Mount St. Helens, WA

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Mount Saint Helens from national monument visitor center, State of Washington
Mount Saint Helens from national monument visitor center, State of Washington - ArtBrom, CC BY-SA 2.0, via Wikimedia Commons

Today’s Forecast:

🌤
45°F
High: 45° | Low: 32°
Current Temperature
Station: CYFW1
Observed at: 10:52 pm CDT on 9/25/26
Wind: 1 mph | Humidity: 95%
Tonight:Mostly cloudy, with a low around 32. Northwest wind 5 to 8 mph.
Saturday:Widespread frost between 9am and noon. Mostly sunny, with a high near 41. North wind 1 to 8 mph.
Saturday Night:Mostly cloudy, with a low around 35. East northeast wind 2 to 12 mph.
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Today’s Report:

🥾 Hiking

Good
  80 /100

Good for hiking. High near 46°F. Light wind (12 mph).

  • Temp: Marginal weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Good 72/100
Good for hiking. High near 41°F. Light wind (8 mph).

⛺ Camping

Excellent
  85 /100

Excellent for camping. High near 46°F. Light wind (12 mph).

  • Temp: Marginal weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Use Caution 44/100
Use Caution for camping. High near 41°F. Light wind (8 mph). Cold overnight low (35°F).

🎪 Outdoor Events / Activities

Not Recommended
  20 /100

Not Recommended for outdoor events / activities. High near 46°F. Light wind (12 mph). Temperatures outside comfort limits (46°F).

  • Temp: Unfavorable weather factor
  • Rain: Favorable conditions
  • Wind: Favorable conditions
  • Thunderstorm: Favorable conditions
Tomorrow's Outlook:
Not Recommended 20/100
Not Recommended for outdoor events / activities. High near 41°F. Light wind (8 mph). Temperatures outside comfort limits (41°F).

About Mount St. Helens

Mount St. Helens is a Washington destination for the volcanic monument, blast-zone roads, observatory approaches, lakes, exposed trails, and remote forest access.

Make the Most of a Mount St. Helens Day

Confirm which side of the monument is reachable because roads are long and seasonal. Snow, heat, wind, smoke, and limited shade shape exposed routes.

Weather Tips for Mount St. Helens

  • Compare valley and high-elevation forecasts because snow, wind, clouds, smoke, and temperature can change sharply with elevation.
  • If thunder is possible, finish exposed viewpoints, ridges, golf, or event grounds early and keep substantial shelter close.
  • Check overnight lows, wet ground, fire rules, drainage, and the nearest substantial shelter before settling into camp.
  • Summer smoke, winter access, shoulder-season closures, and shorter fall daylight can matter even during an otherwise mild forecast.

Nearby Towns and Areas

This page can also be useful when planning outdoor time near:

  • Johnston Ridge area
  • Coldwater Lake
  • Windy Ridge
  • Toutle River
  • Seaquest State Park
  • Cougar
  • Gifford Pinchot National Forest

Plan Around the Conditions

Use the forecast to choose the best version of a Mount St. Helens day. Match wind, precipitation, smoke, water conditions, trail surfaces, road access, temperature, and daylight to the activity that gives your group the safest and most comfortable plan.

7-Day Forecast for Mount St. Helens

🌤
45°F
High: 45° | Low: 32°
Current Temperature
Station: CYFW1
Observed at: 10:52 pm CDT on 9/25/26
Wind: 1 mph | Humidity: 95%
Sat ⛅
41° 35°
0%
Sun ☀
47° 36°
0%
Mon ⛅
46° 38°
1%
Tue 🌧
41° 38°
48%
Wed 🌧
43° 38°
30%
Thu ❄
39° 34°
39%
Fri ⛅
40° --°
9%

7-Day High Temperature Trend

41° Sat 47° Sun 46° Mon 41° Tue 43° Wed 39° Thu 40° Fri

7-Day Low Temperature Trend

35° Sat 36° Sun 38° Mon 38° Tue 38° Wed 34° Thu 50° Fri

📊 7-Day Outdoor Outlook

Good Fair Poor 20 Sat 20 Sun 20 Mon 19 Tue 19 Wed 19 Thu 20 Fri
Forecast data from the National Weather Service  |  Last Updated: September 26, 2026 7:54 pm CDT

Mount St. Helens Weather by Season

Winter

Winter at Mount St. Helens brings mountain snow, ice, short daylight, and changing road or trailhead access. Higher routes may close while lower valleys remain rainy, so check current transportation notices.

Spring

Spring around Mount St. Helens brings changing conditions, rising rivers, wet trails, and lingering mountain snow. Give muddy natural surfaces time to drain and avoid widening trails. Mountain and eastern thunderstorms become increasingly possible later in the season.

Summer

Summer at Mount St. Helens is usually the driest and most dependable season, but wildfire smoke, fire restrictions, heat, and afternoon thunderstorms can interrupt plans. Start exposed routes early and carry enough water. Dry vegetation makes local fire rules especially important.

Fall

Fall at Mount St. Helens brings cooler temperatures, shorter daylight, changing color, and the return of wetter weather west of the Cascades. Early snow or ice may reach upper roads before lower elevations. Check seasonal facility hours and allow extra time on busy event or salmon-viewing weekends.

Key Climate Data Points

  • Annual average temperature: generally around 40–46°F across accessible monument elevations, using the relevant local or regional elevation context.
  • Annual snowfall: snowfall ranges from moderate near lower roads to several hundred inches in high terrain, with substantial year-to-year and elevation variation.
  • Warmest months: July and August are normally warmest.
  • Coolest months: December through February are typically coolest.
  • Wettest season: November through January.
  • Driest season: July and August.
  • Best outdoor window: July through September for the broadest road and trail access.