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Current weather in Port Jefferson is overcast clouds.

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

Is the weather forecast for Port Jefferson updated regularly?

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

Now · 9:24 PM

Port Jefferson Weather & Hourly Forecast

United States · Ohio · 45360

60°F

Overcast night

Feels like: 54°F

💧 Humidity 84% 🌡 Pressure 30.09 inHg 💨 Wind 13 mph 👁 Visibility 16.1 mi ☁ Clouds 100% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Port Jefferson

Today

10:00 PM

Overcast night

60° 💧 None 💨 13 mph H 85%30.09 inHg

Tomorrow

1:00 AM

Mostly cloudy night

57° 💧 None 💨 10 mph H 90%30.12 inHg

4:00 AM

Mostly cloudy night

56° 💧 0.000 in 💨 9 mph H 93%30.12 inHg

7:00 AM

Overcast night

57° 💧 None 💨 11 mph H 90%30.15 inHg

10:00 AM

Overcast

60° 💧 0.000 in 💨 14 mph H 78%30.18 inHg

1:00 PM

Mostly cloudy

64° 💧 None 💨 13 mph H 72%30.18 inHg

4:00 PM

Overcast

64° 💧 0.010 in 💨 14 mph H 75%30.15 inHg

7:00 PM

Overcast

60° 💧 0.002 in 💨 13 mph H 85%30.18 inHg

10:00 PM

Overcast night

59° 💧 0.008 in 💨 12 mph H 87%30.18 inHg

Wednesday

1:00 AM

Light rain

58° 💧 0.018 in 💨 12 mph H 90%30.21 inHg

4:00 AM

Overcast night

57° 💧 0.002 in 💨 10 mph H 89%30.21 inHg

7:00 AM

Overcast night

57° 💧 0.001 in 💨 10 mph H 85%30.24 inHg

10:00 AM

Overcast

58° 💧 0.005 in 💨 10 mph H 84%30.24 inHg

1:00 PM

Overcast

61° 💧 0.006 in 💨 11 mph H 80%30.27 inHg

4:00 PM

Light rain

63° 💧 0.005 in 💨 9 mph H 78%30.24 inHg

7:00 PM

Overcast

63° 💧 None 💨 9 mph H 76%30.24 inHg

Today

10:00 PM

Overcast night

60° 💧 None 💨 13 mph H 85%30.09 inHg

11:00 PM

Overcast night

58° 💧 None 💨 12 mph H 88%30.12 inHg

Tomorrow

12:00 AM

Overcast night

58° 💧 None 💨 10 mph H 89%30.12 inHg

1:00 AM

Mostly cloudy night

57° 💧 None 💨 10 mph H 90%30.12 inHg

2:00 AM

Partly cloudy night

57° 💧 None 💨 9 mph H 91%30.12 inHg

3:00 AM

Mostly cloudy night

56° 💧 None 💨 10 mph H 92%30.12 inHg

4:00 AM

Mostly cloudy night

56° 💧 None 💨 9 mph H 93%30.12 inHg

5:00 AM

Mostly cloudy night

56° 💧 None 💨 10 mph H 93%30.12 inHg

6:00 AM

Mostly cloudy night

56° 💧 0.000 in 💨 10 mph H 92%30.12 inHg

7:00 AM

Overcast night

57° 💧 None 💨 11 mph H 90%30.15 inHg

8:00 AM

Overcast

57° 💧 None 💨 11 mph H 88%30.15 inHg

9:00 AM

Overcast

59° 💧 None 💨 12 mph H 85%30.18 inHg

10:00 AM

Overcast

60° 💧 0.000 in 💨 14 mph H 78%30.18 inHg

11:00 AM

Mostly cloudy

62° 💧 None 💨 14 mph H 75%30.18 inHg

12:00 PM

Mostly cloudy

63° 💧 None 💨 14 mph H 73%30.18 inHg

1:00 PM

Mostly cloudy

64° 💧 None 💨 13 mph H 72%30.18 inHg

2:00 PM

Overcast

65° 💧 None 💨 13 mph H 72%30.18 inHg

3:00 PM

Overcast

65° 💧 None 💨 14 mph H 72%30.15 inHg

4:00 PM

Overcast

64° 💧 0.000 in 💨 14 mph H 75%30.15 inHg

5:00 PM

Light rain

62° 💧 0.004 in 💨 13 mph H 80%30.15 inHg

6:00 PM

Light rain

61° 💧 0.005 in 💨 13 mph H 83%30.15 inHg

7:00 PM

Overcast

60° 💧 0.001 in 💨 13 mph H 85%30.18 inHg

8:00 PM

Overcast night

59° 💧 0.001 in 💨 13 mph H 86%30.18 inHg

9:00 PM

Overcast night

59° 💧 None 💨 12 mph H 86%30.18 inHg

10:00 PM

Overcast night

59° 💧 0.002 in 💨 12 mph H 87%30.18 inHg

11:00 PM

Overcast night

59° 💧 0.002 in 💨 12 mph H 87%30.21 inHg

Wednesday

12:00 AM

Overcast night

59° 💧 0.004 in 💨 12 mph H 87%30.21 inHg

1:00 AM

Light rain

58° 💧 0.013 in 💨 12 mph H 90%30.21 inHg

2:00 AM

Light rain

58° 💧 0.005 in 💨 11 mph H 91%30.21 inHg

3:00 AM

Overcast night

58° 💧 None 💨 11 mph H 90%30.21 inHg

4:00 AM

Overcast night

57° 💧 None 💨 10 mph H 89%30.21 inHg

5:00 AM

Overcast night

57° 💧 0.001 in 💨 10 mph H 88%30.21 inHg

6:00 AM

Overcast night

57° 💧 0.001 in 💨 10 mph H 86%30.21 inHg

7:00 AM

Overcast night

57° 💧 None 💨 10 mph H 85%30.24 inHg

8:00 AM

Overcast

57° 💧 0.001 in 💨 10 mph H 85%30.24 inHg

9:00 AM

Overcast

57° 💧 0.001 in 💨 9 mph H 86%30.24 inHg

10:00 AM

Overcast

58° 💧 0.001 in 💨 10 mph H 84%30.24 inHg

11:00 AM

Overcast

59° 💧 0.002 in 💨 11 mph H 83%30.27 inHg

12:00 PM

Overcast

60° 💧 0.002 in 💨 11 mph H 81%30.27 inHg

1:00 PM

Overcast

61° 💧 0.002 in 💨 11 mph H 80%30.27 inHg

2:00 PM

Overcast

62° 💧 0.001 in 💨 10 mph H 77%30.27 inHg

3:00 PM

Overcast

63° 💧 0.003 in 💨 9 mph H 77%30.24 inHg

4:00 PM

Light rain

63° 💧 0.004 in 💨 9 mph H 78%30.24 inHg

5:00 PM

Overcast

64° 💧 0.001 in 💨 10 mph H 75%30.24 inHg

6:00 PM

Overcast

64° 💧 None 💨 10 mph H 74%30.24 inHg

7:00 PM

Overcast

63° 💧 None 💨 9 mph H 76%30.24 inHg

8:00 PM

Overcast night

62° 💧 None 💨 8 mph H 78%30.24 inHg

9:00 PM

Overcast night

62° 💧 None 💨 8 mph H 79%30.27 inHg

10:00 PM

Overcast night

62° 💧 None 💨 8 mph H 79%30.27 inHg

11:00 PM

Overcast night

62° 💧 None 💨 10 mph H 78%30.27 inHg

Thursday

12:00 AM

Mostly clear night

61° 💧 None 💨 9 mph H 74%30.27 inHg

1:00 AM

Mostly clear night

59° 💧 None 💨 8 mph H 76%30.27 inHg

2:00 AM

Overcast night

58° 💧 None 💨 7 mph H 77%30.27 inHg

3:00 AM

Overcast night

58° 💧 None 💨 7 mph H 76%30.27 inHg

4:00 AM

Overcast night

58° 💧 None 💨 7 mph H 78%30.27 inHg

5:00 AM

Overcast night

58° 💧 None 💨 7 mph H 79%30.27 inHg

6:00 AM

Overcast night

57° 💧 None 💨 7 mph H 81%30.27 inHg

7:00 AM

Mostly cloudy night

57° 💧 None 💨 7 mph H 82%30.27 inHg

8:00 AM

Partly cloudy

57° 💧 None 💨 8 mph H 84%30.27 inHg

5:00 PM

Overcast

65° 💧 None 💨 7 mph H 70%30.24 inHg

8:00 PM

Mostly clear night

60° 💧 None 💨 5 mph H 83%30.24 inHg

11:00 PM

Mostly cloudy night

55° 💧 None 💨 7 mph H 81%30.27 inHg

Friday

2:00 AM

Clear night

51° 💧 None 💨 6 mph H 86%30.27 inHg

5:00 AM

Clear night

48° 💧 None 💨 4 mph H 91%30.27 inHg

8:00 AM

Sunny

48° 💧 None 💨 6 mph H 89%30.30 inHg

11:00 AM

Sunny

59° 💧 None 💨 6 mph H 63%30.33 inHg

2:00 PM

Sunny

65° 💧 None 💨 8 mph H 52%30.27 inHg

5:00 PM

Sunny

65° 💧 None 💨 8 mph H 55%30.24 inHg

8:00 PM

Clear night

57° 💧 None 💨 6 mph H 77%30.24 inHg

11:00 PM

Clear night

51° 💧 None 💨 6 mph H 87%30.27 inHg

Saturday

2:00 AM

Clear night

49° 💧 None 💨 6 mph H 94%30.24 inHg

5:00 AM

Clear night

48° 💧 None 💨 5 mph H 93%30.24 inHg

8:00 AM

Sunny

48° 💧 None 💨 4 mph H 95%30.24 inHg

11:00 AM

Sunny

60° 💧 None 💨 7 mph H 71%30.24 inHg

2:00 PM

Sunny

66° 💧 None 💨 6 mph H 58%30.18 inHg

5:00 PM

Sunny

67° 💧 None 💨 7 mph H 60%30.12 inHg

8:00 PM

Clear night

58° 💧 None 💨 5 mph H 83%30.12 inHg

11:00 PM

Clear night

54° 💧 None 💨 6 mph H 89%30.12 inHg

Sunday

2:00 AM

Clear night

50° 💧 None 💨 4 mph H 92%30.09 inHg

5:00 AM

Clear night

48° 💧 None 💨 2 mph H 94%30.09 inHg

8:00 AM

Sunny

48° 💧 None 💨 5 mph H 95%30.09 inHg

11:00 AM

Sunny

62° 💧 None 💨 6 mph H 74%30.06 inHg

2:00 PM

Sunny

67° 💧 None 💨 6 mph H 56%30.03 inHg

8:00 PM

Clear night

67° 💧 None 💨 8 mph H 58%30.03 inHg

Monday

2:00 AM

Clear night

59° 💧 None 💨 5 mph H 81%30.00 inHg

8:00 AM

Sunny

52° 💧 None 💨 1 mph H 82%30.00 inHg

2:00 PM

Sunny

47° 💧 None 💨 3 mph H 98%30.03 inHg

8:00 PM

Mostly clear night

67° 💧 None 💨 6 mph H 56%30.00 inHg

Tuesday

2:00 AM

Clear night

58° 💧 None 💨 4 mph H 78%30.00 inHg

8:00 AM

Sunny

51° 💧 None 💨 4 mph H 92%30.00 inHg

2:00 PM

Sunny

49° 💧 None 💨 2 mph H 94%30.03 inHg

8:00 PM

Clear night

71° 💧 None 💨 4 mph H 60%30.00 inHg

Wednesday

2:00 AM

Clear night

64° 💧 None 💨 6 mph H 79%29.94 inHg

8:00 AM

Sunny

59° 💧 None 💨 6 mph H 89%29.97 inHg

2:00 PM

Sunny

56° 💧 None 💨 6 mph H 94%30.00 inHg

8:00 PM

Partly cloudy night

76° 💧 None 💨 7 mph H 50%29.97 inHg

Thursday

2:00 AM

Overcast night

68° 💧 None 💨 7 mph H 73%30.00 inHg

8:00 AM

Mostly cloudy

63° 💧 None 💨 8 mph H 76%30.03 inHg

2:00 PM

Mostly cloudy

61° 💧 None 💨 8 mph H 76%30.09 inHg

8:00 PM

Mostly clear night

79° 💧 None 💨 6 mph H 54%30.09 inHg

Friday

2:00 AM

Clear night

70° 💧 None 💨 8 mph H 72%30.06 inHg

8:00 AM

Sunny

66° 💧 None 💨 9 mph H 73%30.06 inHg

2:00 PM

Partly cloudy

64° 💧 None 💨 9 mph H 63%30.03 inHg

8:00 PM

Overcast night

76° 💧 None 💨 7 mph H 59%30.00 inHg

Saturday

2:00 AM

Light rain

69° 💧 None 💨 2 mph H 91%30.00 inHg

8:00 AM

Overcast

67° 💧 None 💨 2 mph H 95%29.97 inHg

2:00 PM

Light rain

66° 💧 None 💨 7 mph H 86%29.94 inHg

8:00 PM

Light rain

70° 💧 None 💨 11 mph H 83%29.85 inHg

Sunday

2:00 AM

Overcast night

71° 💧 None 💨 16 mph H 81%29.80 inHg

8:00 AM

Moderate rain

67° 💧 None 💨 12 mph H 98%29.77 inHg

2:00 PM

Overcast

66° 💧 None 💨 9 mph H 98%29.77 inHg

8:00 PM

Clear night

69° 💧 None 💨 17 mph H 50%29.77 inHg

Monday

2:00 AM

Mostly clear night

61° 💧 None 💨 9 mph H 64%29.85 inHg

8:00 AM

Sunny

56° 💧 None 💨 7 mph H 83%29.88 inHg

2:00 PM

Sunny

52° 💧 None 💨 5 mph H 97%29.97 inHg

8:00 PM

Partly cloudy night

66° 💧 None 💨 10 mph H 54%29.97 inHg

Tuesday

2:00 AM

Clear night

57° 💧 None 💨 4 mph H 73%29.97 inHg

8:00 AM

Sunny

51° 💧 None 💨 1 mph H 84%30.03 inHg

2:00 PM

Sunny

49° 💧 None 💨 3 mph H 86%30.03 inHg

In Port Jefferson and, more broadly, across the state of Ohio: The evening will feature mostly cloudy skies with temperatures holding steady around 56 degrees. Some light rain may occur, with an accumulation of about 0.01 inches, though the chance of rain remains low. Winds will be from the northeast, reaching up to 12 mph, with gusts up to 21 mph. Conditions are generally cool and breezy for the next few hours, so it might be a good idea to have an umbrella or raincoat handy if you plan to be outdoors. Temperatures are expected to remain steady through the evening, and any rainfall should be brief and light.

15-Day Weather Outlook for Port Jefferson

TomorrowTomorrow

Overcast 65°/56° 💧 None 💨 14 mph

Wednesday, Sep 23Wed Sep 23

Overcast 64°/57° 💧 None 💨 12 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 65°/55° 💧 0.053 in 💨 9 mph

Friday, Sep 25Fri Sep 25

Sunny 65°/48° 💧 None 💨 8 mph

Saturday, Sep 26Sat Sep 26

Sunny 67°/48° 💧 None 💨 7 mph

Sunday, Sep 27Sun Sep 27

Sunny 67°/48° 💧 0.130 in 💨 8 mph

Monday, Sep 28Mon Sep 28

Mostly sunny 67°/47° 💧 None 💨 6 mph

Tuesday, Sep 29Tue Sep 29

Sunny 71°/49° 💧 None 💨 4 mph

Wednesday, Sep 30Wed Sep 30

Partly cloudy 76°/56° 💧 None 💨 7 mph

Thursday, Oct 1Thu Oct 1

Overcast 79°/61° 💧 None 💨 8 mph

Friday, Oct 2Fri Oct 2

Partly cloudy 76°/64° 💧 None 💨 9 mph

Saturday, Oct 3Sat Oct 3

Light rain 70°/66° 💧 0.219 in 💨 11 mph

Sunday, Oct 4Sun Oct 4

Moderate rain 71°/66° 💧 0.388 in 💨 17 mph

Monday, Oct 5Mon Oct 5

Mostly sunny 66°/52° 💧 None 💨 10 mph

Tuesday, Oct 6Tue Oct 6

Sunny 57°/49° 💧 None 💨 4 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Port Jefferson

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Port Jefferson

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 10:00 PM

PM2.5 Fine particles Good 2,7µg/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 3,2µg/m³

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

O₃ Ozone Good 53,0µg/m³

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

NO₂ Nitrogen dioxide Good 7,1µg/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 Port Jefferson

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 1,2Low 😊Good

Tomorrow UV 4,4Moderate 🙂Fair

Wednesday UV 1,4Low 😊Good

Thursday UV 5,7Moderate 🙂Fair

Friday UV 5,7Moderate 😐Moderate

Saturday UV 4,0Moderate —Unavailable

Sunday UV 4,0Moderate —Unavailable

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

Low UV risk

UV radiation will be low, although basic protection is still advisable during prolonged exposure.

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 Port Jefferson

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · PORT JEFFERSON, OHIO

Tonight's Stargazing & Shooting Stars

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

66/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 9:06 PM–5:52 AM

☁ Cloud cover 41% Real hourly forecast for the best viewing hour.

☾ Moonlight 80% Waxing Gibbous · Moon about 9° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 59° high at the best hour.

✦ Estimated visible meteors 0–2/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min41%

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

ACTIVE NOW

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.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for Port Jefferson were last refreshed today at 9:24 PM. The current forecast period extends through 23/09/2026 at 7:00 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.