Weather forecast for 10 daysStartup, WA

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 59°F
  • 39°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 12%
  • Precipitation: 0"
  • Wind: 4mphNW 309°
  • Humidity: 78%
  • UV index: 2
  • Sunrise: 7:29 am PDT
  • Sunset: 6:14 pm PDT
  • ▼
On Saturday, October 17, overcast conditions are expected early, but the afternoon will bring clear skies and sunshine.
Temperatures will oscillate between a refreshing 59°F at their highest and an icy 39.2°F at their lowest.
The expected high will be a few degrees higher than October's standard temperature of 54.5°F.
Sunrise was at 7:29 am and sunset will be at 6:14 pm; the daylight will last for 10h and 46min.

Sunday Oct 18, 2026

  • 61°F
  • 45°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphNNW 327°
  • Humidity: 72%
  • UV index: 3
  • Sunrise: 7:31 am PDT
  • Sunset: 6:13 pm PDT
  • ▼
On Sunday, in Startup, predominantly sunny weather will make for pleasant outdoor conditions.
The temperature scale will run from a maximum of a comfortable 60.8°F to a minimum of a frosty 44.6°F.
Tomorrow, the temperature forecast of 60.8°F will better match September's climate average than that of October.
Sunrise will be at 7:31 am and sunset at 6:13 pm; tomorrow's daylight will last for 10h and 42min.

10-day overview

Daily temperatures

Warmest day: Wednesday 66°C.
Coldest day: Friday 55°C.

Chance of precipitation

Highest chance: Friday 56%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 59°F
  • 39°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 12%
  • Precipitation: 0"
  • Wind: 4mphNW 309°
  • Humidity: 78%
  • UV index: 2
  • Sunrise: 7:29 am PDT
  • Sunset: 6:14 pm PDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 61°F
  • 45°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 4mphNNW 327°
  • Humidity: 72%
  • UV index: 3
  • Sunrise: 7:31 am PDT
  • Sunset: 6:13 pm PDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 61°F
  • 41°F
Cloudy
Cloudy
  • Precip. probability: 5%
  • Precipitation: 0"
  • Wind: 3mphNW 304°
  • Humidity: 71%
  • UV index: 1
  • Sunrise: 7:32 am PDT
  • Sunset: 6:11 pm PDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 64°F
  • 45°F
Sunny
Sunny
  • Precip. probability: 7%
  • Precipitation: 0"
  • Wind: 4mphNNW 331°
  • Humidity: 73%
  • UV index: 3
  • Sunrise: 7:34 am PDT
  • Sunset: 6:09 pm PDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 66°F
  • 46°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 3%
  • Precipitation: 0"
  • Wind: 3mphNW 314°
  • Humidity: 66%
  • UV index: 2
  • Sunrise: 7:35 am PDT
  • Sunset: 6:07 pm PDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 57°F
  • 45°F
PM Showers
PM Showers
  • Precip. probability: 44%
  • Precipitation: 0.16"
  • Wind: 4mphWNW 282°
  • Humidity: 82%
  • UV index: 2
  • Sunrise: 7:37 am PDT
  • Sunset: 6:05 pm PDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 55°F
  • 43°F
Showers
Showers
  • Precip. probability: 56%
  • Precipitation: 0.24"
  • Wind: 4mphW 277°
  • Humidity: 86%
  • UV index: 2
  • Sunrise: 7:38 am PDT
  • Sunset: 6:03 pm PDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 57°F
  • 43°F
AM Showers
AM Showers
  • Precip. probability: 40%
  • Precipitation: 0.08"
  • Wind: 4mphNNE 28°
  • Humidity: 78%
  • UV index: 2
  • Sunrise: 7:40 am PDT
  • Sunset: 6:02 pm PDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 57°F
  • 45°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 24%
  • Precipitation: 0.08"
  • Wind: 4mphN 9°
  • Humidity: 73%
  • UV index: 2
  • Sunrise: 7:41 am PDT
  • Sunset: 6:00 pm PDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 57°F
  • 43°F
Showers
Showers
  • Precip. probability: 37%
  • Precipitation: 0.35"
  • Wind: 4mphSW 233°
  • Humidity: 77%
  • UV index: 2
  • Sunrise: 7:43 am PDT
  • Sunset: 5:58 pm PDT
  • ▼
wet, gloomy and mostly clear weather is anticipated.
Rainfall is predicted for Thursday through next Monday.
In the coming days, the maximum temperature will range between 55.4°F and 66.2°F, while the forecast minimum temperature falls between 39.2°F and 46.4°F.
Wednesday will be the warmest day, with a maximum temperature of 66.2°F; the lowest daytime temperature of the period will be reached on Friday, peaking at 55.4°F.
Updated: Oct 17, 2026 @ 17:07:06 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Saturday, the morning will be overcast, but sunny conditions will take over by the afternoon.

Today, the highest temperature will be 59°F, while the lowest temperature will be 39.2°F.
Today, the maximum temperature will be moderately higher than the average highest temperature in October. The lowest temperature today will be in line with the average low temperature.

On Saturday, in Startup, sunrise was at 7:29 am and sunset will be at 6:14 pm (PDT).

Today, the daylight will last for 10h and 46min.

On Sunday, dry and sunny weather is expected throughout the day.

Tomorrow, the highest temperature in Startup will be 60.8°F, while the lowest temperature will be 44.6°F.
The maximum temperature will be relatively higher than the average highest temperature of 54.5°F in October. The lowest temperature will be also moderately higher than the average low of 40.1°F.

On Sunday, in Startup, sunrise will be at 7:31 am and sunset at 6:13 pm (PDT).

In Startup, tomorrow, there will be 10h and 42min of daylight.