Monthly outlook for St. Ignace, MI: average high 58.2°, average low 49.5°. That is 3.6° above the climate normal for October. Precipitation is expected on 4 days (about 1.3 inches), against a normal of 7 days and 1.8 inches. The warmest day looks like 10 October (71.3°), the coolest 21 October (38.9°).
58.2°/49.5°
Average high / low
+3.6°
Above normal
4 / 7
Wet days / normal
1.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
61.1°
53.1°
+4.5°
18 October – 27 October
53.3°
49.1°
+2.4°
28 October – 6 November
at normal
45.8°
—
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).
Fri, 0959° / 49°0
59 °
St. Ignace, Friday, 9 October
Partly cloudy. High 59°, low 49°.
Pressure30.15 inHg
Wind8.2 mph NW
Humidity50%
Visibility6.2 mi
Dew point38°
Sat, 1071° / 52°0
71 °
St. Ignace, Saturday, 10 October
Clear. High 71°, low 52°.
Pressure30.12 inHg
Wind11.5 mph SE
Humidity74%
Visibility6.2 mi
Dew point53°
Sun, 1168° / 62°0
68 °
St. Ignace, Sunday, 11 October
Clear. High 68°, low 62°.
Pressure30.00 inHg
Wind14.7 mph SW
Humidity64%
Visibility6.2 mi
Dew point54°
Mon, 1263° / 59°0.01
63 °
St. Ignace, Monday, 12 October
Light rain. High 63°, low 59°.
Pressure29.74 inHg
Wind16 mph SW
Humidity85%
Visibility—
Dew point58°
Tue, 1358° / 47°0.06
58 °
St. Ignace, Tuesday, 13 October
Light rain. High 58°, low 47°.
Pressure29.85 inHg
Wind15.7 mph NW
Humidity68%
Visibility—
Dew point44°
Wed, 1452° / 43°0
52 °
St. Ignace, Wednesday, 14 October
Overcast. High 52°, low 43°.
Pressure30.15 inHg
Wind11.3 mph SE
Humidity56%
Visibility—
Dew point35°
Thu, 1561° / 47°0.87
61 °
St. Ignace, Thursday, 15 October
Heavy rain. High 61°, low 47°.
Pressure29.77 inHg
Wind14.6 mph SE
Humidity85%
Visibility—
Dew point52°
Fri, 1664° / 56°0.15
64 °
St. Ignace, Friday, 16 October
Light rain. High 64°, low 56°.
Pressure29.80 inHg
Wind15.5 mph SW
Humidity97%
Visibility—
Dew point62°
Sat, 1757° / 51°0.13
57 °
St. Ignace, Saturday, 17 October
Light rain. High 57°, low 51°.
Pressure29.97 inHg
Wind22 mph SW
Humidity72%
Visibility—
Dew point47°
Sun, 1850° / 48°0.04
50 °
St. Ignace, Sunday, 18 October
Light rain. High 50°, low 48°.
Pressure30.18 inHg
Wind17.5 mph W
Humidity66%
Visibility—
Dew point37°
Mon, 1954° / 49°0
54 °
St. Ignace, Monday, 19 October
Light rain. High 54°, low 49°.
Pressure30.21 inHg
Wind13.1 mph SW
Humidity62%
Visibility—
Dew point40°
Tue, 2053° / 44°0
53 °
St. Ignace, Tuesday, 20 October
Light rain. High 53°, low 44°.
Pressure30.06 inHg
Wind17.2 mph N
Humidity66%
Visibility—
Dew point40°
Wed, 2148° / 39°0
48 °
St. Ignace, Wednesday, 21 October
Light rain. High 48°, low 39°.
Pressure30.24 inHg
Wind11.5 mph N
Humidity52%
Visibility—
Dew point28°
Thu, 2258° / 42°0
58 °
St. Ignace, Thursday, 22 October
Clear. High 58°, low 42°.
Pressure29.77 inHg
Wind15 mph S
Humidity43%
Visibility—
Dew point33°
Fri, 2357° / 52°0
57 °
St. Ignace, Friday, 23 October
Overcast. High 57°, low 52°.
Pressure29.53 inHg
Wind14.9 mph S
Humidity75%
Visibility—
Dew point49°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2449° / 44°0.12
49 °
St. Ignace, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high49°
Average low44°
Average precipitation0.12 in
Chance of precipitation43%
Record high67° (1963)
Record low31° (1981)
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)
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.