Gateway Arch National Park Climate and Average Weather
Climate of Gateway Arch National Park: average temperatures, rainfall and seasons month by month.
Climate in Gateway Arch National Park month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 36° | 22° | 2,9 in | ★★☆☆☆ |
| February | 49° | 30° | 1,4 in | ★★★☆☆ |
| March | 63° | 42° | 4,1 in | ★★★☆☆ |
| April | 69° | 51° | 7,1 in | ★★★☆☆ |
| May | 76° | 58° | 6,0 in | ★★★★☆ |
| June | 86° | 68° | 5,9 in | ★★★★☆ |
| July | 88° | 72° | 5,4 in | ★★★★☆ |
| August | 86° | 69° | 1,9 in | ★★★★☆ |
| September | 82° | 63° | 2,8 in | ★★★★☆ |
| October | 71° | 52° | 1,9 in | ★★★★☆ |
| November | 56° | 40° | 3,3 in | ★★★☆☆ |
| December | 47° | 32° | 2,4 in | ★★★☆☆ |
Climate type: Continental. Source: Open-Meteo archive (ERA5).
Recent extremes in Gateway Arch National Park
Highest and lowest readings observed in the last 3 years of reanalysis data - not all-time records.
How Gateway Arch National Park compares with nearby places
Annual averages, and the difference against Gateway Arch National Park.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| St. Louis | 1 mi | 58°F | about the same | 45 in |
| Illinois | 85 mi | 56°F | 34°F cooler | 36 in |
| Starved Rock State Park | 197 mi | 53°F | 37°F cooler | 39 in |
| Branson | 215 mi | 60°F | +34°F warmer | 44 in |
| Indianapolis | 230 mi | 55°F | 35°F cooler | 43 in |
Best time to visit Gateway Arch National Park
Go in August, September and October. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: January, February and December - expect the least comfortable mix of heat, cold or rain.
What this means for Gateway Arch National Park
Today is about average for August. The forecast high of 84°F is in line with the 86°F typical for this month.
A 21% chance means most of the area stays dry; a passing shower is possible but short.
No weather-related travel disruption is expected today. Roads and airports should run normally.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 83°F.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- If your dates are flexible, avoid January, February and December - historically the least comfortable months here.
Summary
Gateway Arch National Park is a national park in Missouri. Gateway Arch National Park is a US national park known for the 630 foot stainless steel arch.
Right now it is 71°F (22°C) in Gateway Arch National Park with mainly clear. It feels like 75°F. Today runs from 58°F to 84°F. Chance of precipitation is 21%. Sightseeing conditions score 9.3/10 - excellent - go now.
The best time to visit Gateway Arch National Park is August, September and October. The climate is continental. January, February and December tend to be the least comfortable months. July is the warmest month with average highs near 88°F, while January is the coldest with lows near 22°F.
The closest major airport is Nashville International Airport (BNA), about 259 mi away. Nearby highlights include Starved Rock State Park and Mammoth Cave National Park.
In plain terms. Today is about average for August. The forecast high of 84°F is in line with the 86°F typical for this month. The best window to be outside is roughly 7 AM to 10 AM, when temperature, rain chance and wind line up best. sightseeing is the strongest bet in Gateway Arch National Park today at 9.3/10. No weather-related travel disruption is expected today. Roads and airports should run normally.
Compiled from this page's own data: atlas facts plus live Open-Meteo readings.
Quick facts about Gateway Arch National Park
| Type | National park |
|---|---|
| State | Missouri |
| Country | United States |
| Continent | North America |
| Coordinates | 38°37′28.9″N 90°11′5.3″W (38.6247, -90.1848) |
| Established | 2018 |
| Known for | the 630 foot stainless steel arch |
| Local time | 9:14 PM (UTC-05:00) |
| Best months | August, September and October |
| Climate | Continental |
Weather map for Gateway Arch National Park
Animated model layers. Pick a layer to load it.
Animated layers by Windy. For pin-level detail and nearby places, see the interactive map below.
Explore Gateway Arch National Park
Every topic we hold for this place, and the same topic for the places around it.
Climate for related places
Frequently asked questions
Where is Gateway Arch National Park?
Gateway Arch National Park is a national park in Missouri. Its coordinates are 38.6247, -90.1848. It lies in North America.
What is the weather like in Gateway Arch National Park right now?
It is currently 71°F (22°C) with mainly clear. Humidity is 72% and wind is 3 mph.
When is the best time to visit Gateway Arch National Park?
August, September and October offer the most comfortable conditions in Gateway Arch National Park, which has a continental climate. January, February and December are usually the hardest months for outdoor plans.
What time zone is Gateway Arch National Park in?
Gateway Arch National Park observes America/Chicago (UTC-05:00). The local time is 9:14 PM.
What is the nearest airport to Gateway Arch National Park?
The closest airports are Nashville International Airport (BNA), 259 mi away and O'Hare International Airport (ORD), 261 mi away.
What are the top things to do in Gateway Arch National Park?
Popular options include Starved Rock State Park and Mammoth Cave National Park.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (national-parks) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Official alerts | US National Weather Service. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 24, 2026 at 9:14 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
