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Ottawa Weather Records

YOW_Weather@ottawa.place

<p>Rolf Campbell: Weather historian and forecaster. I gather statistics from Environment Canada and across the web to generate alerts &amp; forecasts. This is a monitored account, but sometimes it takes me a couple of weeks to catch up. If you like this content, leave me a tip here: <a href="https://www.buymeacoffee.com/RolfCampbell" target="_blank" rel="nofollow noopener" translate="no"><span class="invisible">https://www.</span><span class="">buymeacoffee.com/RolfCampbell</span><span class="invisible"></span></a></p>

Posts

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    Today is the 2nd rainiest day on record in #Ottawa: 111.4mm. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥉Today is #Ottawa&amp;#39;s 113th consecutive day with maximum temperature ≥18°C which puts this run in 3rd place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    Streak over. After 90 consecutive days with maximum temperature ≥19°C in #Ottawa, the maximum temperature was only 18.2°C yesterday. We made it to 10th place, only 21 days behind the record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥉Streak over. After 113 consecutive days with maximum temperature ≥18°C in #Ottawa, the maximum temperature was only 17.7°C yesterday. We made it to 3rd place, only 2 days behind the record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    Historically, today is #Ottawa&amp;#39;s last day of the year with a median high temperature ≥ 20°C. #YowWx #OttWeather

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    Yesterday was #Ottawa&amp;#39;s 17th consecutive September day with &amp;lt;1mm of precip which puts this run in 4th place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    Streak over. After 11 consecutive September days with no precipitation in #Ottawa, there was a trace of precipitation today. We made it to 6th place, only 7 days behind the record. #YowWx #OttWeather

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    With a mean wind of 22.1km/h, yesterday was #Ottawa&amp;#39;s windiest day since Jun 19th. #YowWx #OttWeather

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    🥈Yesterday was #Ottawa&amp;#39;s 18th consecutive September day with &amp;lt;1mm of precip which puts this run in 2nd place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥈With a mean wind of 22km/h, yesterday was #Ottawa&amp;#39;s windiest Sep 27th in more than 60 years, since 1964. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥈Yesterday was #Ottawa&amp;#39;s 19th consecutive September day with &amp;lt;1mm of precip which puts this run in 2nd place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥈Yesterday was #Ottawa&amp;#39;s 20th consecutive September day with &amp;lt;1mm of precip which puts this run in 2nd place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    #Ottawa&amp;#39;s weather extremes for September 2026: #YowWx #OttWeather

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    September summary: #Ottawa broke (or almost broke) 0 records during September. #YowWx #OttWeather

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    During September 2026, #Ottawa had 15 above median days and 15 below median days (by maximum temperature). #YowWx #OttWeather

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    #Ottawa just had its lowest September maximum temperature since September 2009. The maximum temperature was 26.6°C. #YowWx #OttWeather

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    🥇Wednesday was #Ottawa&amp;#39;s 30th consecutive September day with minimum temperature ≥4°C which puts this run in a 11-way tie for 1st place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    🥇Wednesday was #Ottawa&amp;#39;s 21st consecutive September day with &amp;lt;1mm of precip which puts this run in a 2-way tie for 1st place for the longest run on record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    For only the 12th time in recorded history, #Ottawa stayed above 3.9°C during an entire September (September 2026). #YowWx #OttWeather

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    Streak over. After 119 consecutive days with maximum temperature ≥17°C in #Ottawa, the maximum temperature was only 14.9°C yesterday. We made it to 6th place, only 11 days behind the record. #YowWx #OttWeather #YOW #OttNews #ONWx

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    With 111.4mm of rain, today is #Ottawa&#39;s wettest day in more than 20 years, since Sep 9th, 2004. #YowWx #OttWeather #OttNews

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    With a humidex of 47.0, tomorrow is forecast to be #Ottawa&#39;s muggiest day in 8 years, since 🇨🇦Canada Day🇨🇦, 2018. #YowWx #OttWeather

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    Today is #Ottawa&amp;#39;s first 25°C of the year. Typical first is May 2. Record earliest is Mar 18, 2012; latest Jun 12, 1983. #YowWx #OttWeather

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    Today is #Ottawa&amp;#39;s first 26°C of the year. Typical first is May 4. Record earliest is Mar 21, 2012; latest Jun 15, 1924. #YowWx #OttWeather

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    Today is #Ottawa&amp;#39;s first 27°C of the year. Typical first is May 14. Record earliest is Mar 21, 2012; latest Jul 2, 1886. #YowWx #OttWeather

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    Today is #Ottawa&amp;#39;s first 28°C of the year. Typical first is May 17. Record earliest is Apr 2, 2010; latest Jul 9, 1885. #YowWx #OttWeather

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    Today is #Ottawa&amp;#39;s first 29°C of the year. Typical first is May 25. Record earliest is Apr 13, 2023; latest Jul 9, 1885. #YowWx #OttWeather

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    @stephanie @mWare @WTL that was Saturday. It was 12° c and reasonably windy in the morning. I cooled my whole house down. My basement was downright cold, and the second story was still very comfortable

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    With a ~4pm temp of 29.2°C, today is #Ottawa&amp;#39;s hottest day since Oct 6th. #YowWx #OttWeather

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    🥇With a 5pm humidex of 35.3, today is #Ottawa&amp;#39;s muggiest May 19th since records began in 1953. #YowWx #OttWeather #YOW #OttNews #ONWx