Newcastle, WA
Climate overview — based on NOAA 1991-2020 normals from RENTON MUNI AP, WA US.
Year-round temperatures (°F)
Climate summary
Newcastle has an annual average temperature of 53.6°F with about 34.7 inches of precipitation per year. The warmest month is August (average high 77.6°F), and the coldest is December (average low 36.6°F). November is typically the wettest month (5.61 in) and July the driest (0.60 in).
Best time to visit Newcastle
Full guide →Climate change signal
All-time records →197 of 366 (53.8%) of Newcastle's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1990s | 16 | |
| 2000s | 115 | |
| 2010s | 133 | |
| 2020s | 102 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 48.0°F | 37.1°F | 42.5°F | 4.93 in | — | 18 |
| February | 50.4°F | 36.9°F | 43.6°F | 3.21 in | — | 16 |
| March | 54.7°F | 39.5°F | 47.1°F | 3.74 in | — | 18 |
| April | 59.5°F | 43.1°F | 51.3°F | 2.83 in | — | 14 |
| May | 66.3°F | 48.9°F | 57.6°F | 1.86 in | — | 11 |
| June | 71.0°F | 53.6°F | 62.3°F | 1.47 in | — | 9 |
| July | 77.2°F | 57.5°F | 67.3°F | 0.60 in | — | 4 |
| August | 77.6°F | 57.4°F | 67.5°F | 0.89 in | — | 5 |
| September | 71.6°F | 53.1°F | 62.4°F | 1.53 in | — | 9 |
| October | 61.0°F | 46.4°F | 53.7°F | 3.49 in | — | 15 |
| November | 52.4°F | 40.1°F | 46.2°F | 5.61 in | — | 17 |
| December | 47.0°F | 36.6°F | 41.8°F | 4.53 in | — | 17 |
Climate twins of Newcastle
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).