Monthly outlook for Galesburg, IA: average high 86.2°, average low 68.5°. That is 3° above the climate normal for August. Precipitation is expected on 4 days (about 2.4 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 22 August (103.5°), the coolest 15 August (61.2°).
86.2°/68.5°
Average high / low
+3°
Above normal
4 / 5
Wet days / normal
2.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
82.2°
80.7°
+0.8°
19 August – 28 August
92.8°
80.9°
+6.6°
29 August – 7 September
at normal
79.2°
—
August records over 66 years
100.2°16 August 1988All-time high
43.9°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Newton (11 mi).
Mon, 1087° / 73°0
87 °
Galesburg, Monday, 10 August
Light rain. High 87°, low 73°.
Pressure29.85 inHg
Wind11.1 mph E
Humidity74%
Visibility6.2 mi
Dew point74°
Tue, 1192° / 72°0.02
92 °
Galesburg, Tuesday, 11 August
Light rain. High 92°, low 72°.
Pressure29.77 inHg
Wind9.9 mph SW
Humidity58%
Visibility6.2 mi
Dew point69°
Wed, 1285° / 70°0.41
85 °
Galesburg, Wednesday, 12 August
Rain. High 85°, low 70°.
Pressure29.85 inHg
Wind3.5 mph E
Humidity70%
Visibility6.2 mi
Dew point68°
Thu, 1373° / 62°0.17
73 °
Galesburg, Thursday, 13 August
Rain. High 73°, low 62°.
Pressure29.97 inHg
Wind15.9 mph NE
Humidity71%
Visibility—
Dew point62°
Fri, 1467° / 62°1.61
67 °
Galesburg, Friday, 14 August
Heavy rain. High 67°, low 62°.
Pressure30.12 inHg
Wind12.5 mph E
Humidity92%
Visibility—
Dew point62°
Sat, 1571° / 61°0.04
71 °
Galesburg, Saturday, 15 August
Light rain. High 71°, low 61°.
Pressure30.15 inHg
Wind12.5 mph E
Humidity87%
Visibility—
Dew point64°
Sun, 1680° / 66°0
80 °
Galesburg, Sunday, 16 August
Overcast. High 80°, low 66°.
Pressure30.12 inHg
Wind7.7 mph N
Humidity68%
Visibility—
Dew point66°
Mon, 1783° / 66°0
83 °
Galesburg, Monday, 17 August
Overcast. High 83°, low 66°.
Pressure30.09 inHg
Wind7.3 mph SE
Humidity67%
Visibility—
Dew point66°
Tue, 1888° / 66°0
88 °
Galesburg, Tuesday, 18 August
Overcast. High 88°, low 66°.
Pressure29.91 inHg
Wind13.2 mph SE
Humidity67%
Visibility—
Dew point69°
Wed, 1990° / 70°0
90 °
Galesburg, Wednesday, 19 August
Mostly clear. High 90°, low 70°.
Pressure29.80 inHg
Wind11.2 mph SE
Humidity52%
Visibility—
Dew point67°
Thu, 2093° / 72°0
93 °
Galesburg, Thursday, 20 August
Overcast. High 93°, low 72°.
Pressure29.77 inHg
Wind14.1 mph NE
Humidity58%
Visibility—
Dew point70°
Fri, 2186° / 70°0.03
86 °
Galesburg, Friday, 21 August
Light rain. High 86°, low 70°.
Pressure29.94 inHg
Wind11.1 mph E
Humidity59%
Visibility—
Dew point65°
Sat, 22104° / 72°0
104 °
Galesburg, Saturday, 22 August
Clear. High 104°, low 72°.
Pressure29.74 inHg
Wind13.1 mph SW
Humidity41%
Visibility—
Dew point65°
Sun, 2392° / 76°0.06
92 °
Galesburg, Sunday, 23 August
Light rain. High 92°, low 76°.
Pressure29.83 inHg
Wind18.6 mph NE
Humidity65%
Visibility—
Dew point69°
Mon, 2491° / 70°0.02
91 °
Galesburg, Monday, 24 August
Light rain. High 91°, low 70°.
Pressure29.94 inHg
Wind13.1 mph E
Humidity59%
Visibility—
Dew point69°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 64°0.15
82 °
Galesburg, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.15 in
Chance of precipitation33%
Record high96° (2003)
Record low52° (2025)
Wed, 2681° / 65°0.19
81 °
Galesburg, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.19 in
Chance of precipitation30%
Record high94° (2013)
Record low49° (2025)
Thu, 2781° / 65°0.15
81 °
Galesburg, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.15 in
Chance of precipitation35%
Record high96° (2013)
Record low52° (1967)
Fri, 2881° / 64°0.18
81 °
Galesburg, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.18 in
Chance of precipitation32%
Record high96° (1984)
Record low44° (1986)
Sat, 2981° / 64°0.1
81 °
Galesburg, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.1 in
Chance of precipitation27%
Record high95° (1984)
Record low49° (1988)
Sun, 3080° / 64°0.13
80 °
Galesburg, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.13 in
Chance of precipitation27%
Record high97° (2013)
Record low50° (2009)
Mon, 3180° / 63°0.09
80 °
Galesburg, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.09 in
Chance of precipitation25%
Record high95° (2000)
Record low46° (2009)
Tue, 0179° / 62°0.11
79 °
Galesburg, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation27%
Record high95° (1984)
Record low46° (1967)
Wed, 0280° / 63°0.09
80 °
Galesburg, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.09 in
Chance of precipitation30%
Record high94° (2000)
Record low50° (1968)
Thu, 0379° / 63°0.08
79 °
Galesburg, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.08 in
Chance of precipitation27%
Record high93° (2023)
Record low42° (1974)
Fri, 0479° / 62°0.08
79 °
Galesburg, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.08 in
Chance of precipitation28%
Record high94° (2023)
Record low42° (1974)
Sat, 0579° / 61°0.07
79 °
Galesburg, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.07 in
Chance of precipitation20%
Record high92° (2023)
Record low43° (1962)
Sun, 0678° / 61°0.12
78 °
Galesburg, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.12 in
Chance of precipitation27%
Record high93° (1960)
Record low45° (1962)
Mon, 0778° / 61°0.17
78 °
Galesburg, Monday, 7 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.17 in
Chance of precipitation28%
Record high93° (1960)
Record low44° (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 Galesburg, IA 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 Galesburg, IA 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.