Mid-spring · Weather & things to do
Downtown St. Louis & the Arch in April
Downtown St. Louis & the Arch warms up: highs climb to 67°F (20°C), from 55°F in March, with lows of 45°F (7°C) and about 4.8 in (121 mm) of rain.
It scores 81/100 for comfort, 3rd of 12, which makes it a solid shoulder-season month.
- Avg high
- 67°F (20°C)
- Avg low
- 45°F (7°C)
- Rain
- 4.8 in (121 mm)
- Humidity
- 76%
- Cloud cover
- 57%
- Daylight
- ~13 h 01 min
- Comfort score
- 81/100 · Great
What April feels like
Highs near 67°F (20°C) make for comfortable sightseeing weather.
Mornings start much cooler: lows average 45°F (7°C), about 13°C (23°F) below the afternoon high.
Rain is a real factor, with about 4.8 in (121 mm) across the month.
Plan around April
April is shoulder season: good weather, a step below the best months (September & October).
- Start of the wettest three-month stretch (April – June), which brings about 14.1 in (358 mm) in total.
- Comfort improves from 67/100 in March to 81/100.
- 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 — April falls outside it.
What to pack for April
- A warm layer for eveningslows near 45°F
- Rain jacket and waterproof shoes4.8 in of rain on average
- Comfortable walking shoesmost places below are best reached on foot or with short walks
What to do in Downtown St. Louis & the Arch in April
Wet days call for a roof: these picks favor sit-down and indoor stops, plus a few for drier spells.
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 sit-down stop to wait out showers in a month with 4.8 in of rain.
Crown Candy Kitchen
Soda fountain open since 1913 in Old North St. Louis, known for BLTs, malts and house-made chocolates.
Why now Easy to slot in when April's rain moves in.
City Museum
Old shoe warehouse turned into a playground of caves, slides, tunnels and rooftop climbs built from salvaged parts.
Why now An indoor-leaning stop for a month with 4.8 in of rain.
Gateway Arch National Park
The 630-foot steel arch on the riverfront, with a tram to an observation room at the top and a museum below.
Why now A good rainy-day backup in April.
Nearby in April
- Springfield in April~195 mi · highs 67°F, 5.4 in rain · similar daytime temperatures, wetter
- Branson in April~215 mi · highs 69°F, 5.3 in rain · 1°C (2°F) warmer by day, about as wet
- Indianapolis in April~230 mi · highs 63°F, 4.4 in rain · 2°C (4°F) cooler by day, about as wet
- Broad Ripple in April~233 mi · highs 63°F, 4.4 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 April: quick answers
Is April a good time to visit Downtown St. Louis & the Arch?
It's a good shoulder-season choice, scoring 81/100 against a best of 90 in September & October. Expect highs of 67°F (20°C) and 4.8 in (121 mm) of rain.
How hot is Downtown St. Louis & the Arch in April?
Average highs are 67°F (20°C) and average lows 45°F (7°C), making it the 6th-coldest month by daytime highs.
Does it rain a lot in Downtown St. Louis & the Arch in April?
Yes: about 4.8 in (121 mm) of rain falls across April on average, the 2nd-wettest 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 April?
Bring a warm layer for evenings (lows near 45°F), rain jacket and waterproof shoes (4.8 in of rain on average) 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 April?
Bring the crew into one shared trip: vote on dates, build the day-by-day plan, split costs and share one packing list.