Ketchikan Weather in August

August in Ketchikan typically sees daytime highs of 17°C (63°F) and nighttime lows of 13°C (55°F). August falls within the rainy season, so heavy rainfall is to be expected. It falls within the summer season.

Rainfall in Ketchikan in August

As part of the rainy season, Ketchikan sees around 15 days of rain in August, with an average of 249 mm (9.8 in). With high rainfall totals spread across the month, individual showers can be very heavy. Waterproof gear is strongly recommended.

Temperature in Ketchikan in August

August in Ketchikan brings typical temperatures with highs around 17°C (63°F) and lows of 13°C (55°F). August is in the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions. On average, it sees the highest temps of the year.

Sunshine in Ketchikan in August

The area enjoys a balanced 147 hours of sunlight, ensuring it's neither too rainy nor too sunny.

If you prefer dry days with pleasant temperatures, August may not be the ideal month to visit Ketchikan. Our weather planner can help you explore destinations with more pleasant weather conditions.