Startup Weather Forecast 15 Days, Weather in Startup Today
Current weather conditions and 15 day weather forecast for Startup, 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 Startup
| 13 September 2026 Sunday 17.3 ° C / 63.1°F  Patchy rain nearby |
Feels Like : 16.8 ° C / 62.2°F Humidity : % 61 Pressure : 1010 mb Wind Speed : 3.6 kmph / 2.2 miles from S  Visibility : 10 km Precipitation (rainfall) : 0.1 mm Cloud (%) : 100 |
15 day weather forecast for Startup, WA, USA
Weather Forecast for next 15 Days for Startup 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 Startup, Washington state, US. To see the daily forecast, scroll to the table below.
| Date | Weather forecast | Low temperature | High temperature | Avg. temperature | Humidity | Chance of rain | UV Index | Sun Position | Moon Position | |
|---|---|---|---|---|---|---|---|---|---|---|
| 12 September 2026 Saturday |  Overcast |
11.1 ° C (52°F) |
22 ° C (71.6°F) |
16.3 ° C (61.3°F) |
% 70 | 64% | 3.5 | Sunrise:06:40 AM Sunset: 07:26 PM |
Moonrise:08:34 AM Moonset: 07:45 PM Moon Phase ( New Moon ) |
|
| 13 September 2026 Sunday |  Light rain shower |
9.1 ° C (48.4°F) |
14.1 ° C (57.4°F) |
10.4 ° C (50.8°F) |
% 97 | 94% | 0.6 | Sunrise:06:41 AM Sunset: 07:24 PM |
Moonrise:09:56 AM Moonset: 08:04 PM Moon Phase ( Waxing Crescent ) |
|
| 14 September 2026 Monday | Overcast |
9.6 ° C (49.3°F) |
16.2 ° C (61.2°F) |
11.9 ° C (53.4°F) |
% 80 | 67% | 3.7 | Sunrise:06:42 AM Sunset: 07:22 PM |
Moonrise:11:17 AM Moonset: 08:27 PM Moon Phase ( Waxing Crescent ) |
|
| 15 September 2026 Tuesday |  Sunny |
7.4 ° C (45.3°F) |
19.3 ° C (66.7°F) |
12.5 ° C (54.6°F) |
% 73 | 8% | 4.5 | Sunrise:06:44 AM Sunset: 07:20 PM |
Moonrise:12:35 PM Moonset: 08:56 PM Moon Phase ( Waxing Crescent ) |
|
| 16 September 2026 Wednesday |  Smoky haze |
9.1 ° C (48.4°F) |
23.1 ° C (73.6°F) |
15.3 ° C (59.5°F) |
% 66 | 4% | 5.2 | Sunrise:06:45 AM Sunset: 07:17 PM |
Moonrise:01:49 PM Moonset: 09:33 PM Moon Phase ( First Quarter ) |
|
| 17 September 2026 Thursday | Smoky haze |
12.2 ° C (53.9°F) |
27.1 ° C (80.7°F) |
18.6 ° C (65.5°F) |
% 53 | 2% | 7 | Sunrise:06:47 AM Sunset: 07:15 PM |
Moonrise:02:53 PM Moonset: 10:19 PM Moon Phase ( First Quarter ) |
|
| 18 September 2026 Friday | Sunny |
14.2 ° C (57.5°F) |
27.2 ° C (81°F) |
19.9 ° C (67.7°F) |
% 44 | 2% | 7 | Sunrise:06:48 AM Sunset: 07:13 PM |
Moonrise:03:46 PM Moonset: 11:16 PM Moon Phase ( First Quarter ) |
|
| 19 September 2026 Saturday | Overcast |
10.5 ° C (51°F) |
20.4 ° C (68.7°F) |
15.7 ° C (60.3°F) |
% 66 | 10% | 6 | Sunrise:06:49 AM Sunset: 07:11 PM |
Moonrise:04:28 PM Moonset: Does not set today Moon Phase ( First Quarter ) |
|
| 20 September 2026 Sunday | Patchy rain nearby |
10.1 ° C (50.2°F) |
16.5 ° C (61.6°F) |
12.4 ° C (54.3°F) |
% 79 | 47% | 4 | Sunrise:06:51 AM Sunset: 07:09 PM |
Moonrise:04:59 PM Moonset: 12:19 AM Moon Phase ( Waxing Gibbous ) |
|
| 21 September 2026 Monday | Overcast |
8.8 ° C (47.8°F) |
19 ° C (66.3°F) |
12.8 ° C (55.1°F) |
% 75 | 16% | 4 | Sunrise:06:52 AM Sunset: 07:07 PM |
Moonrise:05:23 PM Moonset: 01:27 AM Moon Phase ( Waxing Gibbous ) |
|
| 22 September 2026 Tuesday | Sunny |
9.2 ° C (48.6°F) |
19.6 ° C (67.4°F) |
13.4 ° C (56°F) |
% 77 | 11% | 5 | Sunrise:06:53 AM Sunset: 07:05 PM |
Moonrise:05:43 PM Moonset: 02:36 AM Moon Phase ( Waxing Gibbous ) |
|
| 23 September 2026 Wednesday | Overcast |
9.7 ° C (49.5°F) |
17.3 ° C (63.1°F) |
12.8 ° C (55°F) |
% 67 | 15% | 4 | Sunrise:06:55 AM Sunset: 07:03 PM |
Moonrise:05:59 PM Moonset: 03:44 AM Moon Phase ( Waxing Gibbous ) |
|
| 24 September 2026 Thursday | Light rain shower |
8.8 ° C (47.9°F) |
13.2 ° C (55.8°F) |
10.3 ° C (50.5°F) |
% 74 | 80% | 3 | Sunrise:06:56 AM Sunset: 07:01 PM |
Moonrise:06:14 PM Moonset: 04:52 AM Moon Phase ( Full Moon ) |
|
| 25 September 2026 Friday |  Mist |
5.9 ° C (42.7°F) |
19.6 ° C (67.3°F) |
12.1 ° C (53.8°F) |
% 72 | 60% | 4 | Sunrise:06:57 AM Sunset: 06:59 PM |
Moonrise:06:28 PM Moonset: 06:00 AM Moon Phase ( Full Moon ) |
|
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