Monthly outlook for Thornburg, IA: average high 85.4°, average low 64.7°. That is 2° above the climate normal for August. Precipitation is expected on 3 days (about 1.6 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 11 August (100.8°), the coolest 23 August (59.5°).
85.4°/64.7°
Average high / low
+2°
Above normal
3 / 5
Wet days / normal
1.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
84.7°
81.8°
+1.6°
19 August – 28 August
86.4°
81.9°
+2.5°
29 August – 7 September
at normal
80.1°
—
August records over 66 years
101.8°16 August 1988All-time high
45°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Rose Hill (11 mi).
Mon, 1093° / 72°0
93 °
Thornburg, Monday, 10 August
Light rain. High 93°, low 72°.
Pressure29.85 inHg
Wind1.7 mph S
Humidity51%
Visibility6.2 mi
Dew point67°
Tue, 11101° / 70°0.01
101 °
Thornburg, Tuesday, 11 August
Light rain. High 101°, low 70°.
Pressure29.74 inHg
Wind13.5 mph SW
Humidity37%
Visibility6.2 mi
Dew point64°
Wed, 1288° / 69°0.01
88 °
Thornburg, Wednesday, 12 August
Light rain. High 88°, low 69°.
Pressure29.85 inHg
Wind10 mph E
Humidity59%
Visibility6.2 mi
Dew point70°
Thu, 1370° / 65°0.44
70 °
Thornburg, Thursday, 13 August
Rain. High 70°, low 65°.
Pressure29.91 inHg
Wind15.8 mph E
Humidity97%
Visibility—
Dew point69°
Fri, 1472° / 63°0.48
72 °
Thornburg, Friday, 14 August
Rain. High 72°, low 63°.
Pressure30.06 inHg
Wind17.2 mph E
Humidity87%
Visibility—
Dew point65°
Sat, 1581° / 64°0.54
81 °
Thornburg, Saturday, 15 August
Rain. High 81°, low 64°.
Pressure30.09 inHg
Wind13.1 mph E
Humidity89%
Visibility—
Dew point68°
Sun, 1680° / 64°0.03
80 °
Thornburg, Sunday, 16 August
Light rain. High 80°, low 64°.
Pressure30.09 inHg
Wind13.5 mph NW
Humidity62%
Visibility—
Dew point63°
Mon, 1780° / 61°0
80 °
Thornburg, Monday, 17 August
Overcast. High 80°, low 61°.
Pressure30.12 inHg
Wind7.1 mph SE
Humidity57%
Visibility—
Dew point60°
Tue, 1886° / 62°0.02
86 °
Thornburg, Tuesday, 18 August
Light rain. High 86°, low 62°.
Pressure29.80 inHg
Wind9.6 mph S
Humidity61%
Visibility—
Dew point65°
Wed, 1981° / 65°0
81 °
Thornburg, Wednesday, 19 August
Partly cloudy. High 81°, low 65°.
Pressure29.91 inHg
Wind15.4 mph NW
Humidity50%
Visibility—
Dew point57°
Thu, 2084° / 61°0
84 °
Thornburg, Thursday, 20 August
Clear. High 84°, low 61°.
Pressure29.94 inHg
Wind7.6 mph NW
Humidity45%
Visibility—
Dew point56°
Fri, 2193° / 62°0.04
93 °
Thornburg, Friday, 21 August
Light rain. High 93°, low 62°.
Pressure29.71 inHg
Wind13.5 mph S
Humidity43%
Visibility—
Dew point61°
Sat, 2285° / 68°0
85 °
Thornburg, Saturday, 22 August
Mostly clear. High 85°, low 68°.
Pressure29.88 inHg
Wind17.3 mph N
Humidity32%
Visibility—
Dew point50°
Sun, 2386° / 60°0
86 °
Thornburg, Sunday, 23 August
Clear. High 86°, low 60°.
Pressure30.15 inHg
Wind7.6 mph SE
Humidity39%
Visibility—
Dew point52°
Mon, 2490° / 61°0
90 °
Thornburg, Monday, 24 August
Clear. High 90°, low 61°.
Pressure30.15 inHg
Wind12.6 mph SE
Humidity35%
Visibility—
Dew point52°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2582° / 65°0.17
82 °
Thornburg, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.17 in
Chance of precipitation35%
Record high98° (2003)
Record low52° (1966)
Wed, 2682° / 65°0.22
82 °
Thornburg, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.22 in
Chance of precipitation35%
Record high96° (1983)
Record low50° (2025)
Thu, 2782° / 66°0.12
82 °
Thornburg, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low66°
Average precipitation0.12 in
Chance of precipitation30%
Record high96° (2013)
Record low54° (1967)
Fri, 2882° / 65°0.13
82 °
Thornburg, Friday, 28 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.13 in
Chance of precipitation33%
Record high98° (1984)
Record low45° (1986)
Sat, 2982° / 65°0.07
82 °
Thornburg, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.07 in
Chance of precipitation28%
Record high96° (1984)
Record low49° (1986)
Sun, 3081° / 64°0.11
81 °
Thornburg, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.11 in
Chance of precipitation28%
Record high99° (2013)
Record low50° (2009)
Mon, 3180° / 63°0.12
80 °
Thornburg, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.12 in
Chance of precipitation25%
Record high96° (2000)
Record low46° (2009)
Tue, 0180° / 64°0.11
80 °
Thornburg, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low64°
Average precipitation0.11 in
Chance of precipitation30%
Record high96° (1984)
Record low46° (1967)
Wed, 0281° / 64°0.09
81 °
Thornburg, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high81°
Average low64°
Average precipitation0.09 in
Chance of precipitation28%
Record high95° (2000)
Record low51° (1967)
Thu, 0380° / 63°0.07
80 °
Thornburg, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.07 in
Chance of precipitation25%
Record high94° (1960)
Record low44° (1974)
Fri, 0479° / 62°0.07
79 °
Thornburg, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.07 in
Chance of precipitation20%
Record high95° (1960)
Record low42° (1974)
Sat, 0580° / 62°0.07
80 °
Thornburg, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.07 in
Chance of precipitation18%
Record high95° (1960)
Record low45° (1962)
Sun, 0679° / 62°0.11
79 °
Thornburg, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.11 in
Chance of precipitation30%
Record high95° (1960)
Record low46° (1962)
Mon, 0779° / 62°0.19
79 °
Thornburg, Monday, 7 September
Climate normal for this date — 60-year average.
Average high79°
Average low62°
Average precipitation0.19 in
Chance of precipitation30%
Record high94° (2013)
Record low45° (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 Thornburg, 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 Thornburg, 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.