Grand Junction weather in August: Grand Junction, Colorado: normal highs, lows, rain and records for August
Grand Junction in August has a normal high of 91°F and a normal low of 62°F, a daily mean of 76°F, falling from 94°F on the 1st to 88°F by the 31st. Measurable precipitation falls on 7 days in a normal August, 0.92 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 16°C, 23 mm of precipitation in August.
- NOAA stationGrand Junction Walker Field
- Station IDUSW00023066
- Location39.13°N 108.54°W
- Elevation4,858 ft (1,481 m)
- From the center3 miles
- Population70,554
- Jan 38° 17°
- Feb 46° 24°
- Mar 58° 32°
- Apr 66° 38°
- May 77° 47°
- Jun 89° 57°
- Jul 95° 64°
- Aug 91° 62°
- Sep 82° 53°
- Oct 67° 40°
- Nov 52° 28°
- Dec 39° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Grand Junction in August?
The normal high is 91°F and the normal low 62°F, for a daily mean of 76.3°F. August is 2.9°F cooler than July and 9.2°F warmer than September. August is the 2nd warmest month of the year in Grand Junction and the 4th wettest. Across the month the normal high falls 6°F, from 94°F on August 1 to 88°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 74°F and 78°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 22%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 94°F | 64°F | 19% | 7% |
| August 8 | 93°F | 63°F | 20% | 8% |
| August 15 | 91°F | 62°F | 20% | 8% |
| August 22 | 90°F | 61°F | 21% | 9% |
| August 31 | 88°F | 58°F | 22% | 10% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 94°F | 64°F | 19% | 7% | 14 h 10 min |
| August 2 | 94°F | 64°F | 19% | 8% | 14 h 10 min |
| August 3 | 93°F | 64°F | 19% | 8% | 14 h 10 min |
| August 4 | 93°F | 64°F | 19% | 8% | 14 h 10 min |
| August 5 | 93°F | 64°F | 20% | 8% | 14 h 10 min |
| August 6 | 93°F | 64°F | 20% | 8% | 14 h |
| August 7 | 93°F | 64°F | 20% | 8% | 14 h |
| August 8 | 93°F | 63°F | 20% | 8% | 14 h |
| August 9 | 92°F | 63°F | 20% | 8% | 14 h |
| August 10 | 92°F | 63°F | 20% | 8% | 14 h |
| August 11 | 92°F | 63°F | 20% | 8% | 13 h 50 min |
| August 12 | 92°F | 63°F | 20% | 8% | 13 h 50 min |
| August 13 | 92°F | 62°F | 20% | 8% | 13 h 50 min |
| August 14 | 91°F | 62°F | 20% | 8% | 13 h 50 min |
| August 15 | 91°F | 62°F | 20% | 8% | 13 h 40 min |
| August 16 | 91°F | 62°F | 20% | 8% | 13 h 40 min |
| August 17 | 91°F | 62°F | 21% | 9% | 13 h 40 min |
| August 18 | 91°F | 61°F | 21% | 9% | 13 h 40 min |
| August 19 | 90°F | 61°F | 21% | 9% | 13 h 40 min |
| August 20 | 90°F | 61°F | 21% | 9% | 13 h 30 min |
| August 21 | 90°F | 61°F | 21% | 9% | 13 h 30 min |
| August 22 | 90°F | 61°F | 21% | 9% | 13 h 30 min |
| August 23 | 90°F | 60°F | 21% | 9% | 13 h 30 min |
| August 24 | 89°F | 60°F | 22% | 10% | 13 h 20 min |
| August 25 | 89°F | 60°F | 22% | 10% | 13 h 20 min |
| August 26 | 89°F | 59°F | 22% | 10% | 13 h 20 min |
| August 27 | 89°F | 59°F | 22% | 10% | 13 h 20 min |
| August 28 | 88°F | 59°F | 22% | 10% | 13 h 10 min |
| August 29 | 88°F | 59°F | 22% | 10% | 13 h 10 min |
| August 30 | 88°F | 58°F | 22% | 10% | 13 h 10 min |
| August 31 | 88°F | 58°F | 22% | 10% | 13 h 10 min |
- Normal high
- 91°FAugust average
- Normal low
- 62°FAugust average
- Precipitation
- 0.92 inmonth total
- Days with precipitation
- 70.01 inch or more
- Days at 90°F or more
- 20
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 30
- Sunshine
- 84%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00023066; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Grand Junction in August?
On a given August day the chance of 0.01 inch or more is 21% on average, highest around August 29 (22%). In all, 0.92 in falls on 7 days of a normal August.
In a normal August in Grand Junction, 20 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00023066.
How humid and windy is Grand Junction in August?
At 3 p.m. the normal temperature is 86°F with 20% relative humidity and a dew point of 41°F; at 6 a.m. it is 62°F with 51% humidity. The wind averages 8.6 mph, most often from the west in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 62°F | 43°F | 51% | 8.5 mph | 77% |
| 9 a.m. | 73°F | 44°F | 36% | 9.4 mph | 81% |
| noon | 82°F | 43°F | 26% | 6.9 mph | 77% |
| 3 p.m. | 86°F | 41°F | 20% | 9.8 mph | 75% |
| 6 p.m. | 83°F | 41°F | 23% | 9.1 mph | 73% |
| 9 p.m. | 72°F | 41°F | 33% | 7.9 mph | 78% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00023066. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Grand Junction?
The warmest August temperature on Grand Junction's official record (since 1893) is 105°F, on August 3, 2026; the coldest is 43°F, on August 23, 1968. The wettest August brought 3.65 in (1921).
The August mean against the 1991-2020 normal of 76.3°F: 2021 76.5°F (+0.2), 2022 78.9°F (+2.6), 2023 79.2°F (+2.9), 2024 78.7°F (+2.4), 2025 78.6°F (+2.3), 2026 80.6°F (+4.3). 6 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 76.5°F | +0.2°F | 1.55 in |
| 2022 | 78.9°F | +2.6°F | 0.43 in |
| 2023 | 79.2°F | +2.9°F | 1.27 in |
| 2024 | 78.7°F | +2.4°F | 1.62 in |
| 2025 | 78.6°F | +2.3°F | 0.31 in |
| 2026 | 80.6°F | +4.3°F | 0.53 in |
Source: records: ACIS, NWS threaded record GJTthr; recent months: ACIS, station USW00023066. Records and recent months use complete months only.
How does August in Grand Junction compare across Colorado?
Across the 125 places PlainClimate covers in Colorado, August normal highs run from 68°F in Leadville to 93°F in Lamar; Grand Junction's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- Grand Junction in July95°F by day, 64°F at night
- Grand Junction in September82°F by day, 53°F at night
- Grand Junction through the yearEvery month, frost dates, records and recent years
- Colorado in AugustThe statewide normal and the warmest and coolest places
- Lamar: Colorado's warmest Augustnormal high 93°F