Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Mercer Island is from July, August, September. — consistent weather climate
🌥Mild
| Score | 5 | 10 | 27 | 46 | 74 | 81 | 94 | 90 | 82 | 55 | 8 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Cold | Cold | Cold | Cold | Mild | Mild | Pleasant | Pleasant | Mild | Cool & rainy | Cold | Cold |
| Temperature | 3–8°C | 2–8°C | 3–11°C | 5–14°C | 9–18°C | 12–21°C | 14–26°C | 15–26°C | 13–22°C | 9–16°C | 5–10°C | 3–8°C |
| Feels like | -1–6°C | -1–5°C | 0–8°C | 2–12°C | 7–17°C | 10–21°C | 14–26°C | 15–26°C | 12–21°C | 7–15°C | 2–7°C | 0–5°C |
| Precipitation | 223mm 24 days | 116mm 18 days | 97mm 17 days | 76mm 13 days | 69mm 12 days | 67mm 11 days | 12mm 4 days | 32mm 6 days | 63mm 9 days | 109mm 14 days | 187mm 20 days | 193mm 22 days |
| Sunshine | 2.4h ☀︎ 27% | 3.5h ☀︎ 35% | 5.8h ☀︎ 49% | 8.2h ☀︎ 60% | 8.7h ☀︎ 58% | 10.9h ☀︎ 69% | 12.5h ☀︎ 81% | 11.1h ☀︎ 78% | 8.9h ☀︎ 71% | 5.6h ☀︎ 51% | 3.5h ☀︎ 38% | 2.3h ☀︎ 27% |
| Wind | SE · 21 km/h | SE · 20 km/h | S · 18 km/h | S · 19 km/h | SW · 18 km/h | W · 17 km/h | NW · 15 km/h | NW · 17 km/h | NW · 17 km/h | SE · 18 km/h | SE · 20 km/h | SE · 20 km/h |
| Humidity (%) | 85% | 83% | 81% | 77% | 76% | 74% | 68% | 70% | 77% | 84% | 85% | 86% |
| Day length | 8.9h | 10.3h | 11.9h | 13.7h | 15.1h | 15.9h | 15.5h | 14.2h | 12.6h | 10.8h | 9.3h | 8.5h |