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Current weather in Mount Gretna is clear sky.

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

Now · 3:59 PM

Mount Gretna Weather & Hourly Forecast

United States · Pennsylvania · 17064

82°F

Sunny

Feels like: 78°F

💧 Humidity 40% 🌡 Pressure 29.97 inHg 💨 Wind 8 mph 👁 Visibility 28.3 mi ☁ Clouds 9% ☀️ UV index 4.4 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Mount Gretna

Today

4:00 PM

Sunny

82° 💧 None 💨 8 mph H 40%29.97 inHg

7:00 PM

Sunny

76° 💧 0.000 in 💨 5 mph H 51%29.97 inHg

10:00 PM

Mostly cloudy night

69° 💧 None 💨 6 mph H 63%30.03 inHg

Tomorrow

1:00 AM

Clear night

65° 💧 None 💨 5 mph H 70%30.06 inHg

4:00 AM

Partly cloudy night

63° 💧 None 💨 6 mph H 72%30.06 inHg

7:00 AM

Overcast

63° 💧 None 💨 6 mph H 68%30.09 inHg

10:00 AM

Mostly cloudy

73° 💧 None 💨 8 mph H 57%30.09 inHg

1:00 PM

Overcast

78° 💧 None 💨 10 mph H 55%30.06 inHg

4:00 PM

Overcast

82° 💧 None 💨 11 mph H 51%30.00 inHg

7:00 PM

Overcast

77° 💧 0.001 in 💨 10 mph H 71%30.00 inHg

10:00 PM

Overcast night

72° 💧 0.006 in 💨 11 mph H 80%30.00 inHg

Sunday

1:00 AM

Thunderstorms

70° 💧 0.233 in 💨 6 mph H 98%30.00 inHg

4:00 AM

Light rain

71° 💧 0.083 in 💨 5 mph H 99%29.91 inHg

7:00 AM

Light rain

70° 💧 0.019 in 💨 5 mph H 99%29.91 inHg

10:00 AM

Overcast

74° 💧 0.010 in 💨 7 mph H 91%29.94 inHg

1:00 PM

Light rain

80° 💧 0.014 in 💨 8 mph H 70%29.91 inHg

Today

4:00 PM

Sunny

82° 💧 None 💨 8 mph H 40%29.97 inHg

5:00 PM

Mostly sunny

81° 💧 None 💨 7 mph H 41%29.97 inHg

6:00 PM

Sunny

79° 💧 None 💨 6 mph H 43%29.97 inHg

7:00 PM

Sunny

76° 💧 0.000 in 💨 5 mph H 51%29.97 inHg

8:00 PM

Mostly clear night

72° 💧 None 💨 5 mph H 59%30.00 inHg

9:00 PM

Mostly clear night

70° 💧 None 💨 5 mph H 61%30.03 inHg

10:00 PM

Mostly cloudy night

69° 💧 None 💨 6 mph H 63%30.03 inHg

11:00 PM

Mostly cloudy night

68° 💧 None 💨 5 mph H 63%30.03 inHg

Tomorrow

12:00 AM

Partly cloudy night

66° 💧 None 💨 4 mph H 67%30.03 inHg

1:00 AM

Clear night

65° 💧 None 💨 5 mph H 70%30.06 inHg

2:00 AM

Clear night

64° 💧 None 💨 5 mph H 72%30.06 inHg

3:00 AM

Mostly clear night

63° 💧 None 💨 5 mph H 72%30.06 inHg

4:00 AM

Partly cloudy night

63° 💧 None 💨 6 mph H 72%30.06 inHg

5:00 AM

Mostly cloudy night

62° 💧 None 💨 6 mph H 71%30.06 inHg

6:00 AM

Overcast night

63° 💧 None 💨 6 mph H 70%30.06 inHg

7:00 AM

Overcast

63° 💧 None 💨 6 mph H 68%30.09 inHg

8:00 AM

Overcast

66° 💧 None 💨 6 mph H 62%30.09 inHg

9:00 AM

Partly cloudy

68° 💧 None 💨 6 mph H 58%30.09 inHg

10:00 AM

Mostly cloudy

73° 💧 None 💨 8 mph H 57%30.09 inHg

11:00 AM

Overcast

76° 💧 None 💨 11 mph H 60%30.09 inHg

12:00 PM

Overcast

77° 💧 None 💨 10 mph H 60%30.06 inHg

1:00 PM

Overcast

78° 💧 None 💨 10 mph H 55%30.06 inHg

2:00 PM

Overcast

81° 💧 None 💨 11 mph H 53%30.03 inHg

3:00 PM

Overcast

81° 💧 None 💨 10 mph H 53%30.00 inHg

4:00 PM

Overcast

82° 💧 None 💨 11 mph H 51%30.00 inHg

5:00 PM

Overcast

81° 💧 None 💨 11 mph H 57%30.00 inHg

6:00 PM

Overcast

79° 💧 None 💨 12 mph H 64%30.00 inHg

7:00 PM

Overcast

77° 💧 None 💨 10 mph H 71%30.00 inHg

8:00 PM

Overcast night

76° 💧 None 💨 11 mph H 73%29.97 inHg

9:00 PM

Overcast night

73° 💧 0.001 in 💨 11 mph H 75%30.00 inHg

10:00 PM

Overcast night

72° 💧 0.001 in 💨 11 mph H 80%30.00 inHg

11:00 PM

Overcast night

72° 💧 0.002 in 💨 10 mph H 85%30.00 inHg

Sunday

12:00 AM

Overcast night

72° 💧 0.003 in 💨 10 mph H 88%30.00 inHg

1:00 AM

Thunderstorms

70° 💧 0.147 in 💨 6 mph H 98%30.00 inHg

2:00 AM

Light thunderstorms

70° 💧 0.077 in 💨 5 mph H 98%29.94 inHg

3:00 AM

Light rain

70° 💧 0.009 in 💨 5 mph H 99%29.94 inHg

4:00 AM

Light rain

71° 💧 0.030 in 💨 5 mph H 99%29.91 inHg

5:00 AM

Light rain

70° 💧 0.032 in 💨 7 mph H 99%29.91 inHg

6:00 AM

Light rain

70° 💧 0.021 in 💨 6 mph H 99%29.91 inHg

7:00 AM

Light rain

70° 💧 0.006 in 💨 5 mph H 99%29.91 inHg

8:00 AM

Light rain

70° 💧 0.007 in 💨 5 mph H 98%29.94 inHg

9:00 AM

Light rain

72° 💧 0.005 in 💨 7 mph H 95%29.94 inHg

10:00 AM

Overcast

74° 💧 0.004 in 💨 7 mph H 91%29.94 inHg

11:00 AM

Overcast

76° 💧 0.003 in 💨 8 mph H 82%29.94 inHg

12:00 PM

Mostly cloudy

79° 💧 0.004 in 💨 9 mph H 73%29.94 inHg

1:00 PM

Light rain

80° 💧 0.006 in 💨 8 mph H 70%29.91 inHg

2:00 PM

Light rain

82° 💧 0.004 in 💨 8 mph H 64%29.88 inHg

3:00 PM

Partly cloudy

83° 💧 0.003 in 💨 9 mph H 61%29.88 inHg

4:00 PM

Sunny

83° 💧 0.000 in 💨 9 mph H 61%29.85 inHg

5:00 PM

Sunny

83° 💧 None 💨 8 mph H 60%29.85 inHg

6:00 PM

Sunny

82° 💧 None 💨 8 mph H 63%29.88 inHg

7:00 PM

Sunny

79° 💧 None 💨 4 mph H 71%29.88 inHg

8:00 PM

Clear night

76° 💧 None 💨 4 mph H 79%29.88 inHg

9:00 PM

Clear night

75° 💧 None 💨 6 mph H 79%29.91 inHg

10:00 PM

Mostly clear night

75° 💧 None 💨 6 mph H 78%29.94 inHg

11:00 PM

Mostly cloudy night

73° 💧 None 💨 7 mph H 80%29.94 inHg

Monday

12:00 AM

Mostly cloudy night

72° 💧 None 💨 5 mph H 84%29.91 inHg

1:00 AM

Mostly clear night

71° 💧 None 💨 6 mph H 86%29.91 inHg

2:00 AM

Clear night

70° 💧 None 💨 7 mph H 88%29.91 inHg

3:00 AM

Clear night

70° 💧 None 💨 7 mph H 89%29.91 inHg

4:00 AM

Mostly clear night

69° 💧 None 💨 7 mph H 90%29.91 inHg

5:00 AM

Overcast night

69° 💧 None 💨 7 mph H 89%29.94 inHg

6:00 AM

Overcast night

71° 💧 None 💨 10 mph H 78%29.97 inHg

7:00 AM

Overcast

69° 💧 0.001 in 💨 11 mph H 70%30.00 inHg

8:00 AM

Moderate rain

66° 💧 0.102 in 💨 7 mph H 92%30.06 inHg

11:00 AM

Sunny

71° 💧 None 💨 12 mph H 61%30.09 inHg

2:00 PM

Sunny

73° 💧 None 💨 12 mph H 46%30.09 inHg

5:00 PM

Sunny

72° 💧 None 💨 11 mph H 46%30.09 inHg

8:00 PM

Clear night

65° 💧 None 💨 6 mph H 64%30.15 inHg

11:00 PM

Clear night

60° 💧 None 💨 8 mph H 67%30.24 inHg

Tuesday

2:00 AM

Clear night

56° 💧 None 💨 6 mph H 78%30.24 inHg

5:00 AM

Clear night

54° 💧 None 💨 5 mph H 86%30.30 inHg

8:00 AM

Sunny

56° 💧 None 💨 5 mph H 80%30.33 inHg

11:00 AM

Sunny

68° 💧 None 💨 6 mph H 50%30.36 inHg

2:00 PM

Sunny

74° 💧 None 💨 4 mph H 41%30.33 inHg

5:00 PM

Mostly sunny

75° 💧 None 💨 5 mph H 42%30.27 inHg

8:00 PM

Clear night

67° 💧 None 💨 7 mph H 60%30.27 inHg

11:00 PM

Partly cloudy night

62° 💧 None 💨 6 mph H 73%30.30 inHg

Wednesday

2:00 AM

Mostly cloudy night

60° 💧 None 💨 5 mph H 85%30.33 inHg

5:00 AM

Clear night

58° 💧 None 💨 5 mph H 95%30.30 inHg

8:00 AM

Sunny

62° 💧 None 💨 3 mph H 89%30.33 inHg

11:00 AM

Sunny

73° 💧 None 💨 5 mph H 62%30.33 inHg

2:00 PM

Sunny

80° 💧 None 💨 5 mph H 48%30.27 inHg

5:00 PM

Sunny

82° 💧 None 💨 3 mph H 46%30.24 inHg

8:00 PM

Clear night

74° 💧 None 💨 8 mph H 66%30.21 inHg

11:00 PM

Clear night

69° 💧 None 💨 6 mph H 72%30.24 inHg

Thursday

2:00 AM

Mostly clear night

67° 💧 None 💨 5 mph H 76%30.21 inHg

5:00 AM

Clear night

65° 💧 None 💨 5 mph H 80%30.18 inHg

8:00 AM

Mostly sunny

68° 💧 None 💨 5 mph H 74%30.15 inHg

2:00 PM

Partly cloudy

77° 💧 None 💨 5 mph H 75%30.09 inHg

8:00 PM

Mostly clear night

72° 💧 None 💨 9 mph H 85%30.09 inHg

Friday

2:00 AM

Mostly clear night

64° 💧 None 💨 8 mph H 80%30.15 inHg

8:00 AM

Sunny

61° 💧 None 💨 8 mph H 72%30.21 inHg

2:00 PM

Sunny

76° 💧 None 💨 8 mph H 40%30.15 inHg

8:00 PM

Clear night

67° 💧 None 💨 9 mph H 56%30.12 inHg

Saturday

2:00 AM

Overcast night

59° 💧 None 💨 6 mph H 76%30.12 inHg

8:00 AM

Partly cloudy

57° 💧 None 💨 3 mph H 83%30.12 inHg

2:00 PM

Mostly sunny

76° 💧 None 💨 3 mph H 41%30.03 inHg

8:00 PM

Mostly cloudy night

67° 💧 None 💨 2 mph H 58%29.94 inHg

Sunday

2:00 AM

Light rain

63° 💧 None 💨 5 mph H 85%29.91 inHg

8:00 AM

Overcast

62° 💧 None 💨 7 mph H 91%29.88 inHg

2:00 PM

Overcast

71° 💧 None 💨 7 mph H 71%29.85 inHg

8:00 PM

Partly cloudy night

69° 💧 None 💨 5 mph H 74%29.88 inHg

Monday

2:00 AM

Partly cloudy night

64° 💧 None 💨 1 mph H 87%29.91 inHg

8:00 AM

Partly cloudy

65° 💧 None 💨 3 mph H 84%29.94 inHg

2:00 PM

Overcast

79° 💧 None 💨 5 mph H 52%29.94 inHg

8:00 PM

Clear night

70° 💧 None 💨 5 mph H 72%29.94 inHg

Tuesday

2:00 AM

Mostly clear night

65° 💧 None 💨 4 mph H 77%30.00 inHg

8:00 AM

Overcast

66° 💧 None 💨 6 mph H 86%30.06 inHg

2:00 PM

Moderate rain

75° 💧 None 💨 12 mph H 65%30.03 inHg

8:00 PM

Light rain

69° 💧 None 💨 9 mph H 95%30.06 inHg

Wednesday

2:00 AM

Light rain

67° 💧 None 💨 13 mph H 94%30.06 inHg

8:00 AM

Moderate rain

68° 💧 None 💨 10 mph H 98%30.03 inHg

2:00 PM

Moderate rain

71° 💧 None 💨 11 mph H 97%30.00 inHg

8:00 PM

Moderate rain

71° 💧 None 💨 9 mph H 98%29.97 inHg

Thursday

2:00 AM

Overcast night

69° 💧 None 💨 6 mph H 99%29.97 inHg

8:00 AM

Overcast

65° 💧 None 💨 5 mph H 98%30.00 inHg

2:00 PM

Mostly cloudy

73° 💧 None 💨 6 mph H 62%29.97 inHg

8:00 PM

Overcast night

66° 💧 None 💨 4 mph H 77%29.97 inHg

Friday

2:00 AM

Partly cloudy night

61° 💧 None 💨 6 mph H 83%29.97 inHg

8:00 AM

Partly cloudy

60° 💧 None 💨 6 mph H 88%30.00 inHg

2:00 PM

Overcast

68° 💧 None 💨 10 mph H 55%30.00 inHg

8:00 PM

Mostly cloudy night

60° 💧 None 💨 5 mph H 78%30.00 inHg

Saturday

2:00 AM

Clear night

56° 💧 None 💨 7 mph H 84%30.06 inHg

8:00 AM

Sunny

55° 💧 None 💨 6 mph H 90%30.09 inHg

In Mount Gretna and, more broadly, across the state of Pennsylvania: The rest of the day will be mostly sunny with a few clouds, providing pleasant weather conditions. Temperatures will range from the mid-60s to the upper 70s, creating mild to warm conditions that are comfortable for outdoor activities. Light north winds will prevail, with speeds up to 4 mph and gusts reaching 6 mph. No precipitation is expected, so outdoor plans should be smooth sailing. As the afternoon progresses, expect clear skies and gentle breezes, making for a calm and inviting evening. Overall, it looks like a lovely day ahead with favorable weather conditions continuing into the evening.

15-Day Weather Outlook for Mount Gretna

TomorrowTomorrow

Overcast 81°/64° 💧 None 💨 13 mph

Sunday, Sep 13Sun Sep 13

Light thunderstorms 82°/70° 💧 None 💨 10 mph

Monday, Sep 14Mon Sep 14

Mostly cloudy 75°/67° 💧 0.499 in 💨 12 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 75°/53° 💧 None 💨 9 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 82°/58° 💧 None 💨 6 mph

Thursday, Sep 17Thu Sep 17

Sunny 72°/64° 💧 0.205 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Light rain 82°/60° 💧 0.040 in 💨 7 mph

Saturday, Sep 19Sat Sep 19

Mostly cloudy 76°/59° 💧 None 💨 6 mph

Sunday, Sep 20Sun Sep 20

Light rain 73°/61° 💧 1.436 in 💨 15 mph

Monday, Sep 21Mon Sep 21

Mostly cloudy 73°/54° 💧 0.002 in 💨 12 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 63°/47° 💧 None 💨 15 mph

Wednesday, Sep 23Wed Sep 23

Overcast 61°/48° 💧 None 💨 5 mph

Thursday, Sep 24Thu Sep 24

Sunny 65°/50° 💧 None 💨 4 mph

Friday, Sep 25Fri Sep 25

Mostly sunny 70°/56° 💧 None 💨 7 mph

Saturday, Sep 26Sat Sep 26

Partly cloudy 76°/66° 💧 None 💨 8 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Mount Gretna

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Mount Gretna

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 4:00 PM

PM2.5 Fine particles Good 7,2µg/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 8,2µg/m³

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

O₃ Ozone Fair 97,1µg/m³

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

NO₂ Nitrogen dioxide Good 4,0µg/m³

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

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Mount Gretna

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 5,4Moderate 🙂Fair

Tomorrow UV 3,3Moderate 🙂Fair

Sunday UV 5,5Moderate 🙂Fair

Monday UV 6,2High 🙂Fair

Tuesday UV 6,0High 🙂Fair

Wednesday UV 7,0High —Unavailable

Thursday UV 6,0High —Unavailable

Hourly UV index today

4:00 PMUV 2,8 5:00 PMUV 1,3 6:00 PMUV 0,4 7:00 PMUV 0,0

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged 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 Mount Gretna

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · MOUNT GRETNA, PENNSYLVANIA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 1:00 AM–2:00 AM.

96/100Best-hour score

BEST TIME TONIGHT 1:00 AM–2:00 AM Astronomical darkness: 8:54 PM–5:11 AM

☁ Cloud cover 5% 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 46° 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 min69%

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 Mount Gretna were last refreshed today at 3:59 PM. The current forecast period extends through 13/09/2026 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.