Weather on May 21 at Katmai
Katmai National Park and Preserve
AKAlaska200 ft elevation
Avg High59°F
Avg Low42°F
Warmest200263°F
Coldest197239°F
Based on 31 years of data from Anchorage, AK
Planning Your Visit
May 21st in Katmai National Park (via Anchorage, AK) typically brings cool spring weather, with average highs around 59°F and lows near 42°F. Over 31 years of records, the warmest May 21st was in 2002 (63°F average), while the coldest was 1972 (39°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 23% of May 21st dates historically. The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.2°F cooler on this date compared to 20-30 years ago.
Planning for May 21st in Katmai? Bring layers as temperatures can vary throughout the day.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 56°F | 44°F | 0" | -- |
| 2024 | 50°F | 42°F | 0.15" | -- |
| 2023 | 61°F | 43°F | 0" | -- |
| 2022 | 70°F | 42°F | 0" | -- |
| 2021 | 56°F | 44°F | 0.03" | -- |
| 2020 | 60°F | 46°F | 0" | -- |
| 2019 | 61°F | 43°F | 0" | -- |
| 2018 | 61°F | 43°F | 0" | -- |
| 2017 | 50°F | 44°F | 0.08" | -- |
| 2016 | 53°F | 46°F | 0.1" | -- |
| 2015 | 61°F | 43°F | 0" | -- |
| 2014 | 65°F | 40°F | 0" | -- |
| 2013 | 53°F | 33°F | 0" | -- |
| 2012 | 63°F | 46°F | 0" | -- |
| 2011 | 66°F | 42°F | 0" | -- |
| 2010 | 67°F | 42°F | 0" | -- |
| 2009 | 61°F | 43°F | 0" | -- |
| 2008 | 58°F | 40°F | 0" | -- |
| 2007 | 60°F | 39°F | 0" | -- |
| 2006 | 58°F | 44°F | 0" | -- |
| 2005 | 54°F | 49°F | 0.25" | -- |
| 2004 | 67°F | 44°F | 0" | -- |
| 2003 | 64°F | 38°F | 0" | -- |
| 2002 | 78°F | 49°F | 0" | 0" |
| 2001 | 59°F | 44°F | 0" | 0" |
| 2000 | 55°F | 37°F | 0" | -- |
| 1999 | 63°F | 40°F | 0.03" | 0" |
| 1998 | 54°F | 40°F | 0" | 0" |
| 1973 | 56°F | 36°F | 0" | 0" |
| 1972 | 46°F | 32°F | 0.13" | 0" |
| 1971 | 48°F | 36°F | 0" | 0" |
May 21 at Nearby Parks
Holiday Weather at Katmai
Official NPS WebsiteVisit nps.gov/katm for park information, alerts, and reservations
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