June
Other strong months: August and July
81/100 weather score
Canada · 1991–2020
Best time to visit
Ottawa South
For Ottawa South, June has the most comfortable weather in our climate comparison. Typical daytime highs are 24.4°C, nights average 13.6°C, and rainfall totals about 95 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthJune
Typical daytime high24.4°C
Typical night-time low13.6°C
June rainfall95 mm
May
Other strong months: September and June
79/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
5 months fit your choices for Ottawa South
The lowest comfort score is 5 out of 100. January, February, March, November and December share that score. In January, that is mainly because days reach only -5.2°C, 29° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Ottawa South?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Ottawa South?
June is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 24.4°C and 95 mm of rain.
What is the hottest month in Ottawa South?
July is hottest in this record, with a typical daytime high of 26.8°C and a night-time low of 16°C.
Which month has the least rain?
February has the lowest monthly rainfall total at 52 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | -5.2°C | -13.7°C | 65 mm | 11 | 9 h 05 | 5 | Strong coverage |
| February | -3.4°C | -12.7°C | 52 mm | 8.9 | 10 h 19 | 5 | Strong coverage |
| March | 2.6°C | -6.6°C | 62 mm | 9.1 | 11 h 46 | 5 | Strong coverage |
| April | 11.3°C | 1.3°C | 80 mm | 10.2 | 13 h 26 | 21 | Strong coverage |
| May | 19.6°C | 8.3°C | 80 mm | 10.4 | 14 h 51 | 60 | Strong coverage |
| June | 24.4°C | 13.6°C | 95 mm | 10.6 | 15 h 39 | 81 | Strong coverage |
| July | 26.8°C | 16°C | 92 mm | 9.7 | 15 h 20 | 75 | Strong coverage |
| August | 25.7°C | 14.8°C | 87 mm | 8.9 | 14 h 06 | 81 | Strong coverage |
| September | 21.3°C | 10.5°C | 87 mm | 9.3 | 12 h 28 | 70 | Strong coverage |
| October | 13.4°C | 4.5°C | 89 mm | 10.7 | 10 h 52 | 32 | Strong coverage |
| November | 5.9°C | -1.5°C | 70 mm | 9.8 | 9 h 26 | 5 | Strong coverage |
| December | -1.6°C | -8.5°C | 72 mm | 11.4 | 8 h 44 | 5 | Strong coverage |
What has changed
Recent daytime highs are
1.6°C warmer in Ottawa South.
Each bar shows the difference between the 2011–2025 average daytime high and the 1961–1990 average for the same month at the same station. A blank month does not have enough older observations for a reliable comparison.
Jan
+2.2
Feb
+1.7
Mar
+1.3
Apr
+0.4
May
+1.8
Jun
+0.9
Jul
+1.3
Aug
+1.3
Sep
+2.5
Oct
+1.7
Nov
+1.2
Dec
+3.0
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 12.0°C30 Jan 2013 | -37.8°C19 Jan 1925 | 56 mm29 Jan 1894 | 139 mm1924 · driest 12 mm in 1961 | 135 |
| February | 16.0°C28 Feb 2024 | -38.3°C17 Feb 1934 | 46 mm8 Feb 1895 | 157 mm1960 · driest 3 mm in 1978 | 134 |
| March | 26.7°C21 Mar 2012 | -36.7°C4 Mar 1938 | 49 mm12 Mar 1962 | 144 mm1899 · driest 9 mm in 1957 | 135 |
| April | 31.2°C27 Apr 1990 | -20.6°C1 Apr 1923 | 48 mm15 Apr 1956 | 167 mm2019 · driest 13 mm in 2001 | 133 |
| May | 35.2°C26 May 2010 | -7.2°C10 May 1902 | 76 mm17 May 1916 | 186 mm1986 · driest 6 mm in 1903 | 132 |
| June | 36.7°C22 Jun 1921 | 0.0°C4 Jun 1910 | 78 mm17 Jun 1946 | 190 mm2002 · driest 21 mm in 1991 | 134 |
| July | 37.8°C13 Jul 1921 | 3.3°C10 Jul 1942 | 85 mm24 Jul 2018 | 250 mm1899 · driest 17 mm in 2012 | 134 |
| August | 37.8°C1 Aug 1917 | 1.7°C30 Aug 1934 | 90 mm23 Aug 1943 | 230 mm1943 · driest 10 mm in 1899 | 134 |
| September | 36.7°C11 Sep 1931 | -4.4°C28 Sep 1947 | 109 mm9 Sep 2004 | 168 mm1986 · driest 12 mm in 1897 | 134 |
| October | 31.0°C3 Oct 2023 | -12.8°C26 Oct 1933 | 70 mm29 Oct 2017 | 188 mm1995 · driest 6 mm in 1924 | 134 |
| November | 24.0°C5 Nov 2022 | -23.9°C30 Nov 1925 | 53 mm25 Nov 1912 | 197 mm1927 · driest 19 mm in 1939 | 135 |
| December | 17.2°C4 Dec 2012 | -38.9°C29 Dec 1933 | 73 mm31 Dec 1933 | 167 mm1933 · driest 15 mm in 1963 | 135 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 30 | 2 | 13 |
| February | 0 | 0 | 26 | 1 | 10 |
| March | <1 | 0 | 25 | 2 | 7 |
| April | <1 | <1 | 12 | 3 | 2 |
| May | 6 | <1 | <1 | 3 | <1 |
| June | 14 | 3 | 0 | 3 | 0 |
| July | 22 | 6 | 0 | 3 | 0 |
| August | 18 | 4 | 0 | 3 | 0 |
| September | 7 | 1 | <1 | 3 | 0 |
| October | <1 | 0 | 6 | 3 | <1 |
| November | 0 | 0 | 19 | 2 | 5 |
| December | 0 | 0 | 28 | 2 | 11 |
The best month has moved. On the 1961–1990 numbers the strongest month here was August (scoring 89); on 2011–2025 it is June (87). Both are scored the same way, from the same station — only the climate underneath changed.
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | 0% | 35% | 6% | 45% | -9.7–-2.2°C |
| February | 0% | 33% | 6% | 42% | -7.7–-1.4°C |
| March | <1% | 30% | 7% | 39% | -1.4–5.2°C |
| April | 7% | 31% | 7% | 38% | 7.8–13.5°C |
| May | 33% | 32% | 8% | 42% | 16.4–21.8°C |
| June | 58% | 33% | 10% | 42% | 22.2–25.9°C |
| July | 67% | 31% | 10% | 38% | 24.8–28.4°C |
| August | 66% | 29% | 9% | 34% | 23.4–27.4°C |
| September | 40% | 31% | 9% | 39% | 18.2–23.0°C |
| October | 10% | 32% | 8% | 40% | 11.0–15.5°C |
| November | <1% | 34% | 8% | 46% | 2.4–7.4°C |
| December | 0% | 36% | 7% | 51% | -6.8–0.3°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 6094835
- NOAA station
- CA006105976 · OTTAWA CDA
- Station distance
- 2.5 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 29 usable years
- Daylight
- Calculated from latitude 45.39°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Ottawa South is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
How travel partnerships will work