Weather on June 21 at Gateway Arch

Gateway Arch National Park

MOMidwest450 ft elevation
Avg High88°F
Avg Low67°F
Warmest202587°F
Coldest199258°F

Based on 53 years of data from St. Louis, MO

Planning Your Visit

June 21st in Gateway Arch National Park (via St. Louis, MO) typically brings warm summer weather, with average highs around 88°F and lows near 67°F. Over 53 years of records, the warmest June 21st was in 2025 (87°F average), while the coldest was 1992 (58°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 25% of June 21st dates historically, with the wettest June 21st recording 6.86" of rain. The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.

The last decade has been 3.7°F warmer on this date compared to 20-30 years ago.

Planning for June 21st in Gateway Arch? Stay hydrated and seek shade during peak afternoon hours.

Year by Year History

YearHighLowPrecipSnow
202596°F77°F0"0"
202494°F68°F0"0"
202389°F67°F0"0"
202297°F65°F0"0"
202177°F56°F--0"
202087°F66°F6.86"0"
201979°F64°F2.39"--
201890°F76°F0"0"
201790°F73°F0"0"
201695°F73°F0.03"0"
201588°F69°F0.81"0"
201493°F71°F0.86"0"
201391°F74°F0"0"
201295°F75°F0"0"
201190°F68°F0.74"0"
201094°F75°F0"0"
200991°F73°F0"0"
200878°F62°F0"0"
200785°F62°F0"0"
200692°F74°F0"0"
200582°F60°F0"0"
200479°F65°F0"0"
200380°F59°F0"0"
200290°F68°F0"0"
200181°F67°F0.74"0"
200087°F67°F2.54"0"
199983°F66°F0"0"
199878°F68°F0.71"0"
199789°F73°F0"0"
199691°F72°F0"0"
199592°F67°F0.05"0"
199493°F73°F0"0"
199387°F68°F0"0"
199270°F47°F0"0"
199188°F68°F0.1"0"
199088°F64°F0"0"
198990°F67°F0"0"
198899°F72°F0"0"
198793°F67°F0"0"
198694°F66°F0"0"
198585°F63°F0"0"
198492°F71°F0"0"
198186°F68°F0.69"0"
198085°F65°F0"--
197994°F66°F0"0"
197879°F--0"0"
197789°F60°F0"0"
197682°F51°F0"0"
197590°F66°F0.13"0"
197480°F72°F0"0"
197385°F66°F0"0"
197284°F57°F0"0"
197193°F71°F0"0"

June 21 at Nearby Parks

Holiday Weather at Gateway Arch

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

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