What is the hottest day ever recorded in San Diego?

San Diego's hottest day on record reached 111°F, set on September 26, 1963. That is the single most extreme high in the nearest long-term weather station's full daily record — about 38°F hotter than a typical year's average high of 73°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 San Diego?

The all-time record high in San Diego is 111°F, recorded on September 26, 1963. 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 San Diego?

San Diego's coldest day on record bottomed out at 28°F, set on January 5, 1972. Like the record high, it comes from the station's complete 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 San Diego?

The all-time record low in San Diego is 28°F, recorded on January 5, 1972. The gap between that and the 111°F record high — a span of 83°F — is the full range of temperatures San Diego has experienced across its long-term daily record.

Is it normal to be this hot in San Diego?

It depends on how far above San Diego's normal a given day runs. A typical year here averages a daily high near 73°F; the all-time record of 111°F (set 1963) sits about 38°F above that. The anomaly readout at the top of this page compares the current temperature against this month's normal high, so you can see exactly how unusual today is rather than guessing.

When did San Diego set its temperature records?

San Diego's record high of 111°F was set in 1963 (September 26, 1963), and its record low of 28°F in 1972 (January 5, 1972). Both are pulled from the station's complete daily record going back to 1947, so they reflect the true extremes rather than a recent or partial sample.

Has San Diego been getting hotter?

Yes — San Diego's annual mean temperature has trended about 2.1°F warmer since 1947, in line with the long-term warming seen across nearly every US city. That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.

San Diego, California Weather Records

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

San Diego, CA · Today vs. normal

Right about normal for June

Right now it’s 74°F in San Diego — about right at the June normal high of 75°F.

San Diego’s all-time temperature records

Hottest day on record: 111°Fset September 26, 1963
Coldest day on record: 28°Fset January 5, 1972

That is a 83°F span between the hottest and coldest days San Diego has ever recorded — the full range of what its weather has done across the station’s record back to 1947.

How extreme San Diego’s weather gets

San Diego’s weather is usually mild by its own standards — a typical year averages a daily high near 73°F, and the normal high for June runs about 75°F. The records sit well outside that everyday range. The hottest day on record reached 111°F in 1963 — roughly 38°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, San Diego has bottomed out at 28°F (1972). Together the two extremes span 83°F — the full width of what this place’s weather has done across the station’s daily record back to 1947. Those edges are exactly why the anomaly readout at the top of this page 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 June normal is ordinary; one pushing toward the 111°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in San Diego?: San Diego's hottest day on record reached 111°F, set on September 26, 1963. That is the single most extreme high in the nearest long-term weather station's full daily record — about 38°F hotter than a typical year's average high of 73°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 San Diego?: The all-time record high in San Diego is 111°F, recorded on September 26, 1963. 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 San Diego?: San Diego's coldest day on record bottomed out at 28°F, set on January 5, 1972. Like the record high, it comes from the station's complete 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 San Diego?: The all-time record low in San Diego is 28°F, recorded on January 5, 1972. The gap between that and the 111°F record high — a span of 83°F — is the full range of temperatures San Diego has experienced across its long-term daily record.
Is it normal to be this hot in San Diego?: It depends on how far above San Diego's normal a given day runs. A typical year here averages a daily high near 73°F; the all-time record of 111°F (set 1963) sits about 38°F above that. The anomaly readout at the top of this page compares the current temperature against this month's normal high, so you can see exactly how unusual today is rather than guessing.
When did San Diego set its temperature records?: San Diego's record high of 111°F was set in 1963 (September 26, 1963), and its record low of 28°F in 1972 (January 5, 1972). Both are pulled from the station's complete daily record going back to 1947, so they reflect the true extremes rather than a recent or partial sample.
Has San Diego been getting hotter?: Yes — San Diego's annual mean temperature has trended about 2.1°F warmer since 1947, in line with the long-term warming seen across nearly every US city. That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.

More for San Diego

See the full San Diego, CA weather forecast — hour-by-hour outlook, NOAA radar, satellite, and air quality — or the broader San Diego climate & weather by month for the long-run averages behind these records.