Newcastle city, Washington

Official LSAD Designation: Newcastle city • Census GEOID: 5348645 • King County

Climate Normals & Weather Observations

30-year climate normals (1991–2020) and weather observations for Newcastle city.

Reference Weather Station: RENTON MUNI AP, WA US (ID: USW00094248) • Located 3.7 miles from community center • Elevation: 8.8 m

Month	Average High (°F)	Average Low (°F)	Mean Temp (°F)	Precipitation (in)
January	48.0°	37.1°	42.5°	4.93"
February	50.4°	36.9°	43.6°	3.21"
March	54.7°	39.5°	47.1°	3.74"
April	59.5°	43.1°	51.3°	2.83"
May	66.3°	48.9°	57.6°	1.86"
June	71.0°	53.6°	62.3°	1.47"
July	77.2°	57.5°	67.3°	0.60"
August	77.6°	57.4°	67.5°	0.89"
September	71.6°	53.1°	62.4°	1.53"
October	61.0°	46.4°	53.7°	3.49"
November	52.4°	40.1°	46.2°	5.61"
December	47.0°	36.6°	41.8°	4.53"

2010–2025, completed calendar years only.

NOAA station RENTON MUNI AP, WA US (ID: USW00094248) • 3.7 miles from community center .

This is the same reference station used for monthly normals.

Show annual mean of daily highs and lows

Annual mean Annual mean of daily highs Annual mean of daily lows

Annual temperature data table (°F)

Annual station temperatures, 2010–2025. Unavailable means no reported value.
Year	Annual mean (°F)	Annual mean of daily highs (°F)	Annual mean of daily lows (°F)
2010	53.3	60.5	46.0
2011	51.6	58.8	44.3
2012	53.3	60.7	45.9
2013	53.1	60.3	45.9
2014	55.1	62.8	47.4
2015	55.8	63.9	47.8
2016	55.7	63.4	47.9
2017	53.7	61.6	45.9
2018	55.2	62.9	47.4
2019	54.0	61.8	46.3
2020	54.1	61.7	46.4
2021	54.3	62.0	46.5
2022	53.8	61.5	46.0
2023	54.9	62.8	46.9
2024	Unavailable	Unavailable	Unavailable
2025	Unavailable	Unavailable	Unavailable

Source: NOAA NCEI 1991–2020 U.S. Climate Normals, National Weather Service.