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San Francisco vs San Diego: which is better, and when to go
San Francisco is at its best in September and San Diego in October. Below, the two cities side by side: weather, crowds and prices in every month, and what each does better across the year.
By Daan · Last reviewed October 2026
San Francisco and San Diego
At a glance
| San Francisco | San Diego | |
|---|---|---|
| Best month | September (7/10) | October (7.5/10) |
| Warmest month | September, 21°C | August, 25°C |
| Coolest month | January, 14°C | January, 19°C |
| Quietest month | January (Low–Moderate) | January (Low–Moderate) |
| Busiest month | July (High) | July (High) |
| Cheapest month | January ($$) | November ($$) |
Which one should you choose?
Choose San Francisco for
- a gentler warmest month (September highs around 21°C, against 25°C)
Choose San Diego for
- a milder coolest month (January highs around 19°C, against 14°C)
Little difference between them in: crowds across the year, how busy the peak month gets, prices across the year, events through the year.
Month by month
Average high, crowds and prices for each month, and which city comes out ahead overall. Open a month for the full comparison.
| Month | San Francisco | San Diego | Ahead |
|---|---|---|---|
| January | 14°C · Low–Moderate · $$ | 19°C · Low–Moderate · $$ | Close |
| February | 16°C · Low–Moderate · $$ | 19°C · Low–Moderate · $$ | Close |
| March | 17°C · Moderate · $$ | 19°C · Moderate · $$$ | San Diego |
| April | 17°C · Moderate · $$$ | 20°C · Moderate · $$ | San Diego |
| May | 18°C · Moderate–High · $$$ | 21°C · Moderate · $$$ | San Diego |
| June | 19°C · High · $$$$ | 22°C · Moderate–High · $$$ | San Diego |
| July | 19°C · High · $$$$ | 24°C · High · $$$$ | San Diego |
| August | 20°C · High · $$$$ | 25°C · High · $$$$ | San Diego |
| September | 21°C · Moderate–High · $$$ | 25°C · Moderate · $$$ | Close |
| October | 21°C · Moderate · $$$ | 24°C · Low–Moderate · $$ | San Diego |
| November | 18°C · Low–Moderate · $$ | 22°C · Low–Moderate · $$ | San Diego |
| December | 14°C · Low–Moderate · $$ | 19°C · Moderate · $$$ | San Diego |
FAQ
San Francisco or San Diego?
Is San Francisco or San Diego better?
It depends on when you go. San Francisco is at its best in September and San Diego in October. The month-by-month table shows which city comes out ahead in each month.
When is the best time to visit San Francisco and San Diego?
San Francisco: September–October. San Diego: September–October.
Which is cheaper, San Francisco or San Diego?
Prices are similar across the year. Check each month for the difference.