Big Sky, MT weather in July
In July, Big Sky sees highs around 78°F and lows around 41°F: mild, with frequent rain. Expect about 10 wet days. It is one of the warmest months in Big Sky. Great for outdoor plans.
- Normal high
- 78°F
- Normal low
- 41°F
- Wet days
- 10
- 1.3 in total
- Daylight
- 15.2 h
How July changes from start to finish
| July 1 | July 31 | |
|---|---|---|
| Normal high | 73°F | 80°F |
| Normal low | 39°F | 42°F |
| Chance of a wet day | 37% | 34% |
| Sunrise / sunset | 5:41 am / 9:17 pm | 6:09 am / 8:54 pm |
| Daylight | 15.6 h | 14.8 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 (temperature only: no humidity station nearby)17 of 31
- Hot dayshigh 90°F or more1 of 31
- Wet daysat least 0.01 in of rain or melted snow10 of 31
- Notable rainat least 0.10 in4 of 31
- Freezing nightslow 32°F or below1 of 31
Average days per July, counted from daily records for each year 1991-2020.
Rain in July
Normal precipitation is 1.3 in; a dry July brings about 1.0 in and a wet one about 1.5 in (25th and 75th percentiles). Days with half an inch or more are rare.
How July varies from year to year
- Warmest July, 1991-20202007: average high 85°F
- Coolest July1993: average high 66°F
- Highest reading95°F (July 13, 2002)
- Lowest reading27°F (July 13, 2010)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
July compared with June and August
| June | July | August | |
|---|---|---|---|
| Normal high | 67°F | 78°F | 77°F |
| Normal low | 36°F | 41°F | 39°F |
| Wet days | 14 | 10 | 11 |
| Comfortable days | 18 | 17 | 18 |
| Daylight | 15.6 h | 15.2 h | 14.1 h |
Highs change by +11°F from June and -1°F into August.
Nearby alternatives in July
- Warmer: Billings, MT143 mi · high 86°F · 8 wet days
- Drier: West Yellowstone, MT45 mi · high 79°F · 5 wet days
How Big Sky ranks in July
- Normal high339th warmest of 378 cities; 6th of 6 in Montana
- Wet days235th driest of 378
What to pack for Big Sky in July
- Layers – afternoons near 78°F but nights near 41°F
- A rain jacket or umbrella – rain on about 10 days
- Sunglasses and sunscreen – about 15.2 hours of daylight and highs near 78°F
Heating and cooling
July has 180 heating degree days and 7 cooling degree days (base 65°F), 2% of the year's total heating and cooling demand.
Questions
How hot is Big Sky in July?
The normal high is 78°F and the normal low is 41°F. From 1991 to 2020 the hottest July reading was 95°F (most recently on July 13, 2002).
Does it rain a lot in Big Sky in July?
About 10 days in July have at least 0.01 in of precipitation, and the normal total is 1.3 in.
Is July a good time to visit Big Sky?
July ranks 1st of 12 months on our comfort score for Big Sky (78 out of 100). It has about 17 comfortable days (judged by temperature only) and about 1 day at 90°F or hotter. The best months are June, July and September.
Where the numbers come from
- Temperature and rain: Big Sky 2WNW (USC00240775), 2.1 mi ESE of the city center, 6,590 ft (630 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Not available for this location: snowfall, snow depth, frost dates, humidity and wind by hour, cloud cover and daily humidity and wind (no station close enough or similar enough in elevation).