Monthly outlook for St. Helen, MI: average high 77.6°, average low 56.4°. That is 1.1° above the climate normal for August. Precipitation is expected on 5 days (about 0.7 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 17 August (85.1°), the coolest 21 August (49.1°).
77.6°/56.4°
Average high / low
+1.1°
Above normal
5 / 5
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 August – 17 August
78.7°
76°
+1.5°
18 August – 27 August
75.7°
75.2°
+0.3°
28 August – 6 September
at normal
73.5°
—
August records over 66 years
93.9°8 August 2001All-time high
41.9°29 August 1982All-time low
Climate normals and records are computed from the nearest reference point — Prudenville (13 mi).
Sun, 0981° / 63°0.11
81 °
St. Helen, Sunday, 9 August
Rain. High 81°, low 63°.
Pressure29.94 inHg
Wind8.2 mph S
Humidity38%
Visibility6.2 mi
Dew point52°
Mon, 1084° / 65°0
84 °
St. Helen, Monday, 10 August
Partly cloudy. High 84°, low 65°.
Pressure29.88 inHg
Wind8.6 mph NW
Humidity56%
Visibility6.2 mi
Dew point61°
Tue, 1176° / 60°0
76 °
St. Helen, Tuesday, 11 August
Light rain. High 76°, low 60°.
Pressure29.85 inHg
Wind8.9 mph SE
Humidity49%
Visibility6.2 mi
Dew point55°
Wed, 1281° / 58°0
81 °
St. Helen, Wednesday, 12 August
Clear. High 81°, low 58°.
Pressure29.77 inHg
Wind7.9 mph NW
Humidity41%
Visibility6.2 mi
Dew point53°
Thu, 1368° / 49°0
68 °
St. Helen, Thursday, 13 August
Overcast. High 68°, low 49°.
Pressure30.00 inHg
Wind9.8 mph NW
Humidity46%
Visibility—
Dew point43°
Fri, 1475° / 51°0
75 °
St. Helen, Friday, 14 August
Mostly clear. High 75°, low 51°.
Pressure30.03 inHg
Wind12.9 mph NW
Humidity32%
Visibility—
Dew point41°
Sat, 1575° / 50°0
75 °
St. Helen, Saturday, 15 August
Overcast. High 75°, low 50°.
Pressure30.27 inHg
Wind4.3 mph N
Humidity33%
Visibility—
Dew point42°
Sun, 1682° / 53°0
82 °
St. Helen, Sunday, 16 August
Partly cloudy. High 82°, low 53°.
Pressure30.12 inHg
Wind4.7 mph NW
Humidity30%
Visibility—
Dew point43°
Mon, 1785° / 61°0.01
85 °
St. Helen, Monday, 17 August
Light rain. High 85°, low 61°.
Pressure29.97 inHg
Wind7.6 mph NW
Humidity37%
Visibility—
Dew point52°
Tue, 1885° / 62°0.18
85 °
St. Helen, Tuesday, 18 August
Rain. High 85°, low 62°.
Pressure29.91 inHg
Wind11 mph SW
Humidity39%
Visibility—
Dew point55°
Wed, 1971° / 56°0.26
71 °
St. Helen, Wednesday, 19 August
Rain. High 71°, low 56°.
Pressure29.71 inHg
Wind16.6 mph NW
Humidity57%
Visibility—
Dew point54°
Thu, 2073° / 54°0
73 °
St. Helen, Thursday, 20 August
Overcast. High 73°, low 54°.
Pressure29.91 inHg
Wind14.3 mph NW
Humidity27%
Visibility—
Dew point35°
Fri, 2174° / 49°0
74 °
St. Helen, Friday, 21 August
Partly cloudy. High 74°, low 49°.
Pressure30.09 inHg
Wind6.6 mph N
Humidity34%
Visibility—
Dew point41°
Sat, 2273° / 52°0.02
73 °
St. Helen, Saturday, 22 August
Light rain. High 73°, low 52°.
Pressure29.97 inHg
Wind8.8 mph S
Humidity33%
Visibility—
Dew point40°
Sun, 2378° / 56°0.05
78 °
St. Helen, Sunday, 23 August
Light rain. High 78°, low 56°.
Pressure29.71 inHg
Wind15.5 mph W
Humidity36%
Visibility—
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2475° / 59°0.08
75 °
St. Helen, Monday, 24 August
Climate normal for this date — 60-year average.
Average high75°
Average low59°
Average precipitation0.08 in
Chance of precipitation28%
Record high89° (2021)
Record low47° (1971)
Tue, 2576° / 59°0.11
76 °
St. Helen, Tuesday, 25 August
Climate normal for this date — 60-year average.
Average high76°
Average low59°
Average precipitation0.11 in
Chance of precipitation23%
Record high88° (2021)
Record low47° (1977)
Wed, 2676° / 60°0.14
76 °
St. Helen, Wednesday, 26 August
Climate normal for this date — 60-year average.
Average high76°
Average low60°
Average precipitation0.14 in
Chance of precipitation42%
Record high89° (1991)
Record low49° (1963)
Thu, 2775° / 60°0.15
75 °
St. Helen, Thursday, 27 August
Climate normal for this date — 60-year average.
Average high75°
Average low60°
Average precipitation0.15 in
Chance of precipitation40%
Record high92° (1973)
Record low48° (1968)
Fri, 2874° / 59°0.09
74 °
St. Helen, Friday, 28 August
Climate normal for this date — 60-year average.
Average high74°
Average low59°
Average precipitation0.09 in
Chance of precipitation40%
Record high90° (1991)
Record low44° (1986)
Sat, 2974° / 59°0.12
74 °
St. Helen, Saturday, 29 August
Climate normal for this date — 60-year average.
Average high74°
Average low59°
Average precipitation0.12 in
Chance of precipitation40%
Record high89° (1984)
Record low42° (1982)
Sun, 3074° / 58°0.09
74 °
St. Helen, Sunday, 30 August
Climate normal for this date — 60-year average.
Average high74°
Average low58°
Average precipitation0.09 in
Chance of precipitation35%
Record high87° (1961)
Record low46° (1976)
Mon, 3174° / 57°0.05
74 °
St. Helen, Monday, 31 August
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.05 in
Chance of precipitation22%
Record high85° (1969)
Record low45° (2009)
Tue, 0174° / 57°0.06
74 °
St. Helen, Tuesday, 1 September
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.06 in
Chance of precipitation28%
Record high85° (2000)
Record low47° (1994)
Wed, 0274° / 57°0.09
74 °
St. Helen, Wednesday, 2 September
Climate normal for this date — 60-year average.
Average high74°
Average low57°
Average precipitation0.09 in
Chance of precipitation30%
Record high90° (2011)
Record low43° (1976)
Thu, 0373° / 58°0.13
73 °
St. Helen, Thursday, 3 September
Climate normal for this date — 60-year average.
Average high73°
Average low58°
Average precipitation0.13 in
Chance of precipitation27%
Record high85° (1973)
Record low44° (1974)
Fri, 0473° / 57°0.08
73 °
St. Helen, Friday, 4 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.08 in
Chance of precipitation30%
Record high88° (2023)
Record low44° (1974)
Sat, 0573° / 57°0.08
73 °
St. Helen, Saturday, 5 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.08 in
Chance of precipitation23%
Record high87° (2023)
Record low45° (1984)
Sun, 0673° / 57°0.09
73 °
St. Helen, Sunday, 6 September
Climate normal for this date — 60-year average.
Average high73°
Average low57°
Average precipitation0.09 in
Chance of precipitation33%
Record high86° (1960)
Record low44° (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 St. Helen, 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 St. Helen, 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.