When to go · Sumas
Sumas, month by month
The best months for Sumas: May, Jun, Jul, Aug, Sep. Months to avoid: Jan, Feb, Nov, Dec.
Month by month
- JanuaryAvoidListed as a month to avoid: Nov–Feb (rain, occasional snow and ice on WA-9).7 °C (45 °F) / 1 °C (34 °F), 18 rain days45 °F (7 °C) / 34 °F (1 °C), 18 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Nov–Feb (rain, occasional snow and ice on WA-9).9 °C (48 °F) / 1 °C (34 °F), 15 rain days48 °F (9 °C) / 34 °F (1 °C), 15 rain daysCrowds: Low · 1 festival or holiday
- MarchGoodOutside the best window (May–Sep). Across United States: Spring break fills Florida beaches and parks; the desert parks come into season.11 °C (52 °F) / 3 °C (37 °F), 17 rain days52 °F (11 °C) / 37 °F (3 °C), 17 rain daysCrowds: Medium · 2 festivals or holidays
- AprilGoodOutside the best window (May–Sep). Across United States: Good month for the Southwest, Washington cherry blossoms, the South; mountain roads still closed.14 °C (57 °F) / 5 °C (41 °F), 15 rain days57 °F (14 °C) / 41 °F (5 °C), 15 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Sumas's best window: May–Sep.18 °C (64 °F) / 8 °C (46 °F), 13 rain days64 °F (18 °C) / 46 °F (8 °C), 13 rain daysCrowds: Medium · 1 festival or holiday
- JuneGreatInside Sumas's best window: May–Sep.21 °C (70 °F) / 11 °C (52 °F), 11 rain days70 °F (21 °C) / 52 °F (11 °C), 11 rain daysCrowds: High
- JulyGreatInside Sumas's best window: May–Sep.24 °C (75 °F) / 13 °C (55 °F), 7 rain days75 °F (24 °C) / 55 °F (13 °C), 7 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Sumas's best window: May–Sep.24 °C (75 °F) / 13 °C (55 °F), 7 rain days75 °F (24 °C) / 55 °F (13 °C), 7 rain daysCrowds: High
- SeptemberGreatInside Sumas's best window: May–Sep.21 °C (70 °F) / 10 °C (50 °F), 10 rain days70 °F (21 °C) / 50 °F (10 °C), 10 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGoodOutside the best window (May–Sep). Across United States: Best all-round month: New England foliage, desert parks, cooler cities. High roads start closing late in the month.15 °C (59 °F) / 7 °C (45 °F), 16 rain days59 °F (15 °C) / 45 °F (7 °C), 16 rain daysCrowds: Medium
- NovemberAvoidListed as a month to avoid: Nov–Feb (rain, occasional snow and ice on WA-9).10 °C (50 °F) / 4 °C (39 °F), 19 rain days50 °F (10 °C) / 39 °F (4 °C), 19 rain daysCrowds: Medium · 1 festival or holiday
- DecemberAvoidListed as a month to avoid: Nov–Feb (rain, occasional snow and ice on WA-9).7 °C (45 °F) / 1 °C (34 °F), 19 rain days45 °F (7 °C) / 34 °F (1 °C), 19 rain daysCrowds: High · 1 festival or holiday
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.