30YearWeather
Denver in September
Denver weather in September - United States
😊Warm & Pleasant

Denver Weather in September

Plan your September trip to Denver, United States. Based on 30 years of NASA data, expect temperatures of 26°C (high) to 10°C (low), with 12% rain probability and 8 hours of daily sunshine. Great conditions with only 0 rainy days expected.

Avg High
26°C

Hottest around day 2

Avg Low
10°C

Coolest around day 26

Rainy Days
0days

12% avg rain chance

Sunshine
8hrs/day

Autumn season

Denver September Weather Calendar

Click any day to see detailed weather information

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Denver

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Major Hub
100/ 100
Traffic Index

Extremely busy airport

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Nov

Monthly Traffic Distribution

921
Jan
958
Feb
1032
Mar
1054
Apr
1126
May
1095
Jun
1085
Jul
1160
Aug
1109
Sep
985
Oct
837
Nov
921
Dec
Traffic Level
Low Season

Key Connections

Phoenix Sky Harbor (PHX)
Los Angeles (LAX)
Salt Lake City (SLC)
Las Vegas McCarran (LAS)
Dallas-Fort Worth (DFW)

Health & Safety Advisory

CDC travel health recommendations

No Requirements

No Special Vaccinations Required

Standard travel precautions apply

Source: CDC Travelers' Health

View Complete Health Guide

Is September a Good Time to Visit Denver?

👍Recommended for planning your trip
Short Answer

Denver's September delivers on its reputation: 26°C, 12% rain, 10.6h sunshine. The trade-off? Peak crowds and prices at 96% capacity.

Decision Factors

Peak tourist season

96% of annual peak - expect crowds and peak prices

Ideal temperature range

26°C - perfect for sightseeing and outdoor activities

Excellent dry conditions

Only 12% rain probability - ideal for outdoor activities

Large day-night temperature swing

10.3°C to 26°C - pack layers

Comfortable humidity levels

48% humidity - pleasant conditions

Plenty of sunshine

10.6h of sunshine daily

Good For

  • 👨‍👩‍👧‍👦
    Families with children

    Comfortable 26°C temperatures and low 12% rain risk

  • 👴
    Elderly travelers

    Comfortable 26°C temperature range with manageable humidity

  • 🥾
    Outdoor enthusiasts

    Ideal hiking conditions: 26°C, 12% rain chance

  • 📸
    Photographers

    10.6h sunshine, 65% clear skies for golden hour shots

  • 🏛️
    Cultural tourists

    Comfortable conditions for exploring museums and sites

Who Should Avoid

  • 💰
    Budget travelers

    Peak season means premium prices everywhere

900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Denver in September averages 26°C with 12% precipitation probability."

📊 Source: 30YearWeather.com🛰️ Data: NASA POWER (1991-2021)View Methodology →

Frequently Asked Questions: Denver in September

What are the temperatures in Denver in September?

Daytime highs average 26°C, nights drop to 10°C. There's a significant day/night temperature swing.

How many rainy days in Denver in September?

Expect around 0 days with measurable rainfall. Rain is unlikely to disrupt plans.

What to wear in Denver in September?

Comfortable casual wear with a light jacket for evenings.

Is September peak season in Denver?

This is typically peak season with higher prices. Book 2-3 months ahead.