Visit San Diego in September? Score 8.8/10 [2026]

Month summary

San Diego weather in September

✅ Good

🌡️ Temperature min / max

18°C – 24°C

🌧 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°C, little rain).

❌ No if: you want to avoid tourist crowds — this is the busiest period.

🌧 Rain : ░░░░░░░░░░ 4%

🌡 Temperature : ██████░░░░ 24°C

☀️ Sunshine : ████████░░ 11.3h/d

Our take: San Diego in September: 24°C and 11.3h of sunshine. Decent, but not the peak.

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

🎯 Ideal beach temperature (25°C) — crowds still moderate Autumn in San Diego is often underrated: 24°C, 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.

Browse by month

All months for San Diego

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Annual table

Month-by-month comparison

Month	Min °C	Max °C	Rain %	Precip mm	Sun h/d	Score
⛅ January	8°C	17°C	20%	2.4	9.9h	7.2/10
⛅ February	9°C	17°C	18%	2.0	10.0h	7.2/10
⛅ March	10°C	17°C	28%	2.1	11.2h	7.2/10
🌤️ April	13°C	19°C	12%	0.7	12.0h	7.8/10
🌤️ May	14°C	20°C	10%	0.4	11.7h	8.0/10
🌤️ June	16°C	22°C	2%	0.1	12.0h	8.6/10
🌤️ July	18°C	24°C	0%	0.1	12.5h	9.1/10
☀️ August	19°C	25°C	2%	0.2	12.0h	9.1/10
🌤️ September	18°C	24°C	4%	0.5	11.3h	8.8/10
🌤️ October	15°C	23°C	7%	0.4	10.8h	8.5/10
🌤️ November	12°C	21°C	11%	1.2	9.8h	7.9/10
🌤️ December	9°C	18°C	16%	1.8	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 24°C, 4% rainy days and 11.3h of sunshine per day. Overall weather score: 8.8/10. See methodology →

Comparison