Monthly outlook for Lewisburg, IN: average high 79.3°, average low 62.2°. That is 0.7° below the climate normal for August. Precipitation is expected on 7 days (about 2.4 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 10 August (93.6°), the coolest 24 August (55.7°).
79.3°/62.2°
Average high / low
−0.7°
Below normal
7 / 5
Wet days / normal
2.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
80.2°
80.6°
-0.2°
19 August – 28 August
77.7°
80.8°
-1.7°
29 August – 7 September
at normal
79.5°
—
August records over 66 years
98.2°17 August 1988All-time high
43.3°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Onward (4 mi).
Mon, 1094° / 74°0.56
94 °
Lewisburg, Monday, 10 August
Heavy rain. High 94°, low 74°.
Pressure29.94 inHg
Wind13.6 mph W
Humidity74%
Visibility6.2 mi
Dew point73°
Tue, 1187° / 67°0.93
87 °
Lewisburg, Tuesday, 11 August
Heavy rain. High 87°, low 67°.
Pressure29.91 inHg
Wind6.8 mph SW
Humidity78%
Visibility6.2 mi
Dew point73°
Wed, 1282° / 67°0.17
82 °
Lewisburg, Wednesday, 12 August
Rain. High 82°, low 67°.
Pressure29.83 inHg
Wind6.4 mph NW
Humidity75%
Visibility6.2 mi
Dew point70°
Thu, 1378° / 62°0.19
78 °
Lewisburg, Thursday, 13 August
Rain. High 78°, low 62°.
Pressure29.94 inHg
Wind8.6 mph E
Humidity72%
Visibility6.2 mi
Dew point64°
Fri, 1475° / 63°0.07
75 °
Lewisburg, Friday, 14 August
Light rain. High 75°, low 63°.
Pressure30.12 inHg
Wind10.9 mph NE
Humidity67%
Visibility—
Dew point61°
Sat, 1572° / 59°0.02
72 °
Lewisburg, Saturday, 15 August
Light rain. High 72°, low 59°.
Pressure30.27 inHg
Wind14.2 mph E
Humidity67%
Visibility—
Dew point58°
Sun, 1678° / 62°0.15
78 °
Lewisburg, Sunday, 16 August
Light rain. High 78°, low 62°.
Pressure29.94 inHg
Wind10.4 mph SE
Humidity83%
Visibility—
Dew point70°
Mon, 1774° / 63°0.01
74 °
Lewisburg, Monday, 17 August
Light rain. High 74°, low 63°.
Pressure30.06 inHg
Wind7.8 mph NW
Humidity67%
Visibility—
Dew point61°
Tue, 1875° / 59°0
75 °
Lewisburg, Tuesday, 18 August
Overcast. High 75°, low 59°.
Pressure29.94 inHg
Wind7.6 mph S
Humidity70%
Visibility—
Dew point62°
Wed, 1980° / 62°0.02
80 °
Lewisburg, Wednesday, 19 August
Light rain. High 80°, low 62°.
Pressure29.77 inHg
Wind14 mph NW
Humidity67%
Visibility—
Dew point66°
Thu, 2074° / 56°0
74 °
Lewisburg, Thursday, 20 August
Overcast. High 74°, low 56°.
Pressure29.94 inHg
Wind9.7 mph N
Humidity64%
Visibility—
Dew point58°
Fri, 2179° / 59°0.01
79 °
Lewisburg, Friday, 21 August
Light rain. High 79°, low 59°.
Pressure29.88 inHg
Wind10.9 mph SW
Humidity65%
Visibility—
Dew point63°
Sat, 2282° / 64°0.21
82 °
Lewisburg, Saturday, 22 August
Light rain. High 82°, low 64°.
Pressure29.80 inHg
Wind13 mph SW
Humidity74%
Visibility—
Dew point69°
Sun, 2374° / 58°0
74 °
Lewisburg, Sunday, 23 August
Clear. High 74°, low 58°.
Pressure30.12 inHg
Wind10.9 mph N
Humidity56%
Visibility—
Dew point55°
Mon, 2477° / 56°0
77 °
Lewisburg, Monday, 24 August
Clear. High 77°, low 56°.
Pressure30.21 inHg
Wind6.1 mph SE
Humidity49%
Visibility—
Dew point53°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2581° / 63°0.09
81 °
Lewisburg, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high81°
Average low63°
Average precipitation0.09 in
Chance of precipitation28%
Record high93° (2020)
Record low52° (2017)
Wed, 2682° / 64°0.1
82 °
Lewisburg, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high82°
Average low64°
Average precipitation0.1 in
Chance of precipitation32%
Record high92° (2020)
Record low51° (2025)
Thu, 2782° / 65°0.11
82 °
Lewisburg, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high82°
Average low65°
Average precipitation0.11 in
Chance of precipitation35%
Record high93° (2024)
Record low50° (2025)
Fri, 2881° / 65°0.16
81 °
Lewisburg, Friday, 28 August
Climate normal for this date — 60-year average.
Average high81°
Average low65°
Average precipitation0.16 in
Chance of precipitation35%
Record high91° (1990)
Record low48° (1986)
Sat, 2980° / 63°0.11
80 °
Lewisburg, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.11 in
Chance of precipitation33%
Record high91° (1991)
Record low43° (1965)
Sun, 3080° / 63°0.07
80 °
Lewisburg, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.07 in
Chance of precipitation32%
Record high91° (2013)
Record low48° (1986)
Mon, 3180° / 62°0.07
80 °
Lewisburg, Monday, 31 August
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.07 in
Chance of precipitation28%
Record high91° (2011)
Record low48° (2009)
Tue, 0180° / 62°0.12
80 °
Lewisburg, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.12 in
Chance of precipitation23%
Record high97° (2011)
Record low47° (1967)
Wed, 0280° / 63°0.08
80 °
Lewisburg, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high80°
Average low63°
Average precipitation0.08 in
Chance of precipitation27%
Record high98° (2011)
Record low47° (1965)
Thu, 0380° / 62°0.08
80 °
Lewisburg, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high80°
Average low62°
Average precipitation0.08 in
Chance of precipitation25%
Record high95° (2011)
Record low47° (1974)
Fri, 0479° / 61°0.07
79 °
Lewisburg, Friday, 4 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.07 in
Chance of precipitation27%
Record high94° (1999)
Record low47° (1997)
Sat, 0579° / 61°0.04
79 °
Lewisburg, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.04 in
Chance of precipitation20%
Record high93° (2007)
Record low47° (1974)
Sun, 0679° / 61°0.06
79 °
Lewisburg, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.06 in
Chance of precipitation27%
Record high92° (1990)
Record low47° (1962)
Mon, 0779° / 61°0.11
79 °
Lewisburg, Monday, 7 September
Climate normal for this date — 60-year average.
Average high79°
Average low61°
Average precipitation0.11 in
Chance of precipitation30%
Record high90° (2016)
Record low45° (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 Lewisburg, IN 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 Lewisburg, IN 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.