30YearWeather
Juneau in September
Juneau weather in September - United States
🌧️Wet Season

Juneau Weather in September

Plan your September trip to Juneau, United States. Based on 30 years of NASA data, expect temperatures of 13°C (high) to 8°C (low), with 66% rain probability and 8 hours of daily sunshine. Pack rain gear for around 30 rainy days.

Avg High
13°C

Hottest around day 3

Avg Low
8°C

Coolest around day 30

Rainy Days
30days

66% avg rain chance

Sunshine
8hrs/day

Autumn season

Juneau September Weather Calendar

Click any day to see detailed weather information

Day 1
thunderstorm
Stormy
15°C64%
Day 2
thunderstorm
Stormy
15°C64%
Day 3
thunderstorm
Stormy
16°C61%
Day 4
thunderstorm
Stormy
15°C61%
Day 5
thunderstorm
Stormy
16°C62%
Day 6
thunderstorm
Stormy
15°C64%
Day 7
thunderstorm
Stormy
15°C66%
Day 8
thunderstorm
Stormy
15°C67%
Day 9
thunderstorm
Stormy
15°C66%
Day 10
thunderstorm
Stormy
15°C63%
Day 11
rain
Rainy
14°C60%
Day 12
rain
Rainy
14°C58%
Day 13
rain
Rainy
14°C56%
Day 14
rain
Rainy
14°C57%
Day 15
rain
Rainy
14°C58%
Day 16
rain
Rainy
14°C59%
Day 17
thunderstorm
Stormy
14°C61%
Day 18
thunderstorm
Stormy
13°C66%
Day 19
thunderstorm
Stormy
13°C68%
Day 20
thunderstorm
Stormy
13°C72%
Day 21
thunderstorm
Stormy
12°C74%
Day 22
thunderstorm
Stormy
12°C79%
Day 23
thunderstorm
Stormy
12°C79%
Day 24
thunderstorm
Stormy
12°C77%
Day 25
thunderstorm
Stormy
12°C77%
Day 26
thunderstorm
Stormy
12°C75%
Day 27
thunderstorm
Stormy
12°C70%
Day 28
thunderstorm
Stormy
11°C66%
Day 29
thunderstorm
Stormy
11°C64%
Day 30
rain
Rainy
11°C59%

Currency

USD

$ United States dollar

Language

English

Driving

Right side

Safety

Moderate Safety

GPI: 2.44

Travel Intelligence

Exclusive flight analytics & health data for Juneau

Smart Flight Estimator

Airport-to-Airport Logistics

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Flight Connectivity Analysis

Airport traffic data & seasonal patterns

Low Traffic
23/ 100
Traffic Index

Quieter airport

Peak Daily Arrivals

0

slots per day

Peak

Aug

Low

Oct

Monthly Traffic Distribution

37
Jan
22
Feb
23
Mar
25
Apr
23
May
12
Jun
12
Jul
58
Aug
15
Sep
5
Oct
11
Nov
32
Dec
Traffic Level
Low Season

Key Connections

Seattle Tacoma (SEA)
Haines (HNS)
Anchorage Ted Stevens (ANC)
Hoonah (HNH)
Sitka Rocky Gutierrez (SIT)

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 Juneau?

👌Worthwhile timing with some trade-offs
Short Answer

Monsoon conditions shape Juneau's September: expect 66% daily rain chance. Mornings often clear before afternoon showers - early starts recommended.

Decision Factors

High rainfall period

66% rain probability, 9.8mm average

Very high humidity

86% average humidity

Off-peak season - fewer crowds

Only 26% of peak - better deals and quiet crowds

Good For

  • 💰
    Budget travelers

    Off-peak pricing with acceptable weather conditions

  • 💼
    Business travelers

    Climate-controlled meetings unaffected by weather

Who Should Avoid

  • 🏖️
    Beach lovers

    Sea temperature only undefined°C - too cold for comfortable swimming

  • 👴
    Elderly travelers

    86% humidity creates difficult conditions

  • 🥾
    Outdoor enthusiasts

    66% rain probability disrupts outdoor activities

  • 📸
    Photographers

    81% cloud cover limits natural light opportunities

900 observations30-year historical data
Confidence: 95%

"According to 30YearWeather's analysis of 30 years of NASA POWER satellite data,Juneau in September averages 13°C with 66% precipitation probability."

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

Frequently Asked Questions: Juneau in September

What are the temperatures in Juneau in September?

Daytime highs average 13°C, nights drop to 8°C. Temperatures remain fairly consistent.

How many rainy days in Juneau in September?

Expect around 30 days with measurable rainfall. Definitely pack rain gear.

What to wear in Juneau in September?

Layers are key. A medium-weight jacket and closed-toe shoes.

Is September peak season in Juneau?

This is off-peak season. Expect lower prices and fewer crowds.