What is the hottest day ever recorded in Seattle?

Seattle's hottest day on record reached 105°F, set on July 29, 2009. That is the single most extreme high in the nearest long-term weather station's full daily record — about 43°F hotter than a typical year's average high of 62°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.

What is the record high temperature in Seattle?

The all-time record high in Seattle is 105°F, recorded on July 29, 2009. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.

What is the coldest day ever recorded in Seattle?

Seattle's coldest day on record bottomed out at 3°F, set on January 31, 1950. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.

What is the record low temperature in Seattle?

The all-time record low in Seattle is 3°F, recorded on January 31, 1950. The gap between that and the 105°F record high — a span of 102°F — is the full range of temperatures Seattle has experienced across its long-term daily record.

Is it normal to be this hot in Seattle?

It depends on how far above Seattle's normal a given day runs. A typical year here averages a daily high near 62°F; the all-time record of 105°F (set 2009) sits about 43°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.

When did Seattle set its temperature records?

Seattle's record high of 105°F was set in 2009 (July 29, 2009), and its record low of 3°F in 1950 (January 31, 1950). Both are pulled from the station's full daily record going back to 1948, so they reflect the true extremes rather than a recent or partial sample.

Has Seattle been getting hotter?

There isn't enough station data to say: the latest stretch of complete years with no gap over 10 years is 1999–2025, only 26 years (a trend needs at least 30). The all-time records above still use every valid day in the record.

Seattle, Washington Weather Records

The hottest and coldest days Seattle has ever recorded — and how today compares to normal

Seattle’s all-time temperature records

Hottest day on record: 105°Fset July 29, 2009
Coldest day on record: 3°Fset January 31, 1950

That is a 102°F span between the hottest and coldest days Seattle has ever recorded — the full range of what its weather has done across the station’s record back to 1948.

Seattle, WA · Today vs. normal

4°F below typical for 4:00 AM on Sep 21

At 4:00 AM PDT on Sep 21 it was 49°F in Seattle — 4° below the 53°F typical for that hour (estimated from the Sep 21 normal high of 70°F and low of 52°F, interpolated from the monthly normals).

How extreme Seattle’s weather gets

Seattle’s weather is usually mild by its own standards — a typical year averages a daily high near 62°F, and the normal high for September runs about 72°F. The records sit well outside that everyday range. The hottest day on record reached 105°F in 2009 — roughly 43°F above a typical year’s average high, the kind of gap that turns an ordinary summer into a genuine heat event.

At the other end, Seattle has bottomed out at 3°F (1950). Those edges are why the today-versus-normal readout above is worth a glance: it shows where today falls between the normal and the record, so a hot afternoon can be judged against the real history rather than a hunch. A reading a few degrees over the September normal is ordinary; one pushing toward the 105°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in Seattle?: Seattle's hottest day on record reached 105°F, set on July 29, 2009. That is the single most extreme high in the nearest long-term weather station's full daily record — about 43°F hotter than a typical year's average high of 62°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.
What is the record high temperature in Seattle?: The all-time record high in Seattle is 105°F, recorded on July 29, 2009. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.
What is the coldest day ever recorded in Seattle?: Seattle's coldest day on record bottomed out at 3°F, set on January 31, 1950. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.
What is the record low temperature in Seattle?: The all-time record low in Seattle is 3°F, recorded on January 31, 1950. The gap between that and the 105°F record high — a span of 102°F — is the full range of temperatures Seattle has experienced across its long-term daily record.
Is it normal to be this hot in Seattle?: It depends on how far above Seattle's normal a given day runs. A typical year here averages a daily high near 62°F; the all-time record of 105°F (set 2009) sits about 43°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.
When did Seattle set its temperature records?: Seattle's record high of 105°F was set in 2009 (July 29, 2009), and its record low of 3°F in 1950 (January 31, 1950). Both are pulled from the station's full daily record going back to 1948, so they reflect the true extremes rather than a recent or partial sample.
Has Seattle been getting hotter?: There isn't enough station data to say: the latest stretch of complete years with no gap over 10 years is 1999–2025, only 26 years (a trend needs at least 30). The all-time records above still use every valid day in the record.