Weather on October 21 at Gateway Arch

Gateway Arch National Park

MOMidwest450 ft elevation
Avg High69°F
Avg Low44°F
Warmest197976°F
Coldest197639°F

Based on 52 years of data from St. Louis, MO

Planning Your Visit

October 21st in Gateway Arch National Park (via St. Louis, MO) typically brings mild fall weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 52 years of records, the warmest October 21st was in 1979 (76°F average), while the coldest was 1976 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 17% of October 21st dates historically, with the wettest October 21st recording 1.47" of rain. Temperatures on this date have remained relatively stable over the past several decades.

Temperatures on this date have remained relatively stable over the past several decades.

Planning for October 21st in Gateway Arch? Great weather for outdoor activities.

Year by Year History

YearHighLowPrecipSnow
202567°F48°F0"0"
202479°F40°F0"0"
202380°F41°F0"0"
202282°F42°F0"0"
202166°F50°F0"0"
202059°F52°F0.41"0"
201969°F52°F0.58"0"
201856°F25°F0"0"
201776°F63°F--0"
201663°F42°F0"0"
201580°F58°F0.05"0"
201474°F48°F0"0"
201372°F48°F0"0"
201266°F49°F0"0"
201156°F37°F0"--
201074°F41°F0"0"
200975°F46°F0"0"
200872°F42°F0"0"
200782°F49°F0"0"
200665°F35°F0"0"
200567°F50°F1.19"0"
200458°F51°F0"0"
200389°F60°F0"0"
200257°F35°F0"0"
200175°F43°F0"0"
200076°F46°F0"0"
199958°F37°F0"0"
199865°F46°F0"0"
199759°F46°F0"0"
199667°F51°F1.47"0"
199554°F39°F0"0"
199476°F45°F0"0"
199362°F43°F0"0"
199276°F47°F0"0"
199172°F50°F0"0"
199069°F37°F0"0"
198973°F35°F0"0"
198867°F43°F0"0"
198760°F27°F0.43"0"
198680°F47°F0"0"
198567°F50°F0"0"
198255°F27°F0.03"0"
198074°F42°F0"0"
197980°F71°F0"0"
197878°F44°F0"0"
197770°F39°F0"0"
197648°F31°F0.03"0"
197582°F44°F0"0"
197455°F26°F0"0"
197368°F41°F0"0"
197255°F37°F0"0"
197183°F50°F1.4"0"

October 21 at Nearby Parks

Holiday Weather at Gateway Arch

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

Explore More at Gateway Arch

See historical weather for other dates

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