Ottawa Weather Records

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

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

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

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

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

#Ottawa's weather extremes for September 2026: #YowWx #OttWeather

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

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

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

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

🥉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

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

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

🥇With a max gust of 74km/h, Friday was #Ottawa's windiest May 29th since records began in 1955. #YowWx #OttWeather #YOW #OttNews #ONWx

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

Today at 6pm, the humidity was 17% which made it #Ottawa's driest hour in more than 2 years, since Mar 24th, 2024 #YowWx #OttWeather

With a min humidity of 94%, Wednesday was #Ottawa's moistest day since Jul 7th. #YowWx #OttWeather

May summary: #Ottawa broke (or almost broke) 4 records during May. #YowWx #OttWeather

@stephanie@ottawa.place @mWare@ottawa.place @WTL@mastodon.social 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

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

With a ~2pm temp of 24.9°C, today is #Ottawa's hottest day since Oct 19th. #YowWx #OttWeather

Today is #Ottawa's first 24°C of the year. Typical first is April 30. Record earliest is Mar 18, 2012; latest Jun 12, 1983. #YowWx #OttWeather

Today is #Ottawa's first 21°C of the year. Typical first is April 18. Record earliest is Mar 18, 2012; latest May 26, 1929. #YowWx #OttWeather

With a ~3pm temp of 29.5°C, Tuesday was #Ottawa's hottest day since Oct 5th. #YowWx #OttWeather

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

Today is #Ottawa's first 22°C of the year. Typical first is April 18. Record earliest is Mar 18, 2012; latest May 28, 1997. #YowWx #OttWeather

🥈With a low of 19.1°C, yesterday was #Ottawa's highest low temperature recorded on May 19th in more than 60 years, since 1962. #YowWx #OttWeather #YOW #OttNews #ONWx

🥇Wednesday was #Ottawa'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

🥉Today is #Ottawa'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

#Ottawa just had its windiest May since May 2002. Mean wind was 16.2 km/h. #YowWx #OttWeather

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

Historically, today is #Ottawa's first day of the year with a median high temperature ≥ 20°C. #YowWx #OttWeather

Today is #Ottawa's first 23°C of the year. Typical first is April 20. Record earliest is Mar 18, 2012; latest May 28, 1997. #YowWx #OttWeather

Near record rain. 18.8mm of rain brought #Ottawa within 5.0 mm of the most rain recorded on Apr 14th. #YowWx #OttWeather

During May 2026, #Ottawa had 11 above median days and 20 below median days (by maximum temperature). #YowWx #OttWeather

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

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

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

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

With a wind gust of 74km/h, Friday was #Ottawa's windiest day since Jan 9th. #YowWx #OttWeather

For only the 10th time in recorded history, #Ottawa recorded a mean wind above 16km/h during a May (May 2026). #YowWx #OttWeather #YOW #OttNews #ONWx

🥇Wednesday was #Ottawa's 21st consecutive September day with <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

#Ottawa's weather extremes for meteorological spring 2026: #YowWx #OttWeather

#Ottawa's weather extremes for May 2026: #YowWx #OttWeather

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

Today at 5pm, the humidity was 19% which made it #Ottawa's driest hour since Apr 17th, 2025 #YowWx #OttWeather

Yesterday's low of 19.1°C was the highest low temperature #Ottawa has recorded since Aug 13th. #YowWx #OttWeather