Geomagnetic Storms in September, 2025
13 storms ↑ MAX: Kp 7.3 ↓ MIN: Kp 0.2
13 storms ↑ MAX: Kp 7.3 ↓ MIN: Kp 0.2
In September 2025, 13 geomagnetic storms were recorded; the strongest was Kp 7.3 on September 29, 2025. The longest run of consecutive active days was 6 (4 Sep–9 Sep).
Most powerful Geomagnetic Storms in September 2025
| Date | Class | Level | Duration |
|---|---|---|---|
| September 29, 2025 | Kp 7.3 | Strong (G3) | 36 h |
| September 1, 2025 | Kp 7 | Strong (G3) | 6 h |
| September 14, 2025 | Kp 7 | Strong (G3) | 15 h |
| September 16, 2025 | Kp 7 | Strong (G3) | 3 h |
| September 2, 2025 | Kp 6 | Moderate (G2) | 9 h |
| September 5, 2025 | Kp 6 | Moderate (G2) | 3 h |
| September 6, 2025 | Kp 6 | Moderate (G2) | 6 h |
| September 8, 2025 | Kp 6 | Moderate (G2) | 3 h |
| September 9, 2025 | Kp 6 | Moderate (G2) | 9 h |
| September 4, 2025 | Kp 5 | Minor (G1) | 3 h |
| September 7, 2025 | Kp 5 | Minor (G1) | 6 h |
| September 16, 2025 | Kp 5 | Minor (G1) | 3 h |
| September 17, 2025 | Kp 5 | Minor (G1) | 3 h |