San Diego · AutumnMonth summary
San Diego weather in September
✅ Good
🌡️ Temperature min / max
64°F – 75°F
🌧 Rainy days
4% of days
☀️ Sunshine
11.3h per day on average
🌊 🌊 Season
Autumn
⭐ ⭐ Weather score
8.8/10
📅 📅 Best month
July (9.1/10)
Quick decision
Should you visit San Diego in September?
✅ Good
✅ Yes if: you want to combine beach, sightseeing and hiking — versatile weather (24°F, little rain).
❌ No if: you want to avoid tourist crowds — this is the busiest period.
Our take: Favourable conditions in September (8.8/10). July scores higher but the gap is small.
By trip type
San Diego in September by trip type
- 🏙️ 🏙️ City break / culture : ✅ Good
- 🚶 🚶 Outdoor activities : ✅ Good
- 🏖️ Beach / swimming : ⚠️ Possible
- 💰 💰 Budget : 💸 Peak season
Local context
What to expect in September
Autumn in San Diego is often underrated: 24°F, golden light and declining crowds. An interesting window. Rain is virtually absent (4% of days) — ideal for planning without a backup. A good balance between weather and crowds, even if July (9.1/10) remains theoretically better.
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All months for San Diego
Annual table
Month-by-month comparison
| Month | Min °F | Max °F | Rain % | Precip in | Sun h/d | Score |
|---|---|---|---|---|---|---|
| ⛅ January | 46°F | 63°F | 20% | 0.1in | 9.9h | 7.2/10 |
| ⛅ February | 48°F | 63°F | 18% | 0.1in | 10.0h | 7.2/10 |
| ⛅ March | 50°F | 63°F | 28% | 0.1in | 11.2h | 7.2/10 |
| 🌤️ April | 55°F | 66°F | 12% | 0.0in | 12.0h | 7.8/10 |
| 🌤️ May | 57°F | 68°F | 10% | 0.0in | 11.7h | 8.0/10 |
| 🌤️ June | 61°F | 72°F | 2% | 0.0in | 12.0h | 8.6/10 |
| 🌤️ July | 64°F | 75°F | 0% | 0.0in | 12.5h | 9.1/10 |
| ☀️ August | 66°F | 77°F | 2% | 0.0in | 12.0h | 9.1/10 |
| 🌤️ September | 64°F | 75°F | 4% | 0.0in | 11.3h | 8.8/10 |
| 🌤️ October | 59°F | 73°F | 7% | 0.0in | 10.8h | 8.5/10 |
| 🌤️ November | 54°F | 70°F | 11% | 0.0in | 9.8h | 7.9/10 |
| 🌤️ December | 48°F | 64°F | 16% | 0.1in | 9.5h | 7.3/10 |
Ideal
Fair
Challenging climate
◀ Current month · Source Open-Meteo · 10 years
📊 Data source
Data based on 10 years of ERA5 records via Open-Meteo, with ECMWF seasonal adjustment. In September, San Diego averages 75°F, 4% rainy days and 11.3h of sunshine per day. Overall weather score: 8.8/10.
See methodology →
Comparison
September vs July (best month)
The best month is July (score 9.1/10). Difference:
- 🌡️ Max temperature : +0°F
- 🌧 Rainy days : -4%
- ☀️ Sunshine : +1.2h/day
FAQ
FAQ — San Diego in September
Is September a good time to visit San Diego?
September is an excellent time to visit San Diego (score 8.8/10). With 75°F, 11.3h of sunshine and 4% rain, conditions are very favourable.
What to do in San Diego in September?
With 75°F and 11.3h of sunshine, all outdoor activities are possible: hiking, sightseeing and terraces.
Accommodation
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Activities & tours
Activities and tours in San Diego
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