September 20 is statistically one of the best days of the year in Phoenix. With minimal rain risk (9%) and pleasant highs of 37°C, it's ideal for outdoor adventures. Phoenix is seeing high visitor numbers, so iconic spots may be busier than usual.
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Essential Travel Info for Phoenix
Currency
USD
$ United States dollar
Language
English
Driving
Right side
Safety
Moderate Safety
GPI: 2.44
Phoenix Weather Forecast for September 20
"Warm & Sunny. Expect average highs of 36.5°C. 9% chance of rain."
What to Wear in Phoenix in September
Based on historical data for September 20, Phoenix typically experiences temperatures between 22.9°C and 36.5°C. We recommend packing t-shirt, light clothing, layers (onion system) to stay comfortable. Trends suggest it will stay mostly dry (9% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Phoenix
Smart Suitcase
- T-Shirt
- Light Clothing
- Layers (Onion System)
Average High
36.5°C
Daytime Peak
Average Low
22.9°C
Nighttime Low
Feels Like
36.5°C
🔥 Feels accurate
Rain Chance
9%
Avg 0.2mm if it rains
Cloud Cover
17%
Clear sky
Pressure
1008.9 hPa
Low volatility
Phoenix Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 97% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 17 min to burn
Type III-IV
🟡 26 min to burn
Type V-VI
🟢 43 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
16.6°C
Noticeable
Heat Stress
Low
No heat warning
😕 Best outdoor time:
Early morning (6-9 AM) or evening (after 6 PM)
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in United States
Flight Traffic
Busy
74/100 pressure index
Health Advisory
Healthy
Routine only • View Details →
Landing Slots
~604
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Phoenix
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:16
☀️ Noon
12:23
🌇 Sunset
18:29
⏱️ Daylight
12h 13m
Wind Speed
13.2 km/h
Gentle breeze
Sunshine
10.8 hrs
Direct Sun (Cloud-free)
Humidity
31%
Comfortable
Travel Intelligence
Exclusive flight analytics & health data for Phoenix
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
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Travel Health & Safety in Phoenix
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.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is acceptable. Sensitive individuals should limit prolonged outdoor exertion.
Regional Safety Profile
Seismic Activity
Rare minor tremors. Buildings are earthquake-resistant.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Phoenix on September 20 averages 36.5°C with a 9% precipitation probability. Wedding/Outdoor Event Score: 87/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Phoenix Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 23
35.8°C • 7% rain
Score
90
September 24
35.8°C • 9% rain
Score
90
September 25
35.8°C • 9% rain
Score
90
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 20) in other destinations
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🌍 Explore the same date in different destinations around the world
📍 Is Phoenix Worth Visiting on September 20?
Planning a trip to Phoenix on September 20? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year typically offers vibrant summer conditions averaging 36.5°C with a 9% historical precipitation risk.
✈️ Travel Logistics: Approximately 604 landing slots available daily during this period, indicating peak tourist activity.
📊 Historical Extremes: The hottest September 20 recorded in the last 30 years saw temperatures hit 39.6°C in 2020, while the coldest dropped to 20.8°C in 2023.