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Current weather in Ottawa is overcast clouds.

Where can I find the hourly weather forecast for Ottawa?

This page shows hourly weather forecast for Ottawa, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for Ottawa updated regularly?

Weather data for Ottawa is updated regularly with the latest available observations and forecasts.

Now · 2:16 PM

Ottawa Weather & Hourly Forecast

United States · Illinois · 61350

93°F

Overcast

Feels like: 105°F

💧 Humidity 62% 🌡 Pressure 29.94 inHg 💨 Wind 7 mph 👁 Visibility 6.2 mi ☁ Clouds 98% ☀️ UV index 7.1 · High 🌅 Sunrise 6:21 AM 🌇 Sunset 7:29 PM

Hourly Forecast for Ottawa

Today

3:00 PM

Overcast

93° 💧 None 💨 7 mph H 62%29.94 inHg

6:00 PM

Overcast

89° 💧 None 💨 3 mph H 70%29.88 inHg

9:00 PM

Clear night

81° 💧 None 💨 6 mph H 77%29.91 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 8 mph H 72%29.91 inHg

3:00 AM

Clear night

80° 💧 None 💨 8 mph H 64%29.88 inHg

6:00 AM

Clear night

77° 💧 None 💨 8 mph H 65%29.91 inHg

9:00 AM

Mostly cloudy

81° 💧 None 💨 8 mph H 77%29.94 inHg

12:00 PM

Mostly cloudy

88° 💧 None 💨 11 mph H 67%29.91 inHg

3:00 PM

Sunny

91° 💧 None 💨 9 mph H 66%29.88 inHg

6:00 PM

Sunny

90° 💧 None 💨 3 mph H 74%29.85 inHg

9:00 PM

Partly cloudy night

82° 💧 None 💨 15 mph H 63%29.88 inHg

Thursday

12:00 AM

Partly cloudy night

81° 💧 None 💨 13 mph H 56%29.85 inHg

3:00 AM

Overcast night

80° 💧 0.01 in 💨 5 mph H 65%29.85 inHg

6:00 AM

Light rain

76° 💧 0.00 in 💨 7 mph H 80%29.88 inHg

9:00 AM

Light rain

77° 💧 0.01 in 💨 4 mph H 82%29.91 inHg

12:00 PM

Partly cloudy

86° 💧 None 💨 3 mph H 62%29.94 inHg

Today

3:00 PM

Overcast

93° 💧 None 💨 7 mph H 62%29.94 inHg

4:00 PM

Overcast

92° 💧 None 💨 6 mph H 63%29.94 inHg

5:00 PM

Overcast

91° 💧 None 💨 6 mph H 66%29.91 inHg

6:00 PM

Overcast

89° 💧 None 💨 3 mph H 70%29.88 inHg

7:00 PM

Mostly cloudy

86° 💧 None 💨 3 mph H 74%29.88 inHg

8:00 PM

Clear night

83° 💧 None 💨 6 mph H 78%29.91 inHg

9:00 PM

Clear night

81° 💧 None 💨 6 mph H 77%29.91 inHg

10:00 PM

Clear night

80° 💧 None 💨 7 mph H 75%29.91 inHg

11:00 PM

Clear night

80° 💧 None 💨 8 mph H 74%29.91 inHg

Tomorrow

12:00 AM

Clear night

79° 💧 None 💨 8 mph H 72%29.91 inHg

1:00 AM

Clear night

80° 💧 None 💨 8 mph H 68%29.91 inHg

2:00 AM

Clear night

80° 💧 None 💨 8 mph H 64%29.88 inHg

3:00 AM

Clear night

80° 💧 None 💨 8 mph H 64%29.88 inHg

4:00 AM

Clear night

79° 💧 None 💨 8 mph H 65%29.91 inHg

5:00 AM

Clear night

78° 💧 None 💨 9 mph H 65%29.91 inHg

6:00 AM

Clear night

77° 💧 None 💨 8 mph H 65%29.91 inHg

7:00 AM

Sunny

77° 💧 None 💨 8 mph H 73%29.91 inHg

8:00 AM

Partly cloudy

78° 💧 None 💨 9 mph H 78%29.91 inHg

9:00 AM

Mostly cloudy

81° 💧 None 💨 8 mph H 77%29.94 inHg

10:00 AM

Mostly cloudy

83° 💧 None 💨 10 mph H 72%29.94 inHg

11:00 AM

Mostly cloudy

85° 💧 None 💨 11 mph H 69%29.91 inHg

12:00 PM

Mostly cloudy

88° 💧 None 💨 11 mph H 67%29.91 inHg

1:00 PM

Mostly cloudy

90° 💧 None 💨 11 mph H 64%29.91 inHg

2:00 PM

Sunny

91° 💧 None 💨 11 mph H 64%29.88 inHg

3:00 PM

Sunny

91° 💧 None 💨 9 mph H 66%29.88 inHg

4:00 PM

Sunny

91° 💧 None 💨 7 mph H 68%29.88 inHg

5:00 PM

Sunny

90° 💧 None 💨 5 mph H 70%29.85 inHg

6:00 PM

Sunny

90° 💧 None 💨 3 mph H 74%29.85 inHg

7:00 PM

Mostly sunny

86° 💧 None 💨 8 mph H 78%29.88 inHg

8:00 PM

Mostly clear night

84° 💧 None 💨 12 mph H 71%29.91 inHg

9:00 PM

Partly cloudy night

82° 💧 None 💨 15 mph H 63%29.88 inHg

10:00 PM

Partly cloudy night

80° 💧 None 💨 9 mph H 61%29.88 inHg

11:00 PM

Partly cloudy night

80° 💧 None 💨 11 mph H 55%29.85 inHg

Thursday

12:00 AM

Partly cloudy night

81° 💧 None 💨 13 mph H 56%29.85 inHg

1:00 AM

Mostly cloudy night

79° 💧 None 💨 10 mph H 65%29.85 inHg

2:00 AM

Overcast night

79° 💧 None 💨 6 mph H 69%29.88 inHg

3:00 AM

Overcast night

80° 💧 None 💨 5 mph H 65%29.85 inHg

4:00 AM

Overcast night

79° 💧 None 💨 7 mph H 66%29.88 inHg

5:00 AM

Light rain

76° 💧 0.01 in 💨 6 mph H 77%29.88 inHg

6:00 AM

Light rain

76° 💧 0.00 in 💨 7 mph H 80%29.88 inHg

7:00 AM

Overcast

76° 💧 None 💨 9 mph H 81%29.88 inHg

8:00 AM

Mostly cloudy

75° 💧 None 💨 7 mph H 81%29.88 inHg

9:00 AM

Light rain

77° 💧 0.01 in 💨 4 mph H 82%29.91 inHg

10:00 AM

Mostly cloudy

82° 💧 None 💨 7 mph H 71%29.94 inHg

11:00 AM

Partly cloudy

83° 💧 None 💨 7 mph H 71%29.94 inHg

12:00 PM

Partly cloudy

86° 💧 None 💨 3 mph H 62%29.94 inHg

1:00 PM

Partly cloudy

82° 💧 None 💨 7 mph H 74%29.91 inHg

2:00 PM

Mostly sunny

88° 💧 None 💨 8 mph H 63%29.91 inHg

3:00 PM

Mostly cloudy

86° 💧 None 💨 4 mph H 69%29.91 inHg

4:00 PM

Partly cloudy

87° 💧 None 💨 9 mph H 68%29.91 inHg

5:00 PM

Partly cloudy

84° 💧 None 💨 10 mph H 79%29.91 inHg

6:00 PM

Mostly sunny

82° 💧 None 💨 11 mph H 83%29.88 inHg

7:00 PM

Partly cloudy

79° 💧 None 💨 7 mph H 86%29.88 inHg

8:00 PM

Overcast night

78° 💧 None 💨 6 mph H 83%29.88 inHg

9:00 PM

Partly cloudy night

77° 💧 None 💨 8 mph H 82%29.88 inHg

10:00 PM

Partly cloudy night

76° 💧 None 💨 7 mph H 84%29.88 inHg

11:00 PM

Partly cloudy night

77° 💧 None 💨 8 mph H 82%29.88 inHg

Friday

12:00 AM

Partly cloudy night

78° 💧 None 💨 8 mph H 77%29.88 inHg

1:00 AM

Mostly clear night

77° 💧 None 💨 7 mph H 77%29.88 inHg

2:00 AM

Clear night

77° 💧 None 💨 8 mph H 75%29.85 inHg

3:00 AM

Mostly clear night

77° 💧 None 💨 7 mph H 70%29.85 inHg

4:00 AM

Mostly clear night

77° 💧 None 💨 7 mph H 66%29.85 inHg

5:00 AM

Mostly clear night

76° 💧 None 💨 7 mph H 65%29.85 inHg

6:00 AM

Mostly clear night

74° 💧 None 💨 3 mph H 71%29.85 inHg

7:00 AM

Mostly sunny

72° 💧 None 💨 7 mph H 82%29.91 inHg

8:00 AM

Sunny

75° 💧 None 💨 4 mph H 83%29.94 inHg

9:00 AM

Light rain

79° 💧 0.00 in 💨 4 mph H 75%29.94 inHg

10:00 AM

Mostly sunny

81° 💧 None 💨 6 mph H 75%29.94 inHg

11:00 AM

Mostly sunny

83° 💧 None 💨 6 mph H 71%29.94 inHg

12:00 PM

Partly cloudy

86° 💧 None 💨 7 mph H 66%29.91 inHg

1:00 PM

Partly cloudy

87° 💧 None 💨 8 mph H 64%29.91 inHg

2:00 PM

Overcast

88° 💧 None 💨 9 mph H 63%29.88 inHg

3:00 PM

Mostly cloudy

89° 💧 None 💨 8 mph H 63%29.88 inHg

4:00 PM

Mostly cloudy

89° 💧 None 💨 6 mph H 64%29.88 inHg

5:00 PM

Mostly cloudy

90° 💧 None 💨 4 mph H 67%29.88 inHg

6:00 PM

Mostly cloudy

87° 💧 None 💨 5 mph H 75%29.85 inHg

7:00 PM

Mostly cloudy

82° 💧 None 💨 6 mph H 82%29.88 inHg

8:00 PM

Partly cloudy night

79° 💧 None 💨 7 mph H 85%29.88 inHg

9:00 PM

Partly cloudy night

78° 💧 None 💨 7 mph H 88%29.88 inHg

10:00 PM

Mostly clear night

77° 💧 None 💨 7 mph H 91%29.91 inHg

11:00 PM

Mostly clear night

76° 💧 None 💨 7 mph H 91%29.91 inHg

Saturday

12:00 AM

Mostly clear night

75° 💧 None 💨 7 mph H 90%29.91 inHg

1:00 AM

Mostly clear night

74° 💧 None 💨 7 mph H 89%29.91 inHg

2:00 AM

Mostly clear night

73° 💧 None 💨 6 mph H 91%29.91 inHg

3:00 AM

Clear night

73° 💧 None 💨 6 mph H 94%29.88 inHg

4:00 AM

Mostly clear night

73° 💧 None 💨 6 mph H 95%29.91 inHg

5:00 AM

Mostly clear night

73° 💧 None 💨 6 mph H 95%29.91 inHg

6:00 AM

Mostly clear night

73° 💧 None 💨 6 mph H 95%29.91 inHg

7:00 AM

Mostly sunny

73° 💧 None 💨 6 mph H 95%29.91 inHg

8:00 AM

Mostly cloudy

75° 💧 None 💨 9 mph H 93%29.94 inHg

9:00 AM

Mostly cloudy

78° 💧 None 💨 10 mph H 88%29.97 inHg

10:00 AM

Mostly cloudy

80° 💧 None 💨 14 mph H 86%29.97 inHg

11:00 AM

Overcast

81° 💧 None 💨 13 mph H 82%29.94 inHg

12:00 PM

Overcast

83° 💧 None 💨 12 mph H 77%29.94 inHg

1:00 PM

Mostly cloudy

86° 💧 None 💨 9 mph H 73%29.91 inHg

2:00 PM

Mostly sunny

87° 💧 None 💨 11 mph H 70%29.94 inHg

In Ottawa and, more broadly, across the state of Illinois: The late afternoon and evening will feature clear skies with warm temperatures ranging from 81 to 94 degrees Fahrenheit. Light southeast winds will prevail, generally blowing around 8 mph, with occasional gusts reaching up to 16 mph. No precipitation is expected, so the dry conditions will continue into the night. Temperatures will gradually cool but remain comfortably warm as the evening progresses. It will be a good time to enjoy outdoor activities while staying hydrated, especially with the warm weather sticking around. Overall, it should be a pleasant evening with clear skies and mild breezes.

15-Day Weather Outlook for Ottawa

TomorrowTomorrow

Mostly cloudy 91°/77° 💧 None 💨 15 mph

Thursday, Sep 3Thu Sep 3

Light rain 88°/75° 💧 0.03 in 💨 13 mph

Friday, Sep 4Fri Sep 4

Light rain 89°/72° 💧 0.00 in 💨 8 mph

Saturday, Sep 5Sat Sep 5

Light rain 88°/73° 💧 0.03 in 💨 14 mph

Sunday, Sep 6Sun Sep 6

Light rain 85°/69° 💧 0.05 in 💨 11 mph

Monday, Sep 7Mon Sep 7

Light rain 86°/70° 💧 0.19 in 💨 7 mph

Tuesday, Sep 8Tue Sep 8

Moderate rain 71°/55° 💧 0.22 in 💨 18 mph

Wednesday, Sep 9Wed Sep 9

Moderate rain 55°/50° 💧 0.62 in 💨 16 mph

Thursday, Sep 10Thu Sep 10

Moderate rain 78°/57° 💧 0.47 in 💨 11 mph

Friday, Sep 11Fri Sep 11

Light rain 79°/61° 💧 0.08 in 💨 19 mph

Saturday, Sep 12Sat Sep 12

Mostly cloudy 76°/58° 💧 None 💨 12 mph

Sunday, Sep 13Sun Sep 13

Overcast 64°/59° 💧 None 💨 9 mph

Monday, Sep 14Mon Sep 14

Partly cloudy 70°/56° 💧 None 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Mostly cloudy 71°/57° 💧 None 💨 6 mph

Wednesday, Sep 16Wed Sep 16

Partly cloudy 74°/54° 💧 None 💨 17 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Ottawa

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Ottawa

Hourly forecast · Updated every 2 hours

Moderate

Nearest forecast value 3:00 PM

PM2.5 Fine particles Good 9,3µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 9,8µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Moderate 108,9µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 0,7µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Sensitive people should reduce strenuous and prolonged outdoor exertion.

UV & HEALTH

UV, Sun & Health Outlook in Ottawa

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 7,6High 😐Moderate

Tomorrow UV 7,6High 🙂Fair

Thursday UV 5,6Moderate 🙂Fair

Friday UV 6,1High 🙂Fair

Saturday UV 8,0Very high 🙂Fair

Sunday UV 6,0High —Unavailable

Monday UV 7,0High —Unavailable

Hourly UV index today

3:00 PMUV 5,0 4:00 PMUV 3,2 5:00 PMUV 1,7 6:00 PMUV 0,5 7:00 PMUV 0,0

Today's weather health advice Open today's recommendations.

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Caution for sensitive people

People with respiratory or cardiovascular conditions should reduce prolonged outdoor exertion.

High heat

Stay hydrated and avoid intense exercise during the hottest part of the day.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Ottawa

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

Internal PR simulation: 4.44 Population: 18,447

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Forecast data for Ottawa were last refreshed today at 2:16 PM. The current forecast period extends through 03/09/2026 at 12:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.