Late summer · Weather & things to do
Downtown St. Louis & the Arch in August
Little changes in Downtown St. Louis & the Arch from July: highs stay near 87°F (31°C), lows near 67°F (19°C), and about 3.7 in (93 mm) of rain falls.
It scores 72/100 for comfort, 6th of 12, which makes it a solid shoulder-season month.
- Avg high
- 87°F (31°C)
- Avg low
- 67°F (19°C)
- Rain
- 3.7 in (93 mm)
- Humidity
- 71%
- Cloud cover
- 47%
- Daylight
- ~13 h 30 min
- Comfort score
- 72/100 · Good
What August feels like
Afternoons run hot at about 87°F (31°C), which leaves mornings and evenings as the time for walking.
After dark, temperatures fall to about 67°F (19°C).
Some rain is likely, about 3.7 in (93 mm) in the month, so pack for a shower or two.
Plan around August
August is shoulder season: good weather, a step below the best months (September & October).
- Comfort improves from 68/100 in July to 72/100.
- Our St. Louis New Year's Eve route is planned for Dec 30 – Jan 1, a window set by the holiday season rather than the weather — August falls outside it.
What to pack for August
- Light, breathable clothes87°F afternoons
- Sunscreen, sunglasses and a hatstrong sun this month
- Refillable water bottleeasy to dehydrate in the heat
- Packable rain jacket or umbrellaabout 3.7 in of rain
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Downtown St. Louis & the Arch in August
Afternoons run hot (87°F), so these picks mix early-start outdoor spots with cool indoor breaks.
Grand Hall at Union Station
Barrel-vaulted 1894 lobby of the old train station, now a bar with a light show projected on the ceiling.
Why now A break from 87°F afternoons.
Crown Candy Kitchen
Soda fountain open since 1913 in Old North St. Louis, known for BLTs, malts and house-made chocolates.
Why now Somewhere to sit out the hottest hours.
Kiener Plaza
Downtown plaza facing the Old Courthouse and the Arch, home of the free Winterfest Neon Nights party on Dec 31.
Why now August scores 72/100 for comfort, good conditions for being outside.
City Museum
Old shoe warehouse turned into a playground of caves, slides, tunnels and rooftop climbs built from salvaged parts.
Nearby in August
- Springfield in August~195 mi · highs 88°F, 4.1 in rain · similar daytime temperatures, about as wet
- Branson in August~215 mi · highs 91°F, 3.7 in rain · 2°C (4°F) warmer by day, about as wet
- Indianapolis in August~230 mi · highs 83°F, 3.7 in rain · 2°C (4°F) cooler by day, about as wet
- Broad Ripple in August~233 mi · highs 83°F, 3.7 in rain · 2°C (4°F) cooler by day, about as wet
These averages also cover Forest Park & the Central West End.
NASA POWER 2001–2025 monthly averages on a ~50 km grid. Comfort scores weigh temperature, rain, humidity and cloud: see how we score each month. Check a forecast before you go.
Downtown St. Louis & the Arch in August: quick answers
Is August a good time to visit Downtown St. Louis & the Arch?
It's a good shoulder-season choice, scoring 72/100 against a best of 90 in September & October. Expect highs of 87°F (31°C) and 3.7 in (93 mm) of rain.
How hot is Downtown St. Louis & the Arch in August?
Average highs are 87°F (31°C) and average lows 67°F (19°C), making it the 2nd-warmest month by daytime highs.
Does it rain a lot in Downtown St. Louis & the Arch in August?
Some: about 3.7 in (93 mm) of rain falls across August on average, the 6th-driest month of the year. The annual total is about 43.5 in (1106 mm).
What should I pack for Downtown St. Louis & the Arch in August?
Bring light, breathable clothes (87°F afternoons), sunscreen, sunglasses and a hat (strong sun this month), refillable water bottle (easy to dehydrate in the heat), packable rain jacket or umbrella (about 3.7 in of rain) and comfortable walking shoes (most places below are best reached on foot or with short walks).
More on Downtown St. Louis & the Arch
Planning Downtown St. Louis & the Arch in August?
Share this August plan with your group, poll everyone on dates and keep the packing list in one place.