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Ottawa IL Weather - Partly Cloudy - 84°F
Partly Cloudy
84°F
Updated 2:25 pm
Feels Like 82°F
Humidity 48%
Wind SSE 12 mph
Barometer  30.09 in
Dew Point 62°F
Ottawa IL Weather - Partly Cloudy - 29°C
Partly Cloudy
29°C
Updated 2:25 pm
Feels Like 28°C
Humidity 48%
Wind SSE 19 km/h
Barometer  101.9 kPa
Dew Point 17°C
Ottawa, IL Weather and Current Conditionsottawa il weather forecast

Ottawa, IL Weather Forecast

Ottawa Illinois WeatherOttawa, Illinois Weather Weather Forecast
14 Day API Ottawa, IL Weather Forecast. Note: Our 7 day Ottawa, Illinois weather forecast is our most reliable, and specific forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
Ottawa, IL Weather Forecast Dated: 225 PM Tue Sep 08 2026
Expect a mild stretch with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate.

Tuesday, September 8, 2026

Mid-Morning
Ottawa Weather - 2026-09-08 - Morning - Overcast
68°F 20°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-08 - Afternoon - Overcast
86°F 30°C
Overcast
Early-Evening
Ottawa Weather - 2026-09-08 - Evening - Partly Cloudy
77°F 26°C
Partly Cloudy
Warm and summery near 86°F 30°C, overcast through the afternoon, turning sunny this evening, with lower humidity and barometric pressure falling. Winds turning from the S to the SSE at 10 mph 15 km/h. Gusts up to 22 mph 36 km/h.

Wednesday, September 9, 2026

Mid-Morning
Ottawa Weather - 2026-09-09 - Morning - Light Showers
69°F 21°C
Light Showers
Mid-Afternoon
Ottawa Weather - 2026-09-09 - Afternoon - Partly Cloudy
77°F 25°C
Partly Cloudy
Early-Evening
Ottawa Weather - 2026-09-09 - Evening - Overcast
75°F 24°C
Overcast
Comfortable with temperatures reaching 77°F 25°C, scattered morning showers before drying out later, with steady humidity and steady pressure.

Thursday, September 10, 2026

Mid-Morning
Ottawa Weather - 2026-09-10 - Morning - Overcast
65°F 19°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-10 - Afternoon - Sunny
76°F 24°C
Sunny
Early-Evening
Ottawa Weather - 2026-09-10 - Evening - Sunny
69°F 20°C
Sunny
Enjoyable around 76°F 24°C, overcast in the morning, becoming sunny through the afternoon and evening, with steady humidity and steady pressure. Winds blowing from the N at 8 mph 13 km/h.

Friday, September 11, 2026

Mid-Morning
Ottawa Weather - 2026-09-11 - Morning - Sunny
64°F 18°C
Sunny
Mid-Afternoon
Ottawa Weather - 2026-09-11 - Afternoon - Overcast
83°F 28°C
Overcast
Early-Evening
Ottawa Weather - 2026-09-11 - Evening - Sunny
76°F 25°C
Sunny
Warm and summery around 83°F 28°C (feels like 86°F 30°C), sunny in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling. Winds moving from the SSE to the SE at 8 mph 12 km/h.

Saturday, September 12, 2026

Mid-Morning
Ottawa Weather - 2026-09-12 - Morning - Overcast
70°F 21°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-12 - Afternoon - Scattered Showers
78°F 25°C
Scattered Showers
Early-Evening
Ottawa Weather - 2026-09-12 - Evening - Light Showers
70°F 21°C
Light Showers
Mild with a high of 78°F 25°C, scattered downpours possible, with increasing humidity and steady pressure.

Sunday, September 13, 2026

Mid-Morning
Ottawa Weather - 2026-09-13 - Morning - Fog
71°F 22°C
Fog
Mid-Afternoon
Ottawa Weather - 2026-09-13 - Afternoon - Overcast
78°F 25°C
Overcast
Early-Evening
Ottawa Weather - 2026-09-13 - Evening - Overcast
75°F 24°C
Overcast
Pleasant near 78°F 25°C, overcast throughout the day, with lower humidity and steady pressure.

Monday, September 14, 2026

Mid-Morning
Ottawa Weather - 2026-09-14 - Morning - Light Showers
69°F 21°C
Light Showers
Mid-Afternoon
Ottawa Weather - 2026-09-14 - Afternoon - Light Showers
83°F 28°C
Light Showers
Early-Evening
Ottawa Weather - 2026-09-14 - Evening - Sunny
82°F 28°C
Sunny
Warm and summery around 83°F 28°C (feels like 88°F 31°C), intermittent showers through midday, easing by evening, with lower humidity and steady pressure. Winds swinging from the SE to the SSW at 10 mph 15 km/h. Gusts up to 22 mph 35 km/h.

Tuesday, September 15, 2026

Mid-Morning
Ottawa Weather - 2026-09-15 - Morning - Overcast
66°F 19°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-15 - Afternoon - Scattered Showers
71°F 22°C
Scattered Showers
Early-Evening
Ottawa Weather - 2026-09-15 - Evening - Overcast
66°F 19°C
Overcast
Enjoyable around 71°F 22°C, scattered downpours possible, with lower humidity and barometric pressure rising. Winds shifting from the WNW to the NNW at 7 mph 11 km/h.

Wednesday, September 16, 2026

Mid-Morning
Ottawa Weather - 2026-09-16 - Morning - Sunny
62°F 16°C
Sunny
Mid-Afternoon
Ottawa Weather - 2026-09-16 - Afternoon - Sunny
73°F 23°C
Sunny
Early-Evening
Ottawa Weather - 2026-09-16 - Evening - Sunny
68°F 20°C
Sunny
Mild temperatures up to 73°F 23°C, sunny throughout the day, with steady humidity and barometric pressure falling. Winds turning from the E to the ESE at 8 mph 12 km/h.

Thursday, September 17, 2026

Mid-Morning
Ottawa Weather - 2026-09-17 - Morning - Sunny
63°F 17°C
Sunny
Mid-Afternoon
Ottawa Weather - 2026-09-17 - Afternoon - Partly Cloudy
69°F 20°C
Partly Cloudy
Early-Evening
Ottawa Weather - 2026-09-17 - Evening - Partly Cloudy
63°F 17°C
Partly Cloudy
Mild with a high of 69°F 20°C, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure. Winds switching from the S to the SSE at 8 mph 12 km/h.

Friday, September 18, 2026

Mid-Morning
Ottawa Weather - 2026-09-18 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-18 - Afternoon - Scattered Showers
62°F 17°C
Scattered Showers
Early-Evening
Ottawa Weather - 2026-09-18 - Evening - Light Showers
60°F 16°C
Light Showers
Comfortable at 62°F 17°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds moving from the S to the ENE at 6 mph 9 km/h.

Saturday, September 19, 2026

Mid-Morning
Ottawa Weather - 2026-09-19 - Morning - Overcast
52°F 11°C
Overcast
Mid-Afternoon
Ottawa Weather - 2026-09-19 - Afternoon - Overcast
56°F 14°C
Overcast
Early-Evening
Ottawa Weather - 2026-09-19 - Evening - Overcast
52°F 11°C
Overcast
Crisp with a high near 56°F 14°C, overcast throughout the day, with lower humidity and steady pressure. Winds decreasing from N 16 mph 26 km/h to NNE 8 mph 13 km/h.

Sunday, September 20, 2026

Mid-Morning
Ottawa Weather - 2026-09-20 - Morning - Sunny
50°F 10°C
Sunny
Mid-Afternoon
Ottawa Weather - 2026-09-20 - Afternoon - Overcast
60°F 16°C
Overcast
Early-Evening
Ottawa Weather - 2026-09-20 - Evening - Sunny
55°F 13°C
Sunny
Refreshing around 60°F 16°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and barometric pressure falling. Winds shifting from the E to the ENE at 5 mph 8 km/h.

Monday, September 21, 2026

Mid-Morning
Ottawa Weather - 2026-09-21 - Morning - Sunny
54°F 12°C
Sunny
Mid-Afternoon
Ottawa Weather - 2026-09-21 - Afternoon - Sunny
67°F 20°C
Sunny
Early-Evening
Ottawa Weather - 2026-09-21 - Evening - Sunny
61°F 16°C
Sunny
Mildly cool near 67°F 20°C, sunny throughout the day, with steady humidity and steady pressure.

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Weather by the Numbers

Tue, 8th
Ottawa IL Weather - Tuesday, Sep 8, 2026 - Overcast
Hi: 86°F 30°C
Lo: 59°F 15°C
Sunrise 06:29 AM
Sunset 07:17 PM
Wind S 6 mph10 km/h
Dew Point 61°F16°C
uv Index 7
Barometric Pressure 30.12 in1020 mb
POP 12% *
Humidity 52%
Wed, 9th
Ottawa IL Weather - Wednesday, Sep 9, 2026 - Patchy Rain Nearby
Hi: 78°F 26°C
Lo: 69°F 21°C
Sunrise 06:30 AM
Sunset 07:15 PM
Wind WSW 5 mph8 km/h
Dew Point 67°F19°C
uv Index 4
Barometric Pressure 29.97 in1015 mb
POP 23% *
Humidity 78%
Thu, 10th
Ottawa IL Weather - Thursday, Sep 10, 2026 - Sunny
Hi: 76°F 24°C
Lo: 61°F 16°C
Sunrise 06:31 AM
Sunset 07:13 PM
Wind NNE 8 mph12 km/h
Dew Point 58°F15°C
uv Index 4
Barometric Pressure 30 in1016 mb
POP 4% *
Humidity 62%
Fri, 11th
Ottawa IL Weather - Friday, Sep 11, 2026 - Overcast
Hi: 84°F 29°C
Lo: 58°F 14°C
Sunrise 06:32 AM
Sunset 07:11 PM
Wind S 9 mph15 km/h
Dew Point 62°F17°C
uv Index 6
Barometric Pressure 29.91 in1013 mb
POP 13% *
Humidity 62%
Sat, 12th
Ottawa IL Weather - Saturday, Sep 12, 2026 - Light Rain Shower
Hi: 79°F 26°C
Lo: 65°F 18°C
Sunrise 06:33 AM
Sunset 07:10 PM
Wind S 11 mph17 km/h
Dew Point 63°F17°C
uv Index 6
Barometric Pressure 29.91 in1013 mb
POP 29% *
Humidity 59%
Sun, 13th
Ottawa IL Weather - Sunday, Sep 13, 2026 - Overcast
Hi: 79°F 26°C
Lo: 67°F 20°C
Sunrise 06:34 AM
Sunset 07:08 PM
Wind S 5 mph8 km/h
Dew Point 67°F20°C
uv Index 5
Barometric Pressure 30 in1016 mb
POP 19% *
Humidity 72%
Mon, 14th
Ottawa IL Weather - Monday, Sep 14, 2026 - Mist
Hi: 88°F 31°C
Lo: 68°F 20°C
Sunrise 06:35 AM
Sunset 07:06 PM
Wind S 9 mph14 km/h
Dew Point 69°F20°C
uv Index 5
Barometric Pressure 29.91 in1013 mb
POP 73% *
Humidity 92%
Tue, 15th
Ottawa IL Weather - Tuesday, Sep 15, 2026 - Cloudy
Hi: 73°F 23°C
Lo: 61°F 16°C
Sunrise 06:36 AM
Sunset 07:05 PM
Wind NW 13 mph20 km/h
Dew Point 60°F16°C
uv Index 5
Barometric Pressure 30.09 in1019 mb
POP 17% *
Humidity 73%
Wed, 16th
Ottawa IL Weather - Wednesday, Sep 16, 2026 - Sunny
Hi: 74°F 23°C
Lo: 55°F 13°C
Sunrise 06:37 AM
Sunset 07:03 PM
Wind E 5 mph8 km/h
Dew Point 55°F13°C
uv Index 6
Barometric Pressure 30.36 in1028 mb
POP 4% *
Humidity 62%
Thu, 17th
Ottawa IL Weather - Thursday, Sep 17, 2026 - Sunny
Hi: 69°F 21°C
Lo: 58°F 15°C
Sunrise 06:38 AM
Sunset 07:01 PM
Wind S 6 mph9 km/h
Dew Point 46°F8°C
uv Index 5
Barometric Pressure 30.39 in1029 mb
POP 3% *
Humidity 50%
Fri, 18th
Ottawa IL Weather - Friday, Sep 18, 2026 - Overcast
Hi: 66°F 19°C
Lo: 58°F 14°C
Sunrise 06:39 AM
Sunset 06:59 PM
Wind SSW 6 mph10 km/h
Dew Point 52°F11°C
uv Index 4
Barometric Pressure 30.15 in1021 mb
POP 15% *
Humidity 61%
Sat, 19th
Ottawa IL Weather - Saturday, Sep 19, 2026 - Overcast
Hi: 59°F 15°C
Lo: 48°F 9°C
Sunrise 06:40 AM
Sunset 06:58 PM
Wind N 15 mph25 km/h
Dew Point 42°F5°C
uv Index 3
Barometric Pressure 30.27 in1025 mb
POP 14% *
Humidity 60%
Sun, 20th
Ottawa IL Weather - Sunday, Sep 20, 2026 - Sunny
Hi: 61°F 16°C
Lo: 44°F 6°C
Sunrise 06:41 AM
Sunset 06:56 PM
Wind E 7 mph11 km/h
Dew Point 38°F4°C
uv Index 4
Barometric Pressure 30.3 in1026 mb
POP 7% *
Humidity 50%
Mon, 21st
Ottawa IL Weather - Monday, Sep 21, 2026 - Sunny
Hi: 68°F 20°C
Lo: 47°F 8°C
Sunrise 06:42 AM
Sunset 06:54 PM
Wind S 3 mph5 km/h
Dew Point 42°F6°C
uv Index 5
Barometric Pressure 30.27 in1025 mb
POP 2% *
Humidity 48%
* POP = Probability of Precipitation. Data for 12:00 PM.