Climatological data from the Grand Marais, Minnesota weather station from August 1926. Weather data provided by NOAA Regional Climate Centers. Accessed January 1, 2026.
Climatological Data for GRAND MARAIS, MN - September 1926
| Date | Max Temp|Min Temp| Avg | Depart | HDD |CDD|Precip|
| ---------- | ------- | ------ |
| 1926-09-01 | 60 | 52 | 56.0 | \-3.0 | 9 | 0 | 1.50 |
| 1926-09-02 | 56 | 48 | 52.0 | \-6.8 | 13 | 0 | 0.30 |
| 1926-09-03 | 56 | 49 | 52.5 | \-6.0 | 12 | 0 | 0.30 |
| 1926-09-04 | 54 | 47 | 50.5 | \-7.7 | 14 | 0 | M |
| 1926-09-05 | 56 | 47 | 51.5 | \-6.5 | 13 | 0 | 0.10 |
| 1926-09-06 | 66 | 51 | 58.5 | 0.8 | 6 | 0 | 0.50 |
| 1926-09-07 | 60 | 46 | 53.0 | \-4.4 | 12 | 0 | 0.00 |
| 1926-09-08 | 65 | 54 | 59.5 | 2.4 | 5 | 0 | 1.10 |
| 1926-09-09 | 67 | 41 | 54.0 | \-2.8 | 11 | 0 | 0.00 |
| 1926-09-10 | 60 | 44 | 52.0 | \-4.5 | 13 | 0 | 0.00 |
| 1926-09-11 | 60 | 46 | 53.0 | \-3.2 | 12 | 0 | 0.20 |
| 1926-09-12 | 63 | 41 | 52.0 | \-3.9 | 13 | 0 | 0.00 |
| 1926-09-13 | 65 | 36 | 50.5 | \-5.1 | 14 | 0 | 0.00 |
| 1926-09-14 | 56 | 46 | 51.0 | \-4.3 | 14 | 0 | 0.19 |
| 1926-09-15 | 60 | 46 | 53.0 | \-1.9 | 12 | 0 | 0.00 |
| 1926-09-16 | 62 | 44 | 53.0 | \-1.6 | 12 | 0 | 0.00 |
| 1926-09-17 | 61 | 52 | 56.5 | 2.2 | 8 | 0 | 0.20 |
| 1926-09-18 | 63 | 52 | 57.5 | 3.6 | 7 | 0 | 0.55 |
| 1926-09-19 | 66 | 50 | 58.0 | 4.4 | 7 | 0 | 0.00 |
| 1926-09-20 | 65 | 40 | 52.5 | \-0.7 | 12 | 0 | 0.00 |
| 1926-09-21 | 57 | 48 | 52.5 | \-0.4 | 12 | 0 | 0.10 |
| 1926-09-22 | 63 | 42 | 52.5 | 0.0 | 12 | 0 | 0.41 |
| 1926-09-23 | 48 | 39 | 43.5 | \-8.7 | 21 | 0 | 0.35 |
| 1926-09-24 | 52 | 36 | 44.0 | \-7.8 | 21 | 0 | 0.60 |
| 1926-09-25 | 44 | 31 | 37.5 | \-13.9 | 27 | 0 | 0.00 |
| 1926-09-26 | 49 | 30 | 39.5 | \-11.6 | 25 | 0 | 0.00 |
| 1926-09-27 | 55 | 30 | 42.5 | \-8.2 | 22 | 0 | 0.00 |
| 1926-09-28 | 53 | 32 | 42.5 | \-7.8 | 22 | 0 | 0.00 |
| 1926-09-29 | 54 | 36 | 45.0 | \-4.9 | 20 | 0 | 0.00 |
| 1926-09-30 | 50 | 38 | 44.0 | \-5.5 | 21 | 0 | 0.00 |