Monthly outlook for Long Lake Island, IN: average high 81.3°, average low 65.9°. That is 0.8° above the climate normal for August. Precipitation is expected on 6 days (about 3.9 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 10 August (88.9°), the coolest 23 August (58.9°).
81.3°/65.9°
Average high / low
+0.8°
Above normal
6 / 6
Wet days / normal
3.9 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 August – 18 August
82.2°
79.9°
+1.3°
19 August – 28 August
79.8°
80°
-0.1°
29 August – 7 September
at normal
78.4°
—
August records over 66 years
95.4°16 August 1988All-time high
47.5°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Salt Creek Commons (5 mi).
Mon, 1089° / 72°1.12
89 °
Long Lake Island, Monday, 10 August
Heavy rain. High 89°, low 72°.
Pressure29.88 inHg
Wind4.8 mph W
Humidity74%
Visibility6.2 mi
Dew point75°
Tue, 1185° / 69°1.07
85 °
Long Lake Island, Tuesday, 11 August
Heavy rain. High 85°, low 69°.
Pressure29.83 inHg
Wind16.9 mph SW
Humidity70%
Visibility6.2 mi
Dew point74°
Wed, 1278° / 66°0
78 °
Long Lake Island, Wednesday, 12 August
Overcast. High 78°, low 66°.
Pressure29.88 inHg
Wind8.1 mph N
Humidity73%
Visibility6.2 mi
Dew point69°
Thu, 1379° / 61°0.03
79 °
Long Lake Island, Thursday, 13 August
Light rain. High 79°, low 61°.
Pressure29.97 inHg
Wind10.3 mph SE
Humidity65%
Visibility6.2 mi
Dew point64°
Fri, 1478° / 68°0.11
78 °
Long Lake Island, Friday, 14 August
Light rain. High 78°, low 68°.
Pressure30.03 inHg
Wind10.1 mph SE
Humidity87%
Visibility—
Dew point70°
Sat, 1587° / 69°0.28
87 °
Long Lake Island, Saturday, 15 August
Rain. High 87°, low 69°.
Pressure29.94 inHg
Wind14.2 mph SE
Humidity78%
Visibility—
Dew point72°
Sun, 1682° / 65°0.02
82 °
Long Lake Island, Sunday, 16 August
Light rain. High 82°, low 65°.
Pressure29.97 inHg
Wind19.1 mph SW
Humidity82%
Visibility—
Dew point66°
Mon, 1776° / 62°0
76 °
Long Lake Island, Monday, 17 August
Overcast. High 76°, low 62°.
Pressure30.03 inHg
Wind12.6 mph SE
Humidity83%
Visibility—
Dew point65°
Tue, 1886° / 70°0
86 °
Long Lake Island, Tuesday, 18 August
Overcast. High 86°, low 70°.
Pressure29.85 inHg
Wind13.7 mph S
Humidity68%
Visibility—
Dew point71°
Wed, 1984° / 69°0
84 °
Long Lake Island, Wednesday, 19 August
Overcast. High 84°, low 69°.
Pressure30.03 inHg
Wind7.1 mph NW
Humidity63%
Visibility—
Dew point66°
Thu, 2082° / 69°0.5
82 °
Long Lake Island, Thursday, 20 August
Rain. High 82°, low 69°.
Pressure29.85 inHg
Wind11.8 mph SE
Humidity78%
Visibility—
Dew point71°
Fri, 2176° / 68°0.75
76 °
Long Lake Island, Friday, 21 August
Heavy rain. High 76°, low 68°.
Pressure29.88 inHg
Wind14.2 mph N
Humidity82%
Visibility—
Dew point69°
Sat, 2274° / 60°0
74 °
Long Lake Island, Saturday, 22 August
Clear. High 74°, low 60°.
Pressure30.03 inHg
Wind7.9 mph NE
Humidity61%
Visibility—
Dew point58°
Sun, 2379° / 59°0
79 °
Long Lake Island, Sunday, 23 August
Partly cloudy. High 79°, low 59°.
Pressure30.00 inHg
Wind6 mph SW
Humidity61%
Visibility—
Dew point61°
Mon, 2485° / 66°0.02
85 °
Long Lake Island, Monday, 24 August
Light rain. High 85°, low 66°.
Pressure30.00 inHg
Wind7.7 mph N
Humidity65%
Visibility—
Dew point67°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2580° / 65°0.11
80 °
Long Lake Island, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.11 in
Chance of precipitation32%
Record high92° (2012)
Record low50° (2017)
Wed, 2681° / 66°0.15
81 °
Long Lake Island, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low66°
Average precipitation0.15 in
Chance of precipitation33%
Record high93° (2024)
Record low53° (2025)
Thu, 2781° / 66°0.13
81 °
Long Lake Island, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low66°
Average precipitation0.13 in
Chance of precipitation33%
Record high95° (2024)
Record low50° (2025)
Fri, 2880° / 66°0.15
80 °
Long Lake Island, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.15 in
Chance of precipitation38%
Record high91° (1991)
Record low50° (1986)
Sat, 2980° / 65°0.09
80 °
Long Lake Island, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low65°
Average precipitation0.09 in
Chance of precipitation35%
Record high91° (1984)
Record low47° (1965)
Sun, 3079° / 64°0.09
79 °
Long Lake Island, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.09 in
Chance of precipitation28%
Record high92° (1995)
Record low51° (1986)
Mon, 3179° / 64°0.06
79 °
Long Lake Island, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.06 in
Chance of precipitation25%
Record high91° (2012)
Record low51° (2025)
Tue, 0179° / 63°0.15
79 °
Long Lake Island, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low63°
Average precipitation0.15 in
Chance of precipitation28%
Record high94° (2011)
Record low49° (1967)
Wed, 0279° / 64°0.07
79 °
Long Lake Island, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.07 in
Chance of precipitation27%
Record high93° (2011)
Record low47° (2017)
Thu, 0379° / 64°0.07
79 °
Long Lake Island, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low64°
Average precipitation0.07 in
Chance of precipitation28%
Record high90° (1964)
Record low52° (1974)
Fri, 0478° / 63°0.09
78 °
Long Lake Island, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low63°
Average precipitation0.09 in
Chance of precipitation30%
Record high90° (1999)
Record low51° (1997)
Sat, 0578° / 62°0.08
78 °
Long Lake Island, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.08 in
Chance of precipitation28%
Record high91° (1999)
Record low51° (1997)
Sun, 0677° / 63°0.09
77 °
Long Lake Island, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low63°
Average precipitation0.09 in
Chance of precipitation35%
Record high91° (1990)
Record low48° (2025)
Mon, 0778° / 62°0.1
78 °
Long Lake Island, Monday, 7 September
Climate normal for this date — 60-year average.
Average high78°
Average low62°
Average precipitation0.1 in
Chance of precipitation38%
Record high91° (1960)
Record low46° (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 Long Lake Island, 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 Long Lake Island, 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.