Ketchikan in September
In September, Ketchikan averages 15°C (59°F) during the day and 10°C (50°F) at night, with frequent rain — about 22 days of the month see precipitation (343 mm total).
Off-peakConditions are cool — bring a jacket for evenings. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in Ketchikan during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Ketchikan
September is in the middle of the year for warmth in Ketchikan (4th of 12) and moderately rainy compared to the rest of the year (7th of 12). Daytime temperature runs 5°C above the annual average (10°C). September runs 3°C cooler than August (18°C) and cools 5°C in October (10°C).
September sunrise & sunset in Ketchikan
Times shown for Ketchikan local time (America/Sitka), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Ketchikan — September
Golden-hour and blue-hour windows for the 15th of September, in Ketchikan's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Ketchikan in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Off-peak) and Ketchikan's popularity.
Crowds & pricing — September in Ketchikan
This is off-peak for Ketchikan — the lowest prices of the year and the fewest crowds, but with real trade-offs: some restaurants, hotels, and beach businesses may close for the season; weather conditions can make outdoor activities unpredictable; and a handful of seasonal sights run reduced hours or close entirely. Great if you prefer a quiet local rhythm and don't mind the climate giving you reasons to choose indoor activities.
Why this tier: peak hazard season (1 active)
Sun & mosquito risk — September in Ketchikan
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Ketchikan in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 4°C / 39°F | 0°C / 32°F | 366 mm | 23 | — |
| February | 4°C / 38°F | -1°C / 30°F | 251 mm | 19 | — |
| March | 6°C / 43°F | 0°C / 33°F | 255 mm | 21 | — |
| April | 9°C / 49°F | 3°C / 38°F | 281 mm | 23 | — |
| May | 14°C / 58°F | 8°C / 46°F | 151 mm | 19 | — |
| June | 16°C / 61°F | 10°C / 50°F | 174 mm | 22 | — |
| July | 19°C / 65°F | 13°C / 55°F | 179 mm | 22 | — |
| August | 18°C / 65°F | 13°C / 55°F | 283 mm | 21 | — |
| September | 15°C / 59°F | 10°C / 50°F | 343 mm | 22 | — |
| October | 10°C / 51°F | 6°C / 43°F | 372 mm | 23 | — |
| November | 6°C / 43°F | 2°C / 36°F | 401 mm | 25 | — |
| December | 3°C / 38°F | -1°C / 31°F | 333 mm | 21 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Ketchikan in September →
Frequently asked questions
How hot is Ketchikan in September?
In September, Ketchikan averages a high of 15°C (59°F) and a low of 10°C (50°F) — generally cool.
Does it rain a lot in Ketchikan in September?
September is quite rainy in Ketchikan, with about 22 rainy days on average.
Is September a good time to visit Ketchikan?
September is cool but on the rainy side. It suits travelers who are comfortable with cool weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Ketchikan in September?
Pack a warm jacket and layers, plus a compact umbrella or rain jacket. See the full September packing list for Ketchikan for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.