Brownsville, TX

Texas · Records since 1878–2026

☀️ 97°F Feels like 103°
Currently in Brownsville
As of 1:30 PM CDT
🔥 3° below today's record of 100°F

Records for September 11

🔥 Record High

100°F

September 11, 1900

+7° from 93° normal

❄ Record Low

67°F

September 11, 2017

-9° from 76° normal
🌞 Normal high: 93°F 🌑 Normal low: 76°F 1991–2020 normals

All-Time Records — Brownsville

🔥
106°F
Hottest Day Ever
Aug 28, 2023
❄
12°F
Coldest Day Ever
Feb 13, 1899
🌧
12.09"
Wettest Day Ever
Sep 20, 1967
☃
1.5"
Most Snow in One Day
Dec 25, 2004

First & Last Dates — Brownsville

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)
349 days
Longest growing season
1879
252 days
Shortest growing season
1920

Top 10 Record Highs — September 11

# Temp Date
🏆 100°F September 11, 1900
2 100°F September 11, 1893
3 99°F September 11, 2023
4 99°F September 11, 1902
5 98°F September 11, 1982
6 97°F September 11, 2000
7 97°F September 11, 1989
8 97°F September 11, 1987
9 97°F September 11, 1919
10 96°F September 11, 2012

Top 5 Record Lows — September 11

# Temp Date
🥶 67°F September 11, 2017
2 67°F September 11, 1918
3 67°F September 11, 1882
4 67°F September 11, 1880
5 68°F September 11, 2011
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 1878–2026. Climate normals represent the 1991–2020 average.
49
days
🔥 Heat Wave in Progress
49 consecutive days at or above 97°F · since July 24
Heat wave in progress (3+ days ≥ 97°F)

Heat Wave Summary — Brownsville

threshold: 97°F (90th percentile of historical Jun–Aug highs)
6.1
Avg heat wave length
days (historical)
99°
Avg peak temp
during heat waves
166
Dangerous nights 2026
Overnights ≥ 70°F
3
Heat waves 2026
so far

Days ≥ 90°F Per Year

1878–2026
140
2026 so far
117
Avg/year 1970–2025
166
Avg/year (last 10 complete)
194
Most in a year (2025)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Brownsville

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 24, 2026 – Sep 10, 2026 49 102°F (Aug 2) 99°F 80°F
2 Jul 8, 2023 – Aug 20, 2023 44 103°F (Aug 15) 100°F 80°F
3 Aug 7, 1900 – Sep 3, 1900 28 100°F (Aug 7) 98°F 75°F
4 Aug 23, 2023 – Sep 16, 2023 25 106°F (Aug 28) 100°F 79°F
5 Jul 15, 2022 – Aug 7, 2022 24 98°F (Jul 15) 98°F 79°F
6 Aug 10, 2019 – Sep 1, 2019 23 102°F (Aug 15) 99°F 80°F
7 Aug 8, 2001 – Aug 26, 2001 19 99°F (Aug 13) 98°F 78°F
8 Aug 13, 2018 – Aug 30, 2018 18 99°F (Aug 22) 98°F 79°F
9 Jun 14, 1900 – Jun 30, 1900 17 102°F (Jun 24) 99°F 76°F
10 Jun 1, 2024 – Jun 17, 2024 17 100°F (Jun 5) 98°F 81°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

70
2026 total
above-normal nights
20.0
Avg / summer
1970–2020
69
Most in a summer
2019

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 (1878–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1878, annual totals have trended +0.04" per decade, about +0.5" 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 Brownsville is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

8.92"
2026 YTD
Normal: 16.11"
-7.19"
0.03"
September so far
September normal: 5.73"
-5.70"
3
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Brownsville is 7.19" behind 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

1878–2025 · 2026 highlighted · trend +0.18° per decade (warming since 1878)

Precipitation by Year — Sep 1 – Nov 30

1878–2025 · 2026 highlighted · trend -0.04" per decade (drier since 1878)

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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