Monthly outlook for Lewistown, MO: average high 83.3°, average low 66.5°. That is 0.2° below the climate normal for August. Precipitation is expected on 6 days (about 3.0 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 11 August (99.5°), the coolest 21 August (52.4°).
83.3°/66.5°
Average high / low
−0.2°
Below normal
6 / 5
Wet days / normal
3.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
84.6°
83.8°
+0.4°
19 August – 28 August
81.3°
83.8°
-1.4°
29 August – 7 September
at normal
81.6°
—
August records over 66 years
100.8°2 August 2011All-time high
47.3°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Knox City (11 mi).
Mon, 1096° / 73°0
96 °
Lewistown, Monday, 10 August
Overcast. High 96°, low 73°.
Pressure29.85 inHg
Wind12.7 mph SW
Humidity47%
Visibility6.2 mi
Dew point69°
Tue, 11100° / 80°0
100 °
Lewistown, Tuesday, 11 August
Overcast. High 100°, low 80°.
Pressure29.80 inHg
Wind9.3 mph SW
Humidity55%
Visibility6.2 mi
Dew point68°
Wed, 1289° / 68°0.51
89 °
Lewistown, Wednesday, 12 August
Heavy rain. High 89°, low 68°.
Pressure29.88 inHg
Wind7.4 mph N
Humidity77%
Visibility6.2 mi
Dew point69°
Thu, 1377° / 67°1.84
77 °
Lewistown, Thursday, 13 August
Heavy rain. High 77°, low 67°.
Pressure29.85 inHg
Wind19.1 mph E
Humidity91%
Visibility—
Dew point71°
Fri, 1475° / 64°0.27
75 °
Lewistown, Friday, 14 August
Light rain. High 75°, low 64°.
Pressure30.06 inHg
Wind12.9 mph E
Humidity80%
Visibility—
Dew point67°
Sat, 1572° / 67°0.23
72 °
Lewistown, Saturday, 15 August
Light rain. High 72°, low 67°.
Pressure30.15 inHg
Wind15.3 mph SE
Humidity85%
Visibility—
Dew point67°
Sun, 1678° / 65°0
78 °
Lewistown, Sunday, 16 August
Overcast. High 78°, low 65°.
Pressure30.12 inHg
Wind9.6 mph E
Humidity82%
Visibility—
Dew point66°
Mon, 1783° / 67°0.08
83 °
Lewistown, Monday, 17 August
Light rain. High 83°, low 67°.
Pressure30.06 inHg
Wind5.9 mph E
Humidity69%
Visibility—
Dew point67°
Tue, 1886° / 67°0
86 °
Lewistown, Tuesday, 18 August
Overcast. High 86°, low 67°.
Pressure30.00 inHg
Wind5.9 mph SW
Humidity72%
Visibility—
Dew point70°
Wed, 1980° / 66°0
80 °
Lewistown, Wednesday, 19 August
Overcast. High 80°, low 66°.
Pressure29.94 inHg
Wind14.4 mph NE
Humidity68%
Visibility—
Dew point63°
Thu, 2075° / 57°0
75 °
Lewistown, Thursday, 20 August
Overcast. High 75°, low 57°.
Pressure30.06 inHg
Wind16 mph NE
Humidity51%
Visibility—
Dew point53°
Fri, 2172° / 52°0
72 °
Lewistown, Friday, 21 August
Overcast. High 72°, low 52°.
Pressure30.06 inHg
Wind9.8 mph E
Humidity51%
Visibility—
Dew point51°
Sat, 2284° / 61°0.09
84 °
Lewistown, Saturday, 22 August
Light rain. High 84°, low 61°.
Pressure29.85 inHg
Wind12.7 mph SE
Humidity69%
Visibility—
Dew point65°
Sun, 2390° / 67°0
90 °
Lewistown, Sunday, 23 August
Partly cloudy. High 90°, low 67°.
Pressure29.94 inHg
Wind7.7 mph W
Humidity52%
Visibility—
Dew point65°
Mon, 2486° / 70°0
86 °
Lewistown, Monday, 24 August
Overcast. High 86°, low 70°.
Pressure29.94 inHg
Wind10.1 mph S
Humidity61%
Visibility—
Dew point69°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2584° / 67°0.13
84 °
Lewistown, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.13 in
Chance of precipitation28%
Record high100° (2023)
Record low54° (1966)
Wed, 2684° / 67°0.16
84 °
Lewistown, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.16 in
Chance of precipitation32%
Record high100° (2003)
Record low53° (2025)
Thu, 2784° / 68°0.08
84 °
Lewistown, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.08 in
Chance of precipitation25%
Record high98° (2024)
Record low56° (2025)
Fri, 2884° / 67°0.08
84 °
Lewistown, Friday, 28 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.08 in
Chance of precipitation25%
Record high96° (2013)
Record low49° (1986)
Sat, 2984° / 66°0.11
84 °
Lewistown, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high84°
Average low66°
Average precipitation0.11 in
Chance of precipitation27%
Record high95° (1984)
Record low47° (1986)
Sun, 3083° / 66°0.09
83 °
Lewistown, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.09 in
Chance of precipitation25%
Record high99° (2013)
Record low52° (2009)
Mon, 3182° / 65°0.16
82 °
Lewistown, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.16 in
Chance of precipitation23%
Record high95° (2000)
Record low53° (1967)
Tue, 0182° / 65°0.15
82 °
Lewistown, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.15 in
Chance of precipitation23%
Record high96° (2011)
Record low48° (1967)
Wed, 0282° / 65°0.08
82 °
Lewistown, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.08 in
Chance of precipitation28%
Record high94° (2000)
Record low51° (1974)
Thu, 0382° / 65°0.08
82 °
Lewistown, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.08 in
Chance of precipitation27%
Record high95° (1960)
Record low47° (1974)
Fri, 0481° / 64°0.09
81 °
Lewistown, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.09 in
Chance of precipitation20%
Record high95° (1960)
Record low42° (1974)
Sat, 0581° / 63°0.05
81 °
Lewistown, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.05 in
Chance of precipitation22%
Record high95° (1960)
Record low48° (1974)
Sun, 0680° / 64°0.09
80 °
Lewistown, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.09 in
Chance of precipitation23%
Record high96° (1960)
Record low49° (1962)
Mon, 0781° / 63°0.15
81 °
Lewistown, Monday, 7 September
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.15 in
Chance of precipitation27%
Record high95° (2013)
Record low49° (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 Lewistown, MO 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 Lewistown, MO 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.