Solar Flare WatchHome › Flare history › 2025
Solar flares in May 2025
C-class227
M-class20
X-class3
LargestX2.42025-05-14
Sunspot number82.6NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| May 2024 | 228 | 128 | 20 | X8.6 |
| May 2025 | 227 | 20 | 3 | X2.4 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2025-05-14 | 08:04 | 08:19 | 27 | X2.4 | – | – |
| 2025-05-13 | 15:25 | 15:38 | 19 | X1.1 | – | – |
| 2025-05-25 | 01:40 | 01:52 | 17 | X1.1 | – | – |
| 2025-05-25 | 16:18 | 16:30 | 18 | M8.9 | – | – |
| 2025-05-30 | 23:31 | 00:05 | 121 | M8.1 | – | – |
| 2025-05-14 | 11:04 | 11:19 | 28 | M7.5 | – | – |
| 2025-05-14 | 03:05 | 03:25 | 30 | M5.2 | – | – |
| 2025-05-14 | 17:59 | 18:11 | 19 | M4.6 | – | – |
| 2025-05-31 | 08:08 | 08:18 | 15 | M4.5 | – | – |
| 2025-05-25 | 10:05 | 10:18 | 20 | M3.4 | – | – |
| 2025-05-30 | 05:56 | 06:13 | 23 | M3.4 | – | – |
| 2025-05-19 | 08:13 | 08:21 | 13 | M3.1 | – | – |
| 2025-05-26 | 12:50 | 13:06 | 25 | M2.9 | – | – |
| 2025-05-31 | 15:36 | 15:49 | 21 | M2.9 | – | – |
| 2025-05-31 | 05:12 | 05:18 | 8 | M2.4 | – | – |
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
250 flares of class C or larger in May 2025; by M/X count it ranks 144 of 565 months.