Weather on September 20 at Katmai
Katmai National Park and Preserve
Based on 29 years of data from Anchorage, AK
Planning Your Visit
September 20th in Katmai National Park (via Anchorage, AK) typically brings cool fall weather, with average highs around 54°F and lows near 42°F. Over 29 years of records, the warmest September 20th was in 2016 (55°F average), while the coldest was 2003 (39°F) — a 16°F range across recorded history. Rain or other precipitation has occurred on about 62% of September 20th dates historically, with the wettest September 20th recording 3.2" of rain. The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.2°F warmer on this date compared to 20-30 years ago.
Planning for September 20th 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 | 60°F | 47°F | 0" | -- |
| 2024 | 52°F | 37°F | 0.03" | -- |
| 2023 | 48°F | 44°F | 3.2" | -- |
| 2022 | 52°F | 47°F | 1.02" | -- |
| 2021 | 49°F | 37°F | 0" | -- |
| 2020 | 53°F | 42°F | 0.3" | -- |
| 2019 | 51°F | 48°F | 0.66" | -- |
| 2018 | 59°F | 47°F | 0.03" | -- |
| 2017 | 56°F | 36°F | 0" | -- |
| 2016 | 63°F | 47°F | 0" | -- |
| 2015 | 52°F | 30°F | 0" | -- |
| 2014 | 61°F | 44°F | 0.08" | -- |
| 2013 | 48°F | 30°F | 0" | -- |
| 2012 | 55°F | 50°F | 2.59" | -- |
| 2011 | 54°F | 47°F | 0.15" | -- |
| 2010 | 54°F | 45°F | 0" | -- |
| 2009 | 54°F | 40°F | 0" | -- |
| 2008 | 53°F | 44°F | 0.41" | -- |
| 2007 | 59°F | 48°F | 0.43" | -- |
| 2006 | 59°F | 45°F | 0.05" | -- |
| 2005 | 61°F | 43°F | 0" | -- |
| 2004 | 50°F | 40°F | 0.99" | -- |
| 2003 | 43°F | 35°F | 0.41" | 0" |
| 2002 | 51°F | 35°F | 0.15" | 0" |
| 2001 | 63°F | 45°F | 0" | 0" |
| 2000 | 54°F | 36°F | 0.3" | -- |
| 1999 | 52°F | 45°F | 0.64" | 0" |
| 1998 | 59°F | 49°F | 0.28" | 0" |
| 1971 | 52°F | 45°F | 0" | 0" |