Monthly outlook for Archer, IL: average high 86.3°, average low 66.9°. That is 1.7° above the climate normal for August. Precipitation is expected on 3 days (about 0.9 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 10 August (96.1°), the coolest 23 August (55.3°).
86.3°/66.9°
Average high / low
+1.7°
Above normal
3 / 5
Wet days / normal
0.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
85.9°
83.2°
+1.5°
18 August – 27 August
86.9°
83.5°
+1.9°
28 August – 6 September
at normal
81.9°
—
August records over 66 years
99.3°14 August 2007All-time high
47.5°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Springfield (4 mi).
Sun, 0993° / 71°0
93 °
Archer, Sunday, 9 August
Overcast. High 93°, low 71°.
Pressure29.91 inHg
Wind15.9 mph S
Humidity59%
Visibility6.2 mi
Dew point73°
Mon, 1096° / 76°0
96 °
Archer, Monday, 10 August
Partly cloudy. High 96°, low 76°.
Pressure29.91 inHg
Wind15.1 mph SW
Humidity52%
Visibility6.2 mi
Dew point71°
Tue, 1192° / 78°0
92 °
Archer, Tuesday, 11 August
Overcast. High 92°, low 78°.
Pressure29.83 inHg
Wind16.4 mph SW
Humidity42%
Visibility6.2 mi
Dew point65°
Wed, 1291° / 74°0.02
91 °
Archer, Wednesday, 12 August
Light rain. High 91°, low 74°.
Pressure29.85 inHg
Wind11.2 mph NE
Humidity60%
Visibility6.2 mi
Dew point73°
Thu, 1374° / 66°0.5
74 °
Archer, Thursday, 13 August
Rain. High 74°, low 66°.
Pressure29.88 inHg
Wind11.1 mph NE
Humidity90%
Visibility—
Dew point70°
Fri, 1478° / 57°0
78 °
Archer, Friday, 14 August
Clear. High 78°, low 57°.
Pressure30.18 inHg
Wind10.6 mph NE
Humidity44%
Visibility—
Dew point51°
Sat, 1578° / 57°0
78 °
Archer, Saturday, 15 August
Partly cloudy. High 78°, low 57°.
Pressure30.30 inHg
Wind8.1 mph SE
Humidity42%
Visibility—
Dew point49°
Sun, 1681° / 58°0.02
81 °
Archer, Sunday, 16 August
Light rain. High 81°, low 58°.
Pressure30.15 inHg
Wind14 mph S
Humidity50%
Visibility—
Dew point58°
Mon, 1787° / 68°0.12
87 °
Archer, Monday, 17 August
Light rain. High 87°, low 68°.
Pressure29.91 inHg
Wind12.8 mph S
Humidity62%
Visibility—
Dew point70°
Tue, 1890° / 72°0
90 °
Archer, Tuesday, 18 August
Overcast. High 90°, low 72°.
Pressure30.00 inHg
Wind9.8 mph NE
Humidity53%
Visibility—
Dew point67°
Wed, 1993° / 68°0
93 °
Archer, Wednesday, 19 August
Mostly clear. High 93°, low 68°.
Pressure29.91 inHg
Wind10.8 mph S
Humidity50%
Visibility—
Dew point67°
Thu, 2086° / 70°0.21
86 °
Archer, Thursday, 20 August
Rain. High 86°, low 70°.
Pressure29.88 inHg
Wind9.2 mph NE
Humidity59%
Visibility—
Dew point68°
Fri, 2185° / 66°0
85 °
Archer, Friday, 21 August
Partly cloudy. High 85°, low 66°.
Pressure29.94 inHg
Wind11.2 mph NE
Humidity49%
Visibility—
Dew point60°
Sat, 2292° / 62°0.01
92 °
Archer, Saturday, 22 August
Light rain. High 92°, low 62°.
Pressure29.91 inHg
Wind18.4 mph NE
Humidity37%
Visibility—
Dew point55°
Sun, 2376° / 55°0.02
76 °
Archer, Sunday, 23 August
Light rain. High 76°, low 55°.
Pressure30.15 inHg
Wind12.6 mph E
Humidity38%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2483° / 66°0.11
83 °
Archer, Monday, 24 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.11 in
Chance of precipitation25%
Record high97° (2023)
Record low55° (1966)
Tue, 2584° / 67°0.08
84 °
Archer, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.08 in
Chance of precipitation32%
Record high94° (1983)
Record low56° (1966)
Wed, 2684° / 68°0.11
84 °
Archer, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.11 in
Chance of precipitation32%
Record high95° (2003)
Record low55° (2025)
Thu, 2784° / 68°0.09
84 °
Archer, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.09 in
Chance of precipitation32%
Record high94° (1983)
Record low56° (2025)
Fri, 2884° / 67°0.11
84 °
Archer, Friday, 28 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.11 in
Chance of precipitation28%
Record high96° (2013)
Record low51° (1986)
Sat, 2983° / 66°0.08
83 °
Archer, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low66°
Average precipitation0.08 in
Chance of precipitation27%
Record high95° (1984)
Record low47° (1986)
Sun, 3082° / 66°0.06
82 °
Archer, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.06 in
Chance of precipitation22%
Record high96° (2013)
Record low51° (1986)
Mon, 3182° / 66°0.09
82 °
Archer, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.09 in
Chance of precipitation33%
Record high97° (2013)
Record low53° (1967)
Tue, 0182° / 66°0.17
82 °
Archer, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.17 in
Chance of precipitation25%
Record high98° (2011)
Record low50° (1967)
Wed, 0282° / 65°0.11
82 °
Archer, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.11 in
Chance of precipitation22%
Record high96° (2011)
Record low51° (2017)
Thu, 0382° / 65°0.09
82 °
Archer, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.09 in
Chance of precipitation25%
Record high94° (2007)
Record low47° (1974)
Fri, 0481° / 64°0.1
81 °
Archer, Friday, 4 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.1 in
Chance of precipitation25%
Record high96° (2007)
Record low49° (1974)
Sat, 0581° / 64°0.04
81 °
Archer, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.04 in
Chance of precipitation20%
Record high94° (1990)
Record low50° (1974)
Sun, 0681° / 64°0.05
81 °
Archer, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.05 in
Chance of precipitation23%
Record high95° (1990)
Record low50° (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 Archer, IL 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 Archer, IL 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.