San Jose, CA

California · Records since 1893–2026

☀️ 72°F
Currently in San Jose
As of 11:30 AM PDT

Records for September 11

🔥 Record High

100°F

September 11, 1979

+19° from 81° normal

❄ Record Low

44°F

September 11, 1928

-14° from 58° normal
🌞 Normal high: 81°F 🌑 Normal low: 58°F 1991–2020 normals

All-Time Records — San Jose

🔥
109°F
Hottest Day Ever
Sep 6, 2022
❄
18°F
Coldest Day Ever
Jan 6, 1894
🌧
4.32"
Wettest Day Ever
Sep 12, 1918
☃
1.0"
Most Snow in One Day
Dec 11, 1932

First & Last Dates — San Jose

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)
359 days
Longest growing season
1988
172 days
Shortest growing season
1896

Top 10 Record Highs — September 11

# Temp Date
🏆 100°F September 11, 1979
2 97°F September 11, 2017
3 95°F September 11, 1983
4 95°F September 11, 1924
5 94°F September 11, 1974
6 94°F September 11, 1908
7 93°F September 11, 2003
8 91°F September 11, 2009
9 91°F September 11, 1955
10 90°F September 11, 1988

Top 5 Record Lows — September 11

# Temp Date
🥶 44°F September 11, 1928
2 44°F September 11, 1906
3 44°F September 11, 1896
4 45°F September 11, 1910
5 45°F September 11, 1907
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 1893–2026. Climate normals represent the 1991–2020 average.
3
days
🔥 Heat Wave in Progress
3 consecutive days at or above 90°F · since September 8
Heat wave in progress (3+ days ≥ 90°F)

Heat Wave Summary — San Jose

threshold: 90°F (90th percentile of historical Jun–Aug highs)
3.7
Avg heat wave length
days (historical)
98°
Avg peak temp
during heat waves
0
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1893–2026
8
2026 so far
16
Avg/year 1970–2025
20
Avg/year (last 10 complete)
43
Most in a year (1996)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — San Jose

# Dates Days Peak Avg High Avg Overnight Low
🏆 Sep 30, 2024 – Oct 7, 2024 8 106°F (Oct 2) 100°F 64°F
2 Sep 16, 1939 – Sep 23, 1939 8 101°F (Sep 21) 96°F 63°F
3 Aug 9, 1996 – Aug 16, 1996 8 100°F (Aug 12) 94°F 62°F
4 Jun 15, 1981 – Jun 22, 1981 8 97°F (Jun 19) 95°F 63°F
5 Jul 3, 1905 – Jul 9, 1905 7 108°F (Jul 7) 101°F 59°F
6 Aug 13, 2020 – Aug 19, 2020 7 103°F (Aug 14) 97°F 70°F
7 Jun 23, 1976 – Jun 29, 1976 7 102°F (Jun 27) 99°F 61°F
8 Jun 1, 1996 – Jun 7, 1996 7 100°F (Jun 2) 96°F 59°F
9 Sep 4, 2022 – Sep 9, 2022 6 109°F (Sep 6) 101°F 68°F
10 Jul 20, 2006 – Jul 25, 2006 6 104°F (Jul 23) 98°F 70°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

53
2026 total
above-normal nights
34.7
Avg / summer
1970–2020
78
Most in a summer
2024

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 (1893–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1893, annual totals have trended -0.06" per decade, about -0.8" 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 Jose is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

7.43"
2026 YTD
Normal: 9.27"
-1.84"
0.06"
September so far
September normal: 0.07"
-0.01"
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 Jose is 1.84" behind the normal pace

Period Review — Jun 12 – Sep 10, 2026

Any window, evaluated against every other year on record — 91 days

Quick picks: Last 7 days Last 30 days Last 90 days This month
Seasons: Spring (Mar–May) Summer (Jun–Aug) Fall (Sep–Nov)
69.9°F
Average temperature
23rd-warmest of 128
+0.2°
vs. average
Normal: 69.7°F (1991–2020)
0.06"
Precipitation
36th-wettest of 123
-0.03"
vs. average
Normal: 0.09" · 67% of normal

Average Temperature by Year — Jun 12 – Sep 10

1893–2026 · 2026 highlighted · trend +0.43° per decade (warming since 1893)

Precipitation by Year — Jun 12 – Sep 10

1893–2026 · 2026 highlighted

Warmest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 2024 73.1°F
2 2017 72.5°F
3 1993 71.9°F
4 2022 71.6°F
5 1988 71.5°F
6 1996 71.5°F
7 1997 71.5°F
8 2020 71.4°F
9 1984 71.0°F
10 1961 70.8°F

Coolest Jun 12 – Sep 10 on Record

# Year Avg Temp
1 1893 61.8°F
2 1911 63.2°F
3 1910 63.5°F
4 1909 63.7°F
5 1895 64.0°F
6 1919 64.2°F
7 1912 64.5°F
8 1894 64.5°F
9 1907 64.9°F
10 1928 65.1°F

Wettest Jun 12 – Sep 10 on Record

# Year Total
1 1968 1.96"
2 1912 1.17"
3 1975 0.88"
4 1995 0.85"
5 1980 0.75"
6 1976 0.71"
7 2011 0.61"
8 1935 0.54"
9 1997 0.51"
10 1985 0.47"

Driest Jun 12 – Sep 10 on Record

# Year Total
1 2024 0.00"
2 2023 0.00"
3 2022 0.00"
4 2021 0.00"
5 2019 0.00"
6 2018 0.00"
7 2017 0.00"
8 2016 0.00"
9 2010 0.00"
10 2008 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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