Updated October 2026
Gateway Arch National Park Weather by Month
Gateway Arch National Park is warmest in July, when the nearest NOAA climate station averages a high of 89°F and a low of 69°F, and coldest in January, with an average high of 41°F and an average low of 22°F. July is the wettest month, with about 5 inches of precipitation. Snowfall is heaviest in January, at about 4.9 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 4.1 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Gateway Arch National Park can differ from these, particularly with elevation.
Warmest month
Jul
89°F avg high
Coldest month
Jan
22°F avg low
Wettest month
Jul
5.0 in avg
Snowiest month
Jan
4.9 in avg
Longest days
Jun
14.7 h of daylight
Average weather at Gateway Arch by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 41°F | 22°F | 2.7 in | 4.9 in | 9.6 h |
| February | 46°F | 26°F | 2.3 in | 3.7 in | 10.5 h |
| March | 56°F | 35°F | 3.6 in | 1.2 in | 11.7 h |
| April | 68°F | 45°F | 4.6 in | 0.3 in | 13.0 h |
| May | 76°F | 56°F | 4.8 in | 0.0 in | 14.1 h |
| June | 85°F | 65°F | 4.3 in | 0.0 in | 14.7 h |
| July | 89°F | 69°F | 5.0 in | 0.0 in | 14.4 h |
| August | 87°F | 67°F | 3.1 in | 0.0 in | 13.5 h |
| September | 80°F | 59°F | 3.4 in | 0.0 in | 12.2 h |
| October | 70°F | 46°F | 3.0 in | 0.0 in | 11.0 h |
| November | 56°F | 35°F | 3.3 in | 0.8 in | 9.9 h |
| December | 45°F | 27°F | 2.8 in | 2.9 in | 9.3 h |
| Year total | 42.9 in | 13.8 in |
NOAA 1991–2020 climate normals from station USC00111160, 4.1 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Gateway Arch is at that time of year.
Gateway Arch weather by season
Winter: December to February
Average highs bottom out at 41°F in January, between 45°F in December and 46°F in February, with average lows between 22°F and 27°F. The average low is at or below freezing in all three months. Together the three months average 7.8 inches of precipitation, about 18% of the yearly total and less than in any other season. Snowfall averages about 12 inches for the season. Daylight is at its shortest, about 9.3 hours in December.
Spring: March to May
Average highs climb from 56°F in March to 76°F in May, with average lows between 35°F and 56°F. Together the three months average 13 inches of precipitation, about 30% of the yearly total and more than in any other season. Snowfall averages about 1.5 inches for the season, most of it in March. Daylight lengthens from about 11.7 hours in March to 14.1 in May.
Summer: June to August
Average highs peak at 89°F in July, between 85°F in June and 87°F in August, with average lows between 65°F and 69°F. Together the three months average 12.4 inches of precipitation, about 29% of the yearly total. Daylight is at its longest, about 14.7 hours in June.
Fall: September to November
Average highs fall from 80°F in September to 56°F in November, with average lows between 35°F and 59°F. Together the three months average 9.7 inches of precipitation, about 23% of the yearly total. Snowfall averages about 0.8 inches for the season. Daylight shortens from about 12.2 hours in September to 9.9 in November.
What the National Park Service says about the weather
Normal Daily Mean Temperature (in degrees Fahrenheit)* January - 29.3 February - 33.9 March - 45.1 April - 56.7 May - 66.1 June - 75.4 July - 79.8 August - 77.6 September - 70.2 October - 58.4 November - 46.2 December - 33.9 Average Percent of Days with Sunshine* January - 50% February - 52% March - 54% April - 56% May - 59% June - 66% July - 68% August - 65% September - 63% October - 60% November - 46% December - 53% *Source: National Oceanic and Atmospheric Administration
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Gateway Arch
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 38.63°N, 90.19°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Gateway Arch National Park →
Weather and crowds together
July is both the warmest month and the busiest, with about 2.9× the visitors of the park's average month. January is the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Gateway Arch National Park. For hotels, cabins and rentals close to the park, see where to stay near Gateway Arch.
Where to stay near Gateway Arch
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Top-rated places to stay near Gateway Arch
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Frequently Asked Questions
July is the warmest month at Gateway Arch National Park, with an average high of 89°F and an average low of 69°F. That is the 1991–2020 average at the nearest long-record NOAA station, 4.1 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Gateway Arch National Park, with an average low of 22°F and an average high of 41°F, based on NOAA 1991–2020 climate normals.
July is the wettest month, with about 5 inches of precipitation. February is the driest, at about 2.3 inches. The station records about 42.9 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 4.1 miles from the park's reference point, averages about 14 inches of snow a year. January is the snowiest month, at about 4.9 inches. The station averages at least a tenth of an inch of snow in 6 of the 12 months.
Weather at nearby parks
10 mi away · warmest in July (90°F)
45 mi away · warmest in July (89°F)
86 mi away · warmest in July (86°F)
118 mi away · warmest in July (92°F)
143 mi away · warmest in July (89°F)
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00111160), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.