Ontario, OR

Oregon · Records since 1945–2026

☀️ 65°F
Currently in Ontario
As of 12:30 PM MDT

Records for September 7

🔥 Record High

102°F

September 7, 2022

+16° from 86° normal

❄ Record Low

32°F

September 7, 1945

-20° from 52° normal
🌞 Normal high: 86°F 🌑 Normal low: 52°F 1991–2020 normals

All-Time Records — Ontario

🔥
113°F
Hottest Day Ever
Jul 12, 1967
❄
-25°F
Coldest Day Ever
Jan 22, 1962
🌧
1.59"
Wettest Day Ever
Sep 14, 1959
☃
10.0"
Most Snow in One Day
Jan 8, 1993

Top 10 Record Highs — September 7

# Temp Date
🏆 102°F September 7, 2022
2 99°F September 7, 1967
3 97°F September 7, 1957
4 95°F September 7, 1977
5 95°F September 7, 1956
6 94°F September 7, 1990
7 94°F September 7, 1975
8 94°F September 7, 1958
9 94°F September 7, 1951
10 93°F September 7, 2024

Top 5 Record Lows — September 7

# Temp Date
🥶 32°F September 7, 1945
2 37°F September 7, 1992
3 38°F September 7, 2000
4 39°F September 7, 1976
5 40°F September 7, 2010
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 1945–2026. Climate normals represent the 1991–2020 average.

Heat Wave Summary — Ontario

threshold: 102°F (90th percentile of historical Jun–Aug highs)
5.2
Avg heat wave length
days (historical)
107°
Avg peak temp
during heat waves
7
Dangerous nights 2026
Overnights ≥ 70°F
0
Heat waves 2026
so far

2026 Daily High Temperature vs Normal

Year to date
Above normal Below normal

134 of 249 days with data were above the 1991–2020 normal high for their date.

Days ≥ 90°F Per Year

1945–2026
63
2026 so far
64
Avg/year 1970–2025
69
Avg/year (last 10 complete)
94
Most in a year (1967)

Average Daily High by Decade

Full year · complete decades only

Longest Heat Waves — Ontario

# Dates Days Peak Avg High Avg Overnight Low
🏆 Jul 22, 1971 – Aug 14, 1971 24 110°F (Aug 8) 106°F 62°F
2 Jun 15, 1961 – Jun 26, 1961 12 108°F (Jun 17) 105°F 60°F
3 Aug 10, 1967 – Aug 20, 1967 11 109°F (Aug 19) 106°F 55°F
4 Jul 13, 1960 – Jul 22, 1960 10 112°F (Jul 19) 107°F 62°F
5 Jul 17, 1956 – Jul 26, 1956 10 107°F (Jul 23) 104°F 59°F
6 Jun 28, 2021 – Jul 7, 2021 10 107°F (Jun 30) 105°F 68°F
7 Jul 15, 1959 – Jul 23, 1959 9 111°F (Jul 21) 107°F 59°F
8 Jul 3, 1968 – Jul 11, 1968 9 108°F (Jul 4) 105°F 61°F
9 Jul 16, 2024 – Jul 24, 2024 9 108°F (Jul 22) 105°F 68°F
10 Jul 25, 1973 – Aug 2, 1973 9 107°F (Aug 2) 105°F 60°F

Heat Waves Per Year

Warm Summer Nights (Jun–Aug)

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

51
2026 total
above-normal nights
29.1
Avg / summer
1970–2020
72
Most in a summer
2021

Above-Normal Summer Nights Per Year

Average June–August Low by Decade

Overnight lows · complete decades only

Precipitation

Actual vs. 1991–2020 full-month and full-season normals

6.55"
2026 YTD
Normal: 6.31"
+0.24"
0.39"
September so far
September normal: 0.29"
+0.10"
1
2026 heavy rain days
Days with ≥ 1.0"

2026 Accumulation vs. Normal

Running total since Jan 1 against the normal pace for the same date · Ontario is 0.24" ahead of the normal pace

Monthly Precipitation — Last 24 Months

Blue = actual · dashed line = monthly normal

Annual Precipitation Per Year (1945–2026)

Blue = above average · tan = below average · gold = 2026 (partial)
Since 1945, annual totals have trended +0.13" per decade, about +1.0" across the record.

Heavy Rain Days Per Year (≥ 1.0")

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

Month in Review — August 2026

76.2°F

Average temperature · August 2026

64th-warmest month on record

16th-warmest August of 68 on record

+1.3° vs. 74.9° average (1991–2020)
85.1°F
Warmest month ever
July 2021
81.8°F
Warmest August ever
2022
22
Days ≥ 90°F
in August
104°F
Hottest of 2026
Jul 20

Longest 90°F Streak in August

10 consecutive days with highs of at least 90°F (Aug 18–27, 2026, peaking at 99°F)

The longest August streak since 2024 (2 years). The August record is 31 days, set in 1967.

Average August Temperature by Year

1945–2026 · 2026 highlighted · trend +0.41° per decade (warming since 1945)

Precipitation — August 2026

Month total against the 1991–2020 average and every other August on record

0.01"
Total precipitation
August 2026
-0.12"
vs. average
Normal: 0.13" · 8% of normal
18th-driest
August rank
of 78 on record
2.58"
Wettest August ever
1968 · driest 0.00" (1946)

August Precipitation by Year

1945–2026 · 2026 highlighted

Wettest Augusts on Record

# Year Total
1 1968 2.58"
2 2023 2.29"
3 1979 1.60"
4 1965 1.29"
5 1989 1.19"
6 2010 0.94"
7 1956 0.83"
8 1976 0.83"
9 2025 0.70"
10 1960 0.67"

Driest Augusts on Record

# Year Total
1 2018 0.00"
2 2013 0.00"
3 2012 0.00"
4 2011 0.00"
5 2008 0.00"
6 1999 0.00"
7 1998 0.00"
8 1996 0.00"
9 1994 0.00"
10 1992 0.00"

Warmest Augusts on Record

# Year Avg Temp
1 2022 81.8°F
2 1971 80.0°F
3 1961 79.6°F
4 1967 79.5°F
5 2013 78.2°F
6 1958 77.8°F
7 2019 77.4°F
8 2020 77.4°F
9 2017 77.1°F
10 2023 76.9°F

Warmest Months on Record (Any Month)

# Month Avg Temp
1 July 2021 85.1°F
2 July 2022 82.8°F
3 July 2007 82.3°F
4 July 2024 82.1°F
5 August 2022 81.8°F
6 July 1960 81.7°F
7 July 2017 81.7°F
8 July 2023 81.6°F
9 July 1985 81.6°F
10 July 2003 81.3°F

Nearby Stations — August 2026

How the same month ranked at the closest reporting stations

Station Avg Temp August Rank
Ontario, OR 76.2°F 16th of 68
Boise, ID 78.8°F 2nd of 150
Baker City, OR 66.1°F 42nd of 99
McCall, ID 65.8°F 5th of 103
Stanley, ID 59.4°F 9th of 63
About this data. Monthly averages are the mean of daily average temperatures, computed from NOAA Threadex records via RCC ACIS. Months missing more than three days of observations are excluded from the rankings, so the in-progress month never appears. Rankings cover 850 complete months on record. Precipitation totals sum the daily reports for the month, with trace amounts counted as zero. A month missing any day of precipitation data is left out entirely (an unreported day is unreported rain), so the precipitation ranking covers 78 complete Augusts. Normals are the 1991–2020 mean for the same calendar month. Trend lines are a least-squares fit across every year shown.

Fall in Review — Fall 2026

September 1 – November 30, 2026

Fall 2026 is still under way. Season totals and rankings appear once November closes; the markers below update as they happen.

Summer to Winter — 2026

Each turning point of the season against its 1991–2020 normal date, with the earliest and latest on record

Marker 2026 Normal vs. normal Earliest Latest Drift
Last 90°F day
The final day of summer heat
 Aug 27
so far
 Sep 14 Aug 17, 1989 Oct 7, 1971 -0.6 d/decade
Last 80°F day
The last genuinely warm afternoon
 Sep 1
so far
 Oct 3 Sep 5, 1985 Oct 25, 1977 -0.4 d/decade
First high below 50°F
The first afternoon that stays cold
 not yet Nov 2 Oct 7, 1946 Nov 22, 2025
First 32°F freeze
Growing season over
 not yet Oct 7 Sep 7, 1945 Nov 5, 2015 +3.0 d/decade
First 28°F hard freeze
Cold enough to end tender growth
 not yet Oct 18 Sep 18, 1965 Nov 11, 2014 +1.9 d/decade
First 20°F night
Winter cold arriving
 not yet Nov 14 Oct 6, 1974 Dec 27, 2021 +2.0 d/decade
First measurable snow
0.1" or more in a day
 not yet — Oct 27, 1971 Dec 24, 1988 +0.8 d/decade

Drift is a least-squares fit across every year on record. Positive means the marker has been arriving later.

First Freeze by Year

The first 32°F night of each autumn since 1945 · trending +3.0 days later per decade

159
Normal length
1991–2020 average
191
Longest on record
2015
74
Shortest on record
1976

Growing Season Length by Year

Days between the last spring freeze and the first fall freeze · trending +4.9 days longer per decade

Fall Average Temperature by Year

1945–2025 · 2026 highlighted · trend +0.23° per decade (warming since 1945)

Fall Precipitation by Year

1945–2025 · 2026 highlighted · trend -0.06" per decade (drier since 1945)

About this data. Fall is meteorological autumn, September 1 through November 30, the window NOAA uses for seasonal statistics. Seasonal temperature is the day-weighted mean of the three monthly means; precipitation is their sum, and a season missing any of the three months is left out of the rankings. Freeze, heat and snow markers come from daily NOAA Threadex observations via RCC ACIS: freezes and snow are the first occurrence on or after July 1, and the last 90°F and 80°F days are the final ones anywhere in the calendar year. Growing season counts the freeze-free days between the last spring 32°F and the first fall 32°F.
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