Monthly outlook for Thornton, WA: average high 56.2°, average low 41.3°. That is 0.7° above the climate normal for October. Precipitation is expected on 3 days (about 1.0 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 16 October (74.5°), the coolest 24 October (31.7°).
56.2°/41.3°
Average high / low
+0.7°
Above normal
3 / 4
Wet days / normal
1.0 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
16 October – 25 October
60.2°
57.1°
+1.7°
26 October – 4 November
49.5°
50.6°
-0.6°
5 November – 14 November
at normal
46.5°
—
October records over 66 years
85.5°2 October 1975All-time high
13.3°25 October 2020All-time low
Climate normals and records are computed from the nearest reference point — Plaza (14 mi).
Sat, 1765° / 44°0
65 °
Thornton, Saturday, 17 October
Overcast. High 65°, low 44°.
Pressure30.12 inHg
Wind13.8 mph SW
Humidity38%
Visibility6.2 mi
Dew point37°
Sun, 1860° / 40°0
60 °
Thornton, Sunday, 18 October
Partly cloudy. High 60°, low 40°.
Pressure30.09 inHg
Wind2.1 mph SW
Humidity34%
Visibility6.2 mi
Dew point24°
Mon, 1958° / 45°0
58 °
Thornton, Monday, 19 October
Overcast. High 58°, low 45°.
Pressure29.83 inHg
Wind5.2 mph SW
Humidity42%
Visibility6.2 mi
Dew point32°
Tue, 2062° / 46°0
62 °
Thornton, Tuesday, 20 October
Overcast. High 62°, low 46°.
Pressure29.94 inHg
Wind5.5 mph SW
Humidity44%
Visibility—
Dew point33°
Wed, 2165° / 42°0
65 °
Thornton, Wednesday, 21 October
Overcast. High 65°, low 42°.
Pressure29.97 inHg
Wind4.7 mph E
Humidity44%
Visibility—
Dew point35°
Thu, 2263° / 43°0
63 °
Thornton, Thursday, 22 October
Mostly clear. High 63°, low 43°.
Pressure29.91 inHg
Wind6.8 mph W
Humidity35%
Visibility—
Dew point27°
Fri, 2352° / 38°0
52 °
Thornton, Friday, 23 October
Mostly clear. High 52°, low 38°.
Pressure30.06 inHg
Wind15.6 mph SW
Humidity54%
Visibility—
Dew point30°
Sat, 2449° / 32°0
49 °
Thornton, Saturday, 24 October
Clear. High 49°, low 32°.
Pressure30.39 inHg
Wind5.1 mph E
Humidity34%
Visibility—
Dew point15°
Sun, 2554° / 36°0
54 °
Thornton, Sunday, 25 October
Overcast. High 54°, low 36°.
Pressure30.24 inHg
Wind9.8 mph S
Humidity26%
Visibility—
Dew point13°
Mon, 2650° / 44°0.02
50 °
Thornton, Monday, 26 October
Light rain. High 50°, low 44°.
Pressure30.09 inHg
Wind14.2 mph SW
Humidity65%
Visibility—
Dew point36°
Tue, 2746° / 43°0.74
46 °
Thornton, Tuesday, 27 October
Rain. High 46°, low 43°.
Pressure29.80 inHg
Wind16 mph SW
Humidity91%
Visibility—
Dew point42°
Wed, 2844° / 38°0.2
44 °
Thornton, Wednesday, 28 October
Light rain. High 44°, low 38°.
Pressure29.83 inHg
Wind15.8 mph SW
Humidity94%
Visibility—
Dew point39°
Thu, 2948° / 36°0
48 °
Thornton, Thursday, 29 October
Overcast. High 48°, low 36°.
Pressure30.12 inHg
Wind14.3 mph SW
Humidity77%
Visibility—
Dew point37°
Fri, 3058° / 44°0.01
58 °
Thornton, Friday, 30 October
Light rain. High 58°, low 44°.
Pressure29.91 inHg
Wind18.1 mph SW
Humidity50%
Visibility—
Dew point34°
Sat, 3152° / 45°0.06
52 °
Thornton, Saturday, 31 October
Light rain. High 52°, low 45°.
Pressure29.77 inHg
Wind20.2 mph SW
Humidity61%
Visibility—
Dew point37°
From day 17 onward the outlook is built from 60-year climate statistics
Sun, 0150° / 35°0.09
50 °
Thornton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.09 in
Chance of precipitation38%
Record high68° (1965)
Record low19° (2002)
Mon, 0250° / 35°0.09
50 °
Thornton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.09 in
Chance of precipitation37%
Record high65° (1981)
Record low20° (1961)
Tue, 0350° / 35°0.04
50 °
Thornton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.04 in
Chance of precipitation30%
Record high64° (1965)
Record low22° (1973)
Wed, 0449° / 36°0.12
49 °
Thornton, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high49°
Average low36°
Average precipitation0.12 in
Chance of precipitation45%
Record high66° (1975)
Record low22° (2003)
Thu, 0548° / 34°0.08
48 °
Thornton, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.08 in
Chance of precipitation40%
Record high64° (1975)
Record low17° (1973)
Fri, 0648° / 34°0.1
48 °
Thornton, Friday, 6 November
Climate normal for this date — 60-year average.
Average high48°
Average low34°
Average precipitation0.1 in
Chance of precipitation48%
Record high64° (1999)
Record low17° (2003)
Sat, 0747° / 34°0.12
47 °
Thornton, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high47°
Average low34°
Average precipitation0.12 in
Chance of precipitation42%
Record high67° (1999)
Record low13° (2017)
Sun, 0847° / 33°0.06
47 °
Thornton, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high47°
Average low33°
Average precipitation0.06 in
Chance of precipitation30%
Record high65° (2016)
Record low22° (2022)
Mon, 0946° / 33°0.07
46 °
Thornton, Monday, 9 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.07 in
Chance of precipitation38%
Record high60° (1989)
Record low19° (1986)
Tue, 1046° / 33°0.07
46 °
Thornton, Tuesday, 10 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.07 in
Chance of precipitation37%
Record high62° (2016)
Record low12° (2022)
Wed, 1146° / 33°0.07
46 °
Thornton, Wednesday, 11 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.07 in
Chance of precipitation30%
Record high62° (2016)
Record low2° (2000)
Thu, 1246° / 33°0.09
46 °
Thornton, Thursday, 12 November
Climate normal for this date — 60-year average.
Average high46°
Average low33°
Average precipitation0.09 in
Chance of precipitation38%
Record high67° (1999)
Record low6° (2000)
Fri, 1345° / 33°0.09
45 °
Thornton, Friday, 13 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.09 in
Chance of precipitation43%
Record high63° (1999)
Record low6° (2000)
Sat, 1445° / 33°0.05
45 °
Thornton, Saturday, 14 November
Climate normal for this date — 60-year average.
Average high45°
Average low33°
Average precipitation0.05 in
Chance of precipitation30%
Record high66° (1999)
Record low13° (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 Thornton, 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 Thornton, 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.