Updated October 2026
Grand Portage National Monument Weather by Month
Grand Portage National Monument is warmest in July, when the nearest NOAA climate station averages a high of 74°F and a low of 52°F, and coldest in January, with an average high of 20°F and an average low of 1°F. June is the wettest month, with about 3.6 inches of precipitation. Snowfall is heaviest in January, at about 12 inches.
These figures are NOAA's 1991–2020 climate normals, the 30-year average for each calendar month, from the nearest long-record weather station, 3.4 miles from the park's reference point. A single station cannot describe a whole park: temperatures elsewhere in Grand Portage National Monument can differ from these, particularly with elevation.
Warmest month
Jul
74°F avg high
Coldest month
Jan
1°F avg low
Wettest month
Jun
3.6 in avg
Snowiest month
Jan
12.2 in avg
Longest days
Jun
15.8 h of daylight
Average weather at Grand Portage by month
| Month | Avg high | Avg low | Precipitation | Snowfall | Daylight |
|---|---|---|---|---|---|
| January | 20°F | 1°F | 1.4 in | 12.2 in | 8.6 h |
| February | 24°F | 2°F | 1.0 in | 8.0 in | 10.0 h |
| March | 34°F | 13°F | 1.3 in | 8.0 in | 11.6 h |
| April | 45°F | 26°F | 2.8 in | 7.7 in | 13.4 h |
| May | 58°F | 37°F | 3.1 in | 0.2 in | 15.0 h |
| June | 68°F | 46°F | 3.6 in | 0.0 in | 15.8 h |
| July | 74°F | 52°F | 3.4 in | 0.0 in | 15.5 h |
| August | 73°F | 52°F | 3.0 in | 0.0 in | 14.1 h |
| September | 65°F | 44°F | 3.1 in | 0.0 in | 12.3 h |
| October | 51°F | 33°F | 3.4 in | 0.5 in | 10.6 h |
| November | 38°F | 22°F | 2.7 in | 6.7 in | 9.0 h |
| December | 26°F | 9°F | 1.7 in | 11.9 in | 8.2 h |
| Year total | 30.5 in | 55.2 in |
NOAA 1991–2020 climate normals from station USC00213296, 3.4 miles from the park's reference point. Daylight is the monthly average, computed from the park's latitude. Each month links to how crowded Grand Portage is at that time of year.
Grand Portage weather by season
Winter: December to February
Average highs bottom out at 20°F in January, between 26°F in December and 24°F in February, with average lows between 1°F and 9°F. The average high stays at or below freezing in all three months. Together the three months average 4.1 inches of precipitation, about 13% of the yearly total and less than in any other season. Snowfall averages about 32 inches for the season. Daylight is at its shortest, about 8.2 hours in December.
Spring: March to May
Average highs climb from 34°F in March to 58°F in May, with average lows between 13°F and 37°F. The average low is at or below freezing in March and April. Together the three months average 7.2 inches of precipitation, about 24% of the yearly total. Snowfall averages about 16 inches for the season. Daylight lengthens from about 11.6 hours in March to 15.0 in May.
Summer: June to August
Average highs peak at 74°F in July, between 68°F in June and 73°F in August, with average lows between 46°F and 52°F. Together the three months average 10 inches of precipitation, about 33% of the yearly total and more than in any other season. Daylight is at its longest, about 15.8 hours in June.
Fall: September to November
Average highs fall from 65°F in September to 38°F in November, with average lows between 22°F and 44°F. The average low is at or below freezing in November. Together the three months average 9.2 inches of precipitation, about 30% of the yearly total. Snowfall averages about 7.2 inches for the season, most of it in November. Daylight shortens from about 12.3 hours in September to 9.0 in November.
What the National Park Service says about the weather
Short, warm summers and long, cold winters define the climate of northern Minnesota. Average range of summer temperature is from 55°F to 78°F in July and average range of winter temperatures is from –11°F to 12°F in January. Average annual precipitation in Grand Portage, MN is about 32 inches.
Weather description courtesy of the National Park Service — official park site.
Today's forecast for Grand Portage
Averages describe a typical month, not this week. For current conditions and the seven-day outlook, the National Weather Service issues a forecast for the park's reference point at 47.99°N, 89.76°W. It covers that one spot, so other elevations in the park can differ from it, as they do from the averages above.
National Weather Service forecast for Grand Portage National Monument →
Weather and crowds together
July, the warmest month, sees about 2.8× the visitors of the park's average month. August is the busiest month of the year and January the quietest. To see those crowds set against the weather for all twelve months, read the best time to visit Grand Portage National Monument. For hotels, cabins and rentals close to the park, see where to stay near Grand Portage.
Where to stay near Grand Portage
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Top-rated places to stay near Grand Portage
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Frequently Asked Questions
July is the warmest month at Grand Portage National Monument, with an average high of 74°F and an average low of 52°F. That is the 1991–2020 average at the nearest long-record NOAA station, 3.4 miles from the park's reference point. Temperatures inside the park can differ, particularly with elevation.
January is the coldest month at Grand Portage National Monument, with an average low of 1°F and an average high of 20°F, based on NOAA 1991–2020 climate normals.
June is the wettest month, with about 3.6 inches of precipitation. February is the driest, at about 1 inch. The station records about 30.5 inches of precipitation in an average year.
Yes. The nearest long-record NOAA station, 3.4 miles from the park's reference point, averages about 55 inches of snow a year. January is the snowiest month, at about 12 inches. The station averages at least a tenth of an inch of snow in 8 of the 12 months.
Weather at nearby parks
Keep exploring
Sources: NOAA NCEI U.S. Climate Normals 1991–2020 (station USC00213296), daylight computed from latitude, weather description from the National Park Service, crowd levels from National Park Service Visitor Use Statistics (1979–2025). Updated 2026-10-11. Lodging results are provided by Stay22; WhenToVisitParks may earn a commission from bookings, at no extra cost to you.