As of 23:51 CDT

Weather in Naperville, IL

66°

Naperville, Saturday, 8 August, 23:51

Clear. Feels like 66°. High 83°, low 66°.

Pressure30.03 inHg

Wind1.3 mph W

Humidity82%

Visibility6.2 mi

Dew point61°

See detailed hourly forecast

Monthly outlook for Naperville, IL: average high 77.5°, average low 62.8°. That is 1.6° below the climate normal for August. Precipitation is expected on 2 days (about 0.7 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 9 August (88.2°), the coolest 21 August (53.7°).

77.5°/62.8°

Average high / low

−1.6°

Below normal

2 / 6

Wet days / normal

0.7 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
8 August – 17 August	79.2°	80.5°	-0.7°
18 August – 27 August	74.5°	80.4°	-3.3°
28 August – 6 September	at normal	78.9°	—

August records over 66 years

98.1°24 August 2023All-time high

44.2°29 August 1986All-time low

Sun, 0988° / 63°

0.29

88 °

Naperville, Sunday, 9 August

Rain. High 88°, low 63°.

Pressure29.94 inHg

Wind12.8 mph S

Humidity75%

Visibility6.2 mi

Dew point74°

Mon, 1088° / 72°

0.38

88 °

Naperville, Monday, 10 August

Heavy rain. High 88°, low 72°.

Pressure29.91 inHg

Wind5.4 mph S

Humidity69%

Visibility6.2 mi

Dew point73°

Tue, 1184° / 70°

0.02

84 °

Naperville, Tuesday, 11 August

Light rain. High 84°, low 70°.

Pressure29.80 inHg

Wind7.2 mph SW

Humidity90%

Visibility6.2 mi

Dew point71°

Wed, 1280° / 67°

0.01

80 °

Naperville, Wednesday, 12 August

Light rain. High 80°, low 67°.

Pressure29.85 inHg

Wind5.4 mph NW

Humidity65%

Visibility6.2 mi

Dew point67°

Thu, 1375° / 63°

75 °

Naperville, Thursday, 13 August

Overcast. High 75°, low 63°.

Pressure30.00 inHg

Wind10.2 mph NE

Humidity56%

Visibility—

Dew point57°

Fri, 1478° / 61°

78 °

Naperville, Friday, 14 August

Clear. High 78°, low 61°.

Pressure30.09 inHg

Wind7.2 mph N

Humidity46%

Visibility—

Dew point53°

Sat, 1566° / 62°

66 °

Naperville, Saturday, 15 August

Light rain. High 66°, low 62°.

Pressure30.30 inHg

Wind4.9 mph SE

Humidity76%

Visibility—

Dew point56°

Sun, 1673° / 63°

73 °

Naperville, Sunday, 16 August

Overcast. High 73°, low 63°.

Pressure30.15 inHg

Wind5.7 mph S

Humidity73%

Visibility—

Dew point59°

Mon, 1777° / 64°

77 °

Naperville, Monday, 17 August

Overcast. High 77°, low 64°.

Pressure30.06 inHg

Wind6.2 mph W

Humidity68%

Visibility—

Dew point64°

Tue, 1881° / 65°

81 °

Naperville, Tuesday, 18 August

Overcast. High 81°, low 65°.

Pressure29.97 inHg

Wind10.7 mph SW

Humidity68%

Visibility—

Dew point66°

Wed, 1974° / 60°

0.02

74 °

Naperville, Wednesday, 19 August

Light rain. High 74°, low 60°.

Pressure29.94 inHg

Wind12.7 mph NW

Humidity76%

Visibility—

Dew point60°

Thu, 2065° / 54°

0.01

65 °

Naperville, Thursday, 20 August

Light rain. High 65°, low 54°.

Pressure30.06 inHg

Wind10.9 mph N

Humidity73%

Visibility—

Dew point53°

Fri, 2176° / 54°

76 °

Naperville, Friday, 21 August

Clear. High 76°, low 54°.

Pressure30.06 inHg

Wind6 mph N

Humidity55%

Visibility—

Dew point54°

Sat, 2271° / 56°

71 °

Naperville, Saturday, 22 August

Overcast. High 71°, low 56°.

Pressure29.91 inHg

Wind10.8 mph S

Humidity79%

Visibility—

Dew point57°

Sun, 2380° / 64°

80 °

Naperville, Sunday, 23 August

Clear. High 80°, low 64°.

Pressure29.91 inHg

Wind11.8 mph W

Humidity51%

Visibility—

Dew point58°

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

Mon, 2481° / 64°

0.13

81 °

Naperville, Monday, 24 August

Climate normal for this date — 60-year average.

Average high81°

Average low64°

Average precipitation0.13 in

Chance of precipitation33%

Record high98° (2023)

Record low52° (1967)

Tue, 2581° / 64°

0.09

81 °

Naperville, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high81°

Average low64°

Average precipitation0.09 in

Chance of precipitation28%

Record high92° (2003)

Record low52° (1977)

Wed, 2681° / 65°

0.19

81 °

Naperville, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0.19 in

Chance of precipitation35%

Record high94° (2024)

Record low50° (1964)

Thu, 2781° / 65°

0.13

81 °

Naperville, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high81°

Average low65°

Average precipitation0.13 in

Chance of precipitation25%

Record high96° (2024)

Record low52° (2025)

Fri, 2880° / 65°

0.11

80 °

Naperville, Friday, 28 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.11 in

Chance of precipitation33%

Record high93° (1984)

Record low47° (1986)

Sat, 2980° / 64°

0.13

80 °

Naperville, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.13 in

Chance of precipitation33%

Record high94° (1984)

Record low44° (1986)

Sun, 3079° / 63°

0.08

79 °

Naperville, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.08 in

Chance of precipitation30%

Record high93° (2013)

Record low49° (1986)

Mon, 3179° / 63°

0.07

79 °

Naperville, Monday, 31 August

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.07 in

Chance of precipitation18%

Record high89° (2012)

Record low50° (2009)

Tue, 0179° / 62°

0.13

79 °

Naperville, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high79°

Average low62°

Average precipitation0.13 in

Chance of precipitation32%

Record high94° (2011)

Record low47° (2009)

Wed, 0279° / 63°

0.05

79 °

Naperville, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.05 in

Chance of precipitation22%

Record high92° (2008)

Record low47° (2017)

Thu, 0379° / 63°

0.09

79 °

Naperville, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.09 in

Chance of precipitation25%

Record high93° (2023)

Record low47° (1974)

Fri, 0478° / 62°

0.1

78 °

Naperville, Friday, 4 September

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.1 in

Chance of precipitation27%

Record high91° (2023)

Record low46° (1974)

Sat, 0578° / 61°

0.07

78 °

Naperville, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high78°

Average low61°

Average precipitation0.07 in

Chance of precipitation22%

Record high89° (1983)

Record low49° (2010)

Sun, 0677° / 61°

0.11

77 °

Naperville, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high77°

Average low61°

Average precipitation0.11 in

Chance of precipitation42%

Record high91° (1990)

Record low46° (1988)

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 Naperville, IL 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 Naperville, IL 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.