Missoula weather in August: Missoula, Montana: normal highs, lows, rain and records for August
Missoula in August has a normal high of 84°F and a normal low of 50°F, a daily mean of 67°F, falling from 88°F on the 1st to 79°F by the 31st. Measurable precipitation falls on 6 days in a normal August, 0.83 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 10°C, 21 mm of precipitation in August.
- NOAA stationMissoula International Airport
- Station IDUSW00024153
- Location46.92°N 114.09°W
- Elevation3,192 ft (973 m)
- From the center4 miles
- Population78,204
- Jan 32° 18°
- Feb 37° 21°
- Mar 48° 27°
- Apr 56° 32°
- May 66° 40°
- Jun 73° 46°
- Jul 85° 52°
- Aug 84° 50°
- Sep 73° 42°
- Oct 56° 32°
- Nov 40° 25°
- Dec 31° 18°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Missoula in August?
The normal high is 84°F and the normal low 50°F, for a daily mean of 67.2°F. August is 1.2°F cooler than July and 9.7°F warmer than September. August is the 2nd warmest month of the year in Missoula and the 12th wettest. Across the month the normal high falls 9°F, from 88°F on August 1 to 79°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 65°F and 69°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 | 88°F | 53°F | 19% | 7% |
| August 8 | 87°F | 52°F | 19% | 8% |
| August 15 | 85°F | 51°F | 20% | 8% |
| August 22 | 82°F | 49°F | 21% | 9% |
| August 31 | 79°F | 47°F | 22% | 9% |
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 | 88°F | 53°F | 19% | 7% | 15 h |
| August 2 | 88°F | 53°F | 19% | 7% | 14 h 50 min |
| August 3 | 88°F | 53°F | 19% | 7% | 14 h 50 min |
| August 4 | 88°F | 52°F | 19% | 8% | 14 h 50 min |
| August 5 | 88°F | 52°F | 19% | 8% | 14 h 50 min |
| August 6 | 88°F | 52°F | 19% | 8% | 14 h 40 min |
| August 7 | 87°F | 52°F | 19% | 8% | 14 h 40 min |
| August 8 | 87°F | 52°F | 19% | 8% | 14 h 40 min |
| August 9 | 87°F | 52°F | 19% | 8% | 14 h 30 min |
| August 10 | 87°F | 52°F | 20% | 8% | 14 h 30 min |
| August 11 | 86°F | 51°F | 20% | 8% | 14 h 30 min |
| August 12 | 86°F | 51°F | 20% | 8% | 14 h 30 min |
| August 13 | 86°F | 51°F | 20% | 8% | 14 h 20 min |
| August 14 | 85°F | 51°F | 20% | 8% | 14 h 20 min |
| August 15 | 85°F | 51°F | 20% | 8% | 14 h 20 min |
| August 16 | 85°F | 50°F | 20% | 8% | 14 h 10 min |
| August 17 | 84°F | 50°F | 20% | 8% | 14 h 10 min |
| August 18 | 84°F | 50°F | 20% | 9% | 14 h 10 min |
| August 19 | 84°F | 50°F | 21% | 9% | 14 h 10 min |
| August 20 | 83°F | 49°F | 21% | 9% | 14 h |
| August 21 | 83°F | 49°F | 21% | 9% | 14 h |
| August 22 | 82°F | 49°F | 21% | 9% | 14 h |
| August 23 | 82°F | 49°F | 21% | 9% | 13 h 50 min |
| August 24 | 82°F | 49°F | 21% | 9% | 13 h 50 min |
| August 25 | 81°F | 48°F | 21% | 9% | 13 h 50 min |
| August 26 | 81°F | 48°F | 21% | 9% | 13 h 40 min |
| August 27 | 81°F | 48°F | 22% | 9% | 13 h 40 min |
| August 28 | 80°F | 48°F | 22% | 9% | 13 h 40 min |
| August 29 | 80°F | 47°F | 22% | 9% | 13 h 30 min |
| August 30 | 79°F | 47°F | 22% | 9% | 13 h 30 min |
| August 31 | 79°F | 47°F | 22% | 9% | 13 h 30 min |
- Normal high
- 84°FAugust average
- Normal low
- 50°FAugust average
- Precipitation
- 0.83 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 15 h to 13 h 30 minAugust 1 to August 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 24
- Sunshine
- 86%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00024153; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Missoula in August?
On a given August day the chance of 0.01 inch or more is 20% on average, highest around August 31 (22%). In all, 0.83 in falls on 6 days of a normal August.
In a normal August in Missoula, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00024153.
How humid and windy is Missoula in August?
At 3 p.m. the normal temperature is 78°F with 26% relative humidity and a dew point of 40°F; at 6 a.m. it is 49°F with 73% humidity. The wind averages 5.2 mph, most often from the west-northwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 49°F | 41°F | 73% | 2.2 mph | 75% |
| 9 a.m. | 58°F | 43°F | 56% | 2.9 mph | 74% |
| noon | 71°F | 42°F | 36% | 5.2 mph | 76% |
| 3 p.m. | 78°F | 40°F | 26% | 8.3 mph | 72% |
| 6 p.m. | 76°F | 40°F | 28% | 10.2 mph | 72% |
| 9 p.m. | 64°F | 41°F | 43% | 6.0 mph | 79% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00024153. 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 Missoula?
The warmest August temperature on Missoula's official record (since 1893) is 105°F, on August 4, 1961; the coldest is 29°F, on August 25, 1910. The wettest August brought 3.29 in (1985).
The August mean against the 1991-2020 normal of 67.2°F: 2021 67.2°F (at normal), 2022 73.8°F (+6.6), 2023 70.6°F (+3.4), 2024 68.6°F (+1.4), 2025 69.1°F (+1.9), 2026 68.4°F (+1.2). 5 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 67.2°F | at normal | 1.55 in |
| 2022 | 73.8°F | +6.6°F | 0.11 in |
| 2023 | 70.6°F | +3.4°F | 2.35 in |
| 2024 | 68.6°F | +1.4°F | 0.55 in |
| 2025 | 69.1°F | +1.9°F | 0.92 in |
| 2026 | 68.4°F | +1.2°F | 0.55 in |
Source: records: ACIS, NWS threaded record MSOthr; recent months: ACIS, station USW00024153. Records and recent months use complete months only.
How does August in Missoula compare across Montana?
Across the 141 places PlainClimate covers in Montana, August normal highs run from 71°F in Cooke City to 90°F in Hardin; Missoula's is 84°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.