Unprecedented Northwest Heat Continues – National Weather Outlook For June 28, 2021

National Weather Forecast

A stalled-out boundary on Monday from the southern Plains to the Ohio River Valley will continue to produce showers and thunderstorms, some of which could be heavy at times. The other big story Monday will be the continuing heatwave across the Northwestern United States.

From Sunday through Tuesday, the heaviest rain will fall across portions of the Southern Plains, where an additional 3-5” of rain could fall in some locations leading to flash flooding.

The scorching hot weather is on across the Northwestern United States this weekend. Portland, OR, on Saturday saw their warmest high in recorded history with a high of 108F. Meanwhile, the high of 102F in Seattle was their second warmest on record.

And the heat will at least continue through Monday across the region, with a reprieve for areas like Seattle and Portland as we head toward Tuesday and Wednesday. Below are the all-time June and all-time record highs for cities across the Northwest that were in place BEFORE this heatwave began. Therefore, they don’t account for new records in these categories that were set Saturday or Sunday.

ALL-TIME RECORD HIGHS:

• Seattle, WA: 103F (July 29, 2009)
• Portland, OR: 107F (set three times, most recently August 10, 1981)
• Spokane, WA: 108F (set two times, most recently August 4, 1961)
• Medford, OR: 115F (July 20, 1946)
• Redding, CA: 118F (set three times, most recently July 20, 1988)
• Boise, ID: 111F (set two times, most recently July 19, 1960)
• Missoula, MT: 107F (July 6, 2007)

JUNE RECORD HIGHS:

• Seattle, WA: 96F (set three times, most recently June 25, 2017)
• Portland, OR: 102F (June 26, 2006)
• Spokane, WA: 105F (June 28, 2015)
• Medford, OR: 111F (June 22, 1992)
• Redding, CA: 117F (June 25, 2006)
• Boise, ID: 110F (June 28, 2015)
• Missoula, MT: 102F (June 28, 2015)

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– D.J. Kayser