Monthly outlook for Harrison, ID: average high 59.3°, average low 38.8°. That is 0.9° above the climate normal for October. Precipitation is expected on 2 days (about 0.5 inches), against a normal of 4 days and 1.0 inches. The warmest day looks like 8 October (75.6°), the coolest 16 October (33.1°).
59.3°/38.8°
Average high / low
+0.9°
Above normal
2 / 4
Wet days / normal
0.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
8 October – 17 October
58.9°
58.7°
+0.1°
18 October – 27 October
59.9°
54.7°
+2.9°
28 October – 6 November
at normal
48.3°
—
October records over 66 years
84.9°2 October 1987All-time high
4.8°26 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Plummer (10 mi).
Fri, 0967° / 41°0
67 °
Harrison, Friday, 9 October
Overcast. High 67°, low 41°.
Pressure29.62 inHg
Wind13.8 mph SW
Humidity42%
Visibility6.2 mi
Dew point40°
Sat, 1055° / 40°0
55 °
Harrison, Saturday, 10 October
Clear. High 55°, low 40°.
Pressure29.80 inHg
Wind1.6 mph S
Humidity52%
Visibility6.2 mi
Dew point33°
Sun, 1147° / 41°0.01
47 °
Harrison, Sunday, 11 October
Light rain. High 47°, low 41°.
Pressure30.00 inHg
Wind12.8 mph NE
Humidity66%
Visibility6.2 mi
Dew point30°
Mon, 1256° / 39°0
56 °
Harrison, Monday, 12 October
Clear. High 56°, low 39°.
Pressure29.97 inHg
Wind7.2 mph N
Humidity53%
Visibility—
Dew point32°
Tue, 1360° / 42°0
60 °
Harrison, Tuesday, 13 October
Clear. High 60°, low 42°.
Pressure30.00 inHg
Wind3.8 mph SW
Humidity55%
Visibility—
Dew point36°
Wed, 1448° / 36°0.16
48 °
Harrison, Wednesday, 14 October
Light rain. High 48°, low 36°.
Pressure29.85 inHg
Wind13.7 mph SW
Humidity58%
Visibility—
Dew point33°
Thu, 1557° / 36°0
57 °
Harrison, Thursday, 15 October
Mostly clear. High 57°, low 36°.
Pressure30.42 inHg
Wind4.6 mph NE
Humidity57%
Visibility—
Dew point33°
Fri, 1661° / 33°0
61 °
Harrison, Friday, 16 October
Clear. High 61°, low 33°.
Pressure30.45 inHg
Wind3.5 mph E
Humidity33%
Visibility—
Dew point22°
Sat, 1763° / 36°0
63 °
Harrison, Saturday, 17 October
Overcast. High 63°, low 36°.
Pressure30.24 inHg
Wind3 mph E
Humidity34%
Visibility—
Dew point25°
Sun, 1866° / 38°0
66 °
Harrison, Sunday, 18 October
Overcast. High 66°, low 38°.
Pressure30.12 inHg
Wind4.5 mph SW
Humidity33%
Visibility—
Dew point26°
Mon, 1962° / 42°0
62 °
Harrison, Monday, 19 October
Clear. High 62°, low 42°.
Pressure30.24 inHg
Wind9.1 mph SW
Humidity46%
Visibility—
Dew point35°
Tue, 2066° / 41°0
66 °
Harrison, Tuesday, 20 October
Overcast. High 66°, low 41°.
Pressure30.33 inHg
Wind7.5 mph SW
Humidity45%
Visibility—
Dew point35°
Wed, 2162° / 39°0
62 °
Harrison, Wednesday, 21 October
Partly cloudy. High 62°, low 39°.
Pressure30.42 inHg
Wind5.1 mph NW
Humidity29%
Visibility—
Dew point24°
Thu, 2256° / 36°0.01
56 °
Harrison, Thursday, 22 October
Light rain. High 56°, low 36°.
Pressure30.03 inHg
Wind8.5 mph SW
Humidity23%
Visibility—
Dew point15°
Fri, 2347° / 35°0.34
47 °
Harrison, Friday, 23 October
Snow. High 47°, low 35°.
Pressure30.03 inHg
Wind5.1 mph S
Humidity83%
Visibility—
Dew point36°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 2454° / 37°0.06
54 °
Harrison, Saturday, 24 October
Climate normal for this date — 60-year average.
Average high54°
Average low37°
Average precipitation0.06 in
Chance of precipitation28%
Record high68° (2007)
Record low19° (2020)
Sun, 2554° / 37°0.09
54 °
Harrison, Sunday, 25 October
Climate normal for this date — 60-year average.
Average high54°
Average low37°
Average precipitation0.09 in
Chance of precipitation42%
Record high71° (1965)
Record low10° (2020)
Mon, 2652° / 36°0.08
52 °
Harrison, Monday, 26 October
Climate normal for this date — 60-year average.
Average high52°
Average low36°
Average precipitation0.08 in
Chance of precipitation38%
Record high69° (1965)
Record low5° (2020)
Tue, 2751° / 36°0.07
51 °
Harrison, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high51°
Average low36°
Average precipitation0.07 in
Chance of precipitation37%
Record high68° (1965)
Record low18° (2020)
Wed, 2851° / 35°0.08
51 °
Harrison, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high51°
Average low35°
Average precipitation0.08 in
Chance of precipitation42%
Record high67° (1987)
Record low19° (2023)
Thu, 2949° / 35°0.11
49 °
Harrison, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.11 in
Chance of precipitation37%
Record high68° (1962)
Record low15° (2019)
Fri, 3049° / 35°0.09
49 °
Harrison, Friday, 30 October
Climate normal for this date — 60-year average.
Average high49°
Average low35°
Average precipitation0.09 in
Chance of precipitation33%
Record high67° (2008)
Record low14° (2019)
Sat, 3148° / 35°0.11
48 °
Harrison, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.11 in
Chance of precipitation35%
Record high67° (1988)
Record low11° (1984)
Sun, 0148° / 34°0.12
48 °
Harrison, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.12 in
Chance of precipitation45%
Record high67° (1965)
Record low12° (1984)
Mon, 0248° / 34°0.12
48 °
Harrison, Monday, 2 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.12 in
Chance of precipitation42%
Record high65° (1981)
Record low21° (1961)
Tue, 0348° / 35°0.06
48 °
Harrison, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.06 in
Chance of precipitation37%
Record high63° (1965)
Record low17° (1994)
Wed, 0448° / 35°0.16
48 °
Harrison, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.16 in
Chance of precipitation48%
Record high64° (1975)
Record low20° (1973)
Thu, 0547° / 34°0.11
47 °
Harrison, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.11 in
Chance of precipitation48%
Record high63° (1975)
Record low16° (1973)
Fri, 0647° / 34°0.13
47 °
Harrison, Friday, 6 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.13 in
Chance of precipitation53%
Record high64° (2012)
Record low15° (1994)
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 Harrison, ID 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 Harrison, ID 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.