San Antonio, TX

Texas · Records since 1885–2026

☀️ 98°F Feels like 108°
Currently in San Antonio
As of 1:30 PM CDT
🔥 5° below today's record of 103°F

Records for September 11

🔥 Record High

103°F

September 11, 1893

+12° from 91° normal

❄ Record Low

56°F

September 11, 1968

-15° from 71° normal
🌞 Normal high: 91°F 🌑 Normal low: 71°F 1991–2020 normals

All-Time Records — San Antonio

🔥
111°F
Hottest Day Ever
Sep 5, 2000
❄
0°F
Coldest Day Ever
Jan 31, 1949
🌧
11.26"
Wettest Day Ever
Oct 17, 1998
☃
13.2"
Most Snow in One Day
Jan 12, 1985

First & Last Dates — San Antonio

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)
350 days
Longest growing season
1928
221 days
Shortest growing season
1987
276 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 103°F September 11, 1893
2 100°F September 11, 2000
3 100°F September 11, 1937
4 100°F September 11, 1930
5 100°F September 11, 1912
6 99°F September 11, 2014
7 99°F September 11, 2011
8 99°F September 11, 1965
9 99°F September 11, 1945
10 98°F September 11, 1982

Top 5 Record Lows — September 11

# Temp Date
🥶 56°F September 11, 1968
2 58°F September 11, 1907
3 59°F September 11, 2017
4 60°F September 11, 1944
5 62°F September 11, 1996
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 1885–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — San Antonio

threshold: 100°F (90th percentile of historical Jun–Aug highs)
5.2
Avg heat wave length
days (historical)
103°
Avg peak temp
during heat waves
127
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1885–2026
105
2026 so far
114
Avg/year 1970–2025
133
Avg/year (last 10 complete)
162
Most in a year (2025)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — San Antonio

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 30, 2023 – Aug 21, 2023 23 106°F (Aug 9) 104°F 79°F
2 Jul 24, 1962 – Aug 13, 1962 21 106°F (Aug 13) 102°F 76°F
3 Aug 24, 2023 – Sep 10, 2023 18 105°F (Aug 27) 102°F 77°F
4 Jul 8, 2023 – Jul 22, 2023 15 106°F (Jul 13) 103°F 78°F
5 Jul 28, 2013 – Aug 11, 2013 15 105°F (Aug 6) 103°F 78°F
6 Jul 1, 2022 – Jul 14, 2022 14 107°F (Jul 11) 102°F 79°F
7 Aug 11, 2024 – Aug 23, 2024 13 108°F (Aug 21) 102°F 80°F
8 Jul 16, 1994 – Jul 27, 1994 12 104°F (Jul 25) 101°F 77°F
9 Aug 11, 1930 – Aug 22, 1930 12 103°F (Aug 19) 101°F 75°F
10 Aug 1, 2009 – Aug 12, 2009 12 103°F (Aug 6) 102°F 77°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

77
2026 total
above-normal nights
47.3
Avg / summer
1970–2020
83
Most in a summer
2011

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 (1885–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1885, annual totals have trended +0.47" per decade, about +6.6" 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 Antonio is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

26.54"
2026 YTD
Normal: 22.01"
+4.53"
0.00"
September so far
September normal: 3.88"
-3.88"
7
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 Antonio is 4.53" ahead of the normal pace

Period Review — Sep 1 – Nov 30, 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)
2026 is still under way for this window — totals and rankings appear once November 30 passes.

Average Temperature by Year — Sep 1 – Nov 30

1885–2025 · 2026 highlighted · trend +0.12° per decade (warming since 1885)

Precipitation by Year — Sep 1 – Nov 30

1885–2025 · 2026 highlighted · trend +0.24" per decade (wetter since 1885)

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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