Monthly outlook for Geneva, IL: average high 76.9°, average low 61.6°. That is 1.8° below the climate normal for August. Precipitation is expected on 5 days (about 2.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 9 August (84.7°), the coolest 23 August (52.1°).
76.9°/61.6°
Average high / low
−1.8°
Below normal
5 / 5
Wet days / normal
2.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
77.7°
80.3°
-1.4°
18 August – 27 August
75.6°
80.2°
-2.6°
28 August – 6 September
at normal
78.7°
—
August records over 66 years
98.4°24 August 2023All-time high
44.4°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Aurora (8 mi).
Sun, 0985° / 63°1.43
85 °
Geneva, Sunday, 9 August
Heavy rain. High 85°, low 63°.
Pressure29.94 inHg
Wind8.6 mph E
Humidity96%
Visibility6.1 mi
Dew point66°
Mon, 1083° / 71°0.07
83 °
Geneva, Monday, 10 August
Light rain. High 83°, low 71°.
Pressure29.88 inHg
Wind8.4 mph SE
Humidity73%
Visibility6.2 mi
Dew point72°
Tue, 1181° / 70°0.2
81 °
Geneva, Tuesday, 11 August
Rain. High 81°, low 70°.
Pressure29.80 inHg
Wind7.9 mph W
Humidity88%
Visibility6.2 mi
Dew point72°
Wed, 1280° / 65°0.02
80 °
Geneva, Wednesday, 12 August
Light rain. High 80°, low 65°.
Pressure29.88 inHg
Wind6 mph NW
Humidity86%
Visibility6.2 mi
Dew point69°
Thu, 1372° / 59°0.04
72 °
Geneva, Thursday, 13 August
Light rain. High 72°, low 59°.
Pressure29.94 inHg
Wind13.4 mph E
Humidity72%
Visibility—
Dew point61°
Fri, 1472° / 55°0
72 °
Geneva, Friday, 14 August
Clear. High 72°, low 55°.
Pressure30.18 inHg
Wind8.4 mph NW
Humidity59%
Visibility—
Dew point55°
Sat, 1573° / 54°0
73 °
Geneva, Saturday, 15 August
Overcast. High 73°, low 54°.
Pressure30.33 inHg
Wind5.9 mph S
Humidity63%
Visibility—
Dew point56°
Sun, 1675° / 56°0
75 °
Geneva, Sunday, 16 August
Partly cloudy. High 75°, low 56°.
Pressure30.18 inHg
Wind11.5 mph S
Humidity70%
Visibility—
Dew point60°
Mon, 1776° / 63°0
76 °
Geneva, Monday, 17 August
Overcast. High 76°, low 63°.
Pressure30.00 inHg
Wind6.6 mph S
Humidity87%
Visibility—
Dew point67°
Tue, 1882° / 66°0
82 °
Geneva, Tuesday, 18 August
Overcast. High 82°, low 66°.
Pressure30.00 inHg
Wind8.2 mph N
Humidity64%
Visibility—
Dew point66°
Wed, 1980° / 63°0.3
80 °
Geneva, Wednesday, 19 August
Rain. High 80°, low 63°.
Pressure29.91 inHg
Wind11.1 mph SW
Humidity77%
Visibility—
Dew point70°
Thu, 2075° / 64°0.02
75 °
Geneva, Thursday, 20 August
Light rain. High 75°, low 64°.
Pressure29.91 inHg
Wind10.3 mph N
Humidity78%
Visibility—
Dew point65°
Fri, 2178° / 61°0.02
78 °
Geneva, Friday, 21 August
Light rain. High 78°, low 61°.
Pressure29.97 inHg
Wind7.4 mph NE
Humidity66%
Visibility—
Dew point63°
Sat, 2271° / 56°0.01
71 °
Geneva, Saturday, 22 August
Light rain. High 71°, low 56°.
Pressure29.97 inHg
Wind17.5 mph NE
Humidity86%
Visibility—
Dew point62°
Sun, 2366° / 52°0
66 °
Geneva, Sunday, 23 August
Clear. High 66°, low 52°.
Pressure30.24 inHg
Wind12.5 mph NE
Humidity53%
Visibility—
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2480° / 64°0.13
80 °
Geneva, Monday, 24 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation33%
Record high98° (2023)
Record low53° (1967)
Tue, 2581° / 64°0.09
81 °
Geneva, 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° (2017)
Wed, 2681° / 65°0.18
81 °
Geneva, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.18 in
Chance of precipitation35%
Record high95° (2024)
Record low49° (1964)
Thu, 2781° / 65°0.13
81 °
Geneva, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.13 in
Chance of precipitation27%
Record high96° (2024)
Record low52° (2025)
Fri, 2880° / 65°0.13
80 °
Geneva, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.13 in
Chance of precipitation35%
Record high92° (1984)
Record low47° (1986)
Sat, 2980° / 64°0.14
80 °
Geneva, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.14 in
Chance of precipitation30%
Record high94° (1984)
Record low44° (1965)
Sun, 3079° / 63°0.08
79 °
Geneva, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.08 in
Chance of precipitation28%
Record high93° (2013)
Record low50° (1986)
Mon, 3179° / 63°0.08
79 °
Geneva, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.08 in
Chance of precipitation18%
Record high89° (2012)
Record low50° (2009)
Tue, 0179° / 62°0.13
79 °
Geneva, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.13 in
Chance of precipitation32%
Record high93° (2011)
Record low46° (2009)
Wed, 0279° / 63°0.05
79 °
Geneva, 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° (1965)
Thu, 0379° / 63°0.09
79 °
Geneva, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.09 in
Chance of precipitation28%
Record high93° (2023)
Record low47° (1974)
Fri, 0478° / 62°0.1
78 °
Geneva, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.1 in
Chance of precipitation28%
Record high92° (2023)
Record low46° (1974)
Sat, 0578° / 61°0.07
78 °
Geneva, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.07 in
Chance of precipitation20%
Record high90° (2023)
Record low49° (2010)
Sun, 0677° / 61°0.1
77 °
Geneva, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.1 in
Chance of precipitation38%
Record high91° (1990)
Record low46° (1962)
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 Geneva, 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 Geneva, 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.