St. Helens, OR
Climate overview — based on NOAA 1991-2020 normals from SAINT HELENS RFD, OR US.
Year-round temperatures (°F)
Avg high
Avg low
Climate summary
St. Helens has an annual average temperature of 51.6°F with about 0 inches of precipitation per year. The warmest month is August (average high 79.3°F), and the coldest is January (average low 32.9°F).
Pleasant months
4 / 12
avg high 65–80°F, low ≥ 50°F
Annual swing
29.5°F
warmest to coldest month
Best time to visit St. Helens
Full guide →Climate change signal
All-time records →0 of 366 (0%) of St. Helens'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.
| 1970s | 37 | |
| 1980s | 88 | |
| 1990s | 137 | |
| 2000s | 98 | |
| 2010s | 6 |
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 | 43.2°F | 32.9°F | 38.0°F | in | — | — |
| February | 47.1°F | 33.2°F | 40.2°F | in | — | — |
| March | 52.9°F | 36.1°F | 44.5°F | in | — | — |
| April | 58.7°F | 40.1°F | 49.4°F | in | — | — |
| May | 66.6°F | 46.1°F | 56.3°F | in | — | — |
| June | 71.6°F | 50.4°F | 61.0°F | in | — | — |
| July | 78.8°F | 55.0°F | 66.9°F | in | — | — |
| August | 79.3°F | 54.9°F | 67.1°F | in | — | — |
| September | 73.5°F | 51.9°F | 62.7°F | in | — | — |
| October | 60.5°F | 44.7°F | 52.6°F | in | — | — |
| November | 49.0°F | 37.7°F | 43.3°F | in | — | — |
| December | 42.0°F | 33.1°F | 37.6°F | in | — | — |
Last spring / first fall frost
All-time recordsHottest, coldest, wettest
Planting calendarWhat to plant, and when