Updated October 2026
Rock Island State Park: Weather by Month and When to Go
Rock Island State Park is a state park in Wisconsin. The USGS Protected Areas Database maps about 990 acres under its name. Average highs range from 26°F in January to 76°F in July.
Average highs sit between 60°F and 80°F in June through September. They stay below 60°F in October through May. The figures are NOAA climate normals for 1991–2020, measured at a weather station 5.3 miles from the park.
Warmest average high
76°F
July
Coldest average low
11°F
January and February
Most precipitation
3.6 in
October
Longest days
15.5 h
June
Rock Island State Park weather by month
| Month | Average high | Average low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 26°F | 11°F | 1.6 in | 15.0 in | 8.9 h |
| February | 28°F | 11°F | 1.1 in | 13.0 in | 10.2 h |
| March | 36°F | 20°F | 1.7 in | 9.5 in | 11.6 h |
| April | 47°F | 30°F | 2.9 in | 5.7 in | 13.3 h |
| May | 59°F | 40°F | 3.0 in | 0.0 in | 14.7 h |
| June | 70°F | 50°F | 3.1 in | 0.0 in | 15.5 h |
| July | 76°F | 57°F | 2.8 in | 0.0 in | 15.1 h |
| August | 75°F | 57°F | 3.0 in | 0.0 in | 13.9 h |
| September | 68°F | 51°F | 3.2 in | 0.0 in | 12.3 h |
| October | 55°F | 40°F | 3.6 in | 0.2 in | 10.7 h |
| November | 42°F | 29°F | 2.3 in | 3.4 in | 9.3 h |
| December | 32°F | 19°F | 1.8 in | 12.0 in | 8.5 h |
Temperature, precipitation and snowfall figures are NOAA climate normals for 1991–2020 from station USC00478905, the nearest station with a complete set of temperature normals, 5.3 miles from the park. Conditions in the park can differ from the station's, most of all where the two sit at different elevations. Daylight is calculated for the park's latitude at the middle of each month. The acreage is what the USGS Protected Areas Database maps under the park's name. The state's own figure can differ, because the database may hold part of a park under another name.
What the averages show
- Temperature. July is the warmest month, with an average high of 76°F and an average low of 57°F. January and February are the coldest months, each with an average low of 11°F.
- Precipitation. October is the wettest month, averaging 3.6 inches of precipitation, and February is the driest, at 1.1 inches. An average year brings about 30.1 inches in total.
- Snowfall. The station averages 58.8 inches of snow a year, with the most in January (15.0 inches).
- Daylight. Days run from about 8.5 hours of daylight in December to 15.5 hours in June.
Camping, trails, maps and fees
Whether Rock Island State Park has camping or cabins, where its trails run, when it opens and what it charges are all published by the agency that runs the park. Its official page is the place to check before a trip.
Official Rock Island State Park page
For the forecast rather than the averages, the National Weather Service issues a point forecast for the park's location.
National Weather Service forecast for Rock Island State Park
Where to stay near Rock Island State Park
Hotels, cabins and vacation rentals near Rock Island State Park, with live availability and prices.
Top-rated places to stay near Rock Island State Park
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Frequently Asked Questions
July is the warmest month, with an average high of 76°F and an average low of 57°F. January and February are the coldest months, each with an average low of 11°F. These are NOAA 1991–2020 climate normals from a weather station 5.3 miles from the park.
Average highs sit between 60°F and 80°F in June through September. They stay below 60°F in October through May.
October is the wettest month, averaging 3.6 inches of precipitation, and February is the driest, at 1.1 inches. An average year brings about 30.1 inches in total. Snowfall averages 58.8 inches a year, with the most in January.
Days run from about 8.5 hours of daylight in December to 15.5 hours in June. The hours are calculated for the park's latitude.
Nearest National Park Service sites
- Sleeping Bear Dunes National Lakeshore51 miles away
- Pictured Rocks National Lakeshore83 miles away
- Keweenaw National Historical Park146 miles away
Nearby state parks
- Peninsula State Park27 miles away
- Whitefish Dunes State Park39 miles away
- Petoskey State Park93 miles away · Michigan
- Wilderness State Park94 miles away · Michigan
Distances are measured in a straight line from the park, so the drive is longer.
Sources: NOAA NCEI U.S. Climate Normals 1991–2020; USGS Protected Areas Database for location and acreage; the official Wisconsin state park listing for the park's name.