Ottawa South · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Ottawa South & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
78°
Thu, Sep 3
Coldest night
41°
Wed, Sep 9
Days with precip
3 / 14
of 14 forecast days
Nicest day
Sun, Sep 6
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
73° 52°
21% precip chance
Sat 12 – Sun 13 Sep
63° 42°
12% precip chance
Sat 19 – Sun 20 Sep
68° 51°
typical range
Sat 26 – Sun 27 Sep
70° 51°
typical range
30 days — Ottawa South
14 forecast + 16 climatology
Wed · Today Showers
76°61°7.5 mm⌄
Wind10 mph SE
Gusts19 mph
UV index4 – Moderate
Precip chance88%
Sunrise06:25
Sunset19:39
Thu · Tomorrow Fog
78°64°0.3 mm⌄
Wind9 mph W
Gusts13 mph
UV index6 – High
Precip chance46%
Sunrise06:26
Sunset19:37
Friday 4/9 Mostly cloudy
72°61°17%⌄
Wind10 mph NW
Gusts19 mph
UV index6 – Moderate
Precip chance17%
Sunrise06:28
Sunset19:35
Saturday 5/9 Sunny
73°55°0.1 mm⌄
Wind9 mph N
Gusts16 mph
UV index3 – Low
Precip chance21%
Sunrise06:29
Sunset19:33
Sunday 6/9 Sunny
71°52°10%⌄
Wind6 mph N
Gusts16 mph
UV index6 – High
Precip chance10%
Sunrise06:30
Sunset19:31
Monday 7/9 Mostly cloudy
70°51°0.6 mm⌄
Wind13 mph NW
Gusts28 mph
UV index5 – Moderate
Precip chance58%
Sunrise06:31
Sunset19:29
Tuesday 8/9 Mostly cloudy
59°45°10%⌄
Wind11 mph N
Gusts27 mph
UV index4 – Moderate
Precip chance10%
Sunrise06:32
Sunset19:28
Wednesday 9/9 Sunny
61°41°5%⌄
Wind6 mph N
Gusts14 mph
UV index5 – Moderate
Precip chance5%
Sunrise06:34
Sunset19:26
Thursday 10/9 Mostly cloudy
58°49°0.4 mm⌄
Wind11 mph S
Gusts21 mph
UV index3 – Moderate
Precip chance52%
Sunrise06:35
Sunset19:24
Friday 11/9 Showers
75°57°5.6 mm⌄
Wind17 mph W
Gusts29 mph
UV index5 – Moderate
Precip chance87%
Sunrise06:36
Sunset19:22
Saturday 12/9 Sunny
63°49°6%⌄
Wind10 mph N
Gusts24 mph
UV index5 – Moderate
Precip chance6%
Sunrise06:37
Sunset19:20
Sunday 13/9 Mostly cloudy
62°42°12%⌄
Wind5 mph SE
Gusts15 mph
UV index4 – Moderate
Precip chance12%
Sunrise06:39
Sunset19:18
Monday 14/9 Mostly cloudy
59°48°8.4 mm⌄
Wind10 mph NW
Gusts26 mph
UV index4 – Moderate
Precip chance87%
Sunrise06:40
Sunset19:16
Tuesday 15/9 Sunny
59°45°8%⌄
Wind12 mph N
Gusts26 mph
UV index5 – Moderate
Precip chance8%
Sunrise06:41
Sunset19:14
Wednesday 16/9 Rain (climatological)
69°52°3.2 mm⌄
Day≈63–74°
Night≈47–58°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
71°54°20%⌄
Day≈66–77°
Night≈49–59°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
71°54°20%⌄
Day≈66–76°
Night≈48–59°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Rain (climatological)
68°52°6.3 mm⌄
Day≈62–73°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
67°51°20%⌄
Day≈62–72°
Night≈46–57°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
64°50°20%⌄
Day≈59–70°
Night≈44–55°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Rain (climatological)
61°48°2.5 mm⌄
Day≈56–66°
Night≈42–53°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
65°50°20%⌄
Day≈60–71°
Night≈45–56°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
72°54°20%⌄
Day≈67–78°
Night≈49–60°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Rain (climatological)
74°55°6.2 mm⌄
Day≈68–79°
Night≈50–61°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
70°53°20%⌄
Day≈64–75°
Night≈47–58°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
66°51°20%⌄
Day≈60–71°
Night≈45–56°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Rain (climatological)
63°49°5.3 mm⌄
Day≈58–69°
Night≈44–54°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
62°49°20%⌄
Day≈57–68°
Night≈43–54°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
64°50°20%⌄
Day≈59–70°
Night≈44–55°
Precip≈2.0 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Rain (climatological)
54°39°3.8 mm⌄
Day≈49–59°
Night≈33–44°
Precip≈2.0 in / October
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Ottawa South, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.