As of 00:26 MDT

Thornton, CO weather in September

77°

Thornton, Sunday, 9 August, 00:26

Partly cloudy. Feels like 75°. High 95°, low 66°.

Pressure29.85 inHg

Wind1 mph N

Humidity26%

Visibility6.2 mi

Dew point38°

See detailed hourly forecast

In September, Thornton, CO averages a high of 76.3° and a low of 49.9°. About 1.5 inches of precipitation fall over the month (7 wet days). The record high is 98.1° (2020) and the record low 13.3° (1985). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	82°	55.2°	20%	96.6° (2023)	45° (1965)
2	81.7°	55°	22%	97.5° (2019)	41.2° (1974)
3	82°	55°	15%	93° (2017)	37.6° (1961)
4	81.7°	54.3°	15%	94.3° (2022)	40.5° (1961)
5	81.9°	54.7°	17%	98.1° (2020)	42.3° (1968)
6	81.5°	54.9°	15%	97.9° (2020)	44.6° (1968)
7	80.1°	54.3°	18%	96.6° (2022)	46.6° (1986)
8	79.7°	52.7°	27%	97° (2022)	34.3° (2020)
9	78.6°	52.7°	25%	94.3° (2021)	31.8° (2020)
10	78.4°	52.7°	27%	96.4° (2021)	33.1° (2020)
11	77.2°	52.2°	30%	96.4° (2021)	37.8° (2020)
12	75.2°	51.3°	33%	92.1° (2018)	34.2° (1974)
13	75.6°	50.2°	37%	92.7° (2018)	33.6° (1989)
14	75.6°	49.6°	25%	89.4° (2018)	32.2° (1993)
15	75.4°	49.8°	22%	92.3° (2018)	37° (1979)
16	76.1°	49.6°	22%	91.2° (2021)	32.9° (1965)
17	75.7°	49.1°	18%	90.3° (2000)	29.3° (1965)
18	75.6°	48.4°	18%	91.8° (2021)	27.9° (1971)
19	75.4°	48.9°	20%	89.8° (2010)	14° (1971)
20	73.9°	48.2°	20%	92.1° (2022)	23° (1971)
21	72°	46.9°	32%	88° (2017)	26.4° (1965)
22	71.1°	45.9°	30%	86° (2007)	15.4° (1995)
23	72.3°	46.4°	18%	85.3° (2016)	27.1° (1971)
24	72.3°	46°	17%	89.8° (2020)	28.9° (1965)
25	72.9°	45.1°	22%	90.1° (2020)	22.1° (2000)
26	74.3°	45.7°	17%	89.6° (2020)	19.9° (1970)
27	73°	45.7°	17%	87.3° (2021)	22.8° (1996)
28	72°	45.5°	17%	88.2° (2024)	29.1° (1985)
29	73°	45.7°	18%	90.3° (2024)	16.2° (1999)
30	72°	45.9°	17%	88.2° (2023)	13.3° (1985)