Monthly outlook for Boise, WA: average high 55.7°, average low 41°. That is 0° above the climate normal for October. Precipitation is expected on 8 days (about 2.3 inches), against a normal of 8 days and 3.3 inches. The warmest day looks like 16 October (74.7°), the coolest 26 October (35.2°).
55.7°/41°
Average high / low
+0°
Above normal
8 / 8
Wet days / normal
2.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
15 October – 24 October
58.7°
57.1°
+0.9°
25 October – 3 November
50.7°
52.9°
-1.2°
4 November – 13 November
at normal
50.5°
—
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).
Fri, 1675° / 53°0
75 °
Boise, Friday, 16 October
Overcast. High 75°, low 53°.
Pressure30.15 inHg
Wind1.8 mph W
Humidity50%
Visibility6.2 mi
Dew point50°
Sat, 1760° / 44°0.23
60 °
Boise, Saturday, 17 October
Rain. High 60°, low 44°.
Pressure30.24 inHg
Wind4.3 mph W
Humidity77%
Visibility6.2 mi
Dew point52°
Sun, 1857° / 35°0
57 °
Boise, Sunday, 18 October
Overcast. High 57°, low 35°.
Pressure30.06 inHg
Wind2.4 mph NW
Humidity64%
Visibility6.2 mi
Dew point42°
Mon, 1956° / 40°0.01
56 °
Boise, Monday, 19 October
Light rain. High 56°, low 40°.
Pressure29.91 inHg
Wind3 mph NW
Humidity66%
Visibility6.2 mi
Dew point44°
Tue, 2058° / 41°0
58 °
Boise, Tuesday, 20 October
Clear. High 58°, low 41°.
Pressure30.09 inHg
Wind5.7 mph N
Humidity75%
Visibility—
Dew point44°
Wed, 2162° / 42°0
62 °
Boise, Wednesday, 21 October
Mostly clear. High 62°, low 42°.
Pressure29.91 inHg
Wind4.9 mph S
Humidity55%
Visibility—
Dew point38°
Thu, 2258° / 45°0.1
58 °
Boise, Thursday, 22 October
Light rain. High 58°, low 45°.
Pressure30.09 inHg
Wind12.1 mph SW
Humidity77%
Visibility—
Dew point45°
Fri, 2347° / 44°0.39
47 °
Boise, Friday, 23 October
Rain. High 47°, low 44°.
Pressure30.36 inHg
Wind4.1 mph S
Humidity83%
Visibility—
Dew point42°
Sat, 2449° / 40°0.17
49 °
Boise, Saturday, 24 October
Light rain. High 49°, low 40°.
Pressure30.27 inHg
Wind3.9 mph NW
Humidity84%
Visibility—
Dew point41°
Sun, 2552° / 36°0
52 °
Boise, Sunday, 25 October
Partly cloudy. High 52°, low 36°.
Pressure30.21 inHg
Wind6.9 mph N
Humidity76%
Visibility—
Dew point37°
Mon, 2653° / 35°0
53 °
Boise, Monday, 26 October
Clear. High 53°, low 35°.
Pressure30.03 inHg
Wind4.3 mph SE
Humidity59%
Visibility—
Dew point32°
Tue, 2755° / 36°0.09
55 °
Boise, Tuesday, 27 October
Light rain. High 55°, low 36°.
Pressure29.91 inHg
Wind4.9 mph W
Humidity35%
Visibility—
Dew point22°
Wed, 2852° / 37°0.22
52 °
Boise, Wednesday, 28 October
Light rain. High 52°, low 37°.
Pressure29.97 inHg
Wind12.6 mph SW
Humidity80%
Visibility—
Dew point40°
Thu, 2948° / 37°0.17
48 °
Boise, Thursday, 29 October
Rain. High 48°, low 37°.
Pressure30.09 inHg
Wind8.5 mph SW
Humidity84%
Visibility—
Dew point38°
Fri, 3044° / 41°0.95
44 °
Boise, Friday, 30 October
Rain. High 44°, low 41°.
Pressure30.12 inHg
Wind4 mph S
Humidity93%
Visibility—
Dew point41°
From day 17 onward the outlook is built from 60-year climate statistics
Sat, 3152° / 41°0.33
52 °
Boise, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high52°
Average low41°
Average precipitation0.33 in
Chance of precipitation60%
Record high65° (1964)
Record low28° (2006)
Sun, 0152° / 40°0.26
52 °
Boise, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high52°
Average low40°
Average precipitation0.26 in
Chance of precipitation55%
Record high67° (1969)
Record low28° (2003)
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)
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.