As of 01:13 CDT

Weather in Ontario, WI

45°

Ontario, Sunday, 18 October, 01:13

Clear. Feels like 38°. High 61°, low 42°.

Pressure30.30 inHg

Wind14 mph SW

Humidity57%

Visibility6.2 mi

Dew point32°

See detailed hourly forecast

Monthly outlook for Ontario, WI: average high 61.7°, average low 44.4°. That is 4.5° above the climate normal for October. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 5 days and 1.4 inches. The warmest day looks like 24 October (70.7°), the coolest 26 October (32.3°).

61.7°/44.4°

Average high / low

+4.5°

Above normal

3 / 5

Wet days / normal

0.4 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
18 October – 27 October	61.3°	54.8°	+3.6°
28 October – 6 November	62.5°	50.2°	+6.8°
7 November – 16 November	at normal	44.3°	—

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).

Mon, 1964° / 44°

64 °

Ontario, Monday, 19 October

Clear. High 64°, low 44°.

Pressure30.36 inHg

Wind2.7 mph S

Humidity65%

Visibility6.2 mi

Dew point47°

Tue, 2064° / 43°

64 °

Ontario, Tuesday, 20 October

Clear. High 64°, low 43°.

Pressure30.39 inHg

Wind7 mph S

Humidity57%

Visibility6.2 mi

Dew point46°

Wed, 2167° / 45°

67 °

Ontario, Wednesday, 21 October

Clear. High 67°, low 45°.

Pressure30.24 inHg

Wind6.2 mph S

Humidity62%

Visibility6.2 mi

Dew point48°

Thu, 2267° / 49°

67 °

Ontario, Thursday, 22 October

Overcast. High 67°, low 49°.

Pressure30.27 inHg

Wind8.3 mph E

Humidity60%

Visibility—

Dew point49°

Fri, 2366° / 51°

66 °

Ontario, Friday, 23 October

Overcast. High 66°, low 51°.

Pressure30.30 inHg

Wind13.1 mph SE

Humidity59%

Visibility—

Dew point48°

Sat, 2471° / 51°

71 °

Ontario, Saturday, 24 October

Overcast. High 71°, low 51°.

Pressure30.00 inHg

Wind19.3 mph S

Humidity46%

Visibility—

Dew point47°

Sun, 2550° / 38°

50 °

Ontario, Sunday, 25 October

Overcast. High 50°, low 38°.

Pressure30.42 inHg

Wind16.7 mph W

Humidity53%

Visibility—

Dew point31°

Mon, 2656° / 32°

56 °

Ontario, Monday, 26 October

Clear. High 56°, low 32°.

Pressure30.36 inHg

Wind11.5 mph SW

Humidity27%

Visibility—

Dew point18°

Tue, 2747° / 36°

0.06

47 °

Ontario, Tuesday, 27 October

Light rain. High 47°, low 36°.

Pressure30.27 inHg

Wind11.6 mph S

Humidity62%

Visibility—

Dew point33°

Wed, 2866° / 47°

66 °

Ontario, Wednesday, 28 October

Light rain. High 66°, low 47°.

Pressure29.88 inHg

Wind20.6 mph SW

Humidity54%

Visibility—

Dew point47°

Thu, 2961° / 51°

0.17

61 °

Ontario, Thursday, 29 October

Light rain. High 61°, low 51°.

Pressure29.59 inHg

Wind19.4 mph W

Humidity81%

Visibility—

Dew point54°

Fri, 3060° / 42°

60 °

Ontario, Friday, 30 October

Clear. High 60°, low 42°.

Pressure29.91 inHg

Wind12.5 mph W

Humidity30%

Visibility—

Dew point25°

Sat, 3161° / 44°

61 °

Ontario, Saturday, 31 October

Light rain. High 61°, low 44°.

Pressure29.97 inHg

Wind16 mph SE

Humidity48%

Visibility—

Dew point39°

Sun, 0160° / 50°

0.12

60 °

Ontario, Sunday, 1 November

Light rain. High 60°, low 50°.

Pressure29.77 inHg

Wind20 mph W

Humidity35%

Visibility—

Dew point30°

Mon, 0266° / 46°

66 °

Ontario, Monday, 2 November

Clear. High 66°, low 46°.

Pressure29.97 inHg

Wind16.3 mph S

Humidity37%

Visibility—

Dew point36°

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

Tue, 0349° / 36°

0.06

49 °

Ontario, Tuesday, 3 November

Climate normal for this date — 60-year average.

Average high49°

Average low36°

Average precipitation0.06 in

Chance of precipitation25%

Record high70° (2008)

Record low12° (1991)

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)

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.