:44 PST

Weather in Ontario, CA

71°

Ontario, Thursday, 5 November, 17:44

Mostly clear. Feels like 70°. High 77°, low 54°.

Pressure29.94 inHg

Wind6.9 mph W

Humidity43%

Visibility6.2 mi

Dew point48°

See detailed hourly forecast

Monthly outlook for Ontario, CA: average high 75.7°, average low 60.2°. That is 2.8° above the climate normal for November. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 2 days and 0.8 inches. The warmest day looks like 6 November (82.2°), the coolest 5 November (54.3°).

75.7°/60.2°

Average high / low

+2.8°

Above normal

1 / 2

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
5 November – 14 November	79.3°	71.5°	+4.3°
15 November – 24 November	69.7°	68.5°	+0.7°
25 November – 4 December	at normal	65.8°	—

November records over 66 years

94.1°5 November 2020All-time high

28.8°19 November 1964All-time low

Fri, 0682° / 55°

82 °

Ontario, Friday, 6 November

Clear. High 82°, low 55°.

Pressure30.00 inHg

Wind2.8 mph SE

Humidity24%

Visibility6.2 mi

Dew point37°

Sat, 0778° / 55°

78 °

Ontario, Saturday, 7 November

Clear. High 78°, low 55°.

Pressure30.00 inHg

Wind3 mph SW

Humidity31%

Visibility6.2 mi

Dew point43°

Sun, 0881° / 58°

81 °

Ontario, Sunday, 8 November

Mostly clear. High 81°, low 58°.

Pressure30.03 inHg

Wind2 mph SE

Humidity22%

Visibility6.2 mi

Dew point38°

Mon, 0981° / 63°

81 °

Ontario, Monday, 9 November

Clear. High 81°, low 63°.

Pressure30.00 inHg

Wind0.9 mph N

Humidity23%

Visibility6.2 mi

Dew point38°

Tue, 1081° / 63°

81 °

Ontario, Tuesday, 10 November

Clear. High 81°, low 63°.

Pressure30.09 inHg

Wind2.7 mph NE

Humidity31%

Visibility—

Dew point40°

Wed, 1181° / 60°

81 °

Ontario, Wednesday, 11 November

Clear. High 81°, low 60°.

Pressure30.09 inHg

Wind8.3 mph W

Humidity25%

Visibility—

Dew point35°

Thu, 1278° / 68°

78 °

Ontario, Thursday, 12 November

Clear. High 78°, low 68°.

Pressure30.00 inHg

Wind9.4 mph W

Humidity26%

Visibility—

Dew point37°

Fri, 1377° / 66°

77 °

Ontario, Friday, 13 November

Overcast. High 77°, low 66°.

Pressure29.94 inHg

Wind8.2 mph W

Humidity44%

Visibility—

Dew point48°

Sat, 1475° / 66°

75 °

Ontario, Saturday, 14 November

Mostly clear. High 75°, low 66°.

Pressure29.97 inHg

Wind9 mph SW

Humidity47%

Visibility—

Dew point49°

Sun, 1574° / 63°

74 °

Ontario, Sunday, 15 November

Partly cloudy. High 74°, low 63°.

Pressure30.03 inHg

Wind6.3 mph W

Humidity48%

Visibility—

Dew point48°

Mon, 1665° / 58°

0.13

65 °

Ontario, Monday, 16 November

Light rain. High 65°, low 58°.

Pressure30.00 inHg

Wind13.6 mph SW

Humidity62%

Visibility—

Dew point51°

Tue, 1765° / 57°

65 °

Ontario, Tuesday, 17 November

Partly cloudy. High 65°, low 57°.

Pressure30.12 inHg

Wind5.4 mph W

Humidity42%

Visibility—

Dew point38°

Wed, 1867° / 59°

67 °

Ontario, Wednesday, 18 November

Overcast. High 67°, low 59°.

Pressure30.12 inHg

Wind5.8 mph W

Humidity27%

Visibility—

Dew point28°

Thu, 1972° / 58°

72 °

Ontario, Thursday, 19 November

Clear. High 72°, low 58°.

Pressure30.12 inHg

Wind8.1 mph NE

Humidity23%

Visibility—

Dew point27°

Fri, 2076° / 60°

76 °

Ontario, Friday, 20 November

Clear. High 76°, low 60°.

Pressure30.15 inHg

Wind4 mph NE

Humidity16%

Visibility—

Dew point20°

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

Sat, 2167° / 46°

0.12

67 °

Ontario, Saturday, 21 November

Climate normal for this date — 60-year average.

Average high67°

Average low46°

Average precipitation0.12 in

Chance of precipitation23%

Record high90° (2017)

Record low31° (1979)

Sun, 2267° / 46°

0.07

67 °

Ontario, Sunday, 22 November

Climate normal for this date — 60-year average.

Average high67°

Average low46°

Average precipitation0.07 in

Chance of precipitation15%

Record high93° (2017)

Record low31° (1979)

Mon, 2368° / 45°

0.01

68 °

Ontario, Monday, 23 November

Climate normal for this date — 60-year average.

Average high68°

Average low45°

Average precipitation0.01 in

Chance of precipitation8%

Record high92° (2017)

Record low34° (2003)

Tue, 2468° / 45°

0.04

68 °

Ontario, Tuesday, 24 November

Climate normal for this date — 60-year average.

Average high68°

Average low45°

Average precipitation0.04 in

Chance of precipitation15%

Record high88° (2017)

Record low35° (1972)

Wed, 2567° / 44°

0.07

67 °

Ontario, Wednesday, 25 November

Climate normal for this date — 60-year average.

Average high67°

Average low44°

Average precipitation0.07 in

Chance of precipitation15%

Record high88° (2017)

Record low30° (1973)

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)

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.