The current outlook is hot on Saturday, hotter on Sunday, and Monday will be the hottest day of all. These are record-breaking temperatures. See the outlook from the National Weather Service (NWS) below.
Changes since last NWS briefing:
- Looking at potentially hotter conditions on Monday by a few degrees (high of 105-107)
- Potentially 5-10 degrees hotter in the morning hours of Monday as compared to Saturday and Sunday
Highlights:
- The entire Seattle metro area is under an Excessive Heat Warning.
- Warm overnight temperatures will mean that people will get very little relief from the heat. Warmest overnight period will likely be Monday night into Tuesday morning.
- Monitoring for potential widespread red flag conditions in Cascades Sunday through next week
- Cooling trend begins on Tuesday, but uncertain about how much cooling and temps will remain above normal through the week (mid-upper 80s)
Seattle Temp Update
- Today (Saturday): High temp = 95 (possible range = 89-102). Heat risk is HIGH for most of Seattle.
- Sunday: High temp = 101 (possible range = 93-108). Heat risk is HIGH for most of Seattle with some isolated pockets of VERY HIGH risk. Low temps Sun Night/Mon Morn = 69 (possible range 62-74)
- Monday: High temp = 105 (possibly 107) (possible range = 99-115). Heat risk is HIGH for most of Seattle with some isolated pockets of VERY HIGH risk mainly in eastern parts of the City. Low temps Mon Night/Tue Morn = 73 (possible range 65-79)
- Tuesday: High temp = 89 (possible range = 82-101). Heat risk is MODERATE for most of Seattle with some isolated pockets of HIGH risk.
Overall Expected Impacts
- Very high risk of heat related illnesses
- Heat sensitive infrastructure (rail lines, metal draw bridges, etc)
- Increased water related accident (cold water shock)
- Significant snow and glacier melt into next week
