Monthly outlook for Saint Johns, MT: average high 55.6°, average low 38.6°. That is 1.5° above the climate normal for October. Precipitation is expected on 1 day (about 0.2 inches), against a normal of 2 days and 0.4 inches. The warmest day looks like 17 October (71.5°), the coolest 25 October (33.7°).
55.6°/38.6°
Average high / low
+1.5°
Above normal
1 / 2
Wet days / normal
0.2 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
59.1°
55.2°
+2.2°
26 October – 4 November
49.8°
48.2°
+0.9°
5 November – 14 November
at normal
42.4°
—
October records over 66 years
86.4°7 October 1980All-time high
-16.2°29 October 1991All-time low
Climate normals and records are computed from the nearest reference point — Simpson (13 mi).
Sat, 1771° / 43°0
71 °
Saint Johns, Saturday, 17 October
Overcast. High 71°, low 43°.
Pressure29.83 inHg
Wind14.1 mph SW
Humidity34%
Visibility6.2 mi
Dew point35°
Sun, 1859° / 36°0
59 °
Saint Johns, Sunday, 18 October
Clear. High 59°, low 36°.
Pressure30.12 inHg
Wind8.4 mph SE
Humidity43%
Visibility6.2 mi
Dew point33°
Mon, 1960° / 38°0
60 °
Saint Johns, Monday, 19 October
Overcast. High 60°, low 38°.
Pressure29.88 inHg
Wind4.1 mph SE
Humidity50%
Visibility6.2 mi
Dew point33°
Tue, 2062° / 44°0
62 °
Saint Johns, Tuesday, 20 October
Overcast. High 62°, low 44°.
Pressure29.85 inHg
Wind11.5 mph NW
Humidity68%
Visibility—
Dew point43°
Wed, 2158° / 38°0.02
58 °
Saint Johns, Wednesday, 21 October
Light rain. High 58°, low 38°.
Pressure30.09 inHg
Wind7.7 mph NW
Humidity59%
Visibility—
Dew point36°
Thu, 2269° / 49°0
69 °
Saint Johns, Thursday, 22 October
Clear. High 69°, low 49°.
Pressure29.68 inHg
Wind13.3 mph SW
Humidity35%
Visibility—
Dew point34°
Fri, 2353° / 42°0.19
53 °
Saint Johns, Friday, 23 October
Rain. High 53°, low 42°.
Pressure29.94 inHg
Wind25.1 mph N
Humidity57%
Visibility—
Dew point31°
Sat, 2446° / 35°0
46 °
Saint Johns, Saturday, 24 October
Overcast. High 46°, low 35°.
Pressure30.36 inHg
Wind21.7 mph NW
Humidity40%
Visibility—
Dew point19°
Sun, 2549° / 34°0
49 °
Saint Johns, Sunday, 25 October
Clear. High 49°, low 34°.
Pressure30.21 inHg
Wind9.2 mph E
Humidity39%
Visibility—
Dew point19°
Mon, 2644° / 38°0.03
44 °
Saint Johns, Monday, 26 October
Light rain. High 44°, low 38°.
Pressure30.06 inHg
Wind12.8 mph NW
Humidity60%
Visibility—
Dew point29°
Tue, 2744° / 37°0
44 °
Saint Johns, Tuesday, 27 October
Overcast. High 44°, low 37°.
Pressure29.94 inHg
Wind11.6 mph SE
Humidity67%
Visibility—
Dew point30°
Wed, 2857° / 37°0
57 °
Saint Johns, Wednesday, 28 October
Overcast. High 57°, low 37°.
Pressure29.53 inHg
Wind29.7 mph W
Humidity37%
Visibility—
Dew point25°
Thu, 2950° / 37°0
50 °
Saint Johns, Thursday, 29 October
Partly cloudy. High 50°, low 37°.
Pressure29.94 inHg
Wind19.2 mph W
Humidity39%
Visibility—
Dew point22°
Fri, 3056° / 38°0
56 °
Saint Johns, Friday, 30 October
Overcast. High 56°, low 38°.
Pressure29.77 inHg
Wind31.5 mph W
Humidity38%
Visibility—
Dew point24°
Sat, 3148° / 38°0
48 °
Saint Johns, Saturday, 31 October
Mostly clear. High 48°, low 38°.
Pressure29.88 inHg
Wind28.8 mph W
Humidity33%
Visibility—
Dew point19°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0147° / 29°0.01
47 °
Saint Johns, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.01 in
Chance of precipitation8%
Record high68° (1965)
Record low-19° (1984)
Mon, 0247° / 29°0.02
47 °
Saint Johns, Monday, 2 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.02 in
Chance of precipitation12%
Record high65° (1978)
Record low-14° (1991)
Tue, 0347° / 29°0.02
47 °
Saint Johns, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high47°
Average low29°
Average precipitation0.02 in
Chance of precipitation13%
Record high66° (1983)
Record low-12° (1991)
Wed, 0447° / 31°0.02
47 °
Saint Johns, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high47°
Average low31°
Average precipitation0.02 in
Chance of precipitation10%
Record high69° (1975)
Record low4° (2003)
Thu, 0546° / 29°0.04
46 °
Saint Johns, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high46°
Average low29°
Average precipitation0.04 in
Chance of precipitation25%
Record high67° (1975)
Record low-9° (2003)
Fri, 0644° / 27°0.02
44 °
Saint Johns, Friday, 6 November
Climate normal for this date — 60-year average.
Average high44°
Average low27°
Average precipitation0.02 in
Chance of precipitation15%
Record high66° (2010)
Record low-1° (1991)
Sat, 0744° / 28°0.03
44 °
Saint Johns, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high44°
Average low28°
Average precipitation0.03 in
Chance of precipitation15%
Record high71° (2010)
Record low-4° (1973)
Sun, 0843° / 26°0.04
43 °
Saint Johns, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high43°
Average low26°
Average precipitation0.04 in
Chance of precipitation20%
Record high61° (1999)
Record low-2° (1973)
Mon, 0941° / 25°0.04
41 °
Saint Johns, Monday, 9 November
Climate normal for this date — 60-year average.
Average high41°
Average low25°
Average precipitation0.04 in
Chance of precipitation25%
Record high64° (2016)
Record low-1° (2017)
Tue, 1040° / 24°0.04
40 °
Saint Johns, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high40°
Average low24°
Average precipitation0.04 in
Chance of precipitation22%
Record high60° (2025)
Record low-1° (2019)
Wed, 1140° / 23°0.02
40 °
Saint Johns, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high40°
Average low23°
Average precipitation0.02 in
Chance of precipitation15%
Record high63° (1981)
Record low-16° (2019)
Thu, 1242° / 24°0.02
42 °
Saint Johns, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high42°
Average low24°
Average precipitation0.02 in
Chance of precipitation10%
Record high71° (1999)
Record low-6° (2014)
Fri, 1342° / 26°0.02
42 °
Saint Johns, Friday, 13 November
Climate normal for this date — 60-year average.
Average high42°
Average low26°
Average precipitation0.02 in
Chance of precipitation10%
Record high65° (2025)
Record low-4° (2014)
Sat, 1442° / 25°0.02
42 °
Saint Johns, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high42°
Average low25°
Average precipitation0.02 in
Chance of precipitation12%
Record high64° (1999)
Record low-6° (2014)
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 Saint Johns, MT 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 Saint Johns, MT 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.