West Yellowstone, MT weather in August
Expect mild, mostly dry weather in West Yellowstone in August, with highs near 78°F and lows near 43°F. Rain falls on about 6 days. It is one of the warmest months in West Yellowstone. Great for outdoor plans.
- Normal high
- 78°F
- Normal low
- 43°F
- Wet days
- 6
- 1.2 in total
- Muggy days
- 0
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 81°F | 74°F |
| Normal low | 46°F | 41°F |
| Chance of a wet day | 17% | 20% |
| Sunrise / sunset | 6:10 am / 8:50 pm | 6:45 am / 8:03 pm |
| Daylight | 14.7 h | 13.3 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F18 of 31
- Hot dayshigh 90°F or more1 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 in6 of 31
- Freezing nightslow 32°F or below1 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 1.2 in; a dry August brings about 0.5 in and a wet one about 1.6 in (25th and 75th percentiles). About 1 day brings half an inch or more. Snow is very rare.
How August varies from year to year
- Warmest August, 1991-20202003: average high 84°F
- Coolest August1993: average high 71°F
- Wettest August2014: 3.9 in
- Driest August2008: no measurable precipitation
- Highest reading94°F (August 11, 2018)
- Lowest reading28°F (August 26, 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 | 79°F | 78°F | 68°F |
| Normal low | 45°F | 43°F | 37°F |
| Wet days | 5 | 6 | 7 |
| Comfortable days | 17 | 18 | 18 |
| Daylight | 15.2 h | 14.0 h | 12.5 h |
Highs change by -1°F from July and -10°F into September.
Nearby alternatives in August
- Warmer: Billings, MT148 mi · high 85°F · 6 wet days
How West Yellowstone ranks in August
- Normal high330th warmest of 378 cities; 5th of 6 in Montana
- Wet days113th driest of 378
- Comfortable days20th most of 341
What to pack for West Yellowstone in August
- Layers – afternoons near 78°F but nights near 43°F
- Sunglasses and sunscreen – about 14.0 hours of daylight and highs near 78°F
Heating and cooling
August has 144 heating degree days and 11 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is West Yellowstone in August?
The normal high is 78°F and the normal low is 43°F. From 1991 to 2020 the hottest August reading was 94°F (most recently on August 11, 2018).
Does it rain a lot in West Yellowstone in August?
About 6 days in August have at least 0.01 in of precipitation, and the normal total is 1.2 in. The wettest August in 1991-2020 was in 2014 (3.9 in); the driest was in 2008, with no measurable precipitation.
Is August a good time to visit West Yellowstone?
August ranks 3rd of 12 months on our comfort score for West Yellowstone (75 out of 100). It has about 18 comfortable days and about 1 day at 90°F or hotter. The best months are June, July and August.
Where the numbers come from
- Temperature, snowfall, snow depth and frost dates: Hebgen Dam (USC00244038), 18 mi NW of the city center, 6,489 ft (178 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain: Whiskey Creek (USS0011E30S), 4.2 mi SSW of the city center, 6,800 ft (133 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Yellowstone (726664-94173), 35 mi ESE of the city center, 7,782 ft (1,115 ft higher than the city). Hourly observations, 1991-2020.
- Not available for this location: humidity and wind by hour and cloud cover (no station close enough or similar enough in elevation).