Monthly outlook for Lake City, IA: average high 88.7°, average low 66.5°. That is 4.7° above the climate normal for August. Precipitation is expected on 7 days (about 1.5 inches), against a normal of 5 days and 2.0 inches. The warmest day looks like 22 August (113.9°), the coolest 15 August (59.3°).
88.7°/66.5°
Average high / low
+4.7°
Above normal
7 / 5
Wet days / normal
1.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
84.1°
80°
+2.3°
19 August – 28 August
96.3°
80.4°
+8.9°
29 August – 7 September
at normal
78.9°
—
August records over 66 years
99.7°16 August 1983All-time high
41.9°28 August 1986All-time low
Mon, 1086° / 70°0.1
86 °
Lake City, Monday, 10 August
Light rain. High 86°, low 70°.
Pressure29.85 inHg
Wind12.3 mph SE
Humidity54%
Visibility6.2 mi
Dew point67°
Tue, 1197° / 69°0
97 °
Lake City, Tuesday, 11 August
Partly cloudy. High 97°, low 69°.
Pressure29.74 inHg
Wind5.7 mph NE
Humidity43%
Visibility6.2 mi
Dew point65°
Wed, 1291° / 69°0.04
91 °
Lake City, Wednesday, 12 August
Light rain. High 91°, low 69°.
Pressure29.85 inHg
Wind10.6 mph E
Humidity53%
Visibility6.2 mi
Dew point64°
Thu, 1376° / 61°0.49
76 °
Lake City, Thursday, 13 August
Rain. High 76°, low 61°.
Pressure30.03 inHg
Wind13.4 mph NE
Humidity51%
Visibility—
Dew point54°
Fri, 1471° / 60°0.6
71 °
Lake City, Friday, 14 August
Heavy rain. High 71°, low 60°.
Pressure30.12 inHg
Wind14.9 mph SE
Humidity69%
Visibility—
Dew point59°
Sat, 1569° / 59°0.02
69 °
Lake City, Saturday, 15 August
Light rain. High 69°, low 59°.
Pressure30.15 inHg
Wind9.4 mph SE
Humidity87%
Visibility—
Dew point62°
Sun, 1685° / 64°0
85 °
Lake City, Sunday, 16 August
Overcast. High 85°, low 64°.
Pressure30.15 inHg
Wind7.4 mph NW
Humidity69%
Visibility—
Dew point65°
Mon, 1786° / 64°0
86 °
Lake City, Monday, 17 August
Overcast. High 86°, low 64°.
Pressure30.06 inHg
Wind10.4 mph SE
Humidity54%
Visibility—
Dew point61°
Tue, 1891° / 65°0
91 °
Lake City, Tuesday, 18 August
Overcast. High 91°, low 65°.
Pressure29.85 inHg
Wind15.3 mph SE
Humidity56%
Visibility—
Dew point66°
Wed, 1997° / 70°0
97 °
Lake City, Wednesday, 19 August
Overcast. High 97°, low 70°.
Pressure29.77 inHg
Wind11.7 mph SE
Humidity44%
Visibility—
Dew point66°
Thu, 2098° / 71°0
98 °
Lake City, Thursday, 20 August
Partly cloudy. High 98°, low 71°.
Pressure29.77 inHg
Wind20.4 mph N
Humidity34%
Visibility—
Dew point62°
Fri, 2185° / 62°0.06
85 °
Lake City, Friday, 21 August
Light rain. High 85°, low 62°.
Pressure29.94 inHg
Wind12.3 mph E
Humidity63%
Visibility—
Dew point60°
Sat, 22114° / 69°0
114 °
Lake City, Saturday, 22 August
Partly cloudy. High 114°, low 69°.
Pressure29.68 inHg
Wind18.4 mph SW
Humidity19%
Visibility—
Dew point50°
Sun, 2390° / 72°0.05
90 °
Lake City, Sunday, 23 August
Light rain. High 90°, low 72°.
Pressure29.83 inHg
Wind17.1 mph NE
Humidity50%
Visibility—
Dew point67°
Mon, 2494° / 70°0.09
94 °
Lake City, Monday, 24 August
Light rain. High 94°, low 70°.
Pressure29.94 inHg
Wind9.6 mph SE
Humidity48%
Visibility—
Dew point64°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 64°0.11
80 °
Lake City, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.11 in
Chance of precipitation33%
Record high94° (2003)
Record low50° (2025)
Wed, 2680° / 64°0.16
80 °
Lake City, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.16 in
Chance of precipitation35%
Record high96° (2024)
Record low51° (2025)
Thu, 2780° / 64°0.1
80 °
Lake City, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.1 in
Chance of precipitation32%
Record high94° (2013)
Record low49° (1971)
Fri, 2881° / 63°0.22
81 °
Lake City, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.22 in
Chance of precipitation33%
Record high97° (1984)
Record low42° (1986)
Sat, 2981° / 63°0.11
81 °
Lake City, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.11 in
Chance of precipitation22%
Record high94° (2012)
Record low49° (1988)
Sun, 3079° / 63°0.06
79 °
Lake City, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.06 in
Chance of precipitation23%
Record high95° (2012)
Record low47° (2009)
Mon, 3179° / 62°0.1
79 °
Lake City, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.1 in
Chance of precipitation30%
Record high91° (2012)
Record low47° (2009)
Tue, 0179° / 62°0.08
79 °
Lake City, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.08 in
Chance of precipitation25%
Record high91° (1984)
Record low46° (1967)
Wed, 0279° / 62°0.13
79 °
Lake City, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.13 in
Chance of precipitation38%
Record high94° (2023)
Record low50° (1974)
Thu, 0378° / 62°0.07
78 °
Lake City, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.07 in
Chance of precipitation23%
Record high94° (2023)
Record low40° (1974)
Fri, 0478° / 61°0.12
78 °
Lake City, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.12 in
Chance of precipitation30%
Record high95° (2012)
Record low44° (1974)
Sat, 0578° / 61°0.08
78 °
Lake City, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.08 in
Chance of precipitation28%
Record high91° (1960)
Record low41° (1962)
Sun, 0679° / 60°0.06
79 °
Lake City, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low60°
Average precipitation0.06 in
Chance of precipitation17%
Record high94° (2020)
Record low45° (2025)
Mon, 0778° / 60°0.15
78 °
Lake City, Monday, 7 September
Climate normal for this date — 60-year average.
Average high78°
Average low60°
Average precipitation0.15 in
Chance of precipitation28%
Record high92° (1978)
Record low43° (1986)
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 Lake City, 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 Lake City, 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.