 |
 Current Mercer Island Weather Conditions |
Updated September 18th at 4:53 pm |
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| Temperature: | 72°F |
Dew Point: | 54°F |
| Barometer: | 30.01 inHg |
Wind: | N 19 Mph |
| Humidity: | 53.0% |
Visibility: | 0M |
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| Mercer Island Weather Forecast Summary |
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Today
Sep 18th
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Friday
Sep 19th
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Saturday
Sep 20th
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Sunday
Sep 21st
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Monday
Sep 22nd
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Cloudy |
Mostly Sunny |
Showers |
Showers |
Sunny |
71°F
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76°F
48°F |
74°F
50°F |
66°F
48°F |
73°F
47°F |
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| Mercer Island Detailed Weather Forecast |
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| Thursday, September 18th, 2025 |
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Evening |
Temperature: 49°F |
| Clear. |
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| Friday, September 19th, 2025 |
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Overnight |
Temperature: 50°F |
| Clear. |
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Morning |
Temperature: 71°F |
| Sunny. |
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Afternoon |
Temperature: 67°F |
| Sunny. |
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Evening |
Temperature: 52°F |
| Clear with cloudy periods. |
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| Saturday, September 20th, 2025 |
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Overnight |
Temperature: 52°F |
| Clear. |
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Morning |
Temperature: 71°F |
| Cloudy. |
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Afternoon |
Temperature: 69°F |
| Cloudy. Windy at times. |
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Evening |
Temperature: 56°F |
| Cloudy with a few showers. |
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| Sunday, September 21st, 2025 |
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Overnight |
Temperature: 53°F |
| Cloudy with showers likely. |
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Morning |
Temperature: 58°F |
| Cloudy with showers likely. Slight chance of a thunderstorm. |
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Afternoon |
Temperature: 62°F |
| Cloudy with a chance of showers. |
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Evening |
Temperature: 50°F |
| Mostly clear. |
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| Monday, September 22nd, 2025 |
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Overnight |
Temperature: 48°F |
| Clear. |
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Morning |
Temperature: 68°F |
| Sunny. |
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Afternoon |
Temperature: 65°F |
| Sunny. |
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Evening |
Temperature: 53°F |
| Clear. |
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| Tuesday, September 23rd, 2025 |
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Overnight |
Temperature: 52°F |
| Clear. |
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Morning |
Temperature: 72°F |
| Sunny. |
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Afternoon |
Temperature: 64°F |
| A mix of cloud and sun. |
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Evening |
Temperature: 49°F |
| Clear. |
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| Wednesday, September 24th, 2025 |
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Overnight |
Temperature: 49°F |
| Cloudy. |
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Morning |
Temperature: 68°F |
| A mix of cloud and sun. |
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Afternoon |
Temperature: 64°F |
| Cloudy. |
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Evening |
Temperature: 49°F |
| Clear. |
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| Thursday, September 25th, 2025 |
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Overnight |
Temperature: 48°F |
| Cloudy. |
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Morning |
Temperature: 56°F |
| Cloudy. |
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Afternoon |
Temperature: 57°F |
| Cloudy. |
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Evening |
Temperature: 46°F |
| Mostly clear. |
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| Friday, September 26th, 2025 |
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Overnight |
Temperature: 48°F |
| Cloudy with a chance of showers. |
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Morning |
Temperature: 49°F |
| Cloudy with showers likely. |
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Afternoon |
Temperature: 50°F |
| Sunny with cloudy periods with showers likely. |
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Evening |
Temperature: 44°F |
| Clear with a slight chance of showers. |
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