• A fall day on Mt. Rose overlooking the historic depot at Grand Portage.

    Grand Portage

    National Monument Minnesota

Weather

Rain Shower
Rain showers at Canoe Warehouse
NPS Photo / Mike Plummer-Steen
 
  • Weather conditions change frequently, due to the site’s location on the north shore of Lake Superior. Cool onshore lake breezes are common in spring, summer and fall along with an occasional shower. Summer inland temperatures can reach into the 80’s and 90’s but are usually 10 to 15 degrees cooler by Lake Superior. The Heritage Center and Historic Site overlook Grand Portage Bay on Lake Superior and can be cool throughout the summer months. Having layers of clothing to put on or remove and being prepared for summer showers are the best advice we can offer to prepare you for the varieties of possible weather conditions. Winter weather can be very cold and windy, with consecutive days of sub-zero temperatures, followed by pleasant, calm, sunny and moderate temperatures in the 20’s and 30’s.
  • Grand Portage, Minnesota Weather Facts
    • July is the average warmest month.
    • The highest recorded temperature was 95°F in 1995.
    • On average, the coolest month is January.
    • The lowest recorded temperature was -43°F in 1996.
    • The maximum average precipitation occurs in September.
  • Mosquitoes, gnats, black flies are plentiful during the spring and summer months especially inland along the 8 ½ mile Grand Portage footpath. Layers of impenetrable clothing are recommended, as is the use of a head net. Also effective is the use of insect repellent containing DEET placed directly on outer clothing layers. The voyageur’s choice of repellent, bear grease and skunk oil, will probably discourage the swarms as well as your neighbors for a little while!

Weather Links:

NOAA

Thunder Bay Environment Canada

Monthly Weather Data for Grand Portage, Minnesota

Month

Average

Highs (F)

Average

Lows (F)

Rainfall

Average (IN)

January

19

-3

1.33

February

24

2

0.80

March

35

14

1.55

April

47

27

2.22

May

61

38

2.86

June

69

46

3.19

July

75

51

3.45

August

73

52

3.10

September

64

43

3.68

October

52

34

3.25

November

37

20

2.37

December

24

4

1.56



Did You Know?

Birchbark baskets made by Rose Porter of Grand Portage.

The Grand Portage Ojibwe are renowned for beautifully made birchbark items, floral beadwork and cedar strip mats.