Monthly outlook for Posen, MI: average high 75.3°, average low 56.9°. That is 0.9° above the climate normal for August. Precipitation is expected on 5 days (about 0.6 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 18 August (87.5°), the coolest 14 August (49.3°).
75.3°/56.9°
Average high / low
+0.9°
Above normal
5 / 6
Wet days / normal
0.6 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
75.7°
74.2°
+0.8°
18 August – 27 August
74.6°
73.1°
+0.8°
28 August – 6 September
at normal
71.9°
—
August records over 66 years
91.6°2 August 1988All-time high
47.8°27 August 2025All-time low
Climate normals and records are computed from the nearest reference point — Rogers City (12 mi).
Sun, 0981° / 62°0
81 °
Posen, Sunday, 9 August
Light rain. High 81°, low 62°.
Pressure29.94 inHg
Wind6.9 mph SW
Humidity40%
Visibility6.2 mi
Dew point54°
Mon, 1079° / 62°0.04
79 °
Posen, Monday, 10 August
Light rain. High 79°, low 62°.
Pressure29.88 inHg
Wind8.3 mph NW
Humidity81%
Visibility6.2 mi
Dew point66°
Tue, 1173° / 56°0
73 °
Posen, Tuesday, 11 August
Overcast. High 73°, low 56°.
Pressure29.88 inHg
Wind6.9 mph E
Humidity50%
Visibility6.2 mi
Dew point53°
Wed, 1272° / 59°0.01
72 °
Posen, Wednesday, 12 August
Light rain. High 72°, low 59°.
Pressure29.77 inHg
Wind3.9 mph W
Humidity45%
Visibility6.2 mi
Dew point52°
Thu, 1367° / 53°0.01
67 °
Posen, Thursday, 13 August
Light rain. High 67°, low 53°.
Pressure29.97 inHg
Wind12.4 mph NW
Humidity51%
Visibility—
Dew point47°
Fri, 1471° / 49°0.01
71 °
Posen, Friday, 14 August
Light rain. High 71°, low 49°.
Pressure30.06 inHg
Wind10.5 mph N
Humidity56%
Visibility—
Dew point50°
Sat, 1574° / 53°0
74 °
Posen, Saturday, 15 August
Overcast. High 74°, low 53°.
Pressure30.27 inHg
Wind7.7 mph E
Humidity46%
Visibility—
Dew point49°
Sun, 1680° / 52°0
80 °
Posen, Sunday, 16 August
Clear. High 80°, low 52°.
Pressure30.09 inHg
Wind5.8 mph S
Humidity34%
Visibility—
Dew point45°
Mon, 1783° / 60°0.01
83 °
Posen, Monday, 17 August
Light rain. High 83°, low 60°.
Pressure29.94 inHg
Wind7.3 mph W
Humidity42%
Visibility—
Dew point55°
Tue, 1887° / 57°0.15
87 °
Posen, Tuesday, 18 August
Light rain. High 87°, low 57°.
Pressure29.88 inHg
Wind10.8 mph SW
Humidity40%
Visibility—
Dew point55°
Wed, 1966° / 59°0.17
66 °
Posen, Wednesday, 19 August
Light rain. High 66°, low 59°.
Pressure29.68 inHg
Wind17.4 mph W
Humidity81%
Visibility—
Dew point60°
Thu, 2069° / 59°0
69 °
Posen, Thursday, 20 August
Light rain. High 69°, low 59°.
Pressure29.91 inHg
Wind18 mph NW
Humidity34%
Visibility—
Dew point38°
Fri, 2173° / 53°0
73 °
Posen, Friday, 21 August
Clear. High 73°, low 53°.
Pressure30.09 inHg
Wind9.8 mph N
Humidity42%
Visibility—
Dew point45°
Sat, 2274° / 51°0
74 °
Posen, Saturday, 22 August
Overcast. High 74°, low 51°.
Pressure29.97 inHg
Wind9 mph SE
Humidity39%
Visibility—
Dew point45°
Sun, 2378° / 58°0.17
78 °
Posen, Sunday, 23 August
Light rain. High 78°, low 58°.
Pressure29.68 inHg
Wind18.6 mph W
Humidity42%
Visibility—
Dew point50°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2473° / 62°0.08
73 °
Posen, Monday, 24 August
Climate normal for this date — 60-year average.
Average high73°
Average low62°
Average precipitation0.08 in
Chance of precipitation33%
Record high86° (1968)
Record low50° (1971)
Tue, 2574° / 62°0.09
74 °
Posen, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high74°
Average low62°
Average precipitation0.09 in
Chance of precipitation32%
Record high87° (2013)
Record low51° (2019)
Wed, 2674° / 63°0.15
74 °
Posen, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high74°
Average low63°
Average precipitation0.15 in
Chance of precipitation40%
Record high90° (2024)
Record low49° (2017)
Thu, 2773° / 63°0.15
73 °
Posen, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.15 in
Chance of precipitation47%
Record high87° (1991)
Record low48° (2025)
Fri, 2873° / 63°0.11
73 °
Posen, Friday, 28 August
Climate normal for this date — 60-year average.
Average high73°
Average low63°
Average precipitation0.11 in
Chance of precipitation40%
Record high85° (2021)
Record low49° (1965)
Sat, 2972° / 62°0.13
72 °
Posen, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.13 in
Chance of precipitation45%
Record high87° (2021)
Record low48° (1982)
Sun, 3072° / 62°0.11
72 °
Posen, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high72°
Average low62°
Average precipitation0.11 in
Chance of precipitation38%
Record high88° (2012)
Record low49° (2025)
Mon, 3172° / 60°0.06
72 °
Posen, Monday, 31 August
Climate normal for this date — 60-year average.
Average high72°
Average low60°
Average precipitation0.06 in
Chance of precipitation20%
Record high85° (2010)
Record low51° (2019)
Tue, 0173° / 61°0.07
73 °
Posen, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high73°
Average low61°
Average precipitation0.07 in
Chance of precipitation27%
Record high83° (1973)
Record low51° (2017)
Wed, 0272° / 61°0.09
72 °
Posen, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high72°
Average low61°
Average precipitation0.09 in
Chance of precipitation37%
Record high87° (2011)
Record low45° (2017)
Thu, 0372° / 61°0.13
72 °
Posen, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high72°
Average low61°
Average precipitation0.13 in
Chance of precipitation40%
Record high86° (1983)
Record low51° (2017)
Fri, 0471° / 60°0.1
71 °
Posen, Friday, 4 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.1 in
Chance of precipitation35%
Record high86° (2023)
Record low46° (2025)
Sat, 0571° / 60°0.11
71 °
Posen, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.11 in
Chance of precipitation40%
Record high91° (2023)
Record low48° (2019)
Sun, 0671° / 60°0.09
71 °
Posen, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high71°
Average low60°
Average precipitation0.09 in
Chance of precipitation35%
Record high86° (1960)
Record low47° (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 Posen, MI 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 Posen, MI 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.