Monthly outlook for Littleton, IA: average high 76.5°, average low 61.3°. That is 1.4° below the climate normal for August. Precipitation is expected on 5 days (about 0.8 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 18 August (86.4°), the coolest 21 August (51.7°).
76.5°/61.3°
Average high / low
−1.4°
Below normal
5 / 5
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
78.2°
78.9°
-0.4°
19 August – 28 August
73.7°
79.1°
-3°
29 August – 7 September
at normal
77.4°
—
August records over 66 years
99.7°23 August 2023All-time high
43°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Dunkerton (7 mi).
Mon, 1086° / 70°0.06
86 °
Littleton, Monday, 10 August
Light rain. High 86°, low 70°.
Pressure29.85 inHg
Wind11.4 mph SE
Humidity83%
Visibility6.2 mi
Dew point74°
Tue, 1184° / 70°0
84 °
Littleton, Tuesday, 11 August
Overcast. High 84°, low 70°.
Pressure29.80 inHg
Wind5.9 mph N
Humidity76%
Visibility6.2 mi
Dew point72°
Wed, 1280° / 67°0
80 °
Littleton, Wednesday, 12 August
Overcast. High 80°, low 67°.
Pressure29.91 inHg
Wind7.6 mph NE
Humidity73%
Visibility6.2 mi
Dew point67°
Thu, 1372° / 61°0
72 °
Littleton, Thursday, 13 August
Light rain. High 72°, low 61°.
Pressure30.00 inHg
Wind10.2 mph E
Humidity80%
Visibility—
Dew point62°
Fri, 1476° / 57°0
76 °
Littleton, Friday, 14 August
Overcast. High 76°, low 57°.
Pressure30.12 inHg
Wind7.3 mph E
Humidity60%
Visibility—
Dew point58°
Sat, 1566° / 58°0.11
66 °
Littleton, Saturday, 15 August
Light rain. High 66°, low 58°.
Pressure30.27 inHg
Wind9.5 mph SE
Humidity87%
Visibility—
Dew point56°
Sun, 1668° / 59°0.03
68 °
Littleton, Sunday, 16 August
Light rain. High 68°, low 59°.
Pressure30.15 inHg
Wind5.6 mph SE
Humidity88%
Visibility—
Dew point59°
Mon, 1781° / 62°0
81 °
Littleton, Monday, 17 August
Mostly clear. High 81°, low 62°.
Pressure30.03 inHg
Wind8 mph SE
Humidity71%
Visibility—
Dew point67°
Tue, 1886° / 66°0.03
86 °
Littleton, Tuesday, 18 August
Light rain. High 86°, low 66°.
Pressure29.94 inHg
Wind14.2 mph SW
Humidity66%
Visibility—
Dew point69°
Wed, 1972° / 60°0.24
72 °
Littleton, Wednesday, 19 August
Rain. High 72°, low 60°.
Pressure30.03 inHg
Wind14.6 mph N
Humidity67%
Visibility—
Dew point58°
Thu, 2062° / 54°0.03
62 °
Littleton, Thursday, 20 August
Light rain. High 62°, low 54°.
Pressure30.15 inHg
Wind7.4 mph NE
Humidity78%
Visibility—
Dew point54°
Fri, 2173° / 52°0
73 °
Littleton, Friday, 21 August
Overcast. High 73°, low 52°.
Pressure30.06 inHg
Wind9.2 mph SE
Humidity64%
Visibility—
Dew point55°
Sat, 2282° / 56°0.19
82 °
Littleton, Saturday, 22 August
Rain. High 82°, low 56°.
Pressure29.83 inHg
Wind10.8 mph NW
Humidity74%
Visibility—
Dew point62°
Sun, 2380° / 61°0
80 °
Littleton, Sunday, 23 August
Clear. High 80°, low 61°.
Pressure29.94 inHg
Wind11.8 mph W
Humidity54%
Visibility—
Dew point56°
Mon, 2474° / 61°0.06
74 °
Littleton, Monday, 24 August
Light rain. High 74°, low 61°.
Pressure29.94 inHg
Wind12.1 mph SE
Humidity77%
Visibility—
Dew point65°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 63°0.14
80 °
Littleton, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.14 in
Chance of precipitation32%
Record high93° (2003)
Record low51° (2025)
Wed, 2680° / 64°0.15
80 °
Littleton, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.15 in
Chance of precipitation38%
Record high92° (2003)
Record low46° (1964)
Thu, 2779° / 64°0.15
79 °
Littleton, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.15 in
Chance of precipitation37%
Record high92° (2013)
Record low52° (1967)
Fri, 2879° / 63°0.23
79 °
Littleton, Friday, 28 August
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.23 in
Chance of precipitation38%
Record high92° (1984)
Record low43° (1986)
Sat, 2979° / 62°0.16
79 °
Littleton, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.16 in
Chance of precipitation32%
Record high92° (1984)
Record low47° (1986)
Sun, 3078° / 62°0.11
78 °
Littleton, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.11 in
Chance of precipitation30%
Record high91° (2012)
Record low48° (1974)
Mon, 3178° / 61°0.06
78 °
Littleton, Monday, 31 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.06 in
Chance of precipitation23%
Record high92° (2000)
Record low45° (2009)
Tue, 0178° / 61°0.09
78 °
Littleton, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.09 in
Chance of precipitation27%
Record high91° (2011)
Record low46° (1967)
Wed, 0278° / 61°0.1
78 °
Littleton, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.1 in
Chance of precipitation30%
Record high91° (2023)
Record low46° (1968)
Thu, 0377° / 61°0.1
77 °
Littleton, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.1 in
Chance of precipitation27%
Record high94° (2023)
Record low42° (1974)
Fri, 0477° / 60°0.08
77 °
Littleton, Friday, 4 September
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.08 in
Chance of precipitation23%
Record high94° (2023)
Record low42° (1974)
Sat, 0577° / 60°0.08
77 °
Littleton, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.08 in
Chance of precipitation25%
Record high91° (2023)
Record low42° (1962)
Sun, 0677° / 60°0.08
77 °
Littleton, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low60°
Average precipitation0.08 in
Chance of precipitation27%
Record high91° (1960)
Record low43° (1962)
Mon, 0776° / 60°0.14
76 °
Littleton, Monday, 7 September
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.14 in
Chance of precipitation27%
Record high91° (1978)
Record low44° (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, IA 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, IA 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.