Temperature
Cool by day, cold at night.
52°Ftypical September high
Typical range
September climate
September in Katmai National Park
United States · North America
Cool days and some sun.
Some tradeoffs
Daytime high
52°F
Lows around 43°F
Precipitation
19 days/mo
Sun
6 h/day
Air feel
Very dry
When to visit
Month-by-month fit
Best
Precipitation
Some precipitation is expected this month.
63%wet-day frequency
Precip amountWet-day chanceSnowfall
Sunshine
Cloudier spells limit sunshine.
6.2 hSeptember sunshine
Heat & humidity by month
Humidity is rarely noticeable in the cool air.
Very drySeptember Heat feel
Easy airHumid air
Hourly temperature pattern
In September, afternoons feel about 47° and nights feel near 42°.
FrigidFreezingVery coldColdCoolNight hours
Clear sky
Overcast skies this month.
15%September Clear sky
Clear skyCloud
Wind pattern
Calm winds are typical in September.
4 mphSeptember Calm
More detailIncludes daypart comfort
Typical September day
September late afternoons are around 52°F, easing to about 50°F in early evening.
Avg temp Typical range
Morning46°F
Rain40%
Cloud89%
Humid airLow
Sun intensityMinimal
Midday49°F
Rain41%
Cloud84%
Humid airLow
Sun intensityLow
Late afternoon52°F
Rain44%
Cloud82%
Humid airLow
Sun intensityLow
Early evening49°F
Rain42%
Cloud80%
Humid airLow
Sun intensityMinimal
Best windowData tableView month-by-month numbers
View month-by-month numbers
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 31 | 22 | 6.4 | 19 | 3.3 | 83 |
| Feb | 34 | 24 | 6.4 | 18 | 4.8 | 84 |
| Mar | 34 | 22 | 4.0 | 17 | 7.9 | 81 |
| Apr | 39 | 29 | 5.0 | 16 | 9.5 | 82 |
| May | 46 | 37 | 4.8 | 18 | 11.0 | 83 |
| Jun | 58 | 46 | 3.5 | 15 | 10.1 | 83 |
| Jul | 61 | 51 | 4.1 | 16 | 8.0 | 86 |
| Aug | 60 | 50 | 4.4 | 18 | 7.2 | 88 |
| Sep | 52 | 43 | 5.3 | 19 | 6.2 | 88 |
| Oct | 43 | 34 | 6.9 | 19 | 4.7 | 88 |
| Nov | 30 | 20 | 4.1 | 16 | 3.3 | 87 |
| Dec | 29 | 19 | 6.4 | 18 | 2.4 | 85 |
Similar climates
Similar
Similar travel styleAnchorageUnited StatesSimilar travel styleGlacier National ParkUnited StatesSimilar travel styleYellowstone National ParkUnited StatesSimilar travel styleNuukGreenland
Want a side-by-side climate view? Compare Katmai National Park with Anchorage.
Climate data notePlanning guidance, not a forecast
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Jul 31, 2026
Data & methodology