Weather on July 18 at Isle Royale

Isle Royale National Park

MIMidwest800 ft elevation
Avg High79°F
Avg Low58°F
Warmest197585°F
Coldest200955°F

Based on 50 years of data from Houghton, MI

Planning Your Visit

July 18th in Isle Royale National Park (via Houghton, MI) typically brings pleasant summer weather, with average highs around 79°F and lows near 58°F. Over 50 years of records, the warmest July 18th was in 1975 (85°F average), while the coldest was 2009 (55°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 40% of July 18th dates historically, with the wettest July 18th recording 5.08" of rain. The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.

The last decade has been 1.0°F cooler on this date compared to 20-30 years ago.

Planning for July 18th in Isle Royale? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.

Year by Year History

YearHighLowPrecipSnow
202574°F47°F0.38"--
202474°F46°F0"--
202369°F48°F0"--
202288°F58°F0.3"--
202186°F57°F0"--
202083°F66°F3.43"--
201981°F66°F0.38"--
201877°F49°F0"--
201781°F57°F0.43"--
201673°F50°F0"--
201584°F61°F0.1"--
201480°F52°F0"--
201389°F66°F3.91"--
201274°F59°F0"--
201188°F69°F0.03"--
201076°F56°F0"--
200960°F50°F0"--
200874°F56°F0"--
200781°F53°F0.1"--
200680°F53°F0"--
200579°F59°F0.3"--
200475°F48°F0"--
200374°F51°F0"0"
200284°F58°F0"0"
200184°F68°F5.08"0"
200063°F49°F0"0"
199976°F57°F0"0"
199882°F57°F0"0"
199784°F59°F0"0"
199682°F61°F0.28"0"
199566°F57°F0.46"0"
199477°F60°F0"0"
199377°F61°F0.03"0"
199268°F53°F0"0"
199192°F68°F0"0"
199079°F62°F0.03"0"
198976°F60°F0"0"
198879°F60°F0"0"
198387°F60°F0"0"
198175°F58°F0"0"
198070°F60°F0.56"0"
197978°F54°F0.23"0"
197878°F61°F2.26"0"
197792°F56°F0"0"
197681°F62°F0"0"
197598°F71°F0"0"
197482°F65°F0"0"
197380°F63°F0.2"0"
197280°F52°F0.03"0"
197167°F49°F0"0"

July 18 at Nearby Parks

Holiday Weather at Isle Royale

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

Explore More at Isle Royale

See historical weather for other dates

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