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Current weather in Janesville is clear sky.

Where can I find the hourly weather forecast for Janesville?

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

Is the weather forecast for Janesville updated regularly?

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

Now · 8:25 AM

Janesville Weather & Hourly Forecast

United States · Illinois · 62440

72°F

Sunny

Feels like: 78°F

💧 Humidity 94% 🌡 Pressure 29.91 inHg 💨 Wind 3 mph 👁 Visibility 9.5 mi ☁ Clouds 5% ☀️ UV index 0.5 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Janesville

Today

9:00 AM

Sunny

76° 💧 0.003 in 💨 3 mph H 85%29.91 inHg

12:00 PM

Sunny

84° 💧 0.000 in 💨 5 mph H 56%29.88 inHg

3:00 PM

Overcast

88° 💧 None 💨 7 mph H 45%29.85 inHg

6:00 PM

Sunny

84° 💧 None 💨 6 mph H 54%29.85 inHg

9:00 PM

Clear night

77° 💧 None 💨 5 mph H 72%29.91 inHg

Tomorrow

12:00 AM

Mostly cloudy night

73° 💧 None 💨 4 mph H 85%29.94 inHg

3:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 90%29.94 inHg

6:00 AM

Mostly clear night

70° 💧 None 💨 2 mph H 93%29.97 inHg

9:00 AM

Partly cloudy

79° 💧 0.000 in 💨 2 mph H 75%30.00 inHg

12:00 PM

Strong thunderstorm

87° 💧 0.020 in 💨 6 mph H 56%29.97 inHg

3:00 PM

Thunderstorms

75° 💧 0.149 in 💨 11 mph H 90%30.00 inHg

6:00 PM

Mostly sunny

75° 💧 0.001 in 💨 10 mph H 67%30.00 inHg

9:00 PM

Mostly cloudy night

71° 💧 0.007 in 💨 6 mph H 70%30.06 inHg

Monday

12:00 AM

Partly cloudy night

67° 💧 0.001 in 💨 8 mph H 72%30.09 inHg

3:00 AM

Partly cloudy night

64° 💧 None 💨 10 mph H 66%30.15 inHg

6:00 AM

Mostly cloudy night

63° 💧 None 💨 9 mph H 69%30.18 inHg

Today

9:00 AM

Sunny

76° 💧 None 💨 3 mph H 85%29.91 inHg

10:00 AM

Mostly sunny

79° 💧 0.001 in 💨 4 mph H 72%29.88 inHg

11:00 AM

Sunny

82° 💧 0.002 in 💨 5 mph H 63%29.91 inHg

12:00 PM

Sunny

84° 💧 0.000 in 💨 5 mph H 56%29.88 inHg

1:00 PM

Partly cloudy

86° 💧 None 💨 6 mph H 49%29.88 inHg

2:00 PM

Sunny

87° 💧 None 💨 7 mph H 45%29.88 inHg

3:00 PM

Overcast

88° 💧 None 💨 7 mph H 45%29.85 inHg

4:00 PM

Mostly sunny

87° 💧 None 💨 8 mph H 47%29.85 inHg

5:00 PM

Sunny

86° 💧 None 💨 7 mph H 48%29.85 inHg

6:00 PM

Sunny

84° 💧 None 💨 6 mph H 54%29.85 inHg

7:00 PM

Sunny

79° 💧 None 💨 5 mph H 64%29.85 inHg

8:00 PM

Clear night

77° 💧 None 💨 5 mph H 69%29.88 inHg

9:00 PM

Clear night

77° 💧 None 💨 5 mph H 72%29.91 inHg

10:00 PM

Mostly clear night

75° 💧 None 💨 4 mph H 77%29.94 inHg

11:00 PM

Mostly clear night

74° 💧 None 💨 3 mph H 80%29.94 inHg

Tomorrow

12:00 AM

Mostly cloudy night

73° 💧 None 💨 4 mph H 85%29.94 inHg

1:00 AM

Clear night

72° 💧 None 💨 3 mph H 87%29.94 inHg

2:00 AM

Clear night

71° 💧 None 💨 4 mph H 89%29.94 inHg

3:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 90%29.94 inHg

4:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 90%29.94 inHg

5:00 AM

Clear night

70° 💧 None 💨 3 mph H 92%29.97 inHg

6:00 AM

Mostly clear night

70° 💧 None 💨 2 mph H 93%29.97 inHg

7:00 AM

Mostly sunny

70° 💧 None 💨 2 mph H 93%30.00 inHg

8:00 AM

Mostly sunny

74° 💧 None 💨 2 mph H 84%30.00 inHg

9:00 AM

Partly cloudy

79° 💧 0.000 in 💨 2 mph H 75%30.00 inHg

10:00 AM

Mostly cloudy

82° 💧 0.000 in 💨 2 mph H 67%30.00 inHg

11:00 AM

Mostly cloudy

85° 💧 None 💨 5 mph H 59%30.00 inHg

12:00 PM

Strong thunderstorm

87° 💧 0.002 in 💨 6 mph H 56%29.97 inHg

1:00 PM

Strong thunderstorm

89° 💧 None 💨 7 mph H 53%29.97 inHg

2:00 PM

Light thunderstorms

82° 💧 0.018 in 💨 11 mph H 70%29.97 inHg

3:00 PM

Thunderstorms

75° 💧 0.129 in 💨 11 mph H 90%30.00 inHg

4:00 PM

Light rain

77° 💧 0.018 in 💨 10 mph H 82%30.00 inHg

5:00 PM

Overcast

77° 💧 0.002 in 💨 11 mph H 68%30.00 inHg

6:00 PM

Mostly sunny

75° 💧 None 💨 10 mph H 67%30.00 inHg

7:00 PM

Partly cloudy

73° 💧 None 💨 6 mph H 70%30.03 inHg

8:00 PM

Partly cloudy night

72° 💧 0.001 in 💨 6 mph H 71%30.03 inHg

9:00 PM

Mostly cloudy night

71° 💧 None 💨 6 mph H 70%30.06 inHg

10:00 PM

Partly cloudy night

70° 💧 0.003 in 💨 9 mph H 62%30.09 inHg

11:00 PM

Partly cloudy night

67° 💧 0.003 in 💨 8 mph H 68%30.09 inHg

Monday

12:00 AM

Partly cloudy night

67° 💧 0.001 in 💨 8 mph H 72%30.09 inHg

1:00 AM

Partly cloudy night

67° 💧 None 💨 9 mph H 67%30.12 inHg

2:00 AM

Partly cloudy night

65° 💧 None 💨 9 mph H 64%30.12 inHg

3:00 AM

Partly cloudy night

64° 💧 None 💨 10 mph H 66%30.15 inHg

4:00 AM

Mostly cloudy night

63° 💧 None 💨 10 mph H 67%30.15 inHg

5:00 AM

Overcast night

63° 💧 None 💨 10 mph H 68%30.18 inHg

6:00 AM

Mostly cloudy night

63° 💧 None 💨 9 mph H 69%30.18 inHg

7:00 AM

Mostly cloudy

62° 💧 None 💨 9 mph H 69%30.18 inHg

8:00 AM

Partly cloudy

63° 💧 None 💨 9 mph H 66%30.21 inHg

9:00 AM

Mostly cloudy

65° 💧 None 💨 10 mph H 61%30.21 inHg

10:00 AM

Overcast

67° 💧 None 💨 9 mph H 56%30.21 inHg

11:00 AM

Mostly cloudy

70° 💧 None 💨 10 mph H 50%30.21 inHg

12:00 PM

Overcast

72° 💧 None 💨 10 mph H 46%30.18 inHg

1:00 PM

Mostly cloudy

74° 💧 None 💨 10 mph H 44%30.15 inHg

2:00 PM

Mostly cloudy

77° 💧 None 💨 10 mph H 41%30.12 inHg

3:00 PM

Mostly cloudy

77° 💧 None 💨 9 mph H 42%30.12 inHg

4:00 PM

Mostly sunny

78° 💧 None 💨 9 mph H 44%30.09 inHg

5:00 PM

Sunny

78° 💧 None 💨 9 mph H 45%30.09 inHg

6:00 PM

Sunny

76° 💧 None 💨 9 mph H 50%30.06 inHg

7:00 PM

Sunny

74° 💧 None 💨 8 mph H 55%30.06 inHg

Tuesday

4:00 AM

Clear night

70° 💧 None 💨 11 mph H 80%30.03 inHg

7:00 AM

Sunny

71° 💧 None 💨 10 mph H 87%30.09 inHg

10:00 AM

Sunny

83° 💧 None 💨 11 mph H 68%30.09 inHg

1:00 PM

Mostly sunny

93° 💧 None 💨 11 mph H 43%30.06 inHg

4:00 PM

Sunny

94° 💧 None 💨 10 mph H 39%30.03 inHg

7:00 PM

Mostly sunny

85° 💧 None 💨 4 mph H 52%30.03 inHg

10:00 PM

Clear night

79° 💧 None 💨 3 mph H 66%30.12 inHg

Wednesday

1:00 AM

Clear night

73° 💧 None 💨 1 mph H 85%30.12 inHg

4:00 AM

Mostly clear night

73° 💧 None 💨 4 mph H 81%30.15 inHg

7:00 AM

Mostly sunny

72° 💧 None 💨 4 mph H 89%30.18 inHg

10:00 AM

Mostly sunny

86° 💧 None 💨 3 mph H 60%30.21 inHg

1:00 PM

Sunny

95° 💧 None 💨 8 mph H 36%30.18 inHg

4:00 PM

Mostly sunny

96° 💧 None 💨 8 mph H 32%30.12 inHg

7:00 PM

Sunny

87° 💧 None 💨 3 mph H 48%30.12 inHg

10:00 PM

Clear night

82° 💧 None 💨 8 mph H 59%30.15 inHg

Thursday

1:00 AM

Clear night

79° 💧 None 💨 6 mph H 63%30.18 inHg

4:00 AM

Overcast night

76° 💧 None 💨 5 mph H 72%30.15 inHg

7:00 AM

Partly cloudy

76° 💧 None 💨 6 mph H 75%30.18 inHg

10:00 AM

Partly cloudy

85° 💧 None 💨 6 mph H 58%30.21 inHg

1:00 PM

Mostly sunny

92° 💧 None 💨 6 mph H 43%30.15 inHg

4:00 PM

Light rain

92° 💧 None 💨 6 mph H 43%30.09 inHg

7:00 PM

Mostly clear night

84° 💧 None 💨 5 mph H 65%30.12 inHg

10:00 PM

Partly cloudy night

79° 💧 None 💨 6 mph H 79%30.15 inHg

Friday

1:00 AM

Clear night

74° 💧 None 💨 3 mph H 92%30.15 inHg

7:00 AM

Sunny

79° 💧 None 💨 5 mph H 70%30.12 inHg

1:00 PM

Sunny

75° 💧 None 💨 5 mph H 80%30.12 inHg

7:00 PM

Clear night

94° 💧 None 💨 9 mph H 35%30.06 inHg

Saturday

1:00 AM

Clear night

86° 💧 None 💨 3 mph H 48%29.94 inHg

7:00 AM

Sunny

79° 💧 None 💨 9 mph H 60%29.94 inHg

1:00 PM

Sunny

75° 💧 None 💨 8 mph H 58%29.91 inHg

7:00 PM

Mostly cloudy night

92° 💧 None 💨 9 mph H 34%29.85 inHg

Sunday

1:00 AM

Overcast night

78° 💧 None 💨 12 mph H 66%29.85 inHg

7:00 AM

Mostly cloudy

69° 💧 None 💨 9 mph H 80%29.91 inHg

1:00 PM

Overcast

65° 💧 None 💨 11 mph H 79%29.97 inHg

7:00 PM

Mostly clear night

77° 💧 None 💨 12 mph H 44%30.03 inHg

Monday

1:00 AM

Mostly cloudy night

70° 💧 None 💨 13 mph H 45%30.03 inHg

7:00 AM

Sunny

58° 💧 None 💨 10 mph H 74%30.12 inHg

1:00 PM

Sunny

55° 💧 None 💨 8 mph H 82%30.12 inHg

7:00 PM

Clear night

71° 💧 None 💨 8 mph H 33%30.09 inHg

Tuesday

1:00 AM

Clear night

67° 💧 None 💨 6 mph H 41%30.00 inHg

7:00 AM

Overcast

59° 💧 None 💨 4 mph H 59%30.03 inHg

1:00 PM

Mostly cloudy

56° 💧 None 💨 4 mph H 74%30.06 inHg

7:00 PM

Clear night

75° 💧 None 💨 7 mph H 34%30.06 inHg

Wednesday

1:00 AM

Clear night

69° 💧 None 💨 4 mph H 41%30.03 inHg

7:00 AM

Sunny

60° 💧 None 💨 5 mph H 57%30.06 inHg

1:00 PM

Sunny

56° 💧 None 💨 6 mph H 67%30.12 inHg

7:00 PM

Clear night

80° 💧 None 💨 5 mph H 44%30.12 inHg

Thursday

1:00 AM

Clear night

75° 💧 None 💨 5 mph H 44%30.09 inHg

7:00 AM

Sunny

66° 💧 None 💨 5 mph H 61%30.15 inHg

1:00 PM

Sunny

59° 💧 None 💨 4 mph H 80%30.21 inHg

7:00 PM

Clear night

82° 💧 None 💨 8 mph H 37%30.18 inHg

Friday

1:00 AM

Clear night

76° 💧 None 💨 5 mph H 40%30.15 inHg

7:00 AM

Sunny

66° 💧 None 💨 4 mph H 59%30.18 inHg

1:00 PM

Sunny

59° 💧 None 💨 4 mph H 74%30.24 inHg

7:00 PM

Clear night

82° 💧 None 💨 7 mph H 33%30.18 inHg

Saturday

1:00 AM

Clear night

76° 💧 None 💨 5 mph H 39%30.12 inHg

7:00 AM

Sunny

66° 💧 None 💨 5 mph H 59%30.15 inHg

1:00 PM

Sunny

60° 💧 None 💨 4 mph H 87%30.12 inHg

7:00 PM

Clear night

81° 💧 None 💨 6 mph H 37%30.06 inHg

Sunday

1:00 AM

Clear night

77° 💧 None 💨 7 mph H 37%29.97 inHg

In Janesville and, more broadly, across the state of Illinois: This morning will start with mostly sunny skies and a few clouds, creating warm and comfortable conditions. Temperatures are expected to rise quickly, with highs reaching around 88 degrees. Winds will be light from the north, blowing at up to 7 mph, with occasional gusts reaching 11 mph. As the afternoon progresses, the weather will remain mostly clear, with plenty of sunshine and no precipitation expected. Temperatures will stay warm, maintaining the hot conditions of the day. Overall, it will be a bright and warm day with gentle breezes, making it suitable for outdoor activities. No significant weather changes are anticipated throughout the day.

15-Day Weather Outlook for Janesville

TomorrowTomorrow

Strong thunderstorm 89°/70° 💧 None 💨 11 mph

Monday, Sep 14Mon Sep 14

Partly cloudy 78°/62° 💧 None 💨 10 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 94°/70° 💧 0.120 in 💨 11 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 96°/72° 💧 0.001 in 💨 8 mph

Thursday, Sep 17Thu Sep 17

Overcast 92°/76° 💧 0.001 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Mostly sunny 84°/74° 💧 0.138 in 💨 6 mph

Saturday, Sep 19Sat Sep 19

Sunny 94°/75° 💧 None 💨 9 mph

Sunday, Sep 20Sun Sep 20

Mostly cloudy 92°/65° 💧 0.037 in 💨 12 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 77°/55° 💧 None 💨 13 mph

Tuesday, Sep 22Tue Sep 22

Overcast 71°/56° 💧 None 💨 8 mph

Wednesday, Sep 23Wed Sep 23

Sunny 75°/56° 💧 None 💨 7 mph

Thursday, Sep 24Thu Sep 24

Sunny 80°/59° 💧 None 💨 5 mph

Friday, Sep 25Fri Sep 25

Sunny 82°/59° 💧 None 💨 8 mph

Saturday, Sep 26Sat Sep 26

Sunny 82°/60° 💧 None 💨 7 mph

Sunday, Sep 27Sun Sep 27

Sunny 81°/77° 💧 None 💨 7 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Janesville

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Janesville

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 9:00 AM

PM2.5 Fine particles Good 6,1µg/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 6,8µg/m³

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

O₃ Ozone Good 19,3µg/m³

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

NO₂ Nitrogen dioxide Good 2,8µg/m³

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

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in Janesville

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 7,4High 😊Good

Tomorrow UV 6,9High 🙂Fair

Monday UV 7,2High 😐Moderate

Tuesday UV 9,0Very high 😐Moderate

Wednesday UV 9,0Very high 😊Good

Thursday UV 9,0Very high —Unavailable

Friday UV 8,0Very high —Unavailable

Hourly UV index today

9:00 AMUV 1,6 10:00 AMUV 3,3 11:00 AMUV 5,3 12:00 PMUV 6,9 1:00 PMUV 7,4 2:00 PMUV 6,7 3:00 PMUV 5,0 4:00 PMUV 3,0 5:00 PMUV 1,4 6:00 PMUV 0,4 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.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Janesville

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · JANESVILLE, ILLINOIS

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

98/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 8:38 PM–5:01 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 2% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 60° high at the best hour.

✦ Estimated visible meteors 2–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min76%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

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Forecast data for Janesville were last refreshed today at 8:25 AM. The current forecast period extends through 14/09/2026 at 6:00 AM. 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.