Average annual temperature is 10.6 °C
Absolute maximum temperature: 34.2 °C
Absolute minimum temperature: -7.5 °C
Number of sunny days: 155 days
Number of rainy days: 208 days
Number of snow days: 2 days
Look at detailed online map of City of Issaquah
* Weather data for City of Issaquah United States is based on climate observations for 2026 year
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Absolute maximum temperature (°C) | 12.9 | 12.8 | 18.0 | 28.3 | 31.0 | 29.7 | 31.5 | 34.2 | 27.8 | 28.0 | 15.2 | 14.3 |
| Average daytime temperature (°C) | 8.0 | 7.5 | 11.0 | 12.8 | 21.7 | 22.8 | 26.9 | 27.2 | 21.3 | 16.3 | 10.6 | 9.7 |
| Average temperature (°C) | 4.4 | 3.1 | 5.0 | 7.1 | 14.6 | 15.4 | 19.1 | 19.5 | 14.7 | 10.7 | 6.0 | 6.2 |
| Average night temperature (°C) | 1.6 | 0.0 | 1.0 | 3.1 | 9.0 | 9.6 | 12.2 | 13.5 | 10.3 | 6.8 | 3.1 | 3.7 |
| Absolute minimum temperature (°C) | -5.6 | -7.5 | -6.4 | -1.9 | 3.4 | 6.0 | 9.2 | 9.3 | 3.7 | -3.5 | -3.9 | -2.7 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight maximum duration (h) | 9.0 | 10.0 | 12.0 | 14.0 | 15.0 | 15.0 | 15.0 | 14.0 | 13.0 | 11.0 | 9.0 | 8.0 |
| Daylight mean duration (h) | 8.9 | 10.3 | 11.9 | 13.6 | 15.1 | 15.9 | 15.5 | 14.2 | 12.6 | 10.9 | 9.3 | 8.5 |
| Daylight minimum duration (h) | 8.0 | 9.0 | 11.0 | 12.0 | 14.0 | 15.0 | 15.0 | 13.0 | 11.0 | 10.0 | 8.0 | 8.0 |
| Sunshine mean duration (h) | 3.7 | 4.6 | 7.2 | 6.2 | 10.2 | 11.1 | 12.9 | 11.4 | 7.9 | 6.4 | 5.1 | 3.0 |
| Precipitation (mm) | 129 | 93 | 96 | 169 | 26 | 45 | 13 | 50 | 97 | 101 | 181 | 279 |
| Sunny days | 5 | 9 | 9 | 5 | 18 | 18 | 24 | 18 | 11 | 16 | 14 | 8 |
| Rainy days | 25 | 18 | 22 | 25 | 13 | 12 | 7 | 13 | 19 | 15 | 16 | 23 |
| Snow days | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
The best time to visit City of Issaquah during the most sunny months:
Months with the longest average daylight duration in City of Issaquah:
The largest precipitation sum in City of Issaquah is at