Monthly outlook for Keyes Summit, MO: average high 89.1°, average low 71.5°. That is 1.8° above the climate normal for August. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 11 August (104.5°), the coolest 15 August (60.2°).
89.1°/71.5°
Average high / low
+1.8°
Above normal
4 / 5
Wet days / normal
1.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
91.2°
85.8°
+3°
18 August – 27 August
85.7°
85.9°
-0.2°
28 August – 6 September
at normal
83.7°
—
August records over 66 years
103.6°15 August 2007All-time high
52.3°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Winchester (4 mi).
Sun, 0998° / 74°0
98 °
Keyes Summit, Sunday, 9 August
Overcast. High 98°, low 74°.
Pressure29.94 inHg
Wind10.5 mph S
Humidity45%
Visibility6.2 mi
Dew point69°
Mon, 10103° / 77°0
103 °
Keyes Summit, Monday, 10 August
Clear. High 103°, low 77°.
Pressure29.94 inHg
Wind10.8 mph SW
Humidity38%
Visibility6.2 mi
Dew point67°
Tue, 11104° / 79°0.02
104 °
Keyes Summit, Tuesday, 11 August
Light rain. High 104°, low 79°.
Pressure29.88 inHg
Wind5.7 mph W
Humidity35%
Visibility6.2 mi
Dew point66°
Wed, 1289° / 77°0.01
89 °
Keyes Summit, Wednesday, 12 August
Light rain. High 89°, low 77°.
Pressure29.83 inHg
Wind4.9 mph W
Humidity48%
Visibility6.2 mi
Dew point68°
Thu, 1386° / 72°0.55
86 °
Keyes Summit, Thursday, 13 August
Rain. High 86°, low 72°.
Pressure29.85 inHg
Wind6.4 mph SE
Humidity65%
Visibility—
Dew point71°
Fri, 1480° / 66°0.02
80 °
Keyes Summit, Friday, 14 August
Light rain. High 80°, low 66°.
Pressure30.15 inHg
Wind9.6 mph NE
Humidity42%
Visibility—
Dew point53°
Sat, 1582° / 60°0
82 °
Keyes Summit, Saturday, 15 August
Overcast. High 82°, low 60°.
Pressure30.27 inHg
Wind8.3 mph E
Humidity41%
Visibility—
Dew point51°
Sun, 1680° / 65°0.09
80 °
Keyes Summit, Sunday, 16 August
Light rain. High 80°, low 65°.
Pressure30.18 inHg
Wind9.2 mph S
Humidity82%
Visibility—
Dew point65°
Mon, 17100° / 73°0.3
100 °
Keyes Summit, Monday, 17 August
Rain. High 100°, low 73°.
Pressure29.91 inHg
Wind12.8 mph SW
Humidity43%
Visibility—
Dew point66°
Tue, 1892° / 77°0
92 °
Keyes Summit, Tuesday, 18 August
Overcast. High 92°, low 77°.
Pressure29.97 inHg
Wind7.9 mph NE
Humidity51%
Visibility—
Dew point68°
Wed, 1996° / 75°0
96 °
Keyes Summit, Wednesday, 19 August
Partly cloudy. High 96°, low 75°.
Pressure29.88 inHg
Wind6.7 mph SE
Humidity50%
Visibility—
Dew point69°
Thu, 2087° / 75°0.62
87 °
Keyes Summit, Thursday, 20 August
Rain. High 87°, low 75°.
Pressure29.88 inHg
Wind11 mph SE
Humidity61%
Visibility—
Dew point70°
Fri, 2180° / 72°0.03
80 °
Keyes Summit, Friday, 21 August
Light rain. High 80°, low 72°.
Pressure29.91 inHg
Wind6.6 mph N
Humidity68%
Visibility—
Dew point67°
Sat, 2287° / 69°0
87 °
Keyes Summit, Saturday, 22 August
Overcast. High 87°, low 69°.
Pressure29.94 inHg
Wind4.6 mph E
Humidity44%
Visibility—
Dew point59°
Sun, 2373° / 64°0.03
73 °
Keyes Summit, Sunday, 23 August
Light rain. High 73°, low 64°.
Pressure30.12 inHg
Wind10.6 mph NE
Humidity57%
Visibility—
Dew point55°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2486° / 68°0.08
86 °
Keyes Summit, Monday, 24 August
Climate normal for this date — 60-year average.
Average high86°
Average low68°
Average precipitation0.08 in
Chance of precipitation25%
Record high99° (2023)
Record low59° (2015)
Tue, 2587° / 69°0.06
87 °
Keyes Summit, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high87°
Average low69°
Average precipitation0.06 in
Chance of precipitation20%
Record high101° (2023)
Record low58° (2015)
Wed, 2686° / 69°0.15
86 °
Keyes Summit, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high86°
Average low69°
Average precipitation0.15 in
Chance of precipitation32%
Record high99° (1983)
Record low57° (2025)
Thu, 2786° / 69°0.1
86 °
Keyes Summit, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high86°
Average low69°
Average precipitation0.1 in
Chance of precipitation30%
Record high98° (1983)
Record low57° (2025)
Fri, 2886° / 69°0.08
86 °
Keyes Summit, Friday, 28 August
Climate normal for this date — 60-year average.
Average high86°
Average low69°
Average precipitation0.08 in
Chance of precipitation28%
Record high97° (2000)
Record low55° (1967)
Sat, 2985° / 68°0.08
85 °
Keyes Summit, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high85°
Average low68°
Average precipitation0.08 in
Chance of precipitation27%
Record high97° (1984)
Record low52° (1986)
Sun, 3084° / 68°0.14
84 °
Keyes Summit, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.14 in
Chance of precipitation30%
Record high98° (2013)
Record low54° (1986)
Mon, 3184° / 68°0.11
84 °
Keyes Summit, Monday, 31 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.11 in
Chance of precipitation32%
Record high102° (2013)
Record low56° (1967)
Tue, 0184° / 68°0.1
84 °
Keyes Summit, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.1 in
Chance of precipitation33%
Record high99° (2011)
Record low53° (1967)
Wed, 0283° / 67°0.12
83 °
Keyes Summit, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.12 in
Chance of precipitation37%
Record high98° (2011)
Record low53° (1974)
Thu, 0383° / 67°0.1
83 °
Keyes Summit, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.1 in
Chance of precipitation30%
Record high96° (2011)
Record low50° (1974)
Fri, 0483° / 66°0.11
83 °
Keyes Summit, Friday, 4 September
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.11 in
Chance of precipitation28%
Record high97° (1960)
Record low51° (1974)
Sat, 0583° / 66°0.04
83 °
Keyes Summit, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.04 in
Chance of precipitation20%
Record high97° (1998)
Record low53° (1974)
Sun, 0683° / 66°0.04
83 °
Keyes Summit, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.04 in
Chance of precipitation23%
Record high99° (1990)
Record low53° (2017)
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 Keyes Summit, 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 Keyes Summit, 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.