Mercer Island Weather Forecast 15 Days, Weather in Mercer Island Today
Current weather conditions and 15 day weather forecast for Mercer Island, Washington, USA including weather daily high/low temperature, warnings, chance of precipitation, pressure, humidity/wind chill, rain risk, wind speed, cloud, pressure, and UV index.
Current weather conditions at Mercer Island
| 28 July 2025 Monday 23.2 ° C / 73.8°F  Sunny |
Feels Like : 24.8 ° C / 76.7°F Humidity : % 47 Pressure : 1020 mb Wind Speed : 3.6 kmph / 2.2 miles from W  Visibility : 16 km Precipitation (rainfall) : 0 mm Cloud (%) : 0 |
15 day weather forecast for Mercer Island, WA, USA
Weather Forecast for next 15 Days for Mercer Island including weather warnings, temperature, rain, wind speed, cloud, snow, wind speed and wind direction, pressure and UV index.Here is weather for the next 15 days in Mercer Island, Washington state, US. To see the daily forecast, scroll to the table below.
| Date | |
|---|---|
| 28 July 2025 Monday | |
| Weather forecast | Sunny |
| Low temperature | 13.3 ° C (55.9°F) |
| High temperature | 29 ° C (84.2°F) |
| Avg. temperature | 20.1 ° C (68.2°F) |
| Humidity | % 65 |
| Chance of rain | 0% |
| UV Index | 2 |
| Sun Position | Sunrise:05:42 AM Sunset: 08:48 PM |
| Moon Position | Moonrise:10:09 AM Moonset: 10:34 PM Moon Phase ( Waxing Crescent ) |
| 29 July 2025 Tuesday | |
| Weather forecast | Sunny |
| Low temperature | 13.1 ° C (55.6°F) |
| High temperature | 29.1 ° C (84.4°F) |
| Avg. temperature | 20.1 ° C (68.2°F) |
| Humidity | % 64 |
| Chance of rain | 0% |
| UV Index | 2.1 |
| Sun Position | Sunrise:05:43 AM Sunset: 08:47 PM |
| Moon Position | Moonrise:11:17 AM Moonset: 10:47 PM Moon Phase ( Waxing Crescent ) |
| 30 July 2025 Wednesday | |
| Weather forecast |  Partly Cloudy |
| Low temperature | 13.3 ° C (55.9°F) |
| High temperature | 28.5 ° C (83.3°F) |
| Avg. temperature | 19.8 ° C (67.6°F) |
| Humidity | % 72 |
| Chance of rain | 0% |
| UV Index | 2.1 |
| Sun Position | Sunrise:05:45 AM Sunset: 08:45 PM |
| Moon Position | Moonrise:12:25 PM Moonset: 11:02 PM Moon Phase ( Waxing Crescent ) |
| 31 July 2025 Thursday | |
| Weather forecast | Partly Cloudy |
| Low temperature | 14.7 ° C (58.5°F) |
| High temperature | 29.1 ° C (84.5°F) |
| Avg. temperature | 19.8 ° C (67.7°F) |
| Humidity | % 68 |
| Chance of rain | 0% |
| UV Index | 2 |
| Sun Position | Sunrise:05:46 AM Sunset: 08:44 PM |
| Moon Position | Moonrise:01:33 PM Moonset: 11:19 PM Moon Phase ( Waxing Crescent ) |
| 01 August 2025 Friday | |
| Weather forecast |  Overcast |
| Low temperature | 13.4 ° C (56.1°F) |
| High temperature | 27.8 ° C (82°F) |
| Avg. temperature | 19 ° C (66.2°F) |
| Humidity | % 65 |
| Chance of rain | 0% |
| UV Index | 0 |
| Sun Position | Sunrise:05:47 AM Sunset: 08:42 PM |
| Moon Position | Moonrise:02:41 PM Moonset: 11:39 PM Moon Phase ( First Quarter ) |
| 02 August 2025 Saturday | |
| Weather forecast | Sunny |
| Low temperature | 10.8 ° C (51.5°F) |
| High temperature | 27.6 ° C (81.7°F) |
| Avg. temperature | 18.4 ° C (65.2°F) |
| Humidity | % 59 |
| Chance of rain | 0% |
| UV Index | 5 |
| Sun Position | Sunrise:05:48 AM Sunset: 08:41 PM |
| Moon Position | Moonrise:03:51 PM Moonset: No moonset Moon Phase ( Waxing Gibbous ) |
| 03 August 2025 Sunday | |
| Weather forecast | Sunny |
| Low temperature | 10.1 ° C (50.1°F) |
| High temperature | 26.9 ° C (80.5°F) |
| Avg. temperature | 18.2 ° C (64.8°F) |
| Humidity | % 57 |
| Chance of rain | 0% |
| UV Index | 5 |
| Sun Position | Sunrise:05:50 AM Sunset: 08:39 PM |
| Moon Position | Moonrise:04:59 PM Moonset: 12:05 AM Moon Phase ( Waxing Gibbous ) |
| 04 August 2025 Monday | |
| Weather forecast | Sunny |
| Low temperature | 10.3 ° C (50.6°F) |
| High temperature | 27.3 ° C (81.2°F) |
| Avg. temperature | 18.5 ° C (65.3°F) |
| Humidity | % 57 |
| Chance of rain | 0% |
| UV Index | 5 |
| Sun Position | Sunrise:05:51 AM Sunset: 08:38 PM |
| Moon Position | Moonrise:06:02 PM Moonset: 12:39 AM Moon Phase ( Waxing Gibbous ) |
| 05 August 2025 Tuesday | |
| Weather forecast | Sunny |
| Low temperature | 11.8 ° C (53.3°F) |
| High temperature | 28.4 ° C (83°F) |
| Avg. temperature | 19.8 ° C (67.7°F) |
| Humidity | % 56 |
| Chance of rain | 0% |
| UV Index | 5 |
| Sun Position | Sunrise:05:52 AM Sunset: 08:36 PM |
| Moon Position | Moonrise:06:56 PM Moonset: 01:25 AM Moon Phase ( Waxing Gibbous ) |
| 06 August 2025 Wednesday | |
| Weather forecast | Sunny |
| Low temperature | 13.5 ° C (56.2°F) |
| High temperature | 28.2 ° C (82.8°F) |
| Avg. temperature | 20.7 ° C (69.2°F) |
| Humidity | % 64 |
| Chance of rain | 0% |
| UV Index | 6 |
| Sun Position | Sunrise:05:53 AM Sunset: 08:35 PM |
| Moon Position | Moonrise:07:40 PM Moonset: 02:23 AM Moon Phase ( Waxing Gibbous ) |
| 07 August 2025 Thursday | |
| Weather forecast | Partly Cloudy |
| Low temperature | 14.4 ° C (57.8°F) |
| High temperature | 29 ° C (84.3°F) |
| Avg. temperature | 20.9 ° C (69.6°F) |
| Humidity | % 68 |
| Chance of rain | 0% |
| UV Index | 6 |
| Sun Position | Sunrise:05:55 AM Sunset: 08:33 PM |
| Moon Position | Moonrise:08:14 PM Moonset: 03:32 AM Moon Phase ( Waxing Gibbous ) |
| 08 August 2025 Friday | |
| Weather forecast | Partly Cloudy |
| Low temperature | 13.8 ° C (56.8°F) |
| High temperature | 25.7 ° C (78.3°F) |
| Avg. temperature | 19.2 ° C (66.6°F) |
| Humidity | % 65 |
| Chance of rain | 0% |
| UV Index | 5 |
| Sun Position | Sunrise:05:56 AM Sunset: 08:32 PM |
| Moon Position | Moonrise:08:40 PM Moonset: 04:48 AM Moon Phase ( Waxing Gibbous ) |
| 09 August 2025 Saturday | |
| Weather forecast | Sunny |
| Low temperature | 12.5 ° C (54.5°F) |
| High temperature | 29.6 ° C (85.3°F) |
| Avg. temperature | 20.9 ° C (69.6°F) |
| Humidity | % 56 |
| Chance of rain | 0% |
| UV Index | 6 |
| Sun Position | Sunrise:05:57 AM Sunset: 08:30 PM |
| Moon Position | Moonrise:09:01 PM Moonset: 06:08 AM Moon Phase ( Full Moon ) |
| 10 August 2025 Sunday | |
| Weather forecast | Sunny |
| Low temperature | 16 ° C (60.8°F) |
| High temperature | 33.3 ° C (91.9°F) |
| Avg. temperature | 24.3 ° C (75.8°F) |
| Humidity | % 38 |
| Chance of rain | 0% |
| UV Index | 6 |
| Sun Position | Sunrise:05:59 AM Sunset: 08:29 PM |
| Moon Position | Moonrise:09:19 PM Moonset: 07:28 AM Moon Phase ( Waning Gibbous ) |
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 28 July 2025 Monday | Sunny |
13.3 ° C (55.9°F) |
29 ° C (84.2°F) |
20.1 ° C (68.2°F) |
% 65 | 0% | 2 | Sunrise:05:42 AM Sunset: 08:48 PM |
Moonrise:10:09 AM Moonset: 10:34 PM Moon Phase ( Waxing Crescent ) |
|
| 29 July 2025 Tuesday | Sunny |
13.1 ° C (55.6°F) |
29.1 ° C (84.4°F) |
20.1 ° C (68.2°F) |
% 64 | 0% | 2.1 | Sunrise:05:43 AM Sunset: 08:47 PM |
Moonrise:11:17 AM Moonset: 10:47 PM Moon Phase ( Waxing Crescent ) |
|
| 30 July 2025 Wednesday | Partly Cloudy |
13.3 ° C (55.9°F) |
28.5 ° C (83.3°F) |
19.8 ° C (67.6°F) |
% 72 | 0% | 2.1 | Sunrise:05:45 AM Sunset: 08:45 PM |
Moonrise:12:25 PM Moonset: 11:02 PM Moon Phase ( Waxing Crescent ) |
|
| 31 July 2025 Thursday | Partly Cloudy |
14.7 ° C (58.5°F) |
29.1 ° C (84.5°F) |
19.8 ° C (67.7°F) |
% 68 | 0% | 2 | Sunrise:05:46 AM Sunset: 08:44 PM |
Moonrise:01:33 PM Moonset: 11:19 PM Moon Phase ( Waxing Crescent ) |
|
| 01 August 2025 Friday | Overcast |
13.4 ° C (56.1°F) |
27.8 ° C (82°F) |
19 ° C (66.2°F) |
% 65 | 0% | 0 | Sunrise:05:47 AM Sunset: 08:42 PM |
Moonrise:02:41 PM Moonset: 11:39 PM Moon Phase ( First Quarter ) |
|
| 02 August 2025 Saturday | Sunny |
10.8 ° C (51.5°F) |
27.6 ° C (81.7°F) |
18.4 ° C (65.2°F) |
% 59 | 0% | 5 | Sunrise:05:48 AM Sunset: 08:41 PM |
Moonrise:03:51 PM Moonset: No moonset Moon Phase ( Waxing Gibbous ) |
|
| 03 August 2025 Sunday | Sunny |
10.1 ° C (50.1°F) |
26.9 ° C (80.5°F) |
18.2 ° C (64.8°F) |
% 57 | 0% | 5 | Sunrise:05:50 AM Sunset: 08:39 PM |
Moonrise:04:59 PM Moonset: 12:05 AM Moon Phase ( Waxing Gibbous ) |
|
| 04 August 2025 Monday | Sunny |
10.3 ° C (50.6°F) |
27.3 ° C (81.2°F) |
18.5 ° C (65.3°F) |
% 57 | 0% | 5 | Sunrise:05:51 AM Sunset: 08:38 PM |
Moonrise:06:02 PM Moonset: 12:39 AM Moon Phase ( Waxing Gibbous ) |
|
| 05 August 2025 Tuesday | Sunny |
11.8 ° C (53.3°F) |
28.4 ° C (83°F) |
19.8 ° C (67.7°F) |
% 56 | 0% | 5 | Sunrise:05:52 AM Sunset: 08:36 PM |
Moonrise:06:56 PM Moonset: 01:25 AM Moon Phase ( Waxing Gibbous ) |
|
| 06 August 2025 Wednesday | Sunny |
13.5 ° C (56.2°F) |
28.2 ° C (82.8°F) |
20.7 ° C (69.2°F) |
% 64 | 0% | 6 | Sunrise:05:53 AM Sunset: 08:35 PM |
Moonrise:07:40 PM Moonset: 02:23 AM Moon Phase ( Waxing Gibbous ) |
|
| 07 August 2025 Thursday | Partly Cloudy |
14.4 ° C (57.8°F) |
29 ° C (84.3°F) |
20.9 ° C (69.6°F) |
% 68 | 0% | 6 | Sunrise:05:55 AM Sunset: 08:33 PM |
Moonrise:08:14 PM Moonset: 03:32 AM Moon Phase ( Waxing Gibbous ) |
|
| 08 August 2025 Friday | Partly Cloudy |
13.8 ° C (56.8°F) |
25.7 ° C (78.3°F) |
19.2 ° C (66.6°F) |
% 65 | 0% | 5 | Sunrise:05:56 AM Sunset: 08:32 PM |
Moonrise:08:40 PM Moonset: 04:48 AM Moon Phase ( Waxing Gibbous ) |
|
| 09 August 2025 Saturday | Sunny |
12.5 ° C (54.5°F) |
29.6 ° C (85.3°F) |
20.9 ° C (69.6°F) |
% 56 | 0% | 6 | Sunrise:05:57 AM Sunset: 08:30 PM |
Moonrise:09:01 PM Moonset: 06:08 AM Moon Phase ( Full Moon ) |
|
| 10 August 2025 Sunday | Sunny |
16 ° C (60.8°F) |
33.3 ° C (91.9°F) |
24.3 ° C (75.8°F) |
% 38 | 0% | 6 | Sunrise:05:59 AM Sunset: 08:29 PM |
Moonrise:09:19 PM Moonset: 07:28 AM Moon Phase ( Waning Gibbous ) |
|
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