Kp index archive, day by day

Check how active the geomagnetic field was on any day from September 20, 2025 to October 24, 2026 (400 days). Kp is measured every 3 hours on a 0-9 scale; from Kp 5 it is a geomagnetic storm and the aurora shows farther from the pole.

Kp now and aurora forecast →

At a glance

3storm days (Kp 5+) in the last 30 days
7storm days in the last 90 days
61storm days in the whole archive (400 days)
266quiet days (Kp below 4)
Kp 8.7strongest storm in the archive: November 12, 2025 (G4)

Month by month

MonthStorm days (Kp 5+)Highest KpAverage daily highest Kp
October 202637.3 G33.4
September 202615 G12.7
August 202636 G22.8
July 202627 G32.9
June 202626 G23
May 202636 G23.1
April 202656.3 G23.2
March 202687 G33.6
February 202645.7 G13.6
January 2026108.7 G44.2
December 202556.7 G23.7
November 202568.7 G44.1
October 202576.7 G23.7
September 202527 G33.2

Strongest storms in the archive

  1. Kp 8.7 G4 · severe storm
  2. Kp 8.7 G4 · severe storm
  3. Kp 7.7 G3 · strong storm
  4. Kp 7.3 G3 · strong storm
  5. Kp 7.3 G3 · strong storm
  6. Kp 7.3 G3 · strong storm
  7. Kp 7 G3 · strong storm
  8. Kp 7 G3 · strong storm
  9. Kp 7 G3 · strong storm
  10. Kp 7 G3 · strong storm

Day by day

Cell colour: green below 4, yellow 4, orange 5-6, red 7 and above.

DayKp every 3 hours (UTC)HighestNOAA scale
21.30.71.71.31.31.30.72-
1.72222.72.34.31.74.3-
2.732.73.33.73.73.733.7-
3.741.72.323.344.74.7-
1.30.70.72.322.32.33.33.3-
0000.30.30.30.30.70.7-
1.72.31.71.301.31.30.32.3-
1.30.70.30.30.72.731.33-
311.32.31.73.3424-
210.73.32.332.72.33.3-
2.33.31.321.722.72.73.3-
3.33.323322.713.3-
1.72310.31213-
43.72.732.32.31.724-
23.32.723.77.375.77.3G3
3323.71.70.712.73.7-
11121.31.32.312.3-
10.310.30.72.72.712.7-
332.32.32.31.32.32.73-
4523.32.743.73.75G1
33.34.354.74.75.755.7G1
1.32.721.71.30.30.312.7-
0.70.700.30.300.71.71.7-
00.30.30.30.71.31.31.71.7-
0.70.300.70.70.30.30.30.7-
1.700.310.30.70.30.71.7-
01.30.30.70.70.710.31.3-
42.71.3110.70.704-
3.33.32.32.71.3122.33.3-
3.73.33.743.32.7344-
2.722.743.33.322.74-
0.3000.300.31.31.71.7-
1.70.30000.70.70.71.7-
1.30.700000.311.3-
22.71.70.30.30.30.312.7-
22.71.3111.31.31.72.7-
11.71.71.30.70.711.31.7-
2.321.31.332.3223-
3.32.72220.70.31.33.3-
2.72.300.32.30.7233-
121.722.742.73.34-
231.70.310.70.30.73-
1.32.32.71.71.71.31.30.32.7-
12.71.72.321.30.722.7-
2.72.31.32.72.31.312.72.7-
2.31.31.72.3332.72.73-
4.74.353.734.333.35G1
0.71.73.33.733.73.74.74.7-
0.70.70.710.7121.32-
1.72.7220.70.70.712.7-
10.70.71.30.70.70.701.3-
1.710.30.71221.32-
0.71221.711.712-
0.71.31.72.31.31.721.32.3-
33.33.331.71.71.30.73.3-
3.33.73.33.322.72.32.33.7-
4.33.342.72.323.724.3-
100.71.33.333.744-
0.700.30.30.30.30.311-
00.30.30.30.70.300.30.7-
10.30.70.70.70.70.301-
210.30.70.30.3133-
0.71.31.31.31.711.31.31.7-
0.70.301.3110.70.31.3-
32.31.311.7111.73-
2.71.71.71.7323.32.73.3-
2.34.74421.72.334.7-
3.74.73.71.72.31.75.34.35.3G1
0.71.72.312.333.33.73.7-
11.71.70.70.300.30.31.7-
0.710.311.31.72.312.3-
2.72.32.72.321.7212.7-
22.31.3110.31.733-
1.32.7222.31.32.312.7-
0.30.301.72.731.70.73-
1.70.711.30.30.30.311.7-
2.721.71.3111.722.7-
0.31.324645.73.76G2
00.310.71.30.30.301.3-
10.70000.30.301-
0.30.30.7000.30.31.31.3-
4.32.72.31.710.70.70.74.3-
4.34.32.333233.74.3-
0.30.3113.75.7425.7G1
0.30.30.70.70.70.70.30.70.7-
10.30.70.71.71.30.70.71.7-
0.70.70.31.311.310.31.3-
1.71.70.70.70.70.70.70.71.7-
2.311.322.3222.72.7-
10.710.70.7222.32.3-

Source: GFZ Helmholtz Centre for Geosciences (Kp, CC BY 4.0) and NOAA SWPC (estimated Kp for the latest days).