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Ottawa weather

Ontario · 1,017,449 inhabitants · Thursday, October 29 · updated 16:21

Air: Fair

16°

Drizzle

Feels like 16°C

Wind

15 km/h

Gusts

42 km/h

Humidity

75 %

Pressure

1011 hPa

Clouds

99 %

Storm

Rise 07:38 Set 17:54 Day 10 h 16 min UV 3 · Moderate

Morning, afternoon, evening

Trend

Afternoon

Drizzle

17°16°

Feels like 17°

Wind ↑ SSW 17 km/h

Gusts 46 km/h

Humidity 64 %

💧 0.2 mm

Evening

Rain showers

15°11°

Feels like 15°

Wind ↑ W 15 km/h

Gusts 38 km/h

Humidity 85 %

💧 0.2 mm

17:00

16°

0.2mm

SW 15

Ottawa forecast in charts · next 7 days

The week ahead: highs and lows

▲ This week runs +5.9° warmer than usual

Highs Lows Usual for the season (1991–2020 average)

Hourly detail

Temperature (°C) Rain (mm) Wind (km/h)

Ottawa climate: what a normal year looks like

Nights typically freeze from November to March, the coldest averaging −14 °C in January.

The hottest stretch is July, when afternoons average 26 °C; the coldest is January, when nights average −14 °C. Between those two months the average temperature changes by 31 °C.

From 15 h 40 min of daylight in late June to 8 h 43 min in late December.

There is no real dry season: monthly rainfall stays between 63 mm and 102 mm on average.

Forecast highs for the coming week average 15 °C, 2 °C warmer than a normal October (13 °C).

30-year averages (1991–2020)
Month	Typical high	Typical low	Rainfall
Jan	−6 °C	−14 °C	79 mm
Feb	−3 °C	−13 °C	63 mm
Mar	2 °C	−7 °C	76 mm
Apr	11 °C	0 °C	95 mm
May	19 °C	8 °C	92 mm
Jun	23 °C	12 °C	102 mm
Jul	26 °C	16 °C	101 mm
Aug	25 °C	15 °C	94 mm
Sep	21 °C	10 °C	96 mm
Oct	13 °C	5 °C	102 mm
Nov	6 °C	−2 °C	87 mm
Dec	−1 °C	−8 °C	85 mm
Whole year	11 °C	2 °C	1,070 mm

Source: our own processing of the ERA5 reanalysis (Copernicus/ECMWF) for 45.41° N, 75.70° W, 1991–2020. ERA5 averages over a 0.25° grid (about 25 km): hills, a coastline or the heat of the city itself can shift local values by a degree or two.

Air you breathe in Ottawa: pollution and pollen

2/6

Fair

European Air Quality Index (EAQI), from Copernicus CAMS

PM2.513µg/m³

PM1014µg/m³

Copernicus CAMS model, updated several times a day.

Rain radar around Ottawa

Rain observed over the last two hours by official weather radars around Ottawa, followed by the radar forecast for the next hour where the weather service provides one.

Full-screen rain radar and next-hour rain on RainAtlas

Rain radar Last two hours, then forecast where available · drag the timeline

Moon over Ottawa

Waning gibbous

87 % illuminated · 18.3 days

Rise 15:57 Set 08:09

Fri 30/10 79%

Sat 31/10 69%

Sun 1/11 59%

Mon 2/11 49% Last quarter

Tue 3/11 38%

Wed 4/11 28%

Thu 5/11 19%

Fri 6/11 12%

Sat 7/11 6%

Sun 8/11 2%

Mon 9/11 0%

Tue 10/11 1% New moon

Moonrise and moonset in local time (America/Toronto); phase and lit fraction from a synodic calculation.

Sea and tides near Ottawa

Tide station used: Britannia Ontario · 10 km away

🌊 Sea surface

11.2 °C

satellite, 29/10

WedWed 28/10

High tide 23:09 0.4 m

TodayThu 29/10

Low tide 07:56 0.4 m

High tide 23:09 0.5 m

TomorrowFri 30/10

Low tide 08:04 0.4 m

High tide 23:14 0.5 m

SatSat 31/10

Low tide 08:13 0.4 m

High tide 23:12 0.5 m

Indicative heights above chart datum. Coefficient: 20 for the weakest tides, 120 for the strongest.

Look up a past day in Ottawa

Curious about the weather in Ottawa on a given day? Choose a date: we read it from the ERA5 reanalysis (ECMWF / Copernicus C3S), which runs until about a week ago.

Ottawa weather at a glance

This page gathers everything about the weather in Ottawa, Ontario: conditions now, the forecast for each part of the day and the trend for the coming week. At the moment the sky is “drizzle”, it is 16 °C (feels like 16 °C) and the wind blows at 15 km/h.

Expected range today: 1 °C to 17 °C and a dry sky. The forecast comes from the AtmoAtlas engine, which combines ECMWF-AIFS, NOAA GFS and DWD ICON, adjusts cloud cover with METAR reports and uses convective energy (CAPE) to flag storms, plus the tide times for Britannia Ontario.

Other big cities nearby

Gatineau 7 km 17°

Laval 157 km 18°

Montreal 165 km 19°

Ottawa weather data for developers

Use the Ottawa forecast in your own website or app: one JSON call returns weather, air quality, tides and sun and moon times. The free key needs no card.

Create a free key

Where does this forecast come from? Our engine, checked every day against 1125 weather stations