As of 04:34 CDT

Weather in Savanna, IL

59°

Savanna, Sunday, 9 August, 04:34

Mostly clear. Feels like 58°. High 84°, low 59°.

Pressure29.97 inHg

Wind5.1 mph SE

Humidity91%

Visibility6.2 mi

Dew point56°

See detailed hourly forecast

Monthly outlook for Savanna, IL: average high 83.6°, average low 66.4°. That is 1.8° above the climate normal for August. Precipitation is expected on 5 days (about 1.0 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 22 August (94.2°), the coolest 15 August (57.8°).

83.6°/66.4°

Average high / low

+1.8°

Above normal

5 / 5

Wet days / normal

1.0 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	80.2°	80.4°	-0.1°
19 August – 28 August	89.1°	80.4°	+4.8°
29 August – 7 September	at normal	78.6°	—

August records over 66 years

102.2°16 August 1988All-time high

45.1°29 August 1986All-time low

Climate normals and records are computed from the nearest reference point — Goose Lake (15 mi).

Mon, 1088° / 71°

0.14

88 °

Savanna, Monday, 10 August

Rain. High 88°, low 71°.

Pressure29.91 inHg

Wind3.8 mph E

Humidity88%

Visibility6.2 mi

Dew point74°

Tue, 1186° / 70°

0.04

86 °

Savanna, Tuesday, 11 August

Light rain. High 86°, low 70°.

Pressure29.77 inHg

Wind11 mph SW

Humidity84%

Visibility6.2 mi

Dew point71°

Wed, 1282° / 68°

82 °

Savanna, Wednesday, 12 August

Overcast. High 82°, low 68°.

Pressure29.85 inHg

Wind6.8 mph N

Humidity73%

Visibility6.2 mi

Dew point72°

Thu, 1374° / 62°

0.24

74 °

Savanna, Thursday, 13 August

Rain. High 74°, low 62°.

Pressure30.03 inHg

Wind8.7 mph E

Humidity66%

Visibility—

Dew point60°

Fri, 1474° / 59°

0.02

74 °

Savanna, Friday, 14 August

Light rain. High 74°, low 59°.

Pressure30.15 inHg

Wind10.1 mph E

Humidity60%

Visibility—

Dew point56°

Sat, 1575° / 58°

0.04

75 °

Savanna, Saturday, 15 August

Light rain. High 75°, low 58°.

Pressure30.21 inHg

Wind10.9 mph SE

Humidity64%

Visibility—

Dew point59°

Sun, 1677° / 65°

0.02

77 °

Savanna, Sunday, 16 August

Light rain. High 77°, low 65°.

Pressure30.09 inHg

Wind5.7 mph NW

Humidity87%

Visibility—

Dew point67°

Mon, 1781° / 64°

81 °

Savanna, Monday, 17 August

Overcast. High 81°, low 64°.

Pressure30.09 inHg

Wind5.7 mph NE

Humidity65%

Visibility—

Dew point64°

Tue, 1881° / 62°

81 °

Savanna, Tuesday, 18 August

Overcast. High 81°, low 62°.

Pressure29.97 inHg

Wind10.4 mph S

Humidity80%

Visibility—

Dew point67°

Wed, 1990° / 70°

90 °

Savanna, Wednesday, 19 August

Overcast. High 90°, low 70°.

Pressure29.83 inHg

Wind13 mph SE

Humidity70%

Visibility—

Dew point72°

Thu, 2093° / 77°

93 °

Savanna, Thursday, 20 August

Overcast. High 93°, low 77°.

Pressure29.77 inHg

Wind7.3 mph N

Humidity58%

Visibility—

Dew point72°

Fri, 2186° / 71°

86 °

Savanna, Friday, 21 August

Partly cloudy. High 86°, low 71°.

Pressure29.94 inHg

Wind11.2 mph NE

Humidity56%

Visibility—

Dew point66°

Sat, 2294° / 67°

94 °

Savanna, Saturday, 22 August

Clear. High 94°, low 67°.

Pressure29.83 inHg

Wind12.2 mph SE

Humidity67%

Visibility—

Dew point71°

Sun, 2389° / 74°

0.01

89 °

Savanna, Sunday, 23 August

Light rain. High 89°, low 74°.

Pressure29.80 inHg

Wind15.5 mph NE

Humidity52%

Visibility—

Dew point67°

Mon, 2482° / 65°

0.15

82 °

Savanna, Monday, 24 August

Light rain. High 82°, low 65°.

Pressure30.03 inHg

Wind14 mph E

Humidity73%

Visibility—

Dew point69°

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

Tue, 2581° / 64°

0.13

81 °

Savanna, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high81°

Average low64°

Average precipitation0.13 in

Chance of precipitation30%

Record high93° (2003)

Record low52° (2025)

Wed, 2681° / 64°

0.17

81 °

Savanna, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high81°

Average low64°

Average precipitation0.17 in

Chance of precipitation30%

Record high94° (2003)

Record low50° (1964)

Thu, 2780° / 65°

0.11

80 °

Savanna, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high80°

Average low65°

Average precipitation0.11 in

Chance of precipitation27%

Record high95° (2024)

Record low52° (1968)

Fri, 2880° / 64°

0.19

80 °

Savanna, Friday, 28 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.19 in

Chance of precipitation37%

Record high93° (1984)

Record low46° (1986)

Sat, 2980° / 64°

0.12

80 °

Savanna, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high80°

Average low64°

Average precipitation0.12 in

Chance of precipitation27%

Record high93° (1984)

Record low45° (1986)

Sun, 3079° / 63°

0.07

79 °

Savanna, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.07 in

Chance of precipitation25%

Record high94° (2013)

Record low53° (2009)

Mon, 3179° / 62°

0.07

79 °

Savanna, Monday, 31 August

Climate normal for this date — 60-year average.

Average high79°

Average low62°

Average precipitation0.07 in

Chance of precipitation23%

Record high93° (2000)

Record low47° (2009)

Tue, 0179° / 62°

0.12

79 °

Savanna, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high79°

Average low62°

Average precipitation0.12 in

Chance of precipitation27%

Record high94° (1984)

Record low47° (1967)

Wed, 0279° / 62°

0.07

79 °

Savanna, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high79°

Average low62°

Average precipitation0.07 in

Chance of precipitation27%

Record high92° (1960)

Record low47° (1967)

Thu, 0378° / 62°

0.13

78 °

Savanna, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.13 in

Chance of precipitation32%

Record high93° (2023)

Record low48° (1974)

Fri, 0478° / 61°

0.09

78 °

Savanna, Friday, 4 September

Climate normal for this date — 60-year average.

Average high78°

Average low61°

Average precipitation0.09 in

Chance of precipitation30%

Record high92° (2023)

Record low46° (2025)

Sat, 0578° / 60°

0.09

78 °

Savanna, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high78°

Average low60°

Average precipitation0.09 in

Chance of precipitation18%

Record high91° (2023)

Record low48° (1974)

Sun, 0678° / 60°

0.08

78 °

Savanna, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high78°

Average low60°

Average precipitation0.08 in

Chance of precipitation30%

Record high92° (1960)

Record low45° (1962)

Mon, 0778° / 60°

0.11

78 °

Savanna, Monday, 7 September

Climate normal for this date — 60-year average.

Average high78°

Average low60°

Average precipitation0.11 in

Chance of precipitation27%

Record high92° (1960)

Record low45° (2025)

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 Savanna, 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 Savanna, 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.