Early autumn · Weather & things to do
Jackson in September
Jackson cools off: highs slip to 70°F (21°C), from 80°F in August, with lows of 42°F (6°C) and about 1.8 in (46 mm) of rain.
At 95/100 for comfort (2nd of 12), it's one of the best months to visit.
- Avg high
- 70°F (21°C)
- Avg low
- 42°F (6°C)
- Rain
- 1.8 in (46 mm)
- Humidity
- 53%
- Cloud cover
- 44%
- Daylight
- ~12 h 17 min
- Comfort score
- 95/100 · Great
What September feels like
Highs near 70°F (21°C) make for comfortable sightseeing weather.
Mornings start much cooler: lows average 42°F (6°C), about 15°C (27°F) below the afternoon high.
About 1.8 in (46 mm) of rain falls in a typical year's September.
Plan around September
September is one of Jackson's best months on the climate data.
- Last of the best-scoring months: by October, the score drops to 69/100.
- Comfort holds steady from August (96 → 95/100).
- Our Grand Teton, Jackson & Yellowstone route recommends Mid-Dec – Mar, so September falls outside its suggested window.
What to pack for September
- A warm layer for eveningslows near 42°F
- Comfortable walking shoesmost picks involve some walking
What to do in Jackson in September
September is good outdoor weather here, so these picks lean toward the open air.
Jackson Hole Mountain Resort
Steep ski area above Teton Village with more than 4,000 feet of vertical and an aerial tram to Rendezvous Mountain.
Why now September scores 95/100 for comfort, good conditions for being outside.
National Elk Refuge
Refuge on the edge of Jackson where thousands of elk spend the winter on open, snowy meadows.
Why now Highs near 70°F and 1.8 in of monthly rain make this an easy outdoor pick.
Snow King Mountain
Jackson's town ski hill since 1939, rising straight from the edge of downtown, with night skiing.
Why now One to do outside while the weather is on your side.
Town Square
Jackson's central park, entered under four arches made of shed elk antlers that are strung with lights in winter.
National Museum of Wildlife Art
Museum of wildlife painting and sculpture built into a hillside directly across from the Elk Refuge.
Nearby in September
- Grand Teton National Park in September~22 mi · highs 65°F, 2.0 in rain · 2°C (4°F) cooler by day, about as wet
- Yellowstone National Park in September~67 mi · highs 61°F, 2.0 in rain · 5°C (9°F) cooler by day, about as wet
- Yellowstone in September~79 mi · highs 60°F, 2.0 in rain · 5°C (9°F) cooler by day, about as wet
- Salt Lake City in September~196 mi · highs 79°F, 1.5 in rain · 5°C (10°F) warmer by day, about as wet
NASA POWER 2001–2025 monthly averages on a ~50 km grid, temperatures adjusted from the grid cell's ~2,418 m to Jackson's ~1,883 m elevation (standard lapse rate). Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Jackson in September: quick answers
Is September a good time to visit Jackson?
Yes. On the climate data it's one of the best months, scoring 95/100. Expect highs of 70°F (21°C) and 1.8 in (46 mm) of rain. Our Grand Teton, Jackson & Yellowstone route recommends Mid-Dec – Mar, so September is outside its suggested window.
How hot is Jackson in September?
Average highs are 70°F (21°C) and average lows 42°F (6°C), making it the 4th-warmest month by daytime highs.
Does it rain a lot in Jackson in September?
Not much: about 1.8 in (46 mm) of rain falls across September on average, the 3rd-driest month of the year. The annual total is about 25.8 in (656 mm).
What should I pack for Jackson in September?
Bring a warm layer for evenings (lows near 42°F) and comfortable walking shoes (most picks involve some walking).
Planning Jackson in September?
Plan it together in TripsCircle: one itinerary, one shared packing list and costs split as you go.