October 18 is statistically one of the best days of the year in San Antonio. With minimal rain risk (14%) and pleasant highs of 27°C, it's ideal for outdoor adventures. San Antonio is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for San Antonio
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Connect
As of Dec 2021, San Antonio has 5G from ...
Safety
Moderate Safety
GPI: 2.44
San Antonio Weather Forecast for October 18
"Warm & Sunny. Expect average highs of 27.1°C. 14% chance of rain."
What to Wear in San Antonio in October
Based on historical data for October 18, San Antonio typically experiences temperatures between 16.3°C and 27.1°C. We recommend packing t-shirt, light clothing to stay comfortable. Trends suggest it will stay mostly dry (14% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for San Antonio
Smart Suitcase
- T-Shirt
- Light Clothing
Average High
27.1°C
Daytime Peak
Average Low
16.3°C
Nighttime Low
Feels Like
28.4°C
🔥 Minor difference
Rain Chance
14%
Avg 0.7mm if it rains
Cloud Cover
36%
Overcast
Pressure
1017 hPa
Medium volatility
San Antonio Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
✓ Weather is generally predictable, but pack for minor variations. A light backup layer is recommended.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 15 for extended outdoor time
Type I-II
🔴 40 min to burn
Type III-IV
🟡 60 min to burn
Type V-VI
🟢 100 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
19.2°C
Noticeable
Heat Index
28.4°C
Feels hotter
😊 Best outdoor time:
Any time during daylight hours
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
High
83/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~135
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in San Antonio
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
07:38
☀️ Noon
13:20
🌇 Sunset
19:02
⏱️ Daylight
11h 23m
Wind Speed
15.3 km/h
Gentle breeze
Sunshine
8.9 hrs
Direct Sun (Cloud-free)
Humidity
62%
Slightly humid
Travel Intelligence
Exclusive flight analytics & health data for San Antonio
Smart Flight Estimator
Airport-to-Airport Logistics
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Travel Health & Safety in San Antonio
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰 Moderate
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, San Antonio on October 18 averages 27.1°C with a 14% precipitation probability. Wedding/Outdoor Event Score: 100/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
San Antonio Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
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📍 Is San Antonio Worth Visiting on October 18?
Planning a trip to San Antonio on October 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 27.1°C with a 14% historical precipitation risk.
✈️ Travel Logistics: Approximately 135 landing slots available daily during this period, indicating manageable crowd levels.
📊 Historical Extremes: The hottest October 18 recorded in the last 30 years saw temperatures hit 33.7°C in 2025, while the coldest dropped to 10.4°C in 2018.