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Weather & Climate
Saint Helens, Oregon, United States
Overview
Climate data and monthly weather averages for Saint Helens.
Key Metrics
Annual Avg
9.4°C
Summer Avg
16.8°C
Winter Avg
2.5°C
Record High
39.8°C
Record Low
-14.8°C
Annual Precipitation
1712.5 mm
Avg Humidity
83%
Summer Humidity
74%
Winter Humidity
92%
Monthly Averages
| Month | High (°C) | Avg (°C) | Low (°C) | Rain (mm) | Humidity (%) | Sunshine (h) | Wind (kph) |
|---|---|---|---|---|---|---|---|
| Jan | 15.5° | 2.5° | -14.8° | 252.7 | 93% | 37 | 24.6 |
| Feb | 16.4° | 3° | -12.4° | 162.7 | 90% | 58 | 22.5 |
| Mar | 20.7° | 5.1° | -7° | 203.4 | 89% | 93 | 20.6 |
| Apr | 29.5° | 7.5° | -5.5° | 135.3 | 85% | 129 | 22.6 |
| May | 35° | 11.3° | -1.4° | 89.9 | 83% | 169 | 20 |
| Jun | 38° | 13.8° | 3.3° | 63.3 | 82% | 180 | 14.4 |
| Jul | 39.8° | 17.9° | 5.5° | 15.2 | 73% | 212 | 15.8 |
| Aug | 39.7° | 18.6° | 5° | 26.7 | 67% | 180 | 19.7 |
| Sep | 37.9° | 15.5° | -0.5° | 68.7 | 70% | 129 | 20.2 |
| Oct | 30.2° | 9.9° | -4.8° | 163.4 | 82% | 80 | 22 |
| Nov | 18° | 5.2° | -11.6° | 255.6 | 91% | 42 | 23.5 |
| Dec | 14.6° | 2° | -14.8° | 275.6 | 93% | 31 | 27.8 |
Frequently Asked Questions
Sources: NASA POWER · Last updated: 2025
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