Rainfall totals San Luis Obispo, CA
For San Luis Obispo, the station record shows 8.78 inches of rain for the year to date in 2026. The normal for the same date is 12.28 inches.
Data from San Luis Obispo McChesney Field, with records back to 1998.
Days with measurable rain, 2026
| Date | Rainfall |
|---|---|
| May 28, 2026 | 0.38 inches |
| Apr 25, 2026 | 0.24 inches |
| Apr 21, 2026 | 0.56 inches |
| Apr 12, 2026 | 0.05 inches |
| Apr 11, 2026 | 0.74 inches |
| Apr 10, 2026 | 0.12 inches |
| Feb 19, 2026 | 0.78 inches |
| Feb 18, 2026 | 0.13 inches |
| Feb 17, 2026 | 0.95 inches |
| Feb 16, 2026 | 1.76 inches |
| Feb 11, 2026 | 0.29 inches |
| Feb 10, 2026 | 0.46 inches |
| Jan 4, 2026 | 0.74 inches |
| Jan 3, 2026 | 1.12 inches |
| Jan 2, 2026 | 0.09 inches |
| Jan 1, 2026 | 0.37 inches |
Through Aug 19, 2026, the GHCN-Daily station record shows 8.78 inches of measurable rain so far this year, falling over a 16-day span. Station observations are from GHCN-Daily, with a 1-3 day lag and quality checks by NOAA.
All-time rainfall records
| Wettest day | 4.04 inches | Jan 9, 2023 |
|---|---|---|
| Wettest year | 33.04 inches | 2010 |
| Driest year | 3.17 inches | 2013 |
| Average year | 16.09 inches | 27 complete years on record |
| Rain days a year | 52 | average, 0.01 inch or more |
| Record begins | 1998 | 10,350 daily readings |
Monthly rainfall normals
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Inches | 3.86 | 3.54 | 3.17 | 1.05 | 0.47 | 0.10 | 0.08 | 0.01 | 0.04 | 0.92 | 1.43 | 3.27 | 17.94 |
Averages are 1991-2020 normals from NCEI.
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