Monthly outlook for Jacksonville, IA: average high 82.4°, average low 63.6°. That is 0.7° above the climate normal for August. Precipitation is expected on 4 days (about 1.0 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 11 August (95.7°), the coolest 21 August (51.4°).
82.4°/63.6°
Average high / low
+0.7°
Above normal
4 / 5
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
82.8°
81.2°
+0.9°
18 August – 27 August
81.9°
81.2°
+0.4°
28 August – 6 September
at normal
80°
—
August records over 66 years
100.4°16 August 1983All-time high
43.2°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Kimballton (4 mi).
Sun, 0995° / 74°0.02
95 °
Jacksonville, Sunday, 9 August
Light rain. High 95°, low 74°.
Pressure29.77 inHg
Wind14.8 mph SW
Humidity47%
Visibility6.2 mi
Dew point66°
Mon, 1090° / 72°0
90 °
Jacksonville, Monday, 10 August
Overcast. High 90°, low 72°.
Pressure29.80 inHg
Wind10.4 mph S
Humidity55%
Visibility6.2 mi
Dew point66°
Tue, 1196° / 72°0
96 °
Jacksonville, Tuesday, 11 August
Mostly clear. High 96°, low 72°.
Pressure29.74 inHg
Wind1.9 mph S
Humidity43%
Visibility6.2 mi
Dew point64°
Wed, 1289° / 69°0.06
89 °
Jacksonville, Wednesday, 12 August
Light rain. High 89°, low 69°.
Pressure29.88 inHg
Wind9.8 mph E
Humidity50%
Visibility6.2 mi
Dew point62°
Thu, 1371° / 62°0.65
71 °
Jacksonville, Thursday, 13 August
Rain. High 71°, low 62°.
Pressure29.94 inHg
Wind17.2 mph NE
Humidity94%
Visibility—
Dew point62°
Fri, 1477° / 59°0
77 °
Jacksonville, Friday, 14 August
Overcast. High 77°, low 59°.
Pressure30.06 inHg
Wind15.5 mph E
Humidity54%
Visibility—
Dew point56°
Sat, 1566° / 59°0.12
66 °
Jacksonville, Saturday, 15 August
Light rain. High 66°, low 59°.
Pressure30.15 inHg
Wind11.5 mph E
Humidity98%
Visibility—
Dew point63°
Sun, 1678° / 60°0
78 °
Jacksonville, Sunday, 16 August
Light rain. High 78°, low 60°.
Pressure30.09 inHg
Wind6.2 mph SE
Humidity66%
Visibility—
Dew point63°
Mon, 1786° / 66°0
86 °
Jacksonville, Monday, 17 August
Clear. High 86°, low 66°.
Pressure30.03 inHg
Wind9.2 mph S
Humidity56%
Visibility—
Dew point64°
Tue, 1892° / 68°0.07
92 °
Jacksonville, Tuesday, 18 August
Light rain. High 92°, low 68°.
Pressure29.94 inHg
Wind10.6 mph SW
Humidity59%
Visibility—
Dew point69°
Wed, 1980° / 65°0.03
80 °
Jacksonville, Wednesday, 19 August
Light rain. High 80°, low 65°.
Pressure30.06 inHg
Wind15.9 mph NE
Humidity67%
Visibility—
Dew point58°
Thu, 2065° / 56°0.02
65 °
Jacksonville, Thursday, 20 August
Light rain. High 65°, low 56°.
Pressure30.12 inHg
Wind15.2 mph E
Humidity61%
Visibility—
Dew point50°
Fri, 2172° / 51°0
72 °
Jacksonville, Friday, 21 August
Overcast. High 72°, low 51°.
Pressure30.03 inHg
Wind14.7 mph SE
Humidity44%
Visibility—
Dew point45°
Sat, 2292° / 58°0.03
92 °
Jacksonville, Saturday, 22 August
Light rain. High 92°, low 58°.
Pressure29.80 inHg
Wind14.3 mph NW
Humidity31%
Visibility—
Dew point50°
Sun, 2391° / 65°0
91 °
Jacksonville, Sunday, 23 August
Mostly clear. High 91°, low 65°.
Pressure29.94 inHg
Wind8.6 mph SW
Humidity25%
Visibility—
Dew point46°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 65°0.07
81 °
Jacksonville, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high95° (2023)
Record low48° (1966)
Tue, 2581° / 64°0.11
81 °
Jacksonville, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.11 in
Chance of precipitation33%
Record high96° (2003)
Record low50° (2015)
Wed, 2681° / 65°0.15
81 °
Jacksonville, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.15 in
Chance of precipitation33%
Record high93° (2013)
Record low51° (2015)
Thu, 2781° / 65°0.12
81 °
Jacksonville, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.12 in
Chance of precipitation40%
Record high95° (2013)
Record low51° (1971)
Fri, 2881° / 64°0.18
81 °
Jacksonville, 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 low43° (1986)
Sat, 2982° / 64°0.11
82 °
Jacksonville, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.11 in
Chance of precipitation22%
Record high93° (2013)
Record low52° (1988)
Sun, 3080° / 64°0.08
80 °
Jacksonville, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation22%
Record high95° (2012)
Record low48° (2009)
Mon, 3180° / 63°0.07
80 °
Jacksonville, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.07 in
Chance of precipitation25%
Record high94° (2012)
Record low48° (2009)
Tue, 0180° / 63°0.09
80 °
Jacksonville, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.09 in
Chance of precipitation25%
Record high93° (1984)
Record low48° (1967)
Wed, 0280° / 63°0.11
80 °
Jacksonville, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.11 in
Chance of precipitation32%
Record high94° (2000)
Record low50° (1974)
Thu, 0379° / 63°0.08
79 °
Jacksonville, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.08 in
Chance of precipitation23%
Record high92° (2023)
Record low40° (1974)
Fri, 0479° / 62°0.09
79 °
Jacksonville, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.09 in
Chance of precipitation30%
Record high95° (2012)
Record low45° (1974)
Sat, 0579° / 62°0.09
79 °
Jacksonville, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.09 in
Chance of precipitation25%
Record high91° (1990)
Record low44° (1962)
Sun, 0680° / 62°0.06
80 °
Jacksonville, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
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 Jacksonville, 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 Jacksonville, 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.