Weather on March 31 at Gateway Arch

Gateway Arch National Park

MOMidwest450 ft elevation
Avg High62°F
Avg Low41°F
Warmest202674°F
Coldest197535°F

Based on 55 years of data from St. Louis, MO

Planning Your Visit

March 31st in Gateway Arch National Park (via St. Louis, MO) typically brings mild spring weather, with average highs around 62°F and lows near 41°F. Over 55 years of records, the warmest March 31st was in 2026 (74°F average), while the coldest was 1975 (35°F) — a 39°F range across recorded history. Rain or other precipitation has occurred on about 36% of March 31st dates historically, with the wettest March 31st recording 2.95" of rain. The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.

The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.

Planning for March 31st in Gateway Arch? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202684°F65°F0"--
202555°F40°F0"0"
202482°F55°F0"0"
202375°F54°F2.74"--
202242°F38°F0"0"
202155°F38°F0"0"
202062°F40°F0"0"
201945°F31°F0"0"
201858°F--0"0"
201770°F45°F0.89"0"
201668°F57°F1.78"0"
201571°F51°F0"0"
201464°F46°F0"0"
201364°F47°F0.25"0"
201282°F49°F0"--
201151°F33°F0"0"
201072°F41°F0"0"
200966°F36°F0.2"0"
200862°F47°F0.03"0"
200767°F59°F0.71"0"
200677°F45°F0.08"0"
200579°F46°F0.05"0"
200453°F36°F0.05"0"
200351°F33°F0"0"
200262°F42°F0"0"
200154°F32°F0"0"
200060°F33°F0"0"
199971°F42°F0"0"
199878°F57°F1.4"0"
199757°F37°F0"0"
199658°F41°F2.95"0"
199549°F29°F0"0"
199457°F24°F0"0"
199372°F51°F1.22"0"
199263°F31°F0"0"
199166°F33°F0"0"
199060°F46°F0"0"
198950°F28°F0.86"0"
198855°F45°F0"0"
198748°F29°F0"0"
198684°F56°F0"0"
198550°F38°F1.83"0"
198455°F28°F0"0"
198347°F40°F0.05"0"
198268°F46°F0.76"0"
198051°F39°F0.51"0"
197970°F43°F0.53"0"
197866°F43°F0"--
197771°F38°F0"0"
197657°F31°F0"0"
197545°F26°F0"0"
197464°F40°F0"0"
197366°F41°F1.57"0"
197249°F30°F0"--
197171°F--0"--

March 31 at Nearby Parks

Holiday Weather at Gateway Arch

Official NPS WebsiteVisit nps.gov/jeff for park information, alerts, and reservations

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March 31 Weather at Gateway Arch National Park - Historical Data