Monthly outlook for Munster, IN: average high 80.2°, average low 65°. That is 0.1° above the climate normal for August. Precipitation is expected on 4 days (about 0.7 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 9 August (87.5°), the coolest 22 August (57°).
80.2°/65°
Average high / low
+0.1°
Above normal
4 / 6
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
81.1°
80.2°
+0.5°
18 August – 27 August
78.7°
80.1°
-0.8°
28 August – 6 September
at normal
78.6°
—
August records over 66 years
98.1°24 August 2023All-time high
49.3°29 August 1965All-time low
Climate normals and records are computed from the nearest reference point — Calumet Park (11 mi).
Sun, 0987° / 65°0.11
87 °
Munster, Sunday, 9 August
Rain. High 87°, low 65°.
Pressure29.97 inHg
Wind11.9 mph S
Humidity65%
Visibility6.2 mi
Dew point72°
Mon, 1087° / 72°0.38
87 °
Munster, Monday, 10 August
Rain. High 87°, low 72°.
Pressure29.91 inHg
Wind2.6 mph SW
Humidity63%
Visibility6.2 mi
Dew point72°
Tue, 1184° / 73°0.12
84 °
Munster, Tuesday, 11 August
Rain. High 84°, low 73°.
Pressure29.80 inHg
Wind9.8 mph SW
Humidity84%
Visibility6.2 mi
Dew point72°
Wed, 1284° / 69°0
84 °
Munster, Wednesday, 12 August
Light rain. High 84°, low 69°.
Pressure29.85 inHg
Wind5.3 mph N
Humidity57%
Visibility6.2 mi
Dew point65°
Thu, 1376° / 64°0
76 °
Munster, Thursday, 13 August
Overcast. High 76°, low 64°.
Pressure30.00 inHg
Wind6.3 mph NE
Humidity51%
Visibility—
Dew point55°
Fri, 1479° / 61°0
79 °
Munster, Friday, 14 August
Clear. High 79°, low 61°.
Pressure30.09 inHg
Wind8.6 mph NE
Humidity41%
Visibility—
Dew point51°
Sat, 1572° / 63°0.01
72 °
Munster, Saturday, 15 August
Light rain. High 72°, low 63°.
Pressure30.27 inHg
Wind6 mph SW
Humidity57%
Visibility—
Dew point53°
Sun, 1677° / 65°0
77 °
Munster, Sunday, 16 August
Overcast. High 77°, low 65°.
Pressure30.12 inHg
Wind4.4 mph SE
Humidity54%
Visibility—
Dew point56°
Mon, 1783° / 66°0
83 °
Munster, Monday, 17 August
Overcast. High 83°, low 66°.
Pressure30.03 inHg
Wind4 mph W
Humidity52%
Visibility—
Dew point60°
Tue, 1885° / 67°0
85 °
Munster, Tuesday, 18 August
Overcast. High 85°, low 67°.
Pressure29.97 inHg
Wind9.6 mph SW
Humidity53%
Visibility—
Dew point63°
Wed, 1980° / 68°0.06
80 °
Munster, Wednesday, 19 August
Light rain. High 80°, low 68°.
Pressure29.88 inHg
Wind11.2 mph N
Humidity40%
Visibility—
Dew point53°
Thu, 2070° / 60°0
70 °
Munster, Thursday, 20 August
Light rain. High 70°, low 60°.
Pressure30.06 inHg
Wind11.3 mph N
Humidity55%
Visibility—
Dew point52°
Fri, 2176° / 58°0
76 °
Munster, Friday, 21 August
Clear. High 76°, low 58°.
Pressure30.06 inHg
Wind8.6 mph NE
Humidity43%
Visibility—
Dew point50°
Sat, 2274° / 57°0.01
74 °
Munster, Saturday, 22 August
Light rain. High 74°, low 57°.
Pressure29.88 inHg
Wind10.5 mph S
Humidity65%
Visibility—
Dew point56°
Sun, 2387° / 65°0
87 °
Munster, Sunday, 23 August
Clear. High 87°, low 65°.
Pressure29.88 inHg
Wind13.5 mph W
Humidity39%
Visibility—
Dew point56°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2480° / 66°0.14
80 °
Munster, Monday, 24 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.14 in
Chance of precipitation28%
Record high98° (2023)
Record low57° (1966)
Tue, 2580° / 66°0.07
80 °
Munster, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.07 in
Chance of precipitation27%
Record high92° (2021)
Record low53° (2017)
Wed, 2681° / 67°0.17
81 °
Munster, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.17 in
Chance of precipitation35%
Record high94° (2024)
Record low54° (2025)
Thu, 2781° / 67°0.14
81 °
Munster, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high81°
Average low67°
Average precipitation0.14 in
Chance of precipitation37%
Record high96° (2024)
Record low54° (2025)
Fri, 2880° / 67°0.15
80 °
Munster, Friday, 28 August
Climate normal for this date — 60-year average.
Average high80°
Average low67°
Average precipitation0.15 in
Chance of precipitation37%
Record high92° (1984)
Record low51° (1986)
Sat, 2980° / 66°0.1
80 °
Munster, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high80°
Average low66°
Average precipitation0.1 in
Chance of precipitation28%
Record high93° (1984)
Record low49° (1965)
Sun, 3079° / 66°0.09
79 °
Munster, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high79°
Average low66°
Average precipitation0.09 in
Chance of precipitation30%
Record high92° (2013)
Record low54° (1986)
Mon, 3179° / 65°0.06
79 °
Munster, Monday, 31 August
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.06 in
Chance of precipitation23%
Record high89° (2012)
Record low55° (2023)
Tue, 0179° / 65°0.13
79 °
Munster, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.13 in
Chance of precipitation30%
Record high94° (2011)
Record low54° (1967)
Wed, 0279° / 65°0.06
79 °
Munster, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.06 in
Chance of precipitation27%
Record high92° (2011)
Record low52° (1965)
Thu, 0379° / 65°0.07
79 °
Munster, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high79°
Average low65°
Average precipitation0.07 in
Chance of precipitation23%
Record high93° (2023)
Record low53° (1974)
Fri, 0478° / 64°0.09
78 °
Munster, Friday, 4 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.09 in
Chance of precipitation33%
Record high91° (2023)
Record low50° (2025)
Sat, 0578° / 64°0.07
78 °
Munster, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high78°
Average low64°
Average precipitation0.07 in
Chance of precipitation27%
Record high90° (2023)
Record low53° (2010)
Sun, 0677° / 64°0.1
77 °
Munster, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high77°
Average low64°
Average precipitation0.1 in
Chance of precipitation37%
Record high91° (1990)
Record low49° (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 Munster, 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 Munster, 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.