Thornton, CO weather in August
In August, Thornton sees highs around 88°F and lows around 57°F: hot, with some rain. Expect about 8 wet days. It is one of the warmest months in Thornton.
- Normal high
- 88°F
- Normal low
- 57°F
- Wet days
- 8
- 1.3 in total
- Muggy days
- 0
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 90°F | 85°F |
| Normal low | 60°F | 54°F |
| Chance of a wet day | 26% | 21% |
| Sunrise / sunset | 5:58 am / 8:13 pm | 6:27 am / 7:33 pm |
| Daylight | 14.3 h | 13.1 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical August day
- 6 am60°Fdew point 49°F
- 9 am73°Fdew point 48°F
- Noon82°Fdew point 44°F
- 3 pm83°Fdew point 44°F
- 6 pm76°Fdew point 47°F
- 9 pm68°Fdew point 49°F
NOAA hourly normals (local standard time) from Aurora Buckley Fld ANGB (16 mi away); average wind 8 mph; clear or few clouds in 38% of daytime hours, mostly cloudy or overcast in 38%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F5 of 31
- Hot dayshigh 90°F or more13 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow8 of 31
- Notable rainat least 0.10 in3 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 1.3 in; a dry August brings about 0.6 in and a wet one about 1.8 in (25th and 75th percentiles). About 1 day brings half an inch or more.
How August varies from year to year
- Warmest August, 1991-20202020: average high 93°F
- Coolest August2004: average high 82°F
- Wettest August2008: 3.6 in
- Driest August2012: 0.2 in
- Highest reading102°F (August 2, 2008)
- Lowest reading43°F (August 29, 2004)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 90°F | 88°F | 80°F |
| Normal low | 59°F | 57°F | 48°F |
| Wet days | 7 | 8 | 6 |
| Comfortable days | 3 | 5 | 11 |
| Daylight | 14.7 h | 13.7 h | 12.4 h |
Highs change by -2°F from July and -8°F into September.
Nearby alternatives in August
- Cooler: Highlands Ranch, CO22 mi · high 83°F · 10 wet days
How Thornton ranks in August
- Normal high167th warmest of 378 cities; 4th of 17 in Colorado
- Wet days146th driest of 378
- Comfortable days137th most of 341
What to pack for Thornton in August
- Light, breathable clothing – highs near 88°F
- Layers – afternoons near 88°F but nights near 57°F
Heating and cooling
August has 10 heating degree days and 244 cooling degree days (base 65°F), 4% of the year's total heating and cooling demand.
Questions
How hot is Thornton in August?
The normal high is 88°F and the normal low is 57°F. From 1991 to 2020 the hottest August reading was 102°F (most recently on August 2, 2008).
Does it rain a lot in Thornton in August?
About 8 days in August have at least 0.01 in of precipitation, and the normal total is 1.3 in. The wettest August in 1991-2020 was in 2008 (3.6 in); the driest was in 2012 (0.2 in).
Is August a good time to visit Thornton?
August ranks 8th of 12 months on our comfort score for Thornton (52 out of 100). It has about 5 comfortable days and about 13 days at 90°F or hotter. The best month is May.
Where the numbers come from
- Temperature, snowfall and snow depth: Denver-Stapleton (USW00023062), 9.1 mi SE of the city center, 5,286 ft (61 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain and frost dates: Northglenn (USC00055984), 3.1 mi NW of the city center, 5,407 ft (60 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Aurora Buckley Fld ANGB (USW00023036), 16 mi SE of the city center, 5,663 ft (316 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Denver International Airport (725650-03017), 17 mi E of the city center, 5,404 ft (57 ft higher than the city). Hourly observations, 1991-2020.