Cool
Average highs are around 9°C, so pack for cooler days.
September verdict
Katmai National Park, United States in September
Weather score21Poor
Poor for holiday weather
Average highs are around 9°C, so pack for cooler days. Sunshine averages 5.2h per day, enough for a balanced month. Rainfall averages 104mm, so some wet days are possible.
September weather
Monthly averages
Temp
9°C
Rain
104mm
Sun
5.2h
Sea
11°C
Weather score
21
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 104mm, so some wet days are possible.
Some sun
Sunshine averages 5.2h per day, enough for a balanced month.
Cool sea
Sea temperatures average 11°C, so the water can feel cool.
Map
Weather map
Compare Katmai National Park, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September9°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September104mm average rain
September is one of Katmai National Park's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to July and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September5.2 hours average sun
September sits close to Katmai National Park's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to July
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September11°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 12°C in this stretch, so swimming comfort is at its strongest.
Weather score
September21 weather score
September scores below Katmai National Park's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsFebruary to July
These months have the strongest weather score in the monthly averages.