San Diego, CA

California · Records since 1874–2026

🌤️ 78°F Feels like 84°
Currently in San Diego
As of 11:00 AM PDT

Records for September 11

🔥 Record High

102°F

September 11, 1959

+24° from 78° normal

❄ Record Low

56°F

September 11, 1924

-11° from 67° normal
🌞 Normal high: 78°F 🌑 Normal low: 67°F 1991–2020 normals

All-Time Records — San Diego

🔥
111°F
Hottest Day Ever
Sep 26, 1963
❄
25°F
Coldest Day Ever
Jan 7, 1913
🌧
3.34"
Wettest Day Ever
Dec 2, 1854
☃
0.0"
Most Snow in One Day
Jul 29, 2026

First & Last Dates — San Diego

How early and how late each seasonal turning point has ever arrived, across the full period of record

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Range ever recorded Normal date (1991–2020)

Top 10 Record Highs — September 11

# Temp Date
🏆 102°F September 11, 1959
2 100°F September 11, 1878
3 94°F September 11, 1918
4 92°F September 11, 1983
5 91°F September 11, 1898
6 90°F September 11, 1971
7 89°F September 11, 1963
8 87°F September 11, 2015
9 87°F September 11, 1960
10 87°F September 11, 1913

Top 5 Record Lows — September 11

# Temp Date
🥶 56°F September 11, 1924
2 56°F September 11, 1884
3 57°F September 11, 1900
4 57°F September 11, 1894
5 57°F September 11, 1876
About this data — Records are sourced from the NOAA Threadex dataset via RCC ACIS, a quality-controlled record for long-term climate stations. Threadex adjusts for station relocations and observation-time changes, making records comparable across all years since 1874–2026. Climate normals represent the 1991–2020 average.
6
days
🔥 Heat Wave in Progress
6 consecutive days at or above 80°F · since September 5
Heat wave in progress (3+ days ≥ 80°F)

Heat Wave Summary — San Diego

threshold: 80°F (90th percentile of historical Jun–Aug highs)
4.6
Avg heat wave length
days (historical)
88°
Avg peak temp
during heat waves
33
Dangerous nights 2026
Overnights ≥ 70°F
4
Heat waves 2026
so far

Days ≥ 90°F Per Year

1874–2026
4
2026 so far
3
Avg/year 1970–2025
6
Avg/year (last 10 complete)
13
Most in a year (2014)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — San Diego

# Dates Days Peak Avg High Avg Overnight Low
🏆 Aug 23, 1983 – Sep 21, 1983 30 92°F (Sep 10) 84°F 72°F
2 Sep 2, 1984 – Sep 20, 1984 19 100°F (Sep 8) 86°F 75°F
3 Jul 29, 2018 – Aug 14, 2018 17 91°F (Aug 7) 86°F 74°F
4 Jul 18, 1960 – Aug 3, 1960 17 89°F (Jul 23) 83°F 68°F
5 Jul 9, 1981 – Jul 24, 1981 16 85°F (Jul 21) 82°F 71°F
6 Aug 30, 2022 – Sep 13, 2022 15 95°F (Sep 3) 87°F 72°F
7 Aug 25, 1995 – Sep 8, 1995 15 88°F (Sep 2) 83°F 67°F
8 Aug 25, 1952 – Sep 7, 1952 14 90°F (Sep 6) 84°F 66°F
9 Jul 7, 1984 – Jul 20, 1984 14 90°F (Jul 15) 85°F 73°F
10 Sep 10, 1979 – Sep 22, 1979 13 100°F (Sep 15) 88°F 71°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

Nights where the overnight low exceeded the 1991–2020 normal low

74
2026 total
above-normal nights
35.3
Avg / summer
1970–2020
91
Most in a summer
1981

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Annual totals and trend across the full period of record · see this year's standing →

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1850–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1850, annual totals have trended +0.07" per decade, about +1.3" across the record.

Heavy Rain Days Per Year (≥ 1.0")

Compare year-to-year changes in days with heavy rainfall (≥ 1.0")

This Year — 2026

How San Diego is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

166 of 253 days with data were above the 1991–2020 normal high for their date.

Precipitation, Year to Date

5.37"
2026 YTD
Normal: 6.73"
-1.36"
0.00"
September so far
September normal: 0.12"
-0.12"
1
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · San Diego is 1.36" behind the normal pace

Period Review — Aug 11 – Sep 10, 2026

Any window, evaluated against every other year on record — 31 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
76.5°F
Average temperature
3rd-warmest of 152
+4.1°
vs. average
Normal: 72.4°F (1991–2020)
0.00"
Precipitation
1st-driest of 170
-0.02"
vs. average
Normal: 0.02" · 0% of normal

Average Temperature by Year — Aug 11 – Sep 10

1875–2026 · 2026 highlighted · trend +0.41° per decade (warming since 1875)

Precipitation by Year — Aug 11 – Sep 10

1851–2026 · 2026 highlighted

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1984 78.5°F
2 1983 77.5°F
3 2026 76.5°F
4 2022 76.4°F
5 2015 76.3°F
6 1981 75.8°F
7 2020 75.7°F
8 2018 75.6°F
9 2024 74.9°F
10 2012 74.8°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1916 65.3°F
2 1899 65.4°F
3 1900 65.8°F
4 1880 65.8°F
5 1912 65.9°F
6 1914 65.9°F
7 1887 65.9°F
8 1933 66.2°F
9 1895 66.4°F
10 1932 66.4°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1977 2.13"
2 1873 1.95"
3 2023 1.85"
4 1939 1.82"
5 1854 1.35"
6 1976 1.00"
7 1963 0.90"
8 1945 0.87"
9 1951 0.85"
10 2022 0.65"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 2026 0.00"
2 2024 0.00"
3 2020 0.00"
4 2016 0.00"
5 2013 0.00"
6 2012 0.00"
7 2010 0.00"
8 2009 0.00"
9 2008 0.00"
10 2007 0.00"
About this data. Pick any start and end date and this becomes the same kind of review as the Month and Fall tabs, just for exactly the window you asked for — the generalized version of the same engine, evaluated across every year on record. Average temperature is the mean of each day's (high + low) / 2; precipitation is the sum of daily totals. A year missing more than about a fifth of the window's days is excluded from the temperature ranking; any missing day excludes a year from the precipitation ranking, since an unreported day is unreported rain. Ranges that cross from December into January aren't supported yet. Normals are the 1991–2020 mean for the same window.
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