Monthly outlook for Boise, WA: average high 53.9°, average low 40.6°. That is 0.5° below the climate normal for October. Precipitation is expected on 8 days (about 3.5 inches), against a normal of 8 days and 3.6 inches. The warmest day looks like 21 October (61°), the coolest 1 November (34.8°).
53.9°/40.6°
Average high / low
−0.5°
Below normal
8 / 8
Wet days / normal
3.5 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
17 October – 26 October
56.5°
56.2°
+0.2°
27 October – 5 November
49.6°
52.4°
-1.6°
6 November – 15 November
at normal
50°
—
October records over 66 years
86.2°1 October 1987All-time high
24.1°28 October 2023All-time low
Climate normals and records are computed from the nearest reference point — Graham (16 mi).
Sun, 1861° / 35°0
61 °
Boise, Sunday, 18 October
Overcast. High 61°, low 35°.
Pressure30.15 inHg
Wind3.9 mph NW
Humidity65%
Visibility6.2 mi
Dew point44°
Mon, 1956° / 40°0
56 °
Boise, Monday, 19 October
Overcast. High 56°, low 40°.
Pressure29.97 inHg
Wind1.8 mph W
Humidity69%
Visibility1.9 mi
Dew point45°
Tue, 2058° / 37°0
58 °
Boise, Tuesday, 20 October
Partly cloudy. High 58°, low 37°.
Pressure30.06 inHg
Wind3.9 mph NW
Humidity75%
Visibility3.4 mi
Dew point47°
Wed, 2161° / 39°0
61 °
Boise, Wednesday, 21 October
Mostly clear. High 61°, low 39°.
Pressure29.97 inHg
Wind3.4 mph E
Humidity68%
Visibility—
Dew point42°
Thu, 2254° / 42°0
54 °
Boise, Thursday, 22 October
Overcast. High 54°, low 42°.
Pressure30.00 inHg
Wind4.5 mph S
Humidity79%
Visibility—
Dew point43°
Fri, 2357° / 42°0
57 °
Boise, Friday, 23 October
Overcast. High 57°, low 42°.
Pressure30.06 inHg
Wind4.9 mph E
Humidity57%
Visibility—
Dew point37°
Sat, 2452° / 44°0.28
52 °
Boise, Saturday, 24 October
Light rain. High 52°, low 44°.
Pressure29.71 inHg
Wind9.2 mph E
Humidity83%
Visibility—
Dew point44°
Sun, 2553° / 42°0.04
53 °
Boise, Sunday, 25 October
Light rain. High 53°, low 42°.
Pressure29.94 inHg
Wind5.8 mph S
Humidity69%
Visibility—
Dew point40°
Mon, 2653° / 44°0.79
53 °
Boise, Monday, 26 October
Rain. High 53°, low 44°.
Pressure29.80 inHg
Wind11.1 mph SW
Humidity84%
Visibility—
Dew point46°
Tue, 2749° / 45°0.37
49 °
Boise, Tuesday, 27 October
Light rain. High 49°, low 45°.
Pressure29.85 inHg
Wind13.6 mph SW
Humidity92%
Visibility—
Dew point43°
Wed, 2847° / 43°1.07
47 °
Boise, Wednesday, 28 October
Heavy rain. High 47°, low 43°.
Pressure29.77 inHg
Wind12.9 mph S
Humidity86%
Visibility—
Dew point43°
Thu, 2950° / 39°0.34
50 °
Boise, Thursday, 29 October
Light rain. High 50°, low 39°.
Pressure29.83 inHg
Wind5.3 mph SE
Humidity89%
Visibility—
Dew point41°
Fri, 3051° / 39°0.06
51 °
Boise, Friday, 30 October
Light rain. High 51°, low 39°.
Pressure30.00 inHg
Wind5.4 mph SW
Humidity85%
Visibility—
Dew point40°
Sat, 3147° / 38°0.39
47 °
Boise, Saturday, 31 October
Rain. High 47°, low 38°.
Pressure29.50 inHg
Wind6.7 mph E
Humidity91%
Visibility—
Dew point42°
Sun, 0154° / 35°0
54 °
Boise, Sunday, 1 November
Partly cloudy. High 54°, low 35°.
Pressure29.74 inHg
Wind5 mph NE
Humidity66%
Visibility—
Dew point35°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 0253° / 40°0.22
53 °
Boise, Monday, 2 November
Climate normal for this date — 60-year average.
Average high53°
Average low40°
Average precipitation0.22 in
Chance of precipitation60%
Record high67° (1962)
Record low27° (1973)
Tue, 0352° / 41°0.28
52 °
Boise, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.28 in
Chance of precipitation62%
Record high65° (2010)
Record low28° (2003)
Wed, 0452° / 41°0.35
52 °
Boise, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.35 in
Chance of precipitation60%
Record high67° (1980)
Record low28° (2003)
Thu, 0551° / 40°0.22
51 °
Boise, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.22 in
Chance of precipitation67%
Record high64° (1997)
Record low23° (1973)
Fri, 0651° / 40°0.35
51 °
Boise, Friday, 6 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.35 in
Chance of precipitation58%
Record high63° (1999)
Record low27° (2003)
Sat, 0751° / 40°0.31
51 °
Boise, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high51°
Average low40°
Average precipitation0.31 in
Chance of precipitation68%
Record high64° (2016)
Record low27° (2017)
Sun, 0851° / 39°0.2
51 °
Boise, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high51°
Average low39°
Average precipitation0.2 in
Chance of precipitation48%
Record high66° (2016)
Record low27° (2020)
Mon, 0949° / 39°0.25
49 °
Boise, Monday, 9 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.25 in
Chance of precipitation72%
Record high61° (1976)
Record low24° (2020)
Tue, 1050° / 39°0.22
50 °
Boise, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high50°
Average low39°
Average precipitation0.22 in
Chance of precipitation52%
Record high64° (2016)
Record low24° (1986)
Wed, 1150° / 39°0.31
50 °
Boise, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high50°
Average low39°
Average precipitation0.31 in
Chance of precipitation62%
Record high62° (1990)
Record low21° (1985)
Thu, 1250° / 40°0.34
50 °
Boise, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high50°
Average low40°
Average precipitation0.34 in
Chance of precipitation67%
Record high62° (1990)
Record low20° (1985)
Fri, 1350° / 39°0.33
50 °
Boise, Friday, 13 November
Climate normal for this date — 60-year average.
Average high50°
Average low39°
Average precipitation0.33 in
Chance of precipitation63%
Record high63° (1967)
Record low21° (1985)
Sat, 1449° / 39°0.3
49 °
Boise, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high49°
Average low39°
Average precipitation0.3 in
Chance of precipitation53%
Record high64° (1999)
Record low17° (1964)
Sun, 1549° / 38°0.28
49 °
Boise, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high49°
Average low38°
Average precipitation0.28 in
Chance of precipitation65%
Record high60° (2001)
Record low14° (1964)
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 Boise, WA 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 Boise, WA 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.