SeasonMapPortland vs San Francisco: which is better, month by month
San Francisco beats Portland in 8 of 12 months — its lead peaks in November (80 vs 57) — while Portland wins June; they are within 3 points in May, July and September.
Each place is scored under the lens that suits its type. Comfort is SeasonMap's 0–100 estimate from ERA5 climate normals, not a forecast.
Portland vs San Francisco — all 12 months
| Month | Portland | San Francisco | Winner | Gap |
|---|---|---|---|---|
| January | 49Fcold, soaked, clean air | 68Ccool, rainy, clean air | San Francisco | 19 |
| February | 55Dcold, rainy, clean air | 75Bcool, rainy, muggy air | San Francisco | 20 |
| March | 65Ccool, rainy, clean air | 76Bcool, rainy, clean air | San Francisco | 11 |
| April | 76Bcool, rainy, clean air | 85Anice, a little rain, clean air | San Francisco | 9 |
| May | 86Anice, a little rain, clean air | 88Anice, dry, clean air | Tie | 2 |
| June | 96Swarm, a little rain, clean air | 92Snice, dry, clean air | Portland | 4 |
| July | 92Swarm, dry, clean air | 93Snice, dry, clean air | Tie | 1 |
| August | 89Awarm, dry, clean air | 95Snice, dry, clean air | San Francisco | 6 |
| September | 94Swarm, a little rain, clean air | 96Snice, dry, clean air | Tie | 2 |
| October | 72Bnice, rainy, clean air | 90Snice, dry, clean air | San Francisco | 18 |
| November | 57Dcool, soaked, clean air | 80Anice, a little rain, clean air | San Francisco | 23 |
| December | 45Fcold, soaked, clean air | 67Ccool, rainy, clean air | San Francisco | 22 |
A month is a tie when the two are within 3 points. The widest gap is November (57 vs 80). Tap a month for that month's temperature, rain, humidity and air quality side by side.