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)68°F (20°C) / 10°C (50°F)50°F (10°C)
- average high / low
- Rain days
- 6
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
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
- St. Helens, OregonHighs around 20 °C (68 °F), lows around 10 °C (50 °F), rain on about 6 daysHighs around 68 °F (20 °C), lows around 50 °F (10 °C), 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)68 °F (20 °C)
Sep: 23 °C (73 °F)73 °F (23 °C)
Night low
May: 10 °C (50 °F)50 °F (10 °C)
Sep: 12 °C (54 °F)54 °F (12 °C)
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