Merced, CA

California · Records since 1899–2026

☀️ 86°F
Currently in Merced
As of 11:00 AM PDT

Records for September 11

🔥 Record High

106°F

September 11, 1904

+14° from 92° normal

❄ Record Low

44°F

September 11, 1952

-14° from 58° normal
🌞 Normal high: 92°F 🌑 Normal low: 58°F 1991–2020 normals

All-Time Records — Merced

🔥
116°F
Hottest Day Ever
Sep 6, 2022
❄
15°F
Coldest Day Ever
Dec 24, 1990
🌧
2.20"
Wettest Day Ever
Mar 9, 1911
☃
2.0"
Most Snow in One Day
Jan 1, 1916

First & Last Dates — Merced

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)
329 days
Longest growing season
1997
145 days
Shortest growing season
1906
273 days
Normal growing season
1991–2020 average

Top 10 Record Highs — September 11

# Temp Date
🏆 106°F September 11, 1904
2 104°F September 11, 1922
3 102°F September 11, 1953
4 101°F September 11, 2014
5 101°F September 11, 1955
6 101°F September 11, 1948
7 101°F September 11, 1924
8 100°F September 11, 2009
9 100°F September 11, 1979
10 100°F September 11, 1970

Top 5 Record Lows — September 11

# Temp Date
🥶 44°F September 11, 1952
2 45°F September 11, 1985
3 45°F September 11, 1905
4 47°F September 11, 1928
5 48°F September 11, 2005
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 1899–2026. Climate normals represent the 1991–2020 average.
1
day
Hot Streak
1 consecutive day at or above 103°F · since September 10
2 more days to heat wave status

Heat Wave Summary — Merced

threshold: 103°F (90th percentile of historical Jun–Aug highs)
4.3
Avg heat wave length
days (historical)
107°
Avg peak temp
during heat waves
2
Dangerous nights 2026
Overnights ≥ 70°F
1
Heat waves 2026
so far

Days ≥ 90°F Per Year

1899–2026
88
2026 so far
96
Avg/year 1970–2025
108
Avg/year (last 10 complete)
129
Most in a year (1991)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Merced

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 2, 1906 – Jul 15, 1906 14 109°F (Jul 12) 106°F 64°F
2 Jul 2, 2024 – Jul 13, 2024 12 111°F (Jul 6) 108°F 70°F
3 Jul 18, 1931 – Jul 28, 1931 11 112°F (Jul 27) 108°F 70°F
4 Jul 16, 2006 – Jul 26, 2006 11 112°F (Jul 23) 107°F 72°F
5 Sep 1, 2022 – Sep 9, 2022 9 116°F (Sep 6) 108°F 69°F
6 Aug 9, 1901 – Aug 17, 1901 9 110°F (Aug 12) 106°F 64°F
7 Aug 9, 1906 – Aug 17, 1906 9 109°F (Aug 16) 106°F 66°F
8 Jul 31, 1901 – Aug 7, 1901 8 111°F (Aug 3) 106°F 71°F
9 Aug 9, 1996 – Aug 16, 1996 8 110°F (Aug 13) 107°F 69°F
10 Jul 10, 1917 – Jul 17, 1917 8 108°F (Jul 13) 104°F 68°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

56
2026 total
above-normal nights
36.4
Avg / summer
1970–2020
76
Most in a summer
2014

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 (1899–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1899, annual totals have trended +0.09" per decade, about +1.1" 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 Merced is tracking against normal, year to date

Daily High Temperature vs Normal

Above normal Below normal

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

Precipitation, Year to Date

4.23"
2026 YTD
Normal: 8.19"
-3.96"
0.00"
September so far
September normal: 0.05"
-0.05"
0
2026 heavy rain days
Days with ≥ 1.0"

Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Merced is 3.96" 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)
78.0°F
Average temperature
31st-warmest of 124
+0.7°
vs. average
Normal: 77.3°F (1991–2020)
0.00"
Precipitation
1st-driest of 112
-0.01"
vs. average
Normal: 0.01" · 0% of normal

Average Temperature by Year — Aug 11 – Sep 10

1899–2026 · 2026 highlighted · trend +0.22° per decade (warming since 1899)

Precipitation by Year — Aug 11 – Sep 10

1899–2026 · 2026 highlighted

Warmest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 2022 83.6°F
2 1967 82.0°F
3 2020 81.8°F
4 1904 81.8°F
5 2017 80.5°F
6 2012 80.2°F
7 2013 79.8°F
8 1923 79.7°F
9 1906 79.5°F
10 1984 79.4°F

Coolest Aug 11 – Sep 10 on Record

# Year Avg Temp
1 1979 70.0°F
2 1978 71.1°F
3 1911 71.2°F
4 1943 72.8°F
5 1899 72.8°F
6 1925 72.8°F
7 1941 72.8°F
8 2000 72.8°F
9 1949 73.0°F
10 1985 73.1°F

Wettest Aug 11 – Sep 10 on Record

# Year Total
1 1978 0.74"
2 1983 0.51"
3 1965 0.49"
4 1952 0.22"
5 1976 0.22"
6 1912 0.13"
7 1964 0.13"
8 1975 0.13"
9 1972 0.11"
10 1991 0.11"

Driest Aug 11 – Sep 10 on Record

# Year Total
1 2026 0.00"
2 2024 0.00"
3 2022 0.00"
4 2021 0.00"
5 2020 0.00"
6 2019 0.00"
7 2018 0.00"
8 2017 0.00"
9 2016 0.00"
10 2015 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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