Missoula, MT weather in August
Expect warm weather with some rain in Missoula in August, with highs near 84°F and lows near 50°F. Rain falls on about 6 days. It is one of the warmest months in Missoula.
- Normal high
- 84°F
- Normal low
- 50°F
- Wet days
- 6
- 0.8 in total
- Muggy days
- 0
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 88°F | 79°F |
| Normal low | 53°F | 47°F |
| Chance of a wet day | 19% | 22% |
| Sunrise / sunset | 6:15 am / 9:08 pm | 6:54 am / 8:18 pm |
| Daylight | 14.9 h | 13.4 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 am52°Fdew point 43°F
- 9 am63°Fdew point 45°F
- Noon75°Fdew point 44°F
- 3 pm82°Fdew point 41°F
- 6 pm80°Fdew point 41°F
- 9 pm69°Fdew point 43°F
NOAA hourly normals (local standard time) from Missoula Intl Airport (6 mi away); average wind 6 mph.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F7 of 31
- Hot dayshigh 90°F or more11 of 31
- Muggy daysdaily mean dew point 65°F or more0 of 31
- Wet daysat least 0.01 in of rain or melted snow6 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 0.8 in; a dry August brings about 0.3 in and a wet one about 1.2 in (25th and 75th percentiles). Days with half an inch or more are rare.
How August varies from year to year
- Warmest August, 1991-20201994: average high 90°F
- Coolest August1993: average high 79°F
- Wettest August2009: 3.1 in
- Driest August2001: 0.09 in
- Highest reading104°F (August 10, 2018)
- Lowest reading30°F (August 25, 1992)
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 | 85°F | 84°F | 73°F |
| Normal low | 52°F | 50°F | 42°F |
| Wet days | 6 | 6 | 7 |
| Comfortable days | 7 | 7 | 14 |
| Daylight | 15.4 h | 14.2 h | 12.6 h |
Highs change by -1°F from July and -11°F into September.
Nearby alternatives in August
- Warmer: Boise, ID249 mi · high 91°F · 2 wet days
- Drier: Spokane, WA170 mi · high 84°F · 3 wet days
- Cooler: Big Sky, MT167 mi · high 77°F · 11 wet days
How Missoula ranks in August
- Normal high222nd warmest of 378 cities; 2nd of 6 in Montana
- Wet days126th driest of 378
- Comfortable days100th most of 341
What to pack for Missoula in August
- Layers – afternoons near 84°F but nights near 50°F
- Sunglasses and sunscreen – about 14.2 hours of daylight and highs near 84°F
Heating and cooling
August has 47 heating degree days and 115 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is Missoula in August?
The normal high is 84°F and the normal low is 50°F. From 1991 to 2020 the hottest August reading was 104°F (August 10, 2018).
Does it rain a lot in Missoula in August?
About 6 days in August have at least 0.01 in of precipitation, and the normal total is 0.8 in. The wettest August in 1991-2020 was in 2009 (3.1 in); the driest was in 2001 (0.09 in).
Is August a good time to visit Missoula?
August ranks 6th of 12 months on our comfort score for Missoula (58 out of 100). It has about 7 comfortable days and about 11 days at 90°F or hotter. The best months are May and June.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and humidity and wind by hour: Missoula Intl Airport (USW00024153), 5.7 mi NW of the city center, 3,192 ft . NOAA normals and daily records, 1991-2020.
- Frost dates: Missoula 2 Ne (USC00245735), 2.2 mi NE of the city center, 3,420 ft (212 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Missoula International Airport (727730-24153), 5.8 mi NW of the city center, 3,195 ft . Hourly observations, 1991-2020.
- Not available for this location: cloud cover (no station close enough or similar enough in elevation).