Env. Canada, European, American side by side around Ottawa South and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
Ottawa South, 08 is at its warmest in Jul (average highs near 27°C) and coldest in Feb (lows around -11°C), with roughly 1155 mm of precipitation across the year. Below, compare what Env. Canada, European, American forecast for Ottawa South right now, and see exactly where they disagree.
Ottawa South climate by month
average daytime high and overnight low across a typical year
Jan
-2°
-9°
Feb
0°
-11°
Mar
5°
-4°
Apr
13°
1°
May
20°
8°
Jun
24°
14°
Jul
27°
18°
Aug
24°
16°
Sep
23°
13°
Oct
16°
7°
Nov
7°
0°
Dec
0°
-6°
Common questions
What's the weather in Ottawa South today?
On this page we show what Env. Canada, European, American each forecast for Ottawa South today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Ottawa South today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from Env. Canada, European, American for Ottawa South and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Ottawa South?
No single model is always right. Env. Canada, European, American each run their own physics, so we line all three up: when they agree the Ottawa South forecast is reliable, and when they split you should expect surprises. See our tested CA accuracy scoreboard for how the models compare.
What is the warmest month in Ottawa South?
Jul is typically the warmest month in Ottawa South, with average highs around 27°C.
How cold does Ottawa South get?
The coldest month in Ottawa South is Feb, when overnight lows average about -11°C.
How much rain does Ottawa South get?
Ottawa South sees roughly 1155 mm of precipitation a year, with Jul usually the wettest month.
The forecasts Canadians check
Environment Canada runs the national GEM model as open data, so it sits right in the comparison above. The Weather Network and AccuWeather keep theirs closed, so we link you to them.