Best Time to Visit Issaquah: Month-by-Month Guide
Best months for Issaquah: August, July, September.
- Best months for Issaquah: August, July, September.
- Peak season is August, July, September. Expect higher prices and more visitors (estimated from the climate, not from visitor counts).
- Shoulder season: June. Good weather without the busiest period.
- Wettest months: November, March, January.
- The least pleasant month is December (score 3.6).
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 8°C | 2°C | 213 mm | 19 | – | – | 3.7 |
| February | 9°C | 2°C | 149 mm | 15 | – | – | 4.7 |
| March | 12°C | 3°C | 166 mm | 19 | – | – | 4.6 |
| April | 15°C | 5°C | 137 mm | 17 | – | – | 5.4 |
| May | 18°C | 8°C | 98 mm | 14 | – | – | 6.6 |
| June | 21°C | 10°C | 81 mm | 12 | – | – | 7.3 |
| July | 24°C | 12°C | 34 mm | 7 | – | – | 8.2 |
| August | 25°C | 12°C | 41 mm | 6 | – | – | 8.3 |
| September | 21°C | 10°C | 85 mm | 9 | – | – | 7.8 |
| October | 15°C | 7°C | 168 mm | 15 | – | – | 5.5 |
| November | 10°C | 4°C | 227 mm | 19 | – | – | 4.2 |
| December | 7°C | 2°C | 206 mm | 18 | – | – | 3.6 |
Frequently asked questions
When is the best time to visit Issaquah?
The best months are August, July, September.
When is the rainy season in Issaquah?
The wettest months are November, March, January.