AgWeatherNet Weekly Weather Outlook for September 24 to September 30, 2016

Summer Returns to Washington Later This Weekend

Nic Loyd, Meteorologist, 509-786-9357

Even though the days are shortening and the autumnal equinox is behind us, the late September weather is trending decidedly in the opposite direction. The diminishing solar radiation will be no match (on the short term) for an atmospheric circulation pattern change. A taste of summer is coming to Washington by early next week thanks to a strong ridge of high pressure that looks to build over the state this weekend. As a result, a relatively benign, dry, and warm outlook period is expected. Initially, cool mornings are likely this weekend, while warming temperatures are expected to impact western areas, especially during the afternoon. As the ridge pushes off to the east and weakens starting around Tuesday, daytime cooling should arrive for western areas, while the east remains rather warm. As is often the case with temperature changes in the Northwest, the cooling is likely to be slightly delayed for eastern areas, especially during the mornings. Thus, daytime highs are not forecast to peak for the eastern region until Monday or Tuesday, while lows may not begin to cool until later in the period. In any event, increasingly unsettled and generally cooler conditions are anticipated later in the week. In fact, the coolest weather of the autumn so far could arrive next weekend, but there is still time for the extended outlook to change.

Temperatures
  • Becoming warmer this weekend.
  • Very warm on Monday.
  • Becoming cooler later next week.

Precipitation
  • Mostly dry through the period.
  • A slight chance of rain later next week, especially in the west.

Wind
  • Generally light winds through Monday.
  • Possibly breezy later next week.

8 to 14 Day Outlook - October 1, 2016 to October 7, 2016
  • Overall, near to below average temperatures and near to above average precipitation are expected during the 8 to 14 day time frame.

Important Points about Next Week's Weather

South Central Washington
  • Normal conditions for this time of the year would be highs in the 70s and lows in the 40s.
Weekend
  • Mostly dry.
  • Highs in the 70s on Saturday, and mid 70s to mid 80s on Sunday.
  • Lows in the 40s on Saturday morning, and 40s to low 50s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the low to mid 80s early, and then becoming cooler.
  • Lows in the mid 40s to low 50s on Monday morning, and then warmer, and cooler later in the week.

North Central Washington
  • Normal conditions for this time of the year would be highs in the upper 60s to mid 70s and lows in the 40s.
Weekend
  • Mostly dry.
  • Highs in the low to mid 70s on Saturday, and mid 70s to low 80s on Sunday.
  • Lows in the 40s on Saturday morning, and 40s to low 50s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the upper 70s to mid 80s early, and then becoming cooler.
  • Lows in the mid 40s to low 50s on Monday morning, and then warmer, and cooler later in the week.

Eastern Washington
  • Normal conditions for this time of the year would be highs in the upper 60s to mid 70s and lows in the low to mid 40s.
Weekend
  • Mostly dry.
  • Highs in the 60s to low 70s on Saturday, and upper 60s to 70s on Sunday.
  • Lows in the low to mid 40s on Saturday morning, and upper 30s to 40s on Sunday morning.
Next Week
  • Mostly dry.
  • Highs in the upper 70s to mid 80s early, and then becoming cooler.
  • Lows in the 40s to low 50s on Monday morning, and then warmer, and cooler later in the week.

Western Washington
  • Normal conditions for this time of the year would be highs in the mid 60s to low 70s and lows in the mid 40s to around 50.
Weekend
  • Mostly dry, with patchy morning fog.
  • Highs in the 60s to low 70s on Saturday, and 70s to low 80s on Sunday.
  • Lows in the mid 40s to low 50s.
Next Week
  • Mostly dry through mid week. Patchy fog is possible.
  • A slight chance of showers at times later in the week.
  • Highs in the 70s to mid 80s on Monday, except cooler the coast, and then cooler region-wide starting on Tuesday.
  • Lows in the mid 40s to mid 50s on Monday morning, and then warmer, and cooler later in the week.
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