Monthly outlook for Randolph, IL: average high 80.7°, average low 64.4°. That is 0.2° below the climate normal for August. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 9 August (91.6°), the coolest 23 August (49.4°).
80.7°/64.4°
Average high / low
−0.2°
Below normal
4 / 5
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
81.2°
81.1°
+0.1°
18 August – 27 August
79.8°
81.4°
-0.9°
28 August – 6 September
at normal
80°
—
August records over 66 years
97°17 August 1988All-time high
45.1°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Bloomington (7 mi).
Sun, 0992° / 70°0
92 °
Randolph, Sunday, 9 August
Overcast. High 92°, low 70°.
Pressure29.94 inHg
Wind16.3 mph S
Humidity74%
Visibility6.2 mi
Dew point75°
Mon, 1090° / 75°0.01
90 °
Randolph, Monday, 10 August
Light rain. High 90°, low 75°.
Pressure29.91 inHg
Wind11.7 mph SW
Humidity68%
Visibility6.2 mi
Dew point74°
Tue, 1188° / 74°0.02
88 °
Randolph, Tuesday, 11 August
Light rain. High 88°, low 74°.
Pressure29.85 inHg
Wind7.8 mph SW
Humidity76%
Visibility6.2 mi
Dew point74°
Wed, 1278° / 69°0.04
78 °
Randolph, Wednesday, 12 August
Light rain. High 78°, low 69°.
Pressure29.88 inHg
Wind11.6 mph N
Humidity78%
Visibility6.2 mi
Dew point74°
Thu, 1372° / 64°0.46
72 °
Randolph, Thursday, 13 August
Rain. High 72°, low 64°.
Pressure29.88 inHg
Wind10.8 mph NE
Humidity96%
Visibility—
Dew point70°
Fri, 1474° / 54°0
74 °
Randolph, Friday, 14 August
Clear. High 74°, low 54°.
Pressure30.18 inHg
Wind9.2 mph NE
Humidity64%
Visibility—
Dew point57°
Sat, 1573° / 55°0
73 °
Randolph, Saturday, 15 August
Partly cloudy. High 73°, low 55°.
Pressure30.30 inHg
Wind8.1 mph SE
Humidity57%
Visibility—
Dew point53°
Sun, 1678° / 56°0
78 °
Randolph, Sunday, 16 August
Partly cloudy. High 78°, low 56°.
Pressure30.18 inHg
Wind11.3 mph S
Humidity62%
Visibility—
Dew point59°
Mon, 1781° / 66°0.05
81 °
Randolph, Monday, 17 August
Light rain. High 81°, low 66°.
Pressure29.97 inHg
Wind13.3 mph S
Humidity82%
Visibility—
Dew point72°
Tue, 1882° / 69°0.01
82 °
Randolph, Tuesday, 18 August
Light rain. High 82°, low 69°.
Pressure30.00 inHg
Wind8.3 mph NE
Humidity72%
Visibility—
Dew point70°
Wed, 1986° / 67°0.01
86 °
Randolph, Wednesday, 19 August
Light rain. High 86°, low 67°.
Pressure29.91 inHg
Wind8 mph S
Humidity67%
Visibility—
Dew point70°
Thu, 2080° / 67°0.18
80 °
Randolph, Thursday, 20 August
Light rain. High 80°, low 67°.
Pressure29.88 inHg
Wind10.3 mph N
Humidity74%
Visibility—
Dew point70°
Fri, 2180° / 62°0
80 °
Randolph, Friday, 21 August
Mostly clear. High 80°, low 62°.
Pressure29.94 inHg
Wind8.6 mph NE
Humidity65%
Visibility—
Dew point64°
Sat, 2282° / 62°0.01
82 °
Randolph, Saturday, 22 August
Light rain. High 82°, low 62°.
Pressure29.94 inHg
Wind17.8 mph NE
Humidity72%
Visibility—
Dew point66°
Sun, 2368° / 49°0
68 °
Randolph, Sunday, 23 August
Mostly clear. High 68°, low 49°.
Pressure30.21 inHg
Wind13.6 mph E
Humidity54%
Visibility—
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2481° / 65°0.1
81 °
Randolph, Monday, 24 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.1 in
Chance of precipitation30%
Record high95° (2023)
Record low53° (1966)
Tue, 2582° / 65°0.12
82 °
Randolph, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.12 in
Chance of precipitation30%
Record high92° (2014)
Record low55° (1966)
Wed, 2682° / 66°0.13
82 °
Randolph, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.13 in
Chance of precipitation37%
Record high92° (2003)
Record low53° (1964)
Thu, 2782° / 66°0.09
82 °
Randolph, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.09 in
Chance of precipitation25%
Record high94° (2024)
Record low52° (1968)
Fri, 2882° / 65°0.12
82 °
Randolph, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.12 in
Chance of precipitation28%
Record high93° (2013)
Record low48° (1986)
Sat, 2981° / 65°0.13
81 °
Randolph, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.13 in
Chance of precipitation33%
Record high94° (1984)
Record low45° (1986)
Sun, 3080° / 64°0.08
80 °
Randolph, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation27%
Record high94° (2013)
Record low50° (1986)
Mon, 3180° / 64°0.08
80 °
Randolph, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation30%
Record high93° (2011)
Record low50° (2009)
Tue, 0180° / 64°0.15
80 °
Randolph, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.15 in
Chance of precipitation25%
Record high99° (2011)
Record low49° (1967)
Wed, 0280° / 64°0.07
80 °
Randolph, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.07 in
Chance of precipitation22%
Record high97° (2011)
Record low49° (2017)
Thu, 0380° / 64°0.07
80 °
Randolph, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.07 in
Chance of precipitation25%
Record high94° (2011)
Record low47° (1974)
Fri, 0479° / 62°0.11
79 °
Randolph, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation30%
Record high92° (1960)
Record low46° (1974)
Sat, 0579° / 62°0.04
79 °
Randolph, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.04 in
Chance of precipitation23%
Record high91° (1990)
Record low50° (1997)
Sun, 0679° / 62°0.09
79 °
Randolph, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.09 in
Chance of precipitation30%
Record high93° (1960)
Record low46° (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 Randolph, 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 Randolph, 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.