When to go · Sumas
Sumas in May
Great month. Inside Sumas's best window: May–Sep.
Key facts
- Verdict
- Great
- Temperature
- 18°C (64°F)64°F (18°C) / 8°C (46°F)46°F (8°C)
- average high / low
- Rain days
- 13
- Crowds
- Medium
- United States overall
- Prices
- Medium
- United States overall
Verdict
Inside Sumas's best window: May–Sep.
Is another month better than May?
No other month rates higher than May for Sumas in this guide.
Weather in May
- SumasHighs around 18 °C (64 °F), lows around 8 °C (46 °F), rain on about 13 daysHighs around 64 °F (18 °C), lows around 46 °F (8 °C), rain on about 13 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 Sumas, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 18 °C (64 °F)64 °F (18 °C)
Jun: 21 °C (70 °F)70 °F (21 °C)
Night low
May: 8 °C (46 °F)46 °F (8 °C)
Jun: 11 °C (52 °F)52 °F (11 °C)
Rain days
May: 13
Jun: 11 (better)
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside Sumas's best window: May–Sep.
June: Inside Sumas's best window: May–Sep.
Sumas: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings
- A rain jacket or umbrella and shoes that dry fast