Best time to visit Grand Teton National Park
The best time to visit Grand Teton National Park is June–September, judged on twenty years of weather records and the events worth going for.
Grand Teton National Park, Wyoming, United States
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | -4.2 °C / 24 °F | -12.1 °C / 10 °F | 77 mm / 3 in | neither best nor good |
| February | -2.4 °C / 28 °F | -10.2 °C / 14 °F | 82 mm / 3.2 in | neither best nor good |
| March | 2.4 °C / 36 °F | -6.7 °C / 20 °F | 85 mm / 3.3 in | neither best nor good |
| April | 5.5 °C / 42 °F | -4.5 °C / 24 °F | 81 mm / 3.2 in | neither best nor good |
| May | 10.4 °C / 51 °F | -1.9 °C / 29 °F | 70 mm / 2.7 in | neither best nor good |
| June | 18.4 °C / 65 °F | 3.2 °C / 38 °F | 59 mm / 2.3 in | best month |
| July | 24.4 °C / 76 °F | 7.2 °C / 45 °F | 27 mm / 1.1 in | best month |
| August | 23 °C / 73 °F | 6.6 °C / 44 °F | 42 mm / 1.7 in | best month |
| September | 18.1 °C / 65 °F | 2.8 °C / 37 °F | 54 mm / 2.1 in | best month |
| October | 8.7 °C / 48 °F | -3 °C / 27 °F | 74 mm / 2.9 in | neither best nor good |
| November | 1 °C / 34 °F | -8.9 °C / 16 °F | 73 mm / 2.9 in | neither best nor good |
| December | -4 °C / 25 °F | -11.7 °C / 11 °F | 88 mm / 3.5 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- June–September
Why these months
June · best
In its favour: feels like (high) 16.5 °C / 62 °F, average daily high 18.4 °C / 65 °F, precipitation 59 mm / 2.3 in, share of daylight that is sunny 89%, days with heavy rain 1.5 days, relative humidity 61%, wet days 10.9 days.
Against: average daily low 3.2 °C / 38 °F.
July · best
In its favour: feels like (high) 22.7 °C / 73 °F, average daily high 24.4 °C / 76 °F, precipitation 27 mm / 1.1 in, share of daylight that is sunny 95%, days with heavy rain 0.3 days, wet days 7.5 days, relative humidity 51%, average daily low 7.2 °C / 45 °F.
August · best
In its favour: feels like (high) 20.9 °C / 70 °F, average daily high 23 °C / 73 °F, precipitation 42 mm / 1.7 in, share of daylight that is sunny 91%, days with heavy rain 1 days, wet days 8.5 days, relative humidity 52%, average daily low 6.6 °C / 44 °F.
September · best
In its favour: feels like (high) 15.2 °C / 59 °F, average daily high 18.1 °C / 65 °F, precipitation 54 mm / 2.1 in, share of daylight that is sunny 89%, days with heavy rain 1.9 days, wet days 8 days, relative humidity 59%.
Against: average daily low 2.8 °C / 37 °F.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- June–September
- Good
- May
Why these months
May · good
In its favour: precipitation 70 mm / 2.7 in, average daily high 10.4 °C / 51 °F, days with heavy rain 1.5 days, share of daylight that is sunny 85%, daylight per day 14.8 h, feels like (high) 8.2 °C / 47 °F, wind (daily max) 12 km/h / 7 mph.
Against: wet days 13.4 days, average daily low -1.9 °C / 29 °F.
June · best
In its favour: average daily high 18.4 °C / 65 °F, precipitation 59 mm / 2.3 in, days with heavy rain 1.5 days, feels like (high) 16.5 °C / 62 °F, share of daylight that is sunny 89%, daylight per day 15.4 h, average daily low 3.2 °C / 38 °F, wet days 10.9 days, wind (daily max) 14 km/h / 9 mph.
July · best
In its favour: precipitation 27 mm / 1.1 in, days with heavy rain 0.3 days, average daily high 24.4 °C / 76 °F, wet days 7.5 days, average daily low 7.2 °C / 45 °F, share of daylight that is sunny 95%, daylight per day 15.1 h, feels like (high) 22.7 °C / 73 °F, wind (daily max) 14 km/h / 8 mph.
August · best
In its favour: average daily high 23 °C / 73 °F, precipitation 42 mm / 1.7 in, days with heavy rain 1 days, wet days 8.5 days, feels like (high) 20.9 °C / 70 °F, average daily low 6.6 °C / 44 °F, share of daylight that is sunny 91%, daylight per day 13.9 h, wind (daily max) 13 km/h / 8 mph.
September · best
In its favour: average daily high 18.1 °C / 65 °F, precipitation 54 mm / 2.1 in, wet days 8 days, days with heavy rain 1.9 days, feels like (high) 15.2 °C / 59 °F, share of daylight that is sunny 89%, daylight per day 12.5 h, average daily low 2.8 °C / 37 °F, wind (daily max) 13 km/h / 8 mph.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Grand Targhee Resort, 19 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | -8.3 °C | -6.7 °C | -1.5 °C | 2.2 °C | 8.2 °C | 16.5 °C | 22.7 °C | 20.9 °C | 15.2 °C | 5.1 °C | -2.9 °C | -8.1 °C |
| Days with heavy rain | 1.9 days | 2.3 days | 1.8 days | 2 days | 1.5 days | 1.5 days | 0.3 days | 1 days | 1.9 days | 2.1 days | 2.1 days | 2.6 days |
| Time rain usually falls | 6 am | 4 pm | 5 pm | 6 pm | 5 pm | 5 pm | 5 pm | 4 pm | 4 pm | 5 pm | 8 am | 4 pm |
| Sunshine per day | 6.4 h | 7.5 h | 9.5 h | 11.2 h | 12.5 h | 13.7 h | 14.3 h | 12.7 h | 11.1 h | 9 h | 6.9 h | 5.6 h |
| Relative humidity | 78% | 76% | 71% | 70% | 71% | 61% | 51% | 52% | 59% | 72% | 80% | 81% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 2.9 µg/m³ | 4.9 µg/m³ | 7.3 µg/m³ | 8.7 µg/m³ | 8.5 µg/m³ | 7.2 µg/m³ | 7.3 µg/m³ | 6.7 µg/m³ | 6 µg/m³ | 4.1 µg/m³ | 3.8 µg/m³ | 3 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 5.2 µg/m³ | 8.5 µg/m³ | 12.2 µg/m³ | 13.1 µg/m³ | 13.1 µg/m³ | 10.9 µg/m³ | 11 µg/m³ | 10.3 µg/m³ | 9.7 µg/m³ | 7.7 µg/m³ | 6.8 µg/m³ | 5.6 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.