Monthly outlook for Byrnes Mill, MO: average high 89.2°, average low 69.8°. That is 1.4° above the climate normal for August. Precipitation is expected on 9 days (about 2.6 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 11 August (104.8°), the coolest 21 August (60.4°).
89.2°/69.8°
Average high / low
+1.4°
Above normal
9 / 5
Wet days / normal
2.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
90.4°
86.6°
+2.1°
18 August – 27 August
87.1°
86.8°
+0.2°
28 August – 6 September
at normal
84.5°
—
August records over 66 years
105.3°14 August 2007All-time high
52.3°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Pacific (10 mi).
Sun, 0996° / 72°0
96 °
Byrnes Mill, Sunday, 9 August
Overcast. High 96°, low 72°.
Pressure29.97 inHg
Wind7.9 mph SW
Humidity45%
Visibility6.2 mi
Dew point69°
Mon, 10103° / 77°0
103 °
Byrnes Mill, Monday, 10 August
Light rain. High 103°, low 77°.
Pressure29.94 inHg
Wind9.7 mph SW
Humidity36%
Visibility6.2 mi
Dew point67°
Tue, 11105° / 76°0.04
105 °
Byrnes Mill, Tuesday, 11 August
Light rain. High 105°, low 76°.
Pressure29.85 inHg
Wind9.5 mph SW
Humidity33%
Visibility6.2 mi
Dew point65°
Wed, 1290° / 73°0.11
90 °
Byrnes Mill, Wednesday, 12 August
Light rain. High 90°, low 73°.
Pressure29.88 inHg
Wind5.3 mph W
Humidity66%
Visibility6.2 mi
Dew point70°
Thu, 1380° / 72°1.79
80 °
Byrnes Mill, Thursday, 13 August
Heavy rain. High 80°, low 72°.
Pressure29.91 inHg
Wind7.4 mph SE
Humidity77%
Visibility—
Dew point69°
Fri, 1477° / 71°0.17
77 °
Byrnes Mill, Friday, 14 August
Light rain. High 77°, low 71°.
Pressure30.03 inHg
Wind10.3 mph SE
Humidity83%
Visibility—
Dew point71°
Sat, 1583° / 67°0.17
83 °
Byrnes Mill, Saturday, 15 August
Light rain. High 83°, low 67°.
Pressure30.15 inHg
Wind12.2 mph E
Humidity73%
Visibility—
Dew point68°
Sun, 1688° / 69°0
88 °
Byrnes Mill, Sunday, 16 August
Overcast. High 88°, low 69°.
Pressure30.06 inHg
Wind8.2 mph E
Humidity62%
Visibility—
Dew point69°
Mon, 1790° / 72°0.06
90 °
Byrnes Mill, Monday, 17 August
Light rain. High 90°, low 72°.
Pressure30.03 inHg
Wind6.6 mph NE
Humidity59%
Visibility—
Dew point69°
Tue, 1879° / 70°0.09
79 °
Byrnes Mill, Tuesday, 18 August
Light rain. High 79°, low 70°.
Pressure30.03 inHg
Wind8.7 mph W
Humidity90%
Visibility—
Dew point73°
Wed, 1993° / 69°0
93 °
Byrnes Mill, Wednesday, 19 August
Overcast. High 93°, low 69°.
Pressure29.88 inHg
Wind9.7 mph N
Humidity43%
Visibility—
Dew point63°
Thu, 2081° / 64°0
81 °
Byrnes Mill, Thursday, 20 August
Clear. High 81°, low 64°.
Pressure30.00 inHg
Wind7.7 mph NE
Humidity40%
Visibility—
Dew point51°
Fri, 2177° / 60°0.15
77 °
Byrnes Mill, Friday, 21 August
Light rain. High 77°, low 60°.
Pressure30.00 inHg
Wind10.2 mph SE
Humidity57%
Visibility—
Dew point55°
Sat, 2294° / 63°0.07
94 °
Byrnes Mill, Saturday, 22 August
Light rain. High 94°, low 63°.
Pressure29.83 inHg
Wind8.2 mph SE
Humidity46%
Visibility—
Dew point64°
Sun, 2398° / 72°0
98 °
Byrnes Mill, Sunday, 23 August
Clear. High 98°, low 72°.
Pressure29.94 inHg
Wind3.4 mph E
Humidity44%
Visibility—
Dew point67°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2487° / 68°0.07
87 °
Byrnes Mill, Monday, 24 August
Climate normal for this date — 60-year average.
Average high87°
Average low68°
Average precipitation0.07 in
Chance of precipitation25%
Record high98° (2011)
Record low58° (2015)
Tue, 2587° / 69°0.07
87 °
Byrnes Mill, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high87°
Average low69°
Average precipitation0.07 in
Chance of precipitation22%
Record high100° (2023)
Record low58° (2015)
Wed, 2687° / 69°0.17
87 °
Byrnes Mill, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high87°
Average low69°
Average precipitation0.17 in
Chance of precipitation30%
Record high101° (2003)
Record low55° (2025)
Thu, 2787° / 69°0.1
87 °
Byrnes Mill, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high87°
Average low69°
Average precipitation0.1 in
Chance of precipitation28%
Record high99° (1983)
Record low54° (2025)
Fri, 2887° / 69°0.07
87 °
Byrnes Mill, Friday, 28 August
Climate normal for this date — 60-year average.
Average high87°
Average low69°
Average precipitation0.07 in
Chance of precipitation27%
Record high99° (2000)
Record low55° (1967)
Sat, 2986° / 68°0.08
86 °
Byrnes Mill, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high86°
Average low68°
Average precipitation0.08 in
Chance of precipitation33%
Record high99° (1984)
Record low52° (1986)
Sun, 3085° / 68°0.15
85 °
Byrnes Mill, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high85°
Average low68°
Average precipitation0.15 in
Chance of precipitation30%
Record high99° (2013)
Record low54° (1986)
Mon, 3185° / 68°0.11
85 °
Byrnes Mill, Monday, 31 August
Climate normal for this date — 60-year average.
Average high85°
Average low68°
Average precipitation0.11 in
Chance of precipitation30%
Record high103° (2013)
Record low56° (1967)
Tue, 0184° / 68°0.11
84 °
Byrnes Mill, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.11 in
Chance of precipitation35%
Record high100° (2011)
Record low53° (1967)
Wed, 0284° / 67°0.13
84 °
Byrnes Mill, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.13 in
Chance of precipitation37%
Record high99° (2011)
Record low52° (1974)
Thu, 0384° / 67°0.09
84 °
Byrnes Mill, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.09 in
Chance of precipitation27%
Record high97° (2011)
Record low50° (1974)
Fri, 0483° / 66°0.11
83 °
Byrnes Mill, Friday, 4 September
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.11 in
Chance of precipitation25%
Record high97° (1960)
Record low49° (1974)
Sat, 0583° / 66°0.04
83 °
Byrnes Mill, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.04 in
Chance of precipitation22%
Record high98° (1990)
Record low52° (1974)
Sun, 0683° / 65°0.04
83 °
Byrnes Mill, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high83°
Average low65°
Average precipitation0.04 in
Chance of precipitation27%
Record high100° (1990)
Record low52° (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 Byrnes Mill, 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 Byrnes Mill, 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.