September 30 is statistically one of the best days of the year in San Diego. With minimal rain risk (1%) and pleasant highs of 25°C, it's ideal for outdoor adventures. San Diego is seeing high visitor numbers, so iconic spots may be busier than usual.
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Essential Travel Info for San Diego
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
The most common area code for San Diego ...
Safety
Moderate Safety
GPI: 2.44
San Diego Weather Forecast for September 30
"Mild & Comfortable. Expect average highs of 24.5°C. 1% chance of rain."
What to Wear in San Diego in September
Based on historical data for September 30, San Diego typically experiences temperatures between 16.7°C and 24.5°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (1% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for San Diego
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
24.5°C
Daytime Peak
Average Low
16.7°C
Nighttime Low
Feels Like
25.3°C
☀️ Feels accurate
Rain Chance
1%
Avg 0mm if it rains
Cloud Cover
32%
Overcast
Pressure
1012.4 hPa
Low volatility
San Diego Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ This date historically delivers consistent weather 78% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
05:00 - 09:30
16:00 - 17:00
Type I-II
🔴 21 min to burn
Type III-IV
🟡 32 min to burn
Type V-VI
🟢 53 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
20°C
Humid/Sticky
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
⚠️ Mixed Conditions
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Busy
75/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~334
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Diego
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
05:43
☀️ Noon
11:39
🌇 Sunset
17:36
⏱️ Daylight
11h 53m
Wind Speed
14.9 km/h
Gentle breeze
Sunshine
10.4 hrs
Direct Sun (Cloud-free)
Humidity
76%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for San Diego
Smart Flight Estimator
Airport-to-Airport Logistics
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Add your home location in settings to see airport details.
Travel Health & Safety in San Diego
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Stable conditions. Low risk of headaches.
Mild discomfort possible for arthritic conditions.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Moderate seismic activity. Occasional tremors possible.
Eastern Pacific Hurricane Risk
Season: May - Nov
Travel Alert: This region has elevated natural risks. We recommend registering with your embassy and keeping emergency numbers handy.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, San Diego on September 30 averages 24.5°C with a 1% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
San Diego Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Compare Other Cities
Same date (September 30) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is San Diego Worth Visiting on September 30?
Planning a trip to San Diego on September 30? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 24.5°C with a 1% historical precipitation risk.
✈️ Travel Logistics: Approximately 334 landing slots available daily during this period, indicating manageable crowd levels.
🌊 Coastal Conditions: Water temperature averages 19°C (refreshing tonic). Wave conditions are generally fun waves with heights around 0.88m.
📊 Historical Extremes: The hottest September 30 recorded in the last 30 years saw temperatures hit 36.5°C in 2020, while the coldest dropped to 12.2°C in 2019.