Weather on September 18 at Katmai
Katmai National Park and Preserve
Based on 30 years of data from Anchorage, AK
Planning Your Visit
September 18th in Katmai National Park (via Anchorage, AK) typically brings cool fall weather, with average highs around 56°F and lows near 43°F. Over 30 years of records, the warmest September 18th was in 1999 (55°F average), while the coldest was 2004 (39°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 43% of September 18th dates historically, with the wettest September 18th recording 0.99" of rain. The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.2°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Katmai? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 56°F | 44°F | 0.69" | -- |
| 2024 | 52°F | 43°F | 0.1" | -- |
| 2023 | 54°F | 39°F | 0" | -- |
| 2022 | 56°F | 41°F | 0.03" | -- |
| 2021 | 57°F | 38°F | 0.2" | -- |
| 2020 | 58°F | 51°F | 0" | -- |
| 2019 | 58°F | 50°F | -- | -- |
| 2018 | 62°F | 49°F | 0" | -- |
| 2017 | 51°F | 47°F | 0.3" | -- |
| 2016 | 60°F | 46°F | 0" | -- |
| 2015 | 52°F | 35°F | 0.13" | -- |
| 2014 | 50°F | 48°F | 0.13" | -- |
| 2013 | 52°F | 44°F | 0.41" | -- |
| 2012 | 55°F | 47°F | 0.05" | -- |
| 2011 | 58°F | 44°F | 0" | -- |
| 2010 | 55°F | 45°F | 0" | -- |
| 2009 | 60°F | 41°F | 0" | -- |
| 2008 | 59°F | 47°F | 0" | -- |
| 2007 | 51°F | 46°F | 0.99" | -- |
| 2006 | 60°F | 37°F | 0" | -- |
| 2005 | 57°F | 47°F | 0" | -- |
| 2004 | 49°F | 30°F | 0" | -- |
| 2003 | 51°F | 35°F | 0" | -- |
| 2002 | 54°F | 40°F | 0" | 0" |
| 2001 | 57°F | 52°F | 0.23" | 0" |
| 2000 | 53°F | 29°F | 0" | 0" |
| 1999 | 61°F | 49°F | 0.13" | 0" |
| 1998 | 59°F | 48°F | 0.33" | 0" |
| 1972 | 56°F | 40°F | 0" | -- |
| 1971 | 57°F | 39°F | 0" | 0" |