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Solar flares in May 2026
C-class226
M-class9
X-class0
LargestM5.72026-05-10
Sunspot number99.4NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| May 2025 | 227 | 20 | 3 | X2.4 |
| May 2026 | 226 | 9 | 0 | M5.7 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2026-05-10 | 13:19 | 13:39 | 43 | M5.7 | – | – |
| 2026-05-07 | 14:20 | 15:14 | 80 | M2.6 | – | – |
| 2026-05-22 | 10:03 | 10:29 | 58 | M2.3 | – | – |
| 2026-05-16 | 17:39 | 17:42 | 5 | M1.9 | – | – |
| 2026-05-04 | 01:13 | 01:33 | 31 | M1.8 | – | – |
| 2026-05-16 | 15:50 | 16:12 | – | M1.8 | – | – |
| 2026-05-17 | 03:29 | 03:39 | 13 | M1.4 | – | – |
| 2026-05-16 | 16:22 | 16:29 | 12 | M1.3 | – | – |
| 2026-05-29 | 06:40 | 07:04 | 44 | M1.1 | – | – |
| 2026-05-17 | 20:42 | 20:53 | 23 | C9.7 | – | – |
| 2026-05-26 | 12:30 | 12:38 | 14 | C9.7 | – | – |
| 2026-05-21 | 18:19 | 18:25 | 11 | C9.5 | – | – |
| 2026-05-15 | 16:05 | 16:14 | 13 | C9.4 | – | – |
| 2026-05-02 | 18:30 | 18:38 | 12 | C8.7 | – | – |
| 2026-05-21 | 18:04 | 18:14 | – | C8.3 | – | – |
All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.
About this page
235 flares of class C or larger in May 2026; by M/X count it ranks 260 of 565 months.