Monthly outlook for St. Louis, MI: average high 80.5°, average low 58.4°. That is 1.1° above the climate normal for August. Precipitation is expected on 4 days (about 1.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 10 August (90.9°), the coolest 21 August (49°).
80.5°/58.4°
Average high / low
+1.1°
Above normal
4 / 5
Wet days / normal
1.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
81.4°
78.8°
+1.5°
18 August – 27 August
78.9°
78.1°
+0.4°
28 August – 6 September
at normal
76.6°
—
August records over 66 years
95°1 August 1988All-time high
41°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Ithaca (8 mi).
Sun, 0983° / 64°0.08
83 °
St. Louis, Sunday, 9 August
Light rain. High 83°, low 64°.
Pressure29.97 inHg
Wind13.1 mph S
Humidity41%
Visibility6.2 mi
Dew point54°
Mon, 1091° / 68°0.04
91 °
St. Louis, Monday, 10 August
Light rain. High 91°, low 68°.
Pressure29.88 inHg
Wind6.3 mph NW
Humidity53%
Visibility6.2 mi
Dew point63°
Tue, 1178° / 61°0.83
78 °
St. Louis, Tuesday, 11 August
Heavy rain. High 78°, low 61°.
Pressure29.80 inHg
Wind10.3 mph SE
Humidity71%
Visibility6.2 mi
Dew point68°
Wed, 1283° / 59°0
83 °
St. Louis, Wednesday, 12 August
Clear. High 83°, low 59°.
Pressure29.80 inHg
Wind6.7 mph NW
Humidity56%
Visibility6.2 mi
Dew point61°
Thu, 1375° / 53°0
75 °
St. Louis, Thursday, 13 August
Overcast. High 75°, low 53°.
Pressure30.00 inHg
Wind10 mph NW
Humidity38%
Visibility—
Dew point44°
Fri, 1480° / 53°0
80 °
St. Louis, Friday, 14 August
Clear. High 80°, low 53°.
Pressure30.06 inHg
Wind13.5 mph N
Humidity34%
Visibility—
Dew point45°
Sat, 1575° / 52°0
75 °
St. Louis, Saturday, 15 August
Overcast. High 75°, low 52°.
Pressure30.27 inHg
Wind6.6 mph SE
Humidity40%
Visibility—
Dew point47°
Sun, 1680° / 55°0
80 °
St. Louis, Sunday, 16 August
Overcast. High 80°, low 55°.
Pressure30.12 inHg
Wind8.6 mph SW
Humidity37%
Visibility—
Dew point48°
Mon, 1785° / 61°0
85 °
St. Louis, Monday, 17 August
Overcast. High 85°, low 61°.
Pressure30.00 inHg
Wind8.7 mph NW
Humidity42%
Visibility—
Dew point55°
Tue, 1886° / 63°0.02
86 °
St. Louis, Tuesday, 18 August
Light rain. High 86°, low 63°.
Pressure29.94 inHg
Wind13.1 mph SW
Humidity41%
Visibility—
Dew point57°
Wed, 1974° / 61°0.04
74 °
St. Louis, Wednesday, 19 August
Light rain. High 74°, low 61°.
Pressure29.77 inHg
Wind20.5 mph W
Humidity55%
Visibility—
Dew point56°
Thu, 2076° / 57°0
76 °
St. Louis, Thursday, 20 August
Overcast. High 76°, low 57°.
Pressure29.91 inHg
Wind16.5 mph N
Humidity35%
Visibility—
Dew point45°
Fri, 2177° / 49°0
77 °
St. Louis, Friday, 21 August
Overcast. High 77°, low 49°.
Pressure30.06 inHg
Wind8.5 mph E
Humidity32%
Visibility—
Dew point41°
Sat, 2275° / 51°0.04
75 °
St. Louis, Saturday, 22 August
Light rain. High 75°, low 51°.
Pressure29.97 inHg
Wind10 mph SE
Humidity34%
Visibility—
Dew point42°
Sun, 2384° / 60°0.03
84 °
St. Louis, Sunday, 23 August
Light rain. High 84°, low 60°.
Pressure29.77 inHg
Wind22 mph W
Humidity29%
Visibility—
Dew point46°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2478° / 61°0.09
78 °
St. Louis, Monday, 24 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.09 in
Chance of precipitation30%
Record high92° (2021)
Record low47° (1971)
Tue, 2578° / 61°0.06
78 °
St. Louis, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.06 in
Chance of precipitation23%
Record high93° (2021)
Record low45° (1977)
Wed, 2679° / 62°0.15
79 °
St. Louis, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.15 in
Chance of precipitation38%
Record high92° (2024)
Record low49° (2017)
Thu, 2779° / 62°0.11
79 °
St. Louis, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation40%
Record high93° (1973)
Record low48° (2025)
Fri, 2878° / 62°0.12
78 °
St. Louis, Friday, 28 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.12 in
Chance of precipitation37%
Record high91° (1973)
Record low44° (1986)
Sat, 2977° / 60°0.11
77 °
St. Louis, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.11 in
Chance of precipitation38%
Record high92° (2021)
Record low41° (1982)
Sun, 3077° / 60°0.06
77 °
St. Louis, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.06 in
Chance of precipitation25%
Record high90° (2010)
Record low45° (1976)
Mon, 3177° / 59°0.09
77 °
St. Louis, Monday, 31 August
Climate normal for this date — 60-year average.
Average high77°
Average low59°
Average precipitation0.09 in
Chance of precipitation20%
Record high91° (2010)
Record low46° (2009)
Tue, 0176° / 59°0.09
76 °
St. Louis, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.09 in
Chance of precipitation32%
Record high88° (1973)
Record low44° (1967)
Wed, 0277° / 59°0.06
77 °
St. Louis, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high77°
Average low59°
Average precipitation0.06 in
Chance of precipitation32%
Record high90° (2008)
Record low45° (1976)
Thu, 0377° / 59°0.07
77 °
St. Louis, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high77°
Average low59°
Average precipitation0.07 in
Chance of precipitation25%
Record high89° (1973)
Record low44° (1974)
Fri, 0476° / 58°0.06
76 °
St. Louis, Friday, 4 September
Climate normal for this date — 60-year average.
Average high76°
Average low58°
Average precipitation0.06 in
Chance of precipitation23%
Record high88° (2023)
Record low43° (1974)
Sat, 0576° / 58°0.07
76 °
St. Louis, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high76°
Average low58°
Average precipitation0.07 in
Chance of precipitation20%
Record high90° (2023)
Record low44° (1974)
Sun, 0676° / 58°0.07
76 °
St. Louis, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high76°
Average low58°
Average precipitation0.07 in
Chance of precipitation25%
Record high88° (2016)
Record low43° (1962)
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 St. Louis, MI 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 St. Louis, MI 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.