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Current weather in Fullerton is broken clouds.

Where can I find the hourly weather forecast for Fullerton?

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

Is the weather forecast for Fullerton updated regularly?

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

Now · 3:40 PM

Fullerton Weather & Hourly Forecast

United States · Pennsylvania · 18052

85°F

Mostly cloudy

Feels like: 84°F

💧 Humidity 45% 🌡 Pressure 29.85 inHg 💨 Wind 9 mph 👁 Visibility 27.2 mi ☁ Clouds 85% ☀️ UV index 5.1 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Fullerton

Today

4:00 PM

Mostly cloudy

85° 💧 None 💨 9 mph H 45%29.85 inHg

7:00 PM

Mostly cloudy

80° 💧 None 💨 3 mph H 63%29.85 inHg

10:00 PM

Mostly cloudy night

74° 💧 None 💨 3 mph H 77%29.88 inHg

Tomorrow

1:00 AM

Overcast night

72° 💧 None 💨 4 mph H 72%29.91 inHg

4:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 74%29.94 inHg

7:00 AM

Overcast

64° 💧 None 💨 4 mph H 79%29.97 inHg

10:00 AM

Partly cloudy

70° 💧 None 💨 3 mph H 60%30.03 inHg

1:00 PM

Sunny

78° 💧 None 💨 5 mph H 44%30.00 inHg

4:00 PM

Sunny

80° 💧 None 💨 5 mph H 40%29.97 inHg

7:00 PM

Sunny

75° 💧 None 💨 4 mph H 52%29.97 inHg

10:00 PM

Mostly cloudy night

66° 💧 None 💨 3 mph H 65%30.03 inHg

Saturday

1:00 AM

Mostly cloudy night

62° 💧 None 💨 3 mph H 74%30.06 inHg

4:00 AM

Overcast night

60° 💧 None 💨 4 mph H 83%30.06 inHg

7:00 AM

Overcast

59° 💧 None 💨 4 mph H 83%30.09 inHg

10:00 AM

Mostly cloudy

71° 💧 None 💨 5 mph H 63%30.09 inHg

1:00 PM

Light rain

73° 💧 0.530 in 💨 7 mph H 78%30.09 inHg

Today

4:00 PM

Mostly cloudy

85° 💧 None 💨 9 mph H 45%29.85 inHg

5:00 PM

Partly cloudy

84° 💧 None 💨 8 mph H 48%29.83 inHg

6:00 PM

Mostly sunny

83° 💧 None 💨 7 mph H 52%29.83 inHg

7:00 PM

Mostly cloudy

80° 💧 None 💨 3 mph H 63%29.85 inHg

8:00 PM

Mostly clear night

78° 💧 None 💨 3 mph H 67%29.85 inHg

9:00 PM

Partly cloudy night

76° 💧 None 💨 3 mph H 74%29.88 inHg

10:00 PM

Mostly cloudy night

74° 💧 None 💨 3 mph H 77%29.88 inHg

11:00 PM

Partly cloudy night

73° 💧 None 💨 5 mph H 77%29.91 inHg

Tomorrow

12:00 AM

Overcast night

72° 💧 None 💨 4 mph H 76%29.91 inHg

1:00 AM

Overcast night

72° 💧 None 💨 4 mph H 72%29.91 inHg

2:00 AM

Overcast night

72° 💧 None 💨 5 mph H 72%29.91 inHg

3:00 AM

Overcast night

71° 💧 None 💨 5 mph H 74%29.94 inHg

4:00 AM

Mostly clear night

69° 💧 None 💨 5 mph H 74%29.94 inHg

5:00 AM

Mostly clear night

67° 💧 None 💨 4 mph H 77%29.94 inHg

6:00 AM

Partly cloudy night

65° 💧 None 💨 4 mph H 78%29.97 inHg

7:00 AM

Overcast

64° 💧 None 💨 4 mph H 79%29.97 inHg

8:00 AM

Overcast

66° 💧 None 💨 4 mph H 73%30.00 inHg

9:00 AM

Overcast

67° 💧 None 💨 4 mph H 68%30.00 inHg

10:00 AM

Partly cloudy

70° 💧 None 💨 3 mph H 60%30.03 inHg

11:00 AM

Sunny

73° 💧 None 💨 3 mph H 54%30.03 inHg

12:00 PM

Sunny

76° 💧 None 💨 4 mph H 48%30.00 inHg

1:00 PM

Sunny

78° 💧 None 💨 5 mph H 44%30.00 inHg

2:00 PM

Sunny

79° 💧 None 💨 5 mph H 41%30.00 inHg

3:00 PM

Sunny

80° 💧 None 💨 4 mph H 40%29.97 inHg

4:00 PM

Sunny

80° 💧 None 💨 5 mph H 40%29.97 inHg

5:00 PM

Sunny

80° 💧 None 💨 5 mph H 41%29.97 inHg

6:00 PM

Sunny

78° 💧 None 💨 5 mph H 44%29.97 inHg

7:00 PM

Sunny

75° 💧 None 💨 4 mph H 52%29.97 inHg

8:00 PM

Clear night

71° 💧 None 💨 5 mph H 56%30.00 inHg

9:00 PM

Mostly cloudy night

69° 💧 None 💨 4 mph H 58%30.03 inHg

10:00 PM

Mostly cloudy night

66° 💧 None 💨 3 mph H 65%30.03 inHg

11:00 PM

Mostly clear night

65° 💧 None 💨 2 mph H 68%30.06 inHg

Saturday

12:00 AM

Partly cloudy night

64° 💧 None 💨 3 mph H 70%30.06 inHg

1:00 AM

Mostly cloudy night

62° 💧 None 💨 3 mph H 74%30.06 inHg

2:00 AM

Mostly cloudy night

61° 💧 None 💨 3 mph H 77%30.06 inHg

3:00 AM

Overcast night

61° 💧 None 💨 4 mph H 80%30.06 inHg

4:00 AM

Overcast night

60° 💧 None 💨 4 mph H 83%30.06 inHg

5:00 AM

Overcast night

59° 💧 None 💨 4 mph H 84%30.06 inHg

6:00 AM

Overcast night

59° 💧 None 💨 4 mph H 83%30.06 inHg

7:00 AM

Overcast

59° 💧 None 💨 4 mph H 83%30.09 inHg

8:00 AM

Mostly cloudy

62° 💧 None 💨 4 mph H 79%30.12 inHg

9:00 AM

Partly cloudy

66° 💧 None 💨 4 mph H 70%30.12 inHg

10:00 AM

Mostly cloudy

71° 💧 None 💨 5 mph H 63%30.09 inHg

11:00 AM

Overcast

75° 💧 None 💨 7 mph H 64%30.09 inHg

12:00 PM

Overcast

77° 💧 None 💨 8 mph H 61%30.09 inHg

1:00 PM

Light rain

73° 💧 0.066 in 💨 7 mph H 78%30.09 inHg

2:00 PM

Heavy rain

71° 💧 0.314 in 💨 2 mph H 90%30.06 inHg

3:00 PM

Moderate rain

71° 💧 0.150 in 💨 4 mph H 91%30.03 inHg

4:00 PM

Thunderstorms

70° 💧 0.120 in 💨 6 mph H 95%30.03 inHg

5:00 PM

Overcast

73° 💧 0.000 in 💨 4 mph H 89%30.00 inHg

6:00 PM

Overcast

73° 💧 None 💨 4 mph H 88%30.00 inHg

7:00 PM

Overcast

72° 💧 None 💨 7 mph H 75%30.03 inHg

8:00 PM

Overcast night

71° 💧 None 💨 8 mph H 76%30.00 inHg

9:00 PM

Overcast night

69° 💧 0.004 in 💨 8 mph H 78%30.03 inHg

10:00 PM

Overcast night

68° 💧 0.001 in 💨 7 mph H 81%30.03 inHg

11:00 PM

Thunderstorms

67° 💧 0.114 in 💨 4 mph H 92%30.03 inHg

Sunday

12:00 AM

Light rain

67° 💧 0.035 in 💨 6 mph H 94%30.00 inHg

1:00 AM

Light rain

68° 💧 0.029 in 💨 7 mph H 96%30.00 inHg

2:00 AM

Overcast night

68° 💧 0.004 in 💨 5 mph H 97%29.97 inHg

3:00 AM

Light rain

69° 💧 0.032 in 💨 6 mph H 98%29.94 inHg

4:00 AM

Light rain

69° 💧 0.015 in 💨 3 mph H 98%29.94 inHg

5:00 AM

Light rain

69° 💧 0.004 in 💨 3 mph H 98%29.94 inHg

6:00 AM

Overcast night

69° 💧 0.001 in 💨 3 mph H 98%29.94 inHg

7:00 AM

Overcast

69° 💧 0.001 in 💨 3 mph H 99%29.94 inHg

8:00 AM

Overcast

70° 💧 None 💨 3 mph H 98%29.97 inHg

11:00 AM

Light rain

74° 💧 None 💨 7 mph H 88%30.00 inHg

2:00 PM

Mostly sunny

80° 💧 None 💨 8 mph H 70%29.91 inHg

5:00 PM

Mostly sunny

83° 💧 None 💨 6 mph H 61%29.88 inHg

8:00 PM

Mostly clear night

74° 💧 None 💨 4 mph H 83%29.91 inHg

11:00 PM

Mostly clear night

71° 💧 None 💨 5 mph H 90%29.97 inHg

Monday

2:00 AM

Clear night

68° 💧 None 💨 5 mph H 92%29.97 inHg

5:00 AM

Mostly clear night

64° 💧 None 💨 8 mph H 75%30.00 inHg

8:00 AM

Overcast

64° 💧 None 💨 4 mph H 69%30.09 inHg

11:00 AM

Mostly cloudy

68° 💧 None 💨 5 mph H 64%30.12 inHg

2:00 PM

Sunny

73° 💧 None 💨 8 mph H 53%30.09 inHg

5:00 PM

Sunny

72° 💧 None 💨 8 mph H 50%30.09 inHg

8:00 PM

Clear night

64° 💧 None 💨 5 mph H 67%30.15 inHg

11:00 PM

Clear night

60° 💧 None 💨 6 mph H 72%30.21 inHg

Tuesday

2:00 AM

Clear night

56° 💧 None 💨 5 mph H 76%30.24 inHg

5:00 AM

Clear night

55° 💧 None 💨 6 mph H 75%30.27 inHg

8:00 AM

Mostly sunny

56° 💧 None 💨 6 mph H 78%30.33 inHg

11:00 AM

Sunny

66° 💧 None 💨 5 mph H 61%30.33 inHg

2:00 PM

Partly cloudy

72° 💧 None 💨 4 mph H 53%30.30 inHg

5:00 PM

Sunny

73° 💧 None 💨 5 mph H 55%30.24 inHg

8:00 PM

Clear night

65° 💧 None 💨 4 mph H 76%30.24 inHg

11:00 PM

Clear night

61° 💧 None 💨 4 mph H 80%30.27 inHg

Wednesday

2:00 AM

Clear night

59° 💧 None 💨 2 mph H 89%30.30 inHg

8:00 AM

Mostly sunny

57° 💧 None 💨 2 mph H 86%30.33 inHg

2:00 PM

Sunny

60° 💧 None 💨 2 mph H 89%30.33 inHg

8:00 PM

Clear night

78° 💧 None 💨 7 mph H 61%30.24 inHg

Thursday

2:00 AM

Mostly clear night

71° 💧 None 💨 4 mph H 81%30.21 inHg

8:00 AM

Mostly sunny

65° 💧 None 💨 3 mph H 92%30.24 inHg

2:00 PM

Sunny

66° 💧 None 💨 1 mph H 90%30.21 inHg

8:00 PM

Clear night

83° 💧 None 💨 10 mph H 54%30.09 inHg

Friday

2:00 AM

Clear night

72° 💧 None 💨 5 mph H 68%30.00 inHg

8:00 AM

Mostly cloudy

67° 💧 None 💨 5 mph H 87%29.94 inHg

2:00 PM

Overcast

61° 💧 None 💨 8 mph H 93%30.00 inHg

8:00 PM

Overcast night

72° 💧 None 💨 8 mph H 52%30.06 inHg

Saturday

2:00 AM

Mostly cloudy night

62° 💧 None 💨 6 mph H 66%30.09 inHg

8:00 AM

Overcast

56° 💧 None 💨 7 mph H 75%30.18 inHg

2:00 PM

Mostly cloudy

57° 💧 None 💨 7 mph H 79%30.24 inHg

8:00 PM

Clear night

69° 💧 None 💨 7 mph H 45%30.21 inHg

Sunday

2:00 AM

Mostly cloudy night

60° 💧 None 💨 4 mph H 65%30.21 inHg

8:00 AM

Mostly sunny

52° 💧 None 💨 4 mph H 79%30.24 inHg

2:00 PM

Mostly sunny

54° 💧 None 💨 7 mph H 75%30.27 inHg

8:00 PM

Partly cloudy night

70° 💧 None 💨 6 mph H 50%30.21 inHg

Monday

2:00 AM

Overcast night

62° 💧 None 💨 6 mph H 57%30.21 inHg

8:00 AM

Overcast

56° 💧 None 💨 6 mph H 72%30.24 inHg

2:00 PM

Overcast

59° 💧 None 💨 9 mph H 65%30.27 inHg

8:00 PM

Overcast night

72° 💧 None 💨 12 mph H 45%30.27 inHg

Tuesday

2:00 AM

Mostly cloudy night

65° 💧 None 💨 7 mph H 60%30.30 inHg

8:00 AM

Mostly sunny

58° 💧 None 💨 9 mph H 81%30.33 inHg

2:00 PM

Sunny

57° 💧 None 💨 9 mph H 73%30.33 inHg

8:00 PM

Clear night

74° 💧 None 💨 10 mph H 33%30.27 inHg

Wednesday

2:00 AM

Clear night

63° 💧 None 💨 6 mph H 45%30.24 inHg

8:00 AM

Sunny

54° 💧 None 💨 5 mph H 65%30.21 inHg

2:00 PM

Sunny

55° 💧 None 💨 4 mph H 68%30.21 inHg

8:00 PM

Clear night

74° 💧 None 💨 2 mph H 37%30.06 inHg

Thursday

2:00 AM

Clear night

64° 💧 None 💨 5 mph H 61%29.97 inHg

8:00 AM

Sunny

61° 💧 None 💨 8 mph H 69%29.94 inHg

2:00 PM

Mostly sunny

63° 💧 None 💨 10 mph H 78%29.97 inHg

8:00 PM

Clear night

71° 💧 None 💨 13 mph H 46%30.00 inHg

Friday

2:00 AM

Clear night

60° 💧 None 💨 6 mph H 62%30.09 inHg

In Fullerton and, more broadly, across the state of Pennsylvania: As the afternoon progresses into the evening, expect a mix of sun and clouds with temperatures remaining mild to warm, ranging from 73 to 81 degrees Fahrenheit. Light west winds will blow at around 8 mph, with occasional gusts reaching 13 mph. A small chance of rain persists, with possible total accumulation around 0.03 inches. The evening could see brief periods of light rain, especially if clouds deepen, but significant precipitation is unlikely. Temperatures will gently cool as night approaches, providing a relatively comfortable end to the day. Overall, conditions are expected to be fairly typical for this time of year, with no severe weather anticipated.

15-Day Weather Outlook for Fullerton

TomorrowTomorrow

Mostly sunny 80°/64° 💧 None 💨 5 mph

Saturday, Sep 12Sat Sep 12

Thunderstorms 77°/59° 💧 None 💨 8 mph

Sunday, Sep 13Sun Sep 13

Thunderstorms 83°/67° 💧 0.033 in 💨 8 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 74°/64° 💧 0.001 in 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 73°/55° 💧 None 💨 6 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 65°/57° 💧 None 💨 4 mph

Thursday, Sep 17Thu Sep 17

Mostly sunny 78°/65° 💧 None 💨 7 mph

Friday, Sep 18Fri Sep 18

Overcast 83°/61° 💧 0.362 in 💨 10 mph

Saturday, Sep 19Sat Sep 19

Overcast 72°/56° 💧 None 💨 8 mph

Sunday, Sep 20Sun Sep 20

Mostly cloudy 69°/52° 💧 None 💨 7 mph

Monday, Sep 21Mon Sep 21

Partly cloudy 70°/56° 💧 None 💨 9 mph

Tuesday, Sep 22Tue Sep 22

Overcast 72°/57° 💧 None 💨 12 mph

Wednesday, Sep 23Wed Sep 23

Sunny 74°/54° 💧 None 💨 10 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 74°/61° 💧 None 💨 10 mph

Friday, Sep 25Fri Sep 25

Sunny 71°/60° 💧 None 💨 13 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Fullerton

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Fullerton

Hourly forecast · Updated every 2 hours

Moderate

Nearest forecast value 4:00 PM

PM2.5 Fine particles Good 3,9µg/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 4,3µg/m³

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

O₃ Ozone Moderate 100,8µg/m³

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

NO₂ Nitrogen dioxide Good 1,5µg/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 Fullerton

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 7,2High 😐Moderate

Tomorrow UV 5,9Moderate 🙂Fair

Saturday UV 4,4Moderate 😐Moderate

Sunday UV 5,4Moderate 🙂Fair

Monday UV 6,0High 🙂Fair

Tuesday UV 5,0Moderate —Unavailable

Wednesday UV 6,0High —Unavailable

Hourly UV index today

4:00 PMUV 2,8 5:00 PMUV 1,5 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.

Caution for sensitive people

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

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

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 Fullerton

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · FULLERTON, PENNSYLVANIA

Tonight's Stargazing & Shooting Stars

Good observing conditions. Best local viewing window: 5:00 AM–6:00 AM.

75/100Best-hour score

BEST TIME TONIGHT 5:00 AM–6:00 AM Astronomical darkness: 8:53 PM–5:05 AM

☁ Cloud cover 35% Real hourly forecast for the best viewing hour.

☾ Moonlight 0% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 88° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min72%

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.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for Fullerton were last refreshed today at 3:40 PM. The current forecast period extends through 12/09/2026 at 1:00 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.