Monthly outlook for St. Ignace, MI: average high 56.3°, average low 46.5°. That is 2.7° above the climate normal for October. Precipitation is expected on 5 days (about 0.7 inches), against a normal of 7 days and 1.8 inches. The warmest day looks like 10 October (73.6°), the coolest 23 October (36.7°).
56.3°/46.5°
Average high / low
+2.7°
Above normal
5 / 7
Wet days / normal
0.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
9 October – 18 October
59.1°
52.7°
+3.6°
19 October – 28 October
51.7°
48.7°
+1.6°
29 October – 7 November
at normal
45.4°
—
October records over 66 years
74.1°8 October 2007All-time high
23.9°30 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Mackinac Island (5 mi).
Sat, 1074° / 51°0
74 °
St. Ignace, Saturday, 10 October
Clear. High 74°, low 51°.
Pressure30.12 inHg
Wind9.9 mph E
Humidity73%
Visibility6.2 mi
Dew point54°
Sun, 1167° / 61°0
67 °
St. Ignace, Sunday, 11 October
Overcast. High 67°, low 61°.
Pressure30.00 inHg
Wind9.4 mph SW
Humidity66%
Visibility6.2 mi
Dew point55°
Mon, 1264° / 55°0.01
64 °
St. Ignace, Monday, 12 October
Light rain. High 64°, low 55°.
Pressure29.74 inHg
Wind14.3 mph SW
Humidity88%
Visibility6.2 mi
Dew point61°
Tue, 1355° / 49°0.15
55 °
St. Ignace, Tuesday, 13 October
Light rain. High 55°, low 49°.
Pressure29.88 inHg
Wind11.8 mph NE
Humidity69%
Visibility—
Dew point43°
Wed, 1454° / 47°0
54 °
St. Ignace, Wednesday, 14 October
Overcast. High 54°, low 47°.
Pressure30.18 inHg
Wind9.3 mph NE
Humidity56%
Visibility—
Dew point37°
Thu, 1555° / 47°0.36
55 °
St. Ignace, Thursday, 15 October
Rain. High 55°, low 47°.
Pressure30.00 inHg
Wind21.3 mph SE
Humidity88%
Visibility—
Dew point47°
Fri, 1663° / 47°0.07
63 °
St. Ignace, Friday, 16 October
Light rain. High 63°, low 47°.
Pressure29.83 inHg
Wind21.8 mph SW
Humidity76%
Visibility—
Dew point48°
Sat, 1746° / 40°0.05
46 °
St. Ignace, Saturday, 17 October
Light rain. High 46°, low 40°.
Pressure30.33 inHg
Wind15.4 mph NW
Humidity57%
Visibility—
Dew point31°
Sun, 1852° / 39°0
52 °
St. Ignace, Sunday, 18 October
Partly cloudy. High 52°, low 39°.
Pressure30.39 inHg
Wind20.2 mph SW
Humidity52%
Visibility—
Dew point33°
Mon, 1953° / 45°0
53 °
St. Ignace, Monday, 19 October
Clear. High 53°, low 45°.
Pressure30.50 inHg
Wind12.1 mph NW
Humidity47%
Visibility—
Dew point31°
Tue, 2053° / 44°0
53 °
St. Ignace, Tuesday, 20 October
Overcast. High 53°, low 44°.
Pressure30.36 inHg
Wind9.1 mph S
Humidity52%
Visibility—
Dew point34°
Wed, 2155° / 50°0.08
55 °
St. Ignace, Wednesday, 21 October
Light rain. High 55°, low 50°.
Pressure30.00 inHg
Wind17.1 mph W
Humidity84%
Visibility—
Dew point48°
Thu, 2252° / 44°0
52 °
St. Ignace, Thursday, 22 October
Overcast. High 52°, low 44°.
Pressure30.21 inHg
Wind14 mph NW
Humidity58%
Visibility—
Dew point37°
Fri, 2342° / 37°0
42 °
St. Ignace, Friday, 23 October
Clear. High 42°, low 37°.
Pressure30.39 inHg
Wind10.4 mph N
Humidity51%
Visibility—
Dew point24°
Sat, 2456° / 41°0
56 °
St. Ignace, Saturday, 24 October
Overcast. High 56°, low 41°.
Pressure29.97 inHg
Wind22.9 mph SW
Humidity61%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 2549° / 43°0.07
49 °
St. Ignace, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high49°
Average low43°
Average precipitation0.07 in
Chance of precipitation33%
Record high65° (1963)
Record low33° (1962)
Mon, 2648° / 43°0.09
48 °
St. Ignace, Monday, 26 October
Climate normal for this date — 60-year average.
Average high48°
Average low43°
Average precipitation0.09 in
Chance of precipitation37%
Record high63° (2000)
Record low29° (1976)
Tue, 2748° / 42°0.11
48 °
St. Ignace, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high48°
Average low42°
Average precipitation0.11 in
Chance of precipitation43%
Record high62° (1971)
Record low29° (1976)
Wed, 2847° / 41°0.07
47 °
St. Ignace, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high47°
Average low41°
Average precipitation0.07 in
Chance of precipitation37%
Record high59° (1984)
Record low29° (1965)
Thu, 2946° / 41°0.05
46 °
St. Ignace, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high46°
Average low41°
Average precipitation0.05 in
Chance of precipitation25%
Record high61° (2024)
Record low31° (2020)
Fri, 3047° / 41°0.09
47 °
St. Ignace, Friday, 30 October
Climate normal for this date — 60-year average.
Average high47°
Average low41°
Average precipitation0.09 in
Chance of precipitation30%
Record high61° (2024)
Record low24° (2020)
Sat, 3147° / 41°0.1
47 °
St. Ignace, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high47°
Average low41°
Average precipitation0.1 in
Chance of precipitation47%
Record high59° (1971)
Record low31° (2023)
Sun, 0146° / 41°0.14
46 °
St. Ignace, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high46°
Average low41°
Average precipitation0.14 in
Chance of precipitation47%
Record high56° (1999)
Record low29° (2023)
Mon, 0246° / 40°0.17
46 °
St. Ignace, Monday, 2 November
Climate normal for this date — 60-year average.
Average high46°
Average low40°
Average precipitation0.17 in
Chance of precipitation38%
Record high58° (1961)
Record low27° (1966)
Tue, 0345° / 39°0.08
45 °
St. Ignace, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high45°
Average low39°
Average precipitation0.08 in
Chance of precipitation37%
Record high59° (1961)
Record low27° (1989)
Wed, 0444° / 39°0.1
44 °
St. Ignace, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high44°
Average low39°
Average precipitation0.1 in
Chance of precipitation40%
Record high55° (2008)
Record low29° (1991)
Thu, 0544° / 39°0.15
44 °
St. Ignace, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high44°
Average low39°
Average precipitation0.15 in
Chance of precipitation42%
Record high57° (2015)
Record low27° (1962)
Fri, 0644° / 38°0.11
44 °
St. Ignace, Friday, 6 November
Climate normal for this date — 60-year average.
Average high44°
Average low38°
Average precipitation0.11 in
Chance of precipitation37%
Record high56° (2015)
Record low23° (1991)
Sat, 0743° / 38°0.06
43 °
St. Ignace, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high43°
Average low38°
Average precipitation0.06 in
Chance of precipitation32%
Record high56° (2016)
Record low22° (1991)
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. Ignace, 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. Ignace, 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.