Gateway Arch in June: Crowds, Weather & What to Pack

Shoulder · VisitWhen score 71/100 · #8 of 12 months

June is a solid shoulder-season month to visit Gateway Arch National Park: crowds run 49% of the July peak (234,103 average visits). Weather: highs average 86°F and lows 65°F, with 4.4″ of precipitation and 14.9 hours of daylight. Computed from NPS and NOAA data.

Bring for Gateway Arch in June

Sun protection and 2L+ water per personSee it on AmazonWhy: highs average 86°F.
Rain shell + pack coverSee it on AmazonWhy: 4.4″ of precipitation is normal this month.
Waterproof boots — plus navigation and a basic first-aid kitSee it on AmazonWhy: 4.4″ of rain is normal this month.

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looking up at the curve of the Gateway Arch against the sky — Gateway Arch National Park — photo: NPS Photo/Sue Ford (public-domain NPS media)

Crowds in June

Gateway Arch averages 234,103 recreation visits in June — 49% of what July, the peak month, draws. Plan lodging and entries with that in mind.

Average visits (June)

234,103 (mean 2021–2025, NPS)

Share of the year

11.8% of annual visitation

vs. peak (July)

49%

Weather & daylight

Expect warm days (highs average 86°F), and nights stay mild (lows average 65°F). This is one of the wetter months (4.4″ of precipitation on average). Mid-month daylight runs 14.9 hours.

NOAA 1991–2020 monthly normals, station CAHOKIA ST LOUIS AP, IL US (4 mi from park coordinates, 413 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of June.

What to pack for Gateway Arch in June

Computed from the month's weather normals above — not a generic list.

Sun protection and 2L+ water per person — highs average 86°F
Rain shell + pack cover — 4.4″ of precipitation is normal this month
Waterproof boots — plus navigation and a basic first-aid kit — 4.4″ of rain is normal this month

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Looking for a better window? The computed best months for Gateway Arch are April and September.

Also at their best in June

Other parks whose computed June verdict is a best window — same NPS × NOAA formula:

North Cascades in June — 26% of peak crowds, highs 74°F, score 91/100
Katmai in June — 34% of peak crowds, highs 59°F, score 88/100
Crater Lake in June — 44% of peak crowds, highs 57°F, score 84/100
Olympic in June — 48% of peak crowds, highs 67°F, score 78/100

Common questions

Is Gateway Arch crowded in June?

Moderately: June runs 49% of the July peak, averaging 234,103 visits (NPS, 2021–2025).

What is the weather like in Gateway Arch in June?

Average highs of 86°F, lows of 65°F, 4.4″ of precipitation (NOAA 1991–2020 normals, CAHOKIA ST LOUIS AP, IL US station).

What should I pack for Gateway Arch in June?

Sun protection and 2L+ water per person; Rain shell + pack cover; Waterproof boots — plus navigation and a basic first-aid kit — the full weather-computed list is on this page.

See also: the best national parks to visit in June · Last verified 2026-09-24