When to go · Issaquah
Issaquah, month by month
The best months for Issaquah: May, Jun, Jul, Aug, Sep, Oct. Months to avoid: Jan, Feb, Mar, Apr, Nov, Dec.
Month by month
- JanuaryAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.8 °C (46 °F) / 2 °C (36 °F), 18 rain days46 °F (8 °C) / 36 °F (2 °C), 18 rain daysCrowds: Low
- FebruaryAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.9 °C (48 °F) / 2 °C (36 °F), 15 rain days48 °F (9 °C) / 36 °F (2 °C), 15 rain daysCrowds: Low · 1 festival or holiday
- MarchAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.12 °C (54 °F) / 4 °C (39 °F), 17 rain days54 °F (12 °C) / 39 °F (4 °C), 17 rain daysCrowds: Medium · 2 festivals or holidays
- AprilAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.15 °C (59 °F) / 6 °C (43 °F), 15 rain days59 °F (15 °C) / 43 °F (6 °C), 15 rain daysCrowds: Medium · 1 festival or holiday
- MayGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.19 °C (66 °F) / 9 °C (48 °F), 12 rain days66 °F (19 °C) / 48 °F (9 °C), 12 rain daysCrowds: Medium · 1 festival or holiday
- JuneGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.22 °C (72 °F) / 11 °C (52 °F), 9 rain days72 °F (22 °C) / 52 °F (11 °C), 9 rain daysCrowds: High
- JulyGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.25 °C (77 °F) / 13 °C (55 °F), 6 rain days77 °F (25 °C) / 55 °F (13 °C), 6 rain daysCrowds: High · 1 festival or holiday
- AugustGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.25 °C (77 °F) / 13 °C (55 °F), 6 rain days77 °F (25 °C) / 55 °F (13 °C), 6 rain daysCrowds: High
- SeptemberGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.22 °C (72 °F) / 11 °C (52 °F), 9 rain days72 °F (22 °C) / 52 °F (11 °C), 9 rain daysCrowds: Medium · 1 festival or holiday
- OctoberGreatInside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.16 °C (61 °F) / 8 °C (46 °F), 15 rain days61 °F (16 °C) / 46 °F (8 °C), 15 rain daysCrowds: Medium
- NovemberAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.11 °C (52 °F) / 4 °C (39 °F), 18 rain days52 °F (11 °C) / 39 °F (4 °C), 18 rain daysCrowds: Medium · 1 festival or holiday
- DecemberAvoidListed as a month to avoid: Nov–Apr for low-elevation rain and mud; check trail and pass conditions.8 °C (46 °F) / 2 °C (36 °F), 18 rain days46 °F (8 °C) / 36 °F (2 °C), 18 rain daysCrowds: High · 1 festival or holiday
Compare two months
Weather, crowds and prices for any two months in Issaquah, side by side.
Verdict
May: Great
Jun: Great
Daytime high
May: 19 °C (66 °F)66 °F (19 °C)
Jun: 22 °C (72 °F)72 °F (22 °C)
Night low
May: 9 °C (48 °F)48 °F (9 °C)
Jun: 11 °C (52 °F)52 °F (11 °C)
Rain days
May: 12
Jun: 9 (better)
Crowds
May: Medium
Jun: High
Prices
May: Medium
Jun: High
Festivals listed
May: 1
Jun: 0
May: Inside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.
June: Inside Issaquah's best window: May–Oct for dry trails; late Sep–Oct for salmon runs.
Issaquah: figures are long-term averages from this guide, not a forecast.