As of 22:16 CDT

Weather in Grant City, IA

71°Current weather

Grant City, Saturday, 8 August, 22:16

Overcast. Feels like 72°. High 80°, low 59°.

Pressure29.94 inHg
Wind9.4 mph SE
Humidity81%
Visibility6.2 mi
Dew point66°

Monthly outlook for Grant City, IA: average high 85.7°, average low 62.4°. That is 3.1° above the climate normal for August. Precipitation is expected on 4 days (about 0.4 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 18 August (100.7°), the coolest 21 August (51°).

85.7°/62.4°
Average high / low
+3.1°
Above normal
4 / 5
Wet days / normal
0.4 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
8 August – 17 August85°80.2°+2.7°
18 August – 27 August87°80.4°+3.7°
28 August – 6 Septemberat normal79.2°

August records over 66 years

99.7°16 August 1983All-time high
41.9°28 August 1986All-time low

Climate normals and records are computed from the nearest reference point — Lake City (8 mi).

Sun, 0993° / 72°0Clear
93 °Clear

Grant City, Sunday, 9 August

Clear. High 93°, low 72°.

Pressure29.74 inHg
Wind10.6 mph SW
Humidity34%
Visibility6.2 mi
Dew point62°
Mon, 1094° / 71°0Overcast
94 °Overcast

Grant City, Monday, 10 August

Overcast. High 94°, low 71°.

Pressure29.80 inHg
Wind9.6 mph SE
Humidity54%
Visibility6.2 mi
Dew point67°
Tue, 1198° / 65°0.01Light rain
98 °Light rain

Grant City, Tuesday, 11 August

Light rain. High 98°, low 65°.

Pressure29.77 inHg
Wind6.9 mph E
Humidity43%
Visibility6.2 mi
Dew point64°
Wed, 1291° / 69°0.04Light rain
91 °Light rain

Grant City, Wednesday, 12 August

Light rain. High 91°, low 69°.

Pressure29.88 inHg
Wind7.9 mph E
Humidity49%
Visibility6.2 mi
Dew point63°
Thu, 1370° / 60°0.11Light rain
70 °Light rain

Grant City, Thursday, 13 August

Light rain. High 70°, low 60°.

Pressure29.97 inHg
Wind8.6 mph E
Humidity91%
Visibility
Dew point62°
Fri, 1482° / 58°0Overcast
82 °Overcast

Grant City, Friday, 14 August

Overcast. High 82°, low 58°.

Pressure30.09 inHg
Wind14.9 mph E
Humidity42%
Visibility
Dew point51°
Sat, 1569° / 59°0.04Light rain
69 °Light rain

Grant City, Saturday, 15 August

Light rain. High 69°, low 59°.

Pressure30.18 inHg
Wind13 mph E
Humidity97%
Visibility
Dew point62°
Sun, 1680° / 59°0Overcast
80 °Overcast

Grant City, Sunday, 16 August

Overcast. High 80°, low 59°.

Pressure30.09 inHg
Wind6.4 mph SW
Humidity55%
Visibility
Dew point60°
Mon, 1794° / 65°0.02Light rain
94 °Light rain

Grant City, Monday, 17 August

Light rain. High 94°, low 65°.

Pressure30.00 inHg
Wind11.7 mph S
Humidity44%
Visibility
Dew point61°
Tue, 18101° / 69°0.06Light rain
101 °Light rain

Grant City, Tuesday, 18 August

Light rain. High 101°, low 69°.

Pressure29.91 inHg
Wind11.3 mph W
Humidity34%
Visibility
Dew point59°
Wed, 1986° / 64°0.04Light rain
86 °Light rain

Grant City, Wednesday, 19 August

Light rain. High 86°, low 64°.

Pressure30.06 inHg
Wind13.6 mph N
Humidity48%
Visibility
Dew point53°
Thu, 2067° / 55°0.05Light rain
67 °Light rain

Grant City, Thursday, 20 August

Light rain. High 67°, low 55°.

Pressure30.18 inHg
Wind10.2 mph SE
Humidity79%
Visibility
Dew point53°
Fri, 2179° / 51°0Overcast
79 °Overcast

Grant City, Friday, 21 August

Overcast. High 79°, low 51°.

Pressure30.03 inHg
Wind16.3 mph SE
Humidity35%
Visibility
Dew point43°
Sat, 2294° / 60°0.01Light rain
94 °Light rain

Grant City, Saturday, 22 August

Light rain. High 94°, low 60°.

Pressure29.80 inHg
Wind16.1 mph NW
Humidity31%
Visibility
Dew point51°
Sun, 2395° / 64°0Mostly clear
95 °Mostly clear

Grant City, Sunday, 23 August

Mostly clear. High 95°, low 64°.

Pressure29.94 inHg
Wind8.8 mph NW
Humidity18%
Visibility
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 64°0.08Climate normal
81 °Climate normal

Grant City, Monday, 24 August

Climate normal for this date — 60-year average.

Average high81°
Average low64°
Average precipitation0.08 in
Chance of precipitation22%
Record high96° (2023)
Record low48° (1966)
Tue, 2580° / 64°0.11Climate normal
80 °Climate normal

Grant 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°0.16Climate normal
80 °Climate normal

Grant 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°0.1Climate normal
80 °Climate normal

Grant 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°0.22Climate normal
81 °Climate normal

Grant 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°0.11Climate normal
81 °Climate normal

Grant 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°0.06Climate normal
79 °Climate normal

Grant 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°0.1Climate normal
79 °Climate normal

Grant 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°0.08Climate normal
79 °Climate normal

Grant 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°0.13Climate normal
79 °Climate normal

Grant 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°0.07Climate normal
78 °Climate normal

Grant 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°0.12Climate normal
78 °Climate normal

Grant 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°0.08Climate normal
78 °Climate normal

Grant 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°0.06Climate normal
79 °Climate normal

Grant 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)

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 Grant 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 Grant 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.