Monthly outlook for Morton Mills, IA: average high 89.5°, average low 69.3°. That is 3.7° above the climate normal for August. Precipitation is expected on 5 days (about 1.1 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 22 August (113.1°), the coolest 15 August (62.3°).
89.5°/69.3°
Average high / low
+3.7°
Above normal
5 / 5
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
83.8°
82.8°
+0.5°
19 August – 28 August
99.1°
83°
+9°
29 August – 7 September
at normal
81.2°
—
August records over 66 years
101.7°16 August 1983All-time high
44.4°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Red Oak (13 mi).
Mon, 1089° / 73°0
89 °
Morton Mills, Monday, 10 August
Light rain. High 89°, low 73°.
Pressure29.85 inHg
Wind10.8 mph E
Humidity67%
Visibility6.2 mi
Dew point69°
Tue, 1197° / 70°0.03
97 °
Morton Mills, Tuesday, 11 August
Light rain. High 97°, low 70°.
Pressure29.74 inHg
Wind10.5 mph SW
Humidity47%
Visibility6.2 mi
Dew point67°
Wed, 1286° / 68°0.02
86 °
Morton Mills, Wednesday, 12 August
Light rain. High 86°, low 68°.
Pressure29.83 inHg
Wind10.7 mph E
Humidity75%
Visibility6.2 mi
Dew point71°
Thu, 1376° / 64°0.44
76 °
Morton Mills, Thursday, 13 August
Rain. High 76°, low 64°.
Pressure29.97 inHg
Wind21.3 mph NE
Humidity74%
Visibility—
Dew point66°
Fri, 1467° / 63°0.3
67 °
Morton Mills, Friday, 14 August
Rain. High 67°, low 63°.
Pressure30.06 inHg
Wind16 mph E
Humidity96%
Visibility—
Dew point64°
Sat, 1570° / 62°0.07
70 °
Morton Mills, Saturday, 15 August
Light rain. High 70°, low 62°.
Pressure30.15 inHg
Wind8.7 mph E
Humidity95%
Visibility—
Dew point65°
Sun, 1682° / 64°0
82 °
Morton Mills, Sunday, 16 August
Overcast. High 82°, low 64°.
Pressure30.12 inHg
Wind8.5 mph NE
Humidity66%
Visibility—
Dew point66°
Mon, 1782° / 69°0
82 °
Morton Mills, Monday, 17 August
Overcast. High 82°, low 69°.
Pressure30.06 inHg
Wind11 mph SE
Humidity64%
Visibility—
Dew point65°
Tue, 1896° / 67°0
96 °
Morton Mills, Tuesday, 18 August
Overcast. High 96°, low 67°.
Pressure29.85 inHg
Wind13 mph SE
Humidity59%
Visibility—
Dew point69°
Wed, 19104° / 74°0
104 °
Morton Mills, Wednesday, 19 August
Overcast. High 104°, low 74°.
Pressure29.77 inHg
Wind10.1 mph S
Humidity45%
Visibility—
Dew point66°
Thu, 2097° / 76°0
97 °
Morton Mills, Thursday, 20 August
Clear. High 97°, low 76°.
Pressure29.77 inHg
Wind14.5 mph NE
Humidity38%
Visibility—
Dew point63°
Fri, 2188° / 70°0
88 °
Morton Mills, Friday, 21 August
Overcast. High 88°, low 70°.
Pressure29.91 inHg
Wind14.3 mph E
Humidity48%
Visibility—
Dew point61°
Sat, 22113° / 74°0
113 °
Morton Mills, Saturday, 22 August
Partly cloudy. High 113°, low 74°.
Pressure29.71 inHg
Wind20 mph SW
Humidity19%
Visibility—
Dew point52°
Sun, 2397° / 71°0.07
97 °
Morton Mills, Sunday, 23 August
Light rain. High 97°, low 71°.
Pressure29.83 inHg
Wind10.6 mph NE
Humidity37%
Visibility—
Dew point61°
Mon, 2496° / 68°0.13
96 °
Morton Mills, Monday, 24 August
Light rain. High 96°, low 68°.
Pressure29.91 inHg
Wind13 mph SE
Humidity47%
Visibility—
Dew point65°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2583° / 66°0.12
83 °
Morton Mills, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.12 in
Chance of precipitation32%
Record high98° (2003)
Record low51° (2015)
Wed, 2683° / 66°0.21
83 °
Morton Mills, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.21 in
Chance of precipitation37%
Record high96° (1976)
Record low52° (2025)
Thu, 2783° / 66°0.14
83 °
Morton Mills, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.14 in
Chance of precipitation32%
Record high96° (1984)
Record low52° (1967)
Fri, 2883° / 65°0.15
83 °
Morton Mills, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.15 in
Chance of precipitation30%
Record high99° (1984)
Record low44° (1986)
Sat, 2983° / 65°0.07
83 °
Morton Mills, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.07 in
Chance of precipitation17%
Record high96° (1984)
Record low53° (1988)
Sun, 3082° / 65°0.1
82 °
Morton Mills, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.1 in
Chance of precipitation25%
Record high98° (2013)
Record low50° (2009)
Mon, 3182° / 65°0.13
82 °
Morton Mills, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.13 in
Chance of precipitation30%
Record high94° (1990)
Record low49° (2009)
Tue, 0181° / 65°0.07
81 °
Morton Mills, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high96° (1984)
Record low49° (1965)
Wed, 0281° / 64°0.11
81 °
Morton Mills, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.11 in
Chance of precipitation30%
Record high95° (2000)
Record low52° (1974)
Thu, 0381° / 64°0.09
81 °
Morton Mills, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.09 in
Chance of precipitation27%
Record high92° (2000)
Record low42° (1974)
Fri, 0481° / 63°0.13
81 °
Morton Mills, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.13 in
Chance of precipitation22%
Record high97° (2012)
Record low46° (1974)
Sat, 0580° / 63°0.12
80 °
Morton Mills, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.12 in
Chance of precipitation25%
Record high93° (1990)
Record low43° (1962)
Sun, 0681° / 63°0.07
81 °
Morton Mills, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.07 in
Chance of precipitation20%
Record high96° (1970)
Record low47° (2025)
Mon, 0780° / 62°0.17
80 °
Morton Mills, Monday, 7 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.17 in
Chance of precipitation32%
Record high94° (2013)
Record low46° (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 Morton Mills, 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 Morton Mills, 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.