Monthly outlook for Thornton, WA: average high 57.9°, average low 40.2°. That is 0.8° above the climate normal for October. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 4 days and 0.9 inches. The warmest day looks like 16 October (73.9°), the coolest 13 October (29.7°).
57.9°/40.2°
Average high / low
+0.8°
Above normal
1 / 4
Wet days / normal
0.1 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
13 October – 22 October
59.4°
58.2°
+0.6°
23 October – 1 November
55.6°
52.3°
+1.8°
2 November – 11 November
at normal
47.7°
—
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).
Wed, 1461° / 36°0
61 °
Thornton, Wednesday, 14 October
Mostly clear. High 61°, low 36°.
Pressure30.27 inHg
Wind4.5 mph SW
Humidity36%
Visibility6.2 mi
Dew point28°
Thu, 1568° / 38°0
68 °
Thornton, Thursday, 15 October
Mostly clear. High 68°, low 38°.
Pressure30.47 inHg
Wind5.9 mph E
Humidity37%
Visibility6.2 mi
Dew point37°
Fri, 1674° / 47°0
74 °
Thornton, Friday, 16 October
Partly cloudy. High 74°, low 47°.
Pressure30.27 inHg
Wind8.2 mph S
Humidity24%
Visibility6.2 mi
Dew point32°
Sat, 1765° / 48°0
65 °
Thornton, Saturday, 17 October
Overcast. High 65°, low 48°.
Pressure30.06 inHg
Wind13.5 mph SW
Humidity42%
Visibility6.2 mi
Dew point39°
Sun, 1865° / 42°0
65 °
Thornton, Sunday, 18 October
Clear. High 65°, low 42°.
Pressure29.97 inHg
Wind5.8 mph S
Humidity43%
Visibility—
Dew point36°
Mon, 1952° / 44°0.01
52 °
Thornton, Monday, 19 October
Light rain. High 52°, low 44°.
Pressure29.88 inHg
Wind12.4 mph SW
Humidity58%
Visibility—
Dew point32°
Tue, 2050° / 38°0
50 °
Thornton, Tuesday, 20 October
Partly cloudy. High 50°, low 38°.
Pressure30.03 inHg
Wind8.2 mph SW
Humidity64%
Visibility—
Dew point34°
Wed, 2153° / 38°0
53 °
Thornton, Wednesday, 21 October
Clear. High 53°, low 38°.
Pressure30.15 inHg
Wind7.9 mph SW
Humidity55%
Visibility—
Dew point31°
Thu, 2252° / 41°0.04
52 °
Thornton, Thursday, 22 October
Light rain. High 52°, low 41°.
Pressure30.00 inHg
Wind16.9 mph W
Humidity62%
Visibility—
Dew point36°
Fri, 2350° / 34°0
50 °
Thornton, Friday, 23 October
Clear. High 50°, low 34°.
Pressure30.50 inHg
Wind7.6 mph SW
Humidity58%
Visibility—
Dew point29°
Sat, 2456° / 38°0
56 °
Thornton, Saturday, 24 October
Overcast. High 56°, low 38°.
Pressure30.47 inHg
Wind11.3 mph S
Humidity38%
Visibility—
Dew point25°
Sun, 2561° / 42°0
61 °
Thornton, Sunday, 25 October
Clear. High 61°, low 42°.
Pressure30.39 inHg
Wind5.5 mph E
Humidity33%
Visibility—
Dew point24°
Mon, 2659° / 44°0
59 °
Thornton, Monday, 26 October
Overcast. High 59°, low 44°.
Pressure30.06 inHg
Wind7 mph SW
Humidity40%
Visibility—
Dew point29°
Tue, 2755° / 44°0
55 °
Thornton, Tuesday, 27 October
Overcast. High 55°, low 44°.
Pressure29.91 inHg
Wind16.1 mph SW
Humidity62%
Visibility—
Dew point37°
Wed, 2853° / 39°0
53 °
Thornton, Wednesday, 28 October
Overcast. High 53°, low 39°.
Pressure30.21 inHg
Wind8.8 mph SW
Humidity62%
Visibility—
Dew point35°
From day 17 onward the outlook is built from 60-year climate statistics
Thu, 2951° / 36°0.07
51 °
Thornton, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high51°
Average low36°
Average precipitation0.07 in
Chance of precipitation30%
Record high68° (1983)
Record low17° (2019)
Fri, 3050° / 35°0.06
50 °
Thornton, Friday, 30 October
Climate normal for this date — 60-year average.
Average high50°
Average low35°
Average precipitation0.06 in
Chance of precipitation30%
Record high67° (2008)
Record low15° (2019)
Sat, 3150° / 36°0.09
50 °
Thornton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high50°
Average low36°
Average precipitation0.09 in
Chance of precipitation28%
Record high67° (1988)
Record low17° (1984)
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)
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.