Sept-Îles, Quebec climate data is summarized below. Average annual temperatures range from 29.3 °F (low) to 43.1 °F (high). Annual precipitation averages 31.4 Inches. Sept-Îles is located in USDA Plant Hardiness Zone 3b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -27.3 °F | -22.2 °F | 0 in. |
| February | -26.7 °F | -21.2 °F | 0 in. |
| March | -24.9 °F | -19.1 °F | 0 in. |
| April | -19.8 °F | -15.7 °F | 1549.4 in. |
| May | -16.2 °F | -12.1 °F | 2641.6 in. |
| June | -12.8 °F | -8.9 °F | 2032 in. |
| July | -10.9 °F | -7.1 °F | 2692.4 in. |
| August | -10.7 °F | -7 °F | 2336.8 in. |
| September | -13.6 °F | -9.6 °F | 2870.2 in. |
| October | -16.4 °F | -12.8 °F | 3225.8 in. |
| November | -19.7 °F | -16.4 °F | 2260.6 in. |
| December | -24.5 °F | -20.3 °F | 635 in. |
| Annual | 29.3 °F | 43.1 °F | 31.36 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Normal |