Monthly outlook for Key West, MN: average high 81.7°, average low 58.4°. That is 2.3° above the climate normal for August. Precipitation is expected on 2 days (about 0.4 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 17 August (92.3°), the coolest 19 August (52.9°).
81.7°/58.4°
Average high / low
+2.3°
Above normal
2 / 5
Wet days / normal
0.4 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
82.6°
77.8°
+2.7°
18 August – 27 August
80.1°
77.1°
+1.7°
28 August – 6 September
at normal
74.6°
—
August records over 66 years
97.5°19 August 1976All-time high
39.9°28 August 1986All-time low
Climate normals and records are computed from the nearest reference point — Fisher (9 mi).
Sun, 0979° / 55°0
79 °
Key West, Sunday, 9 August
Partly cloudy. High 79°, low 55°.
Pressure29.91 inHg
Wind9 mph N
Humidity33%
Visibility6.2 mi
Dew point46°
Mon, 1082° / 58°0
82 °
Key West, Monday, 10 August
Overcast. High 82°, low 58°.
Pressure29.94 inHg
Wind8.6 mph NE
Humidity30%
Visibility6.2 mi
Dew point44°
Tue, 1185° / 59°0
85 °
Key West, Tuesday, 11 August
Clear. High 85°, low 59°.
Pressure29.91 inHg
Wind11.7 mph N
Humidity25%
Visibility6.2 mi
Dew point42°
Wed, 1282° / 62°0
82 °
Key West, Wednesday, 12 August
Overcast. High 82°, low 62°.
Pressure30.03 inHg
Wind9.1 mph N
Humidity31%
Visibility6.2 mi
Dew point44°
Thu, 1381° / 55°0
81 °
Key West, Thursday, 13 August
Mostly clear. High 81°, low 55°.
Pressure30.06 inHg
Wind9.9 mph NE
Humidity26%
Visibility—
Dew point37°
Fri, 1488° / 56°0
88 °
Key West, Friday, 14 August
Partly cloudy. High 88°, low 56°.
Pressure30.12 inHg
Wind12.8 mph SE
Humidity19%
Visibility—
Dew point34°
Sat, 1573° / 66°0
73 °
Key West, Saturday, 15 August
Overcast. High 73°, low 66°.
Pressure30.12 inHg
Wind14.9 mph S
Humidity70%
Visibility—
Dew point59°
Sun, 1681° / 57°0
81 °
Key West, Sunday, 16 August
Overcast. High 81°, low 57°.
Pressure30.09 inHg
Wind9.2 mph W
Humidity32%
Visibility—
Dew point42°
Mon, 1792° / 59°0.06
92 °
Key West, Monday, 17 August
Light rain. High 92°, low 59°.
Pressure29.91 inHg
Wind14.3 mph S
Humidity21%
Visibility—
Dew point39°
Tue, 1876° / 62°0
76 °
Key West, Tuesday, 18 August
Mostly clear. High 76°, low 62°.
Pressure29.94 inHg
Wind20.3 mph N
Humidity40%
Visibility—
Dew point48°
Wed, 1981° / 53°0
81 °
Key West, Wednesday, 19 August
Clear. High 81°, low 53°.
Pressure30.12 inHg
Wind12.9 mph N
Humidity25%
Visibility—
Dew point35°
Thu, 2085° / 56°0
85 °
Key West, Thursday, 20 August
Mostly clear. High 85°, low 56°.
Pressure30.03 inHg
Wind11.4 mph E
Humidity18%
Visibility—
Dew point31°
Fri, 2185° / 61°0
85 °
Key West, Friday, 21 August
Overcast. High 85°, low 61°.
Pressure29.85 inHg
Wind20.6 mph S
Humidity27%
Visibility—
Dew point42°
Sat, 2275° / 62°0.34
75 °
Key West, Saturday, 22 August
Rain. High 75°, low 62°.
Pressure29.59 inHg
Wind20.8 mph S
Humidity42%
Visibility—
Dew point48°
Sun, 2378° / 60°0
78 °
Key West, Sunday, 23 August
Partly cloudy. High 78°, low 60°.
Pressure29.94 inHg
Wind18 mph NW
Humidity37%
Visibility—
Dew point44°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2478° / 61°0.11
78 °
Key West, Monday, 24 August
Climate normal for this date — 60-year average.
Average high78°
Average low61°
Average precipitation0.11 in
Chance of precipitation33%
Record high95° (1976)
Record low49° (1977)
Tue, 2577° / 61°0.09
77 °
Key West, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high77°
Average low61°
Average precipitation0.09 in
Chance of precipitation30%
Record high94° (2013)
Record low46° (2025)
Wed, 2677° / 59°0.07
77 °
Key West, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high77°
Average low59°
Average precipitation0.07 in
Chance of precipitation30%
Record high91° (1984)
Record low43° (1992)
Thu, 2776° / 58°0.08
76 °
Key West, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high76°
Average low58°
Average precipitation0.08 in
Chance of precipitation38%
Record high95° (1984)
Record low42° (1982)
Fri, 2876° / 59°0.11
76 °
Key West, Friday, 28 August
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.11 in
Chance of precipitation35%
Record high96° (1984)
Record low40° (1986)
Sat, 2976° / 60°0.1
76 °
Key West, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.1 in
Chance of precipitation32%
Record high93° (2012)
Record low47° (1974)
Sun, 3075° / 58°0.1
75 °
Key West, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high75°
Average low58°
Average precipitation0.1 in
Chance of precipitation33%
Record high92° (1961)
Record low46° (1978)
Mon, 3176° / 59°0.11
76 °
Key West, Monday, 31 August
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.11 in
Chance of precipitation33%
Record high89° (2008)
Record low45° (1987)
Tue, 0174° / 58°0.13
74 °
Key West, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.13 in
Chance of precipitation35%
Record high89° (1983)
Record low41° (1974)
Wed, 0274° / 58°0.12
74 °
Key West, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.12 in
Chance of precipitation28%
Record high95° (1983)
Record low39° (1974)
Thu, 0375° / 57°0.07
75 °
Key West, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high75°
Average low57°
Average precipitation0.07 in
Chance of precipitation17%
Record high89° (2023)
Record low41° (1974)
Fri, 0474° / 58°0.08
74 °
Key West, Friday, 4 September
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.08 in
Chance of precipitation22%
Record high95° (2023)
Record low40° (2025)
Sat, 0573° / 57°0.1
73 °
Key West, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.1 in
Chance of precipitation27%
Record high92° (1978)
Record low41° (1965)
Sun, 0673° / 56°0.12
73 °
Key West, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high73°
Average low56°
Average precipitation0.12 in
Chance of precipitation33%
Record high91° (1976)
Record low39° (1968)
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 Key West, MN 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 Key West, MN 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.