As of 09:05 CDT

Weather in Ontario, WI

50°

Ontario, Monday, 19 October, 09:05

Clear. Feels like 49°. High 65°, low 43°.

Pressure30.33 inHg

Wind4.1 mph S

Humidity85%

Visibility6.2 mi

Dew point45°

See detailed hourly forecast

Monthly outlook for Ontario, WI: average high 56.2°, average low 37.9°. That is 1.7° above the climate normal for October. Precipitation is expected on 3 days (about 1.4 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 21 October (67.7°), the coolest 28 October (25.2°).

56.2°/37.9°

Average high / low

+1.7°

Above normal

3 / 5

Wet days / normal

1.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
19 October – 28 October	61.5°	54.4°	+4°
29 October – 7 November	47.2°	49.7°	-1.4°
8 November – 17 November	at normal	43.8°	—

October records over 66 years

87.3°3 October 2025All-time high

21.6°30 October 1988All-time low

Climate normals and records are computed from the nearest reference point — Norwalk (8 mi).

Tue, 2068° / 40°

68 °

Ontario, Tuesday, 20 October

Clear. High 68°, low 40°.

Pressure30.36 inHg

Wind6.4 mph S

Humidity53%

Visibility6.2 mi

Dew point44°

Wed, 2168° / 41°

68 °

Ontario, Wednesday, 21 October

Clear. High 68°, low 41°.

Pressure30.24 inHg

Wind5.4 mph SW

Humidity60%

Visibility6.2 mi

Dew point49°

Thu, 2267° / 48°

67 °

Ontario, Thursday, 22 October

Clear. High 67°, low 48°.

Pressure30.33 inHg

Wind5.6 mph SE

Humidity71%

Visibility6.2 mi

Dew point52°

Fri, 2365° / 52°

65 °

Ontario, Friday, 23 October

Partly cloudy. High 65°, low 52°.

Pressure30.30 inHg

Wind11.5 mph SE

Humidity59%

Visibility—

Dew point48°

Sat, 2466° / 53°

66 °

Ontario, Saturday, 24 October

Overcast. High 66°, low 53°.

Pressure30.27 inHg

Wind12.5 mph S

Humidity57%

Visibility—

Dew point45°

Sun, 2562° / 47°

0.04

62 °

Ontario, Sunday, 25 October

Light rain. High 62°, low 47°.

Pressure30.27 inHg

Wind13.9 mph W

Humidity27%

Visibility—

Dew point26°

Mon, 2660° / 41°

0.02

60 °

Ontario, Monday, 26 October

Light rain. High 60°, low 41°.

Pressure30.18 inHg

Wind12 mph S

Humidity35%

Visibility—

Dew point30°

Tue, 2756° / 34°

0.95

56 °

Ontario, Tuesday, 27 October

Rain. High 56°, low 34°.

Pressure30.06 inHg

Wind16.5 mph N

Humidity75%

Visibility—

Dew point37°

Wed, 2839° / 25°

39 °

Ontario, Wednesday, 28 October

Clear. High 39°, low 25°.

Pressure30.30 inHg

Wind15.1 mph NW

Humidity36%

Visibility—

Dew point11°

Thu, 2949° / 26°

49 °

Ontario, Thursday, 29 October

Partly cloudy. High 49°, low 26°.

Pressure30.12 inHg

Wind10.7 mph SW

Humidity32%

Visibility—

Dew point16°

Fri, 3053° / 33°

53 °

Ontario, Friday, 30 October

Mostly clear. High 53°, low 33°.

Pressure29.88 inHg

Wind8.2 mph SW

Humidity48%

Visibility—

Dew point31°

Sat, 3149° / 30°

49 °

Ontario, Saturday, 31 October

Overcast. High 49°, low 30°.

Pressure30.12 inHg

Wind11.5 mph E

Humidity47%

Visibility—

Dew point26°

Sun, 0143° / 36°

0.42

43 °

Ontario, Sunday, 1 November

Snow. High 43°, low 36°.

Pressure29.94 inHg

Wind15.8 mph N

Humidity97%

Visibility—

Dew point42°

Mon, 0244° / 29°

44 °

Ontario, Monday, 2 November

Clear. High 44°, low 29°.

Pressure30.24 inHg

Wind13.5 mph N

Humidity50%

Visibility—

Dew point24°

Tue, 0346° / 28°

46 °

Ontario, Tuesday, 3 November

Overcast. High 46°, low 28°.

Pressure30.06 inHg

Wind6.4 mph NW

Humidity43%

Visibility—

Dew point23°

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

Wed, 0448° / 36°

0.09

48 °

Ontario, Wednesday, 4 November

Climate normal for this date — 60-year average.

Average high48°

Average low36°

Average precipitation0.09 in

Chance of precipitation27%

Record high71° (2008)

Record low4° (1991)

Thu, 0548° / 36°

0.09

48 °

Ontario, Thursday, 5 November

Climate normal for this date — 60-year average.

Average high48°

Average low36°

Average precipitation0.09 in

Chance of precipitation33%

Record high67° (2016)

Record low15° (1991)

Fri, 0648° / 35°

0.06

48 °

Ontario, Friday, 6 November

Climate normal for this date — 60-year average.

Average high48°

Average low35°

Average precipitation0.06 in

Chance of precipitation28%

Record high68° (2020)

Record low6° (1991)

Sat, 0747° / 34°

0.02

47 °

Ontario, Saturday, 7 November

Climate normal for this date — 60-year average.

Average high47°

Average low34°

Average precipitation0.02 in

Chance of precipitation15%

Record high67° (2020)

Record low-9° (1991)

Sun, 0847° / 34°

0.03

47 °

Ontario, Sunday, 8 November

Climate normal for this date — 60-year average.

Average high47°

Average low34°

Average precipitation0.03 in

Chance of precipitation25%

Record high69° (1999)

Record low-4° (1991)

Mon, 0947° / 34°

0.09

47 °

Ontario, Monday, 9 November

Climate normal for this date — 60-year average.

Average high47°

Average low34°

Average precipitation0.09 in

Chance of precipitation37%

Record high70° (1999)

Record low16° (2017)

Tue, 1045° / 33°

0.12

45 °

Ontario, Tuesday, 10 November

Climate normal for this date — 60-year average.

Average high45°

Average low33°

Average precipitation0.12 in

Chance of precipitation33%

Record high67° (2022)

Record low11° (2017)

Wed, 1143° / 31°

0.07

43 °

Ontario, Wednesday, 11 November

Climate normal for this date — 60-year average.

Average high43°

Average low31°

Average precipitation0.07 in

Chance of precipitation27%

Record high67° (1964)

Record low11° (2019)

Thu, 1242° / 30°

0.06

42 °

Ontario, Thursday, 12 November

Climate normal for this date — 60-year average.

Average high42°

Average low30°

Average precipitation0.06 in

Chance of precipitation30%

Record high62° (1964)

Record low4° (2019)

Fri, 1342° / 30°

0.06

42 °

Ontario, Friday, 13 November

Climate normal for this date — 60-year average.

Average high42°

Average low30°

Average precipitation0.06 in

Chance of precipitation22%

Record high67° (1999)

Record low4° (1986)

Sat, 1443° / 31°

0.03

43 °

Ontario, Saturday, 14 November

Climate normal for this date — 60-year average.

Average high43°

Average low31°

Average precipitation0.03 in

Chance of precipitation20%

Record high63° (2025)

Record low15° (2018)

Sun, 1544° / 32°

0.06

44 °

Ontario, Sunday, 15 November

Climate normal for this date — 60-year average.

Average high44°

Average low32°

Average precipitation0.06 in

Chance of precipitation25%

Record high66° (2001)

Record low16° (2014)

Mon, 1644° / 31°

0.07

44 °

Ontario, Monday, 16 November

Climate normal for this date — 60-year average.

Average high44°

Average low31°

Average precipitation0.07 in

Chance of precipitation27%

Record high61° (2023)

Record low16° (2014)

Tue, 1743° / 32°

0.09

43 °

Ontario, Tuesday, 17 November

Climate normal for this date — 60-year average.

Average high43°

Average low32°

Average precipitation0.09 in

Chance of precipitation30%

Record high67° (2016)

Record low8° (2005)

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, WI 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, WI 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.