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When to go · St. Helens, Oregon

St. Helens, Oregon in May

Good month. Outside the best window (Sep–Oct). Across United States: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.

Key facts

Verdict
Good
Temperature
20°C (68°F) / 10°C (50°F)
average high / low
Rain days
6
Crowds
Medium
United States overall
Prices
Medium
United States overall

Verdict

GoodUnited States month rating

Outside the best window (Sep–Oct). Across United States: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.

Is another month better than May?

May is rated good. These months rate higher:

Weather in May

Long-term averages
  • St. Helens, OregonHighs around 20 °C (68 °F), lows around 10 °C (50 °F), rain on about 6 days

Festivals and holidays

Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.

  • Memorial Day big impact

    Last Monday of May · United States

    Start of summer; roads and beaches full.

Crowds and prices

Crowds · United States overall
Medium
Prices · United States overall
Medium

United States overall: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.

Compare two months

Weather, crowds and prices for any two months in St. Helens, Oregon, side by side.

  • Verdict

    May: Good

    Sep: Great (better)

  • Daytime high

    May: 20 °C (68 °F)

    Sep: 23 °C (73 °F)

  • Night low

    May: 10 °C (50 °F)

    Sep: 12 °C (54 °F)

  • Rain days

    May: 6 (better)

    Sep: 7

  • Crowds

    May: Medium

    Sep: Medium

  • Prices

    May: Medium

    Sep: Medium

  • Festivals listed

    May: 1

    Sep: 1

May: Outside the best window (Sep–Oct). Across United States: Warm and green; Memorial Day (last Monday) opens the summer season; timed-entry systems start at some parks.

September: Inside St. Helens, Oregon's best window: Sep–Oct.

St. Helens, Oregon: figures are long-term averages from this guide, not a forecast.

What to pack

  • A warm layer for the evenings

Build the full packing list for your trip →

Across United States in May →