Monthly outlook for Littleton, IL: average high 86.7°, average low 66°. That is 1.8° above the climate normal for August. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 11 August (101.9°), the coolest 24 August (59.4°).
86.7°/66°
Average high / low
+1.8°
Above normal
4 / 5
Wet days / normal
2.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
87.3°
83.6°
+2.1°
19 August – 28 August
85.7°
83.5°
+1.2°
29 August – 7 September
at normal
81.5°
—
August records over 66 years
100.4°15 August 2007All-time high
47.3°29 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Camden (10 mi).
Mon, 1097° / 76°0
97 °
Littleton, Monday, 10 August
Overcast. High 97°, low 76°.
Pressure29.88 inHg
Wind9.2 mph SW
Humidity51%
Visibility6.2 mi
Dew point68°
Tue, 11102° / 78°0
102 °
Littleton, Tuesday, 11 August
Mostly clear. High 102°, low 78°.
Pressure29.83 inHg
Wind14.9 mph SW
Humidity36%
Visibility6.2 mi
Dew point66°
Wed, 1294° / 70°0.1
94 °
Littleton, Wednesday, 12 August
Light rain. High 94°, low 70°.
Pressure29.83 inHg
Wind5.8 mph NE
Humidity48%
Visibility6.2 mi
Dew point68°
Thu, 1377° / 67°1.48
77 °
Littleton, Thursday, 13 August
Heavy rain. High 77°, low 67°.
Pressure29.88 inHg
Wind16.6 mph N
Humidity84%
Visibility—
Dew point71°
Fri, 1476° / 65°0.45
76 °
Littleton, Friday, 14 August
Rain. High 76°, low 65°.
Pressure30.03 inHg
Wind14.5 mph E
Humidity81%
Visibility—
Dew point67°
Sat, 1586° / 67°0.12
86 °
Littleton, Saturday, 15 August
Light rain. High 86°, low 67°.
Pressure30.09 inHg
Wind14.9 mph SE
Humidity70%
Visibility—
Dew point70°
Sun, 1681° / 66°0
81 °
Littleton, Sunday, 16 August
Overcast. High 81°, low 66°.
Pressure30.06 inHg
Wind13.5 mph NW
Humidity76%
Visibility—
Dew point69°
Mon, 1779° / 61°0
79 °
Littleton, Monday, 17 August
Partly cloudy. High 79°, low 61°.
Pressure30.09 inHg
Wind8.1 mph N
Humidity55%
Visibility—
Dew point58°
Tue, 1888° / 62°0
88 °
Littleton, Tuesday, 18 August
Overcast. High 88°, low 62°.
Pressure29.80 inHg
Wind14.5 mph S
Humidity59%
Visibility—
Dew point66°
Wed, 1982° / 65°0
82 °
Littleton, Wednesday, 19 August
Partly cloudy. High 82°, low 65°.
Pressure29.88 inHg
Wind14.3 mph NW
Humidity53%
Visibility—
Dew point61°
Thu, 2082° / 60°0
82 °
Littleton, Thursday, 20 August
Mostly clear. High 82°, low 60°.
Pressure29.94 inHg
Wind6.2 mph N
Humidity52%
Visibility—
Dew point58°
Fri, 2196° / 63°0.01
96 °
Littleton, Friday, 21 August
Light rain. High 96°, low 63°.
Pressure29.77 inHg
Wind18.3 mph SW
Humidity41%
Visibility—
Dew point60°
Sat, 2288° / 67°0.01
88 °
Littleton, Saturday, 22 August
Light rain. High 88°, low 67°.
Pressure29.85 inHg
Wind15.9 mph N
Humidity36%
Visibility—
Dew point55°
Sun, 2381° / 60°0
81 °
Littleton, Sunday, 23 August
Clear. High 81°, low 60°.
Pressure30.15 inHg
Wind7.8 mph N
Humidity42%
Visibility—
Dew point52°
Mon, 2485° / 59°0
85 °
Littleton, Monday, 24 August
Clear. High 85°, low 59°.
Pressure30.18 inHg
Wind9.3 mph E
Humidity40%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2584° / 67°0.12
84 °
Littleton, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high84°
Average low67°
Average precipitation0.12 in
Chance of precipitation30%
Record high96° (2003)
Record low55° (1966)
Wed, 2684° / 68°0.15
84 °
Littleton, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.15 in
Chance of precipitation30%
Record high98° (2003)
Record low51° (2025)
Thu, 2784° / 68°0.05
84 °
Littleton, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high84°
Average low68°
Average precipitation0.05 in
Chance of precipitation27%
Record high96° (1983)
Record low55° (2025)
Fri, 2883° / 67°0.13
83 °
Littleton, Friday, 28 August
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.13 in
Chance of precipitation33%
Record high96° (1984)
Record low51° (1986)
Sat, 2983° / 67°0.08
83 °
Littleton, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high83°
Average low67°
Average precipitation0.08 in
Chance of precipitation23%
Record high96° (1984)
Record low47° (1986)
Sun, 3082° / 66°0.09
82 °
Littleton, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.09 in
Chance of precipitation27%
Record high98° (2013)
Record low54° (2009)
Mon, 3182° / 65°0.1
82 °
Littleton, Monday, 31 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.1 in
Chance of precipitation25%
Record high94° (2013)
Record low53° (1967)
Tue, 0182° / 66°0.15
82 °
Littleton, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.15 in
Chance of precipitation30%
Record high98° (2011)
Record low48° (1967)
Wed, 0282° / 65°0.09
82 °
Littleton, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.09 in
Chance of precipitation28%
Record high95° (2011)
Record low51° (2017)
Thu, 0382° / 65°0.09
82 °
Littleton, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.09 in
Chance of precipitation27%
Record high93° (1960)
Record low48° (1974)
Fri, 0480° / 64°0.1
80 °
Littleton, Friday, 4 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.1 in
Chance of precipitation20%
Record high94° (1960)
Record low44° (1974)
Sat, 0581° / 64°0.04
81 °
Littleton, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.04 in
Chance of precipitation18%
Record high94° (1960)
Record low48° (1974)
Sun, 0680° / 64°0.08
80 °
Littleton, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.08 in
Chance of precipitation23%
Record high94° (1960)
Record low49° (1962)
Mon, 0781° / 63°0.1
81 °
Littleton, Monday, 7 September
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.1 in
Chance of precipitation25%
Record high94° (1960)
Record low47° (2025)
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 Littleton, 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 Littleton, 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.