Monthly outlook for Diablo, WA: average high 59.2°, average low 43.6°. That is 3.9° above the climate normal for October. Precipitation is expected on 5 days (about 0.8 inches), against a normal of 9 days and 5.0 inches. The warmest day looks like 28 October (67.7°), the coolest 20 October (39.4°).
59.2°/43.6°
Average high / low
+3.9°
Above normal
5 / 9
Wet days / normal
0.8 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
20 October – 29 October
60.6°
53.6°
+3.9°
30 October – 8 November
56.8°
49°
+4.3°
9 November – 18 November
at normal
45.6°
—
October records over 66 years
88°1 October 1987All-time high
3.2°28 October 1991All-time low
Wed, 2163° / 42°0
63 °
Diablo, Wednesday, 21 October
Mostly clear. High 63°, low 42°.
Pressure29.97 inHg
Wind0.5 mph S
Humidity46%
Visibility0.4 mi
Dew point36°
Thu, 2261° / 46°0.1
61 °
Diablo, Thursday, 22 October
Light rain. High 61°, low 46°.
Pressure29.91 inHg
Wind3 mph S
Humidity61%
Visibility6.2 mi
Dew point40°
Fri, 2355° / 40°0
55 °
Diablo, Friday, 23 October
Partly cloudy. High 55°, low 40°.
Pressure30.30 inHg
Wind1.8 mph NE
Humidity66%
Visibility6.2 mi
Dew point30°
Sat, 2447° / 43°0.09
47 °
Diablo, Saturday, 24 October
Light rain. High 47°, low 43°.
Pressure30.21 inHg
Wind1.7 mph N
Humidity85%
Visibility—
Dew point42°
Sun, 2560° / 42°0
60 °
Diablo, Sunday, 25 October
Overcast. High 60°, low 42°.
Pressure30.33 inHg
Wind4.3 mph NE
Humidity88%
Visibility—
Dew point45°
Mon, 2665° / 41°0
65 °
Diablo, Monday, 26 October
Clear. High 65°, low 41°.
Pressure30.24 inHg
Wind5.1 mph E
Humidity26%
Visibility—
Dew point20°
Tue, 2763° / 42°0
63 °
Diablo, Tuesday, 27 October
Overcast. High 63°, low 42°.
Pressure30.27 inHg
Wind5.2 mph E
Humidity25%
Visibility—
Dew point19°
Wed, 2868° / 43°0
68 °
Diablo, Wednesday, 28 October
Overcast. High 68°, low 43°.
Pressure30.09 inHg
Wind4.5 mph E
Humidity25%
Visibility—
Dew point22°
Thu, 2964° / 44°0
64 °
Diablo, Thursday, 29 October
Overcast. High 64°, low 44°.
Pressure29.91 inHg
Wind3.4 mph E
Humidity34%
Visibility—
Dew point28°
Fri, 3066° / 46°0
66 °
Diablo, Friday, 30 October
Overcast. High 66°, low 46°.
Pressure29.77 inHg
Wind4 mph E
Humidity34%
Visibility—
Dew point28°
Sat, 3160° / 46°0
60 °
Diablo, Saturday, 31 October
Overcast. High 60°, low 46°.
Pressure29.80 inHg
Wind4.7 mph E
Humidity58%
Visibility—
Dew point40°
Sun, 0150° / 43°0.34
50 °
Diablo, Sunday, 1 November
Rain. High 50°, low 43°.
Pressure30.03 inHg
Wind3.7 mph E
Humidity98%
Visibility—
Dew point46°
Mon, 0250° / 43°0.15
50 °
Diablo, Monday, 2 November
Light rain. High 50°, low 43°.
Pressure30.30 inHg
Wind4.5 mph E
Humidity94%
Visibility—
Dew point45°
Tue, 0362° / 47°0
62 °
Diablo, Tuesday, 3 November
Overcast. High 62°, low 47°.
Pressure29.97 inHg
Wind4.9 mph E
Humidity78%
Visibility—
Dew point48°
Wed, 0453° / 49°0.16
53 °
Diablo, Wednesday, 4 November
Rain. High 53°, low 49°.
Pressure29.65 inHg
Wind4.1 mph E
Humidity81%
Visibility—
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 0549° / 37°0.29
49 °
Diablo, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high49°
Average low37°
Average precipitation0.29 in
Chance of precipitation60%
Record high65° (1987)
Record low9° (1973)
Fri, 0648° / 36°0.41
48 °
Diablo, Friday, 6 November
Climate normal for this date — 60-year average.
Average high48°
Average low36°
Average precipitation0.41 in
Chance of precipitation63%
Record high60° (2012)
Record low15° (1968)
Sat, 0747° / 36°0.41
47 °
Diablo, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high47°
Average low36°
Average precipitation0.41 in
Chance of precipitation68%
Record high64° (2024)
Record low19° (1993)
Sun, 0848° / 35°0.28
48 °
Diablo, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high48°
Average low35°
Average precipitation0.28 in
Chance of precipitation58%
Record high66° (2019)
Record low6° (1966)
Mon, 0947° / 36°0.32
47 °
Diablo, Monday, 9 November
Climate normal for this date — 60-year average.
Average high47°
Average low36°
Average precipitation0.32 in
Chance of precipitation58%
Record high64° (2025)
Record low2° (1986)
Tue, 1047° / 35°0.3
47 °
Diablo, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high47°
Average low35°
Average precipitation0.3 in
Chance of precipitation53%
Record high62° (2016)
Record low-1° (1986)
Wed, 1147° / 34°0.36
47 °
Diablo, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.36 in
Chance of precipitation63%
Record high65° (2016)
Record low0° (1978)
Thu, 1246° / 35°0.42
46 °
Diablo, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.42 in
Chance of precipitation68%
Record high59° (1976)
Record low4° (1978)
Fri, 1346° / 34°0.44
46 °
Diablo, Friday, 13 November
Climate normal for this date — 60-year average.
Average high46°
Average low34°
Average precipitation0.44 in
Chance of precipitation65%
Record high61° (2018)
Record low5° (1980)
Sat, 1446° / 34°0.39
46 °
Diablo, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high46°
Average low34°
Average precipitation0.39 in
Chance of precipitation58%
Record high59° (1999)
Record low4° (1964)
Sun, 1545° / 33°0.44
45 °
Diablo, Sunday, 15 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.44 in
Chance of precipitation68%
Record high58° (1999)
Record low12° (1991)
Mon, 1644° / 35°0.36
44 °
Diablo, Monday, 16 November
Climate normal for this date — 60-year average.
Average high44°
Average low35°
Average precipitation0.36 in
Chance of precipitation75%
Record high60° (2008)
Record low10° (2000)
Tue, 1744° / 33°0.4
44 °
Diablo, Tuesday, 17 November
Climate normal for this date — 60-year average.
Average high44°
Average low33°
Average precipitation0.4 in
Chance of precipitation68%
Record high61° (2008)
Record low2° (2000)
Wed, 1844° / 33°0.31
44 °
Diablo, Wednesday, 18 November
Climate normal for this date — 60-year average.
Average high44°
Average low33°
Average precipitation0.31 in
Chance of precipitation65%
Record high60° (2018)
Record low15° (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 Diablo, 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 Diablo, 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.