Gateway Arch & Mississippi Riverfront, MO

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Gateway Arch St. Louis from Illinois
Gateway Arch St. Louis from Illinois Side - Mobilus In Mobili, CC BY-SA 2.0, via Wikimedia Commons

Today’s Forecast:

☁
64°F
High: 71° | Low: 61°
Current Temperature
Cloudy
Station: KCPS
Observed at: 5:45 pm CDT on 9/26/26
Wind: 0 mph | Humidity: 77%
This Afternoon:Mostly cloudy. High near 71, with temperatures falling to around 66 in the afternoon. East wind around 3 mph.
Tonight:Mostly cloudy, with a low around 61. East wind 0 to 3 mph.
Sunday:Mostly cloudy, with a high near 77. East wind around 3 mph.
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Today’s Report:

🚲 Biking

Excellent
  100 /100

Excellent for biking. High near 65°F. Low rain risk (2%).

  • Temp: Favorable conditions
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Excellent 100/100
Excellent for biking. High near 76°F. Low rain risk (9%).

About Gateway Arch & Mississippi Riverfront

This page connects the Arch landscape, levee promenade and completed downtown riverfront bicycle connection, where exposure and operating notices matter as much as the regional forecast.

Planning an Outing

A workable outing depends on Mississippi stage, levee closure, heat, wind, lightning and bicycle access. Match the forecast to the chosen access rather than assuming every component operates alike.

Destination-Specific Access

Ordinary monument-ground use is hidden walking, not hiking; do not add events or casual Mississippi River water activities.

Weather Tips

  • For this the Arch landscape, levee promenade and completed downtown riverfront bicycle connection, read the gauge trend and upstream rainfall because current and floating debris can change after local skies clear.
  • Within the Arch landscape, levee promenade and completed downtown riverfront bicycle connection, honor posted wet-trail closures and keep bicycles off hiking-only routes.

Nearby Towns and Areas

  • Gateway Arch
  • Luther Ely Smith Square
  • Mississippi River
  • Downtown St. Louis

Adjust the Day to the Forecast

Replace natural-surface riding with a paved route when trails are closed.

7-Day Forecast

☁
64°F
High: 71° | Low: 61°
Current Temperature
Cloudy
Station: KCPS
Observed at: 5:45 pm CDT on 9/26/26
Wind: 0 mph | Humidity: 77%
Sat ☁
71° 61°
11%
Sun ☁
77° 58°
9%
Mon ☀
78° 59°
1%
Tue ⛅
83° 67°
1%
Wed ⛈
81° 69°
46%
Thu 🌧
78° 65°
65%
Fri 🌧
74° 62°
53%

7-Day High Temperature Trend

71° Sat 77° Sun 78° Mon 83° Tue 81° Wed 78° Thu 74° Fri

7-Day Low Temperature Trend

61° Sat 58° Sun 59° Mon 67° Tue 69° Wed 65° Thu 62° Fri

📊 7-Day Outdoor Outlook

Good Fair Poor 100 Sat 85 Sun 80 Mon 20 Tue 18 Wed 16 Thu 94 Fri
Forecast data from the National Weather Service  |  Last Updated: September 26, 2026 6:46 pm CDT

Weather by Season

Winter

Cold spells make Mississippi stage more consequential, while a quick warmup can leave shaded ground icy and exposed ground soft.

Spring

New vegetation and saturated soil magnify lightning and bicycle access; wait for the posted reopening instead of testing a closed route.

Summer

The heat index and lightning and bicycle access deserve separate checks, especially when shade, water or rapid shelter is limited.

Fall

Cooler air improves comfort, but leaf cover and lightning and bicycle access can hide changing footing or access restrictions.

Key Climate Data Points

  • Local climate: This local planning area has an annual average temperature near 55–58°F, receives about 40–46 inches of precipitation and records typically 10–18 inches.
  • Wettest season: Spring and early summer.
  • Driest season: Late summer or early fall.
  • Annual average temperature: Near 55–58°f.
  • Annual snowfall: Typically 10–18 inches.