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

Now · 9:17 PM

Castalian Springs Weather & Hourly Forecast

United States · Tennessee · 37031

70°F

Mostly clear night

Feels like: 69°F

💧 Humidity 72% 🌡 Pressure 30.09 inHg 💨 Wind 9 mph 👁 Visibility 18.4 mi ☁ Clouds 13% ☀️ UV index 0.0 · Low 🌅 Sunrise 6:32 AM 🌇 Sunset 6:43 PM

Hourly Forecast for Castalian Springs

Today

10:00 PM

Clear night

70° 💧 None 💨 8 mph H 74%30.09 inHg

Tomorrow

1:00 AM

Clear night

68° 💧 None 💨 6 mph H 77%30.09 inHg

4:00 AM

Overcast night

67° 💧 0.001 in 💨 7 mph H 78%30.09 inHg

7:00 AM

Overcast

68° 💧 None 💨 7 mph H 75%30.12 inHg

10:00 AM

Overcast

72° 💧 0.001 in 💨 6 mph H 69%30.15 inHg

1:00 PM

Overcast

75° 💧 0.002 in 💨 6 mph H 66%30.12 inHg

4:00 PM

Overcast

77° 💧 None 💨 7 mph H 55%30.09 inHg

7:00 PM

Overcast night

73° 💧 None 💨 7 mph H 64%30.12 inHg

10:00 PM

Mostly cloudy night

70° 💧 None 💨 9 mph H 72%30.15 inHg

Thursday

1:00 AM

Mostly cloudy night

68° 💧 0.001 in 💨 7 mph H 80%30.12 inHg

4:00 AM

Overcast night

67° 💧 0.001 in 💨 6 mph H 83%30.15 inHg

7:00 AM

Overcast

67° 💧 None 💨 4 mph H 85%30.15 inHg

10:00 AM

Mostly cloudy

74° 💧 0.008 in 💨 6 mph H 67%30.18 inHg

1:00 PM

Mostly cloudy

80° 💧 0.002 in 💨 6 mph H 49%30.12 inHg

4:00 PM

Partly cloudy

82° 💧 None 💨 7 mph H 45%30.09 inHg

7:00 PM

Mostly cloudy night

76° 💧 None 💨 8 mph H 58%30.12 inHg

Today

10:00 PM

Clear night

70° 💧 None 💨 8 mph H 74%30.09 inHg

11:00 PM

Clear night

69° 💧 None 💨 7 mph H 75%30.09 inHg

Tomorrow

12:00 AM

Clear night

68° 💧 None 💨 6 mph H 76%30.09 inHg

1:00 AM

Clear night

68° 💧 None 💨 6 mph H 77%30.09 inHg

2:00 AM

Mostly clear night

67° 💧 None 💨 6 mph H 78%30.09 inHg

3:00 AM

Mostly cloudy night

67° 💧 None 💨 6 mph H 79%30.09 inHg

4:00 AM

Overcast night

67° 💧 None 💨 7 mph H 78%30.09 inHg

5:00 AM

Overcast night

67° 💧 None 💨 7 mph H 77%30.12 inHg

6:00 AM

Overcast night

68° 💧 0.001 in 💨 7 mph H 76%30.12 inHg

7:00 AM

Overcast

68° 💧 None 💨 7 mph H 75%30.12 inHg

8:00 AM

Overcast

69° 💧 None 💨 7 mph H 73%30.15 inHg

9:00 AM

Overcast

70° 💧 None 💨 6 mph H 72%30.15 inHg

10:00 AM

Overcast

72° 💧 None 💨 6 mph H 69%30.15 inHg

11:00 AM

Overcast

73° 💧 None 💨 7 mph H 68%30.15 inHg

12:00 PM

Overcast

74° 💧 0.001 in 💨 6 mph H 68%30.15 inHg

1:00 PM

Overcast

75° 💧 0.002 in 💨 6 mph H 66%30.12 inHg

2:00 PM

Overcast

76° 💧 None 💨 7 mph H 62%30.12 inHg

3:00 PM

Overcast

78° 💧 None 💨 7 mph H 57%30.09 inHg

4:00 PM

Overcast

77° 💧 None 💨 7 mph H 55%30.09 inHg

5:00 PM

Overcast

76° 💧 None 💨 9 mph H 57%30.09 inHg

6:00 PM

Overcast

74° 💧 None 💨 10 mph H 63%30.12 inHg

7:00 PM

Overcast night

73° 💧 None 💨 7 mph H 64%30.12 inHg

8:00 PM

Overcast night

73° 💧 None 💨 8 mph H 64%30.12 inHg

9:00 PM

Overcast night

72° 💧 None 💨 9 mph H 65%30.15 inHg

10:00 PM

Mostly cloudy night

70° 💧 None 💨 9 mph H 72%30.15 inHg

11:00 PM

Overcast night

69° 💧 None 💨 8 mph H 77%30.15 inHg

Thursday

12:00 AM

Mostly cloudy night

68° 💧 None 💨 7 mph H 80%30.15 inHg

1:00 AM

Mostly cloudy night

68° 💧 None 💨 7 mph H 80%30.12 inHg

2:00 AM

Overcast night

68° 💧 None 💨 6 mph H 80%30.15 inHg

3:00 AM

Overcast night

68° 💧 0.001 in 💨 6 mph H 81%30.15 inHg

4:00 AM

Overcast night

67° 💧 None 💨 6 mph H 83%30.15 inHg

5:00 AM

Overcast night

67° 💧 0.001 in 💨 5 mph H 84%30.15 inHg

6:00 AM

Overcast night

67° 💧 None 💨 4 mph H 84%30.15 inHg

7:00 AM

Overcast

67° 💧 None 💨 4 mph H 85%30.15 inHg

8:00 AM

Overcast

69° 💧 None 💨 5 mph H 81%30.18 inHg

9:00 AM

Overcast

71° 💧 None 💨 5 mph H 74%30.18 inHg

10:00 AM

Mostly cloudy

74° 💧 0.002 in 💨 6 mph H 67%30.18 inHg

11:00 AM

Light rain

76° 💧 0.006 in 💨 6 mph H 61%30.18 inHg

12:00 PM

Mostly cloudy

78° 💧 None 💨 5 mph H 54%30.15 inHg

1:00 PM

Mostly cloudy

80° 💧 None 💨 6 mph H 49%30.12 inHg

2:00 PM

Overcast

81° 💧 0.002 in 💨 7 mph H 48%30.12 inHg

3:00 PM

Mostly cloudy

81° 💧 None 💨 8 mph H 49%30.09 inHg

4:00 PM

Partly cloudy

82° 💧 None 💨 7 mph H 45%30.09 inHg

5:00 PM

Mostly cloudy

80° 💧 None 💨 11 mph H 51%30.09 inHg

6:00 PM

Mostly sunny

77° 💧 None 💨 10 mph H 56%30.09 inHg

7:00 PM

Mostly cloudy night

76° 💧 None 💨 8 mph H 58%30.12 inHg

8:00 PM

Mostly cloudy night

75° 💧 None 💨 9 mph H 59%30.12 inHg

9:00 PM

Clear night

73° 💧 None 💨 10 mph H 60%30.15 inHg

10:00 PM

Clear night

71° 💧 None 💨 8 mph H 64%30.15 inHg

11:00 PM

Clear night

70° 💧 None 💨 7 mph H 67%30.15 inHg

Friday

12:00 AM

Clear night

68° 💧 None 💨 8 mph H 70%30.15 inHg

1:00 AM

Clear night

67° 💧 None 💨 8 mph H 72%30.12 inHg

2:00 AM

Clear night

66° 💧 None 💨 7 mph H 74%30.12 inHg

3:00 AM

Clear night

65° 💧 None 💨 7 mph H 77%30.12 inHg

4:00 AM

Clear night

64° 💧 None 💨 6 mph H 79%30.15 inHg

5:00 AM

Clear night

63° 💧 None 💨 6 mph H 81%30.15 inHg

6:00 AM

Clear night

62° 💧 None 💨 5 mph H 82%30.18 inHg

7:00 AM

Sunny

62° 💧 None 💨 6 mph H 82%30.18 inHg

4:00 PM

Sunny

76° 💧 None 💨 9 mph H 43%30.09 inHg

7:00 PM

Clear night

69° 💧 None 💨 10 mph H 50%30.12 inHg

10:00 PM

Clear night

64° 💧 None 💨 9 mph H 55%30.12 inHg

Saturday

1:00 AM

Clear night

60° 💧 None 💨 8 mph H 63%30.12 inHg

4:00 AM

Mostly clear night

59° 💧 None 💨 7 mph H 64%30.12 inHg

7:00 AM

Partly cloudy

57° 💧 None 💨 6 mph H 68%30.15 inHg

10:00 AM

Mostly cloudy

66° 💧 None 💨 4 mph H 51%30.15 inHg

1:00 PM

Partly cloudy

77° 💧 None 💨 3 mph H 29%30.09 inHg

4:00 PM

Overcast

78° 💧 None 💨 6 mph H 26%30.03 inHg

7:00 PM

Overcast night

71° 💧 None 💨 8 mph H 38%30.03 inHg

10:00 PM

Overcast night

67° 💧 None 💨 8 mph H 44%30.03 inHg

Sunday

1:00 AM

Overcast night

63° 💧 None 💨 6 mph H 55%30.03 inHg

4:00 AM

Overcast night

63° 💧 None 💨 5 mph H 62%30.00 inHg

7:00 AM

Mostly sunny

60° 💧 None 💨 6 mph H 72%30.03 inHg

10:00 AM

Partly cloudy

72° 💧 None 💨 5 mph H 39%30.00 inHg

1:00 PM

Mostly sunny

77° 💧 None 💨 6 mph H 34%29.97 inHg

4:00 PM

Sunny

79° 💧 None 💨 7 mph H 33%29.91 inHg

7:00 PM

Clear night

70° 💧 None 💨 5 mph H 52%29.91 inHg

10:00 PM

Clear night

65° 💧 None 💨 6 mph H 45%29.94 inHg

Monday

1:00 AM

Clear night

63° 💧 None 💨 7 mph H 50%29.91 inHg

4:00 AM

Clear night

61° 💧 None 💨 5 mph H 60%29.91 inHg

7:00 AM

Sunny

60° 💧 None 💨 5 mph H 67%29.91 inHg

10:00 AM

Sunny

75° 💧 None 💨 2 mph H 35%29.94 inHg

1:00 PM

Sunny

83° 💧 None 💨 2 mph H 29%29.88 inHg

7:00 PM

Clear night

81° 💧 None 💨 5 mph H 22%29.91 inHg

Tuesday

1:00 AM

Clear night

73° 💧 None 💨 5 mph H 33%29.88 inHg

7:00 AM

Sunny

66° 💧 None 💨 7 mph H 38%29.88 inHg

1:00 PM

Mostly sunny

61° 💧 None 💨 4 mph H 52%29.91 inHg

7:00 PM

Clear night

86° 💧 None 💨 5 mph H 27%29.85 inHg

Wednesday

1:00 AM

Clear night

79° 💧 None 💨 1 mph H 34%29.80 inHg

7:00 AM

Mostly sunny

72° 💧 None 💨 8 mph H 45%29.83 inHg

1:00 PM

Mostly sunny

71° 💧 None 💨 8 mph H 45%29.80 inHg

7:00 PM

Moderate rain

71° 💧 None 💨 7 mph H 97%29.80 inHg

Thursday

1:00 AM

Light rain

71° 💧 None 💨 10 mph H 92%29.74 inHg

7:00 AM

Moderate rain

69° 💧 None 💨 14 mph H 93%29.77 inHg

1:00 PM

Light rain

67° 💧 None 💨 12 mph H 99%29.80 inHg

7:00 PM

Moderate rain

70° 💧 None 💨 11 mph H 93%29.83 inHg

Friday

1:00 AM

Light rain

68° 💧 None 💨 7 mph H 96%29.83 inHg

7:00 AM

Moderate rain

66° 💧 None 💨 9 mph H 99%29.88 inHg

1:00 PM

Mostly cloudy

67° 💧 None 💨 6 mph H 99%29.94 inHg

7:00 PM

Light rain

77° 💧 None 💨 5 mph H 71%29.91 inHg

Saturday

1:00 AM

Mostly clear night

74° 💧 None 💨 0 mph H 81%29.85 inHg

7:00 AM

Sunny

67° 💧 None 💨 5 mph H 94%29.88 inHg

1:00 PM

Mostly sunny

66° 💧 None 💨 6 mph H 99%29.88 inHg

7:00 PM

Partly cloudy night

80° 💧 None 💨 11 mph H 63%29.80 inHg

Sunday

1:00 AM

Mostly clear night

68° 💧 None 💨 7 mph H 99%29.80 inHg

7:00 AM

Sunny

60° 💧 None 💨 7 mph H 90%29.83 inHg

1:00 PM

Sunny

56° 💧 None 💨 6 mph H 91%29.91 inHg

7:00 PM

Mostly clear night

69° 💧 None 💨 12 mph H 53%29.91 inHg

Monday

1:00 AM

Mostly clear night

60° 💧 None 💨 6 mph H 68%29.94 inHg

7:00 AM

Sunny

54° 💧 None 💨 4 mph H 85%29.97 inHg

1:00 PM

Sunny

51° 💧 None 💨 5 mph H 92%30.03 inHg

7:00 PM

Clear night

67° 💧 None 💨 7 mph H 55%30.03 inHg

Tuesday

1:00 AM

Mostly clear night

60° 💧 None 💨 4 mph H 79%29.97 inHg

7:00 AM

Overcast

55° 💧 None 💨 6 mph H 82%30.00 inHg

1:00 PM

Overcast

54° 💧 None 💨 4 mph H 89%30.03 inHg

7:00 PM

Overcast night

68° 💧 None 💨 3 mph H 55%30.00 inHg

Wednesday

1:00 AM

Overcast night

62° 💧 None 💨 3 mph H 75%29.97 inHg

7:00 AM

Overcast

58° 💧 None 💨 6 mph H 81%29.97 inHg

1:00 PM

Overcast

56° 💧 None 💨 7 mph H 78%30.00 inHg

In Castalian Springs and, more broadly, across the state of Tennessee: This morning will start with mostly cloudy skies, and temperatures will be warm, ranging from the mid-70s to the low 90s. Light southwest winds at around 6 mph will bring occasional gusts up to 13 mph. As the day progresses, conditions will remain quite hot, with temperatures staying in the 70s to the low 90s. There’s a possibility of light rain, with an accumulation of about 0.16 inches, and the highest likelihood of rain will be later in the afternoon. The winds will continue to be gentle, mostly southwest at 6 mph, with some gusts. Overall, it will be a warm and partly cloudy day with a chance of brief showers in the afternoon.

15-Day Weather Outlook for Castalian Springs

TomorrowTomorrow

Mostly sunny 78°/67° 💧 None 💨 10 mph

Thursday, Sep 24Thu Sep 24

Mostly cloudy 82°/67° 💧 None 💨 11 mph

Friday, Sep 25Fri Sep 25

Sunny 76°/62° 💧 0.040 in 💨 10 mph

Saturday, Sep 26Sat Sep 26

Mostly sunny 78°/57° 💧 None 💨 8 mph

Sunday, Sep 27Sun Sep 27

Overcast 79°/60° 💧 None 💨 7 mph

Monday, Sep 28Mon Sep 28

Sunny 83°/60° 💧 None 💨 7 mph

Tuesday, Sep 29Tue Sep 29

Mostly sunny 86°/61° 💧 None 💨 7 mph

Wednesday, Sep 30Wed Sep 30

Moderate rain 79°/71° 💧 0.169 in 💨 8 mph

Thursday, Oct 1Thu Oct 1

Moderate rain 71°/67° 💧 0.972 in 💨 14 mph

Friday, Oct 2Fri Oct 2

Moderate rain 77°/66° 💧 0.723 in 💨 9 mph

Saturday, Oct 3Sat Oct 3

Partly cloudy 80°/66° 💧 0.038 in 💨 11 mph

Sunday, Oct 4Sun Oct 4

Mostly sunny 69°/56° 💧 0.332 in 💨 12 mph

Monday, Oct 5Mon Oct 5

Mostly sunny 67°/51° 💧 None 💨 7 mph

Tuesday, Oct 6Tue Oct 6

Mostly sunny 68°/54° 💧 None 💨 6 mph

Wednesday, Oct 7Wed Oct 7

Overcast 62°/56° 💧 None 💨 7 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Castalian Springs

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Castalian Springs

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 10:00 PM

PM2.5 Fine particles Good 6,7µg/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 7,1µg/m³

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

O₃ Ozone Fair 82,2µg/m³

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

NO₂ Nitrogen dioxide Good 2,2µg/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 Castalian Springs

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 7,0High 🙂Fair

Tomorrow UV 6,3High 🙂Fair

Thursday UV 5,6Moderate 🙂Fair

Friday UV 6,9High 🙂Fair

Saturday UV 4,2Moderate 😐Moderate

Sunday UV 6,0High —Unavailable

Monday UV 7,0High —Unavailable

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.

Acceptable air quality

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

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 Castalian Springs

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · CASTALIAN SPRINGS, TENNESSEE

Tonight's Stargazing & Shooting Stars

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

88/100Best-hour score

BEST TIME TONIGHT 1:00 AM–2:00 AM Astronomical darkness: 8:08 PM–5:08 AM

☁ Cloud cover 8% Real hourly forecast for the best viewing hour.

☾ Moonlight 88% Waxing Gibbous · Moon about 23° above the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 44° 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 min37%

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

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

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% 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 Castalian Springs were last refreshed today at 9:17 PM. The current forecast period extends through 24/09/2026 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.