Monthly outlook for Thornton, CO: average high 69.6°, average low 48.6°. That is 3.5° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 3 days and 0.8 inches. The warmest day looks like 10 October (83.6°), the coolest 17 October (33.7°).
69.6°/48.6°
Average high / low
+3.5°
Above normal
2 / 3
Wet days / normal
0.3 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
10 October – 19 October
69°
64°
+2.8°
20 October – 29 October
70.5°
60.4°
+5.6°
30 October – 8 November
at normal
53.9°
—
October records over 66 years
88.2°3 October 2025All-time high
-5.3°30 October 1993All-time low
Sun, 1180° / 61°0
80 °
Thornton, Sunday, 11 October
Overcast. High 80°, low 61°.
Pressure29.65 inHg
Wind1.7 mph S
Humidity26%
Visibility6.2 mi
Dew point38°
Mon, 1282° / 58°0
82 °
Thornton, Monday, 12 October
Clear. High 82°, low 58°.
Pressure29.68 inHg
Wind8.2 mph S
Humidity19%
Visibility6.2 mi
Dew point32°
Tue, 1364° / 53°0
64 °
Thornton, Tuesday, 13 October
Overcast. High 64°, low 53°.
Pressure29.88 inHg
Wind5 mph E
Humidity62%
Visibility6.2 mi
Dew point46°
Wed, 1455° / 49°0.24
55 °
Thornton, Wednesday, 14 October
Light rain. High 55°, low 49°.
Pressure30.15 inHg
Wind7.9 mph NE
Humidity81%
Visibility—
Dew point46°
Thu, 1558° / 48°0.07
58 °
Thornton, Thursday, 15 October
Light rain. High 58°, low 48°.
Pressure30.24 inHg
Wind12.1 mph NE
Humidity75%
Visibility—
Dew point45°
Fri, 1657° / 37°0
57 °
Thornton, Friday, 16 October
Overcast. High 57°, low 37°.
Pressure30.36 inHg
Wind18.6 mph NE
Humidity41%
Visibility—
Dew point25°
Sat, 1759° / 34°0
59 °
Thornton, Saturday, 17 October
Clear. High 59°, low 34°.
Pressure30.45 inHg
Wind8.4 mph E
Humidity19%
Visibility—
Dew point8°
Sun, 1879° / 40°0
79 °
Thornton, Sunday, 18 October
Partly cloudy. High 79°, low 40°.
Pressure29.97 inHg
Wind9.4 mph NW
Humidity7%
Visibility—
Dew point-1°
Mon, 1974° / 51°0
74 °
Thornton, Monday, 19 October
Overcast. High 74°, low 51°.
Pressure29.94 inHg
Wind7.5 mph S
Humidity11%
Visibility—
Dew point11°
Tue, 2075° / 52°0
75 °
Thornton, Tuesday, 20 October
Clear. High 75°, low 52°.
Pressure29.88 inHg
Wind9.2 mph SE
Humidity12%
Visibility—
Dew point13°
Wed, 2176° / 52°0.01
76 °
Thornton, Wednesday, 21 October
Light rain. High 76°, low 52°.
Pressure29.71 inHg
Wind12.6 mph N
Humidity14%
Visibility—
Dew point18°
Thu, 2262° / 48°0.01
62 °
Thornton, Thursday, 22 October
Light rain. High 62°, low 48°.
Pressure30.09 inHg
Wind28.1 mph W
Humidity14%
Visibility—
Dew point7°
Fri, 2373° / 47°0
73 °
Thornton, Friday, 23 October
Overcast. High 73°, low 47°.
Pressure29.80 inHg
Wind21.8 mph W
Humidity12%
Visibility—
Dew point12°
Sat, 2463° / 45°0
63 °
Thornton, Saturday, 24 October
Clear. High 63°, low 45°.
Pressure30.00 inHg
Wind25.3 mph W
Humidity41%
Visibility—
Dew point30°
Sun, 2573° / 43°0
73 °
Thornton, Sunday, 25 October
Overcast. High 73°, low 43°.
Pressure29.56 inHg
Wind9.2 mph W
Humidity19%
Visibility—
Dew point17°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 2659° / 34°0.07
59 °
Thornton, Monday, 26 October
Climate normal for this date — 60-year average.
Average high59°
Average low34°
Average precipitation0.07 in
Chance of precipitation17%
Record high76° (1977)
Record low-1° (2020)
Tue, 2758° / 33°0.03
58 °
Thornton, Tuesday, 27 October
Climate normal for this date — 60-year average.
Average high58°
Average low33°
Average precipitation0.03 in
Chance of precipitation23%
Record high80° (2016)
Record low0° (2020)
Wed, 2859° / 32°0.06
59 °
Thornton, Wednesday, 28 October
Climate normal for this date — 60-year average.
Average high59°
Average low32°
Average precipitation0.06 in
Chance of precipitation18%
Record high79° (2024)
Record low7° (2011)
Thu, 2957° / 32°0.07
57 °
Thornton, Thursday, 29 October
Climate normal for this date — 60-year average.
Average high57°
Average low32°
Average precipitation0.07 in
Chance of precipitation27%
Record high78° (2018)
Record low5° (2019)
Fri, 3054° / 30°0.05
54 °
Thornton, Friday, 30 October
Climate normal for this date — 60-year average.
Average high54°
Average low30°
Average precipitation0.05 in
Chance of precipitation27%
Record high76° (1968)
Record low-5° (1993)
Sat, 3153° / 30°0.04
53 °
Thornton, Saturday, 31 October
Climate normal for this date — 60-year average.
Average high53°
Average low30°
Average precipitation0.04 in
Chance of precipitation23%
Record high76° (2016)
Record low4° (2019)
Sun, 0153° / 30°0.07
53 °
Thornton, Sunday, 1 November
Climate normal for this date — 60-year average.
Average high53°
Average low30°
Average precipitation0.07 in
Chance of precipitation27%
Record high72° (1988)
Record low8° (1979)
Mon, 0252° / 29°0.07
52 °
Thornton, Monday, 2 November
Climate normal for this date — 60-year average.
Average high52°
Average low29°
Average precipitation0.07 in
Chance of precipitation27%
Record high81° (2025)
Record low2° (1991)
Tue, 0353° / 28°0.05
53 °
Thornton, Tuesday, 3 November
Climate normal for this date — 60-year average.
Average high53°
Average low28°
Average precipitation0.05 in
Chance of precipitation22%
Record high72° (2020)
Record low-8° (1991)
Wed, 0454° / 29°0.03
54 °
Thornton, Wednesday, 4 November
Climate normal for this date — 60-year average.
Average high54°
Average low29°
Average precipitation0.03 in
Chance of precipitation18%
Record high74° (2020)
Record low5° (2002)
Thu, 0555° / 29°0.03
55 °
Thornton, Thursday, 5 November
Climate normal for this date — 60-year average.
Average high55°
Average low29°
Average precipitation0.03 in
Chance of precipitation15%
Record high73° (2023)
Record low2° (1967)
Fri, 0655° / 29°0.03
55 °
Thornton, Friday, 6 November
Climate normal for this date — 60-year average.
Average high55°
Average low29°
Average precipitation0.03 in
Chance of precipitation13%
Record high74° (2010)
Record low3° (1967)
Sat, 0755° / 29°0.02
55 °
Thornton, Saturday, 7 November
Climate normal for this date — 60-year average.
Average high55°
Average low29°
Average precipitation0.02 in
Chance of precipitation15%
Record high74° (2021)
Record low6° (1967)
Sun, 0855° / 29°0.04
55 °
Thornton, Sunday, 8 November
Climate normal for this date — 60-year average.
Average high55°
Average low29°
Average precipitation0.04 in
Chance of precipitation25%
Record high73° (1978)
Record low9° (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, CO 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, CO 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.