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Current weather in Longmont is broken clouds.

Where can I find the hourly weather forecast for Longmont?

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

Is the weather forecast for Longmont updated regularly?

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

Now · 3:03 AM

Longmont Weather & Hourly Forecast

United States · Colorado · 80501

65°F

Mostly cloudy night

Feels like: 65°F

💧 Humidity 67% 🌡 Pressure 29.91 inHg 💨 Wind 2 mph 👁 Visibility 27.5 mi ☁ Clouds 83% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Longmont

Today

4:00 AM

Mostly cloudy night

64° 💧 None 💨 2 mph H 68%29.94 inHg

7:00 AM

Mostly sunny

63° 💧 None 💨 1 mph H 68%30.03 inHg

10:00 AM

Sunny

77° 💧 0.003 in 💨 4 mph H 36%30.03 inHg

1:00 PM

Partly cloudy

84° 💧 0.013 in 💨 5 mph H 22%29.97 inHg

4:00 PM

Mostly sunny

83° 💧 0.014 in 💨 3 mph H 25%29.94 inHg

7:00 PM

Sunny

78° 💧 0.001 in 💨 8 mph H 38%29.97 inHg

10:00 PM

Clear night

71° 💧 None 💨 5 mph H 54%30.03 inHg

Tomorrow

1:00 AM

Clear night

66° 💧 None 💨 2 mph H 67%30.03 inHg

4:00 AM

Clear night

61° 💧 None 💨 3 mph H 68%30.06 inHg

7:00 AM

Sunny

60° 💧 None 💨 1 mph H 55%30.18 inHg

10:00 AM

Sunny

70° 💧 None 💨 3 mph H 28%30.24 inHg

1:00 PM

Sunny

79° 💧 None 💨 4 mph H 21%30.12 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 5 mph H 18%30.03 inHg

7:00 PM

Mostly sunny

78° 💧 None 💨 5 mph H 21%30.03 inHg

10:00 PM

Clear night

67° 💧 None 💨 2 mph H 41%30.09 inHg

Thursday

1:00 AM

Clear night

63° 💧 None 💨 2 mph H 54%30.09 inHg

Today

4:00 AM

Mostly cloudy night

64° 💧 None 💨 2 mph H 68%29.94 inHg

5:00 AM

Mostly cloudy night

64° 💧 None 💨 2 mph H 67%29.97 inHg

6:00 AM

Mostly cloudy night

63° 💧 None 💨 1 mph H 67%30.00 inHg

7:00 AM

Mostly sunny

63° 💧 None 💨 1 mph H 68%30.03 inHg

8:00 AM

Partly cloudy

67° 💧 None 💨 3 mph H 59%30.03 inHg

9:00 AM

Mostly sunny

73° 💧 None 💨 3 mph H 46%30.03 inHg

10:00 AM

Sunny

77° 💧 0.000 in 💨 4 mph H 36%30.03 inHg

11:00 AM

Mostly sunny

81° 💧 None 💨 6 mph H 26%30.00 inHg

12:00 PM

Mostly sunny

83° 💧 0.003 in 💨 6 mph H 23%29.97 inHg

1:00 PM

Partly cloudy

84° 💧 0.003 in 💨 5 mph H 22%29.97 inHg

2:00 PM

Partly cloudy

85° 💧 0.003 in 💨 7 mph H 22%29.94 inHg

3:00 PM

Light rain

85° 💧 0.006 in 💨 5 mph H 23%29.94 inHg

4:00 PM

Mostly sunny

83° 💧 0.003 in 💨 3 mph H 25%29.94 inHg

5:00 PM

Light rain

83° 💧 0.011 in 💨 2 mph H 26%29.94 inHg

6:00 PM

Mostly sunny

82° 💧 None 💨 4 mph H 29%29.94 inHg

7:00 PM

Sunny

78° 💧 0.001 in 💨 8 mph H 38%29.97 inHg

8:00 PM

Clear night

74° 💧 0.000 in 💨 5 mph H 47%29.97 inHg

9:00 PM

Clear night

73° 💧 None 💨 6 mph H 51%30.00 inHg

10:00 PM

Clear night

71° 💧 None 💨 5 mph H 54%30.03 inHg

11:00 PM

Clear night

69° 💧 None 💨 2 mph H 58%30.03 inHg

Tomorrow

12:00 AM

Clear night

67° 💧 None 💨 3 mph H 64%30.03 inHg

1:00 AM

Clear night

66° 💧 None 💨 2 mph H 67%30.03 inHg

2:00 AM

Clear night

62° 💧 None 💨 3 mph H 74%30.03 inHg

3:00 AM

Clear night

61° 💧 None 💨 5 mph H 75%30.03 inHg

4:00 AM

Clear night

61° 💧 None 💨 3 mph H 68%30.06 inHg

5:00 AM

Clear night

59° 💧 None 💨 1 mph H 67%30.09 inHg

6:00 AM

Clear night

58° 💧 None 💨 1 mph H 63%30.12 inHg

7:00 AM

Sunny

60° 💧 None 💨 1 mph H 55%30.18 inHg

8:00 AM

Sunny

64° 💧 None 💨 1 mph H 42%30.24 inHg

9:00 AM

Sunny

66° 💧 None 💨 2 mph H 33%30.24 inHg

10:00 AM

Sunny

70° 💧 None 💨 3 mph H 28%30.24 inHg

11:00 AM

Sunny

73° 💧 None 💨 4 mph H 24%30.21 inHg

12:00 PM

Sunny

76° 💧 None 💨 5 mph H 22%30.18 inHg

1:00 PM

Sunny

79° 💧 None 💨 4 mph H 21%30.12 inHg

2:00 PM

Sunny

81° 💧 None 💨 4 mph H 19%30.09 inHg

3:00 PM

Mostly sunny

82° 💧 None 💨 5 mph H 18%30.06 inHg

4:00 PM

Mostly sunny

83° 💧 None 💨 5 mph H 18%30.03 inHg

5:00 PM

Partly cloudy

83° 💧 None 💨 5 mph H 18%30.00 inHg

6:00 PM

Mostly sunny

82° 💧 None 💨 5 mph H 18%30.00 inHg

7:00 PM

Mostly sunny

78° 💧 None 💨 5 mph H 21%30.03 inHg

8:00 PM

Clear night

74° 💧 None 💨 2 mph H 28%30.03 inHg

9:00 PM

Clear night

70° 💧 None 💨 0 mph H 32%30.09 inHg

10:00 PM

Clear night

67° 💧 None 💨 2 mph H 41%30.09 inHg

11:00 PM

Clear night

65° 💧 None 💨 2 mph H 49%30.09 inHg

Thursday

12:00 AM

Clear night

64° 💧 None 💨 1 mph H 50%30.09 inHg

1:00 AM

Clear night

63° 💧 None 💨 2 mph H 54%30.09 inHg

2:00 AM

Clear night

60° 💧 None 💨 2 mph H 58%30.09 inHg

3:00 AM

Clear night

57° 💧 None 💨 3 mph H 62%30.09 inHg

4:00 AM

Clear night

56° 💧 None 💨 3 mph H 61%30.09 inHg

5:00 AM

Clear night

54° 💧 None 💨 2 mph H 60%30.09 inHg

6:00 AM

Clear night

52° 💧 None 💨 3 mph H 60%30.09 inHg

7:00 AM

Sunny

51° 💧 None 💨 2 mph H 59%30.09 inHg

8:00 AM

Sunny

57° 💧 None 💨 2 mph H 49%30.09 inHg

9:00 AM

Sunny

67° 💧 None 💨 1 mph H 28%30.09 inHg

10:00 AM

Sunny

72° 💧 None 💨 2 mph H 25%30.06 inHg

11:00 AM

Sunny

78° 💧 None 💨 3 mph H 19%30.00 inHg

12:00 PM

Sunny

83° 💧 None 💨 6 mph H 15%29.94 inHg

1:00 PM

Sunny

87° 💧 None 💨 7 mph H 10%29.88 inHg

2:00 PM

Partly cloudy

89° 💧 0.000 in 💨 6 mph H 8%29.83 inHg

3:00 PM

Mostly sunny

91° 💧 None 💨 5 mph H 8%29.77 inHg

4:00 PM

Sunny

91° 💧 None 💨 5 mph H 7%29.74 inHg

5:00 PM

Sunny

90° 💧 None 💨 4 mph H 7%29.71 inHg

6:00 PM

Sunny

89° 💧 None 💨 5 mph H 7%29.71 inHg

9:00 PM

Clear night

76° 💧 None 💨 1 mph H 15%29.77 inHg

Friday

12:00 AM

Clear night

69° 💧 None 💨 5 mph H 47%29.80 inHg

3:00 AM

Mostly clear night

59° 💧 None 💨 2 mph H 52%29.77 inHg

6:00 AM

Mostly clear night

57° 💧 None 💨 1 mph H 55%29.80 inHg

9:00 AM

Partly cloudy

70° 💧 None 💨 3 mph H 28%29.77 inHg

12:00 PM

Partly cloudy

89° 💧 None 💨 4 mph H 10%29.65 inHg

3:00 PM

Partly cloudy

96° 💧 None 💨 17 mph H 9%29.53 inHg

6:00 PM

Mostly sunny

90° 💧 None 💨 12 mph H 14%29.53 inHg

9:00 PM

Clear night

81° 💧 None 💨 7 mph H 18%29.62 inHg

Saturday

12:00 AM

Clear night

71° 💧 None 💨 2 mph H 32%29.71 inHg

3:00 AM

Clear night

65° 💧 None 💨 16 mph H 44%29.91 inHg

6:00 AM

Clear night

59° 💧 None 💨 4 mph H 60%30.03 inHg

9:00 AM

Partly cloudy

62° 💧 None 💨 4 mph H 47%30.09 inHg

12:00 PM

Mostly cloudy

71° 💧 None 💨 6 mph H 35%30.03 inHg

3:00 PM

Partly cloudy

78° 💧 None 💨 6 mph H 28%29.91 inHg

6:00 PM

Partly cloudy

78° 💧 None 💨 8 mph H 26%29.85 inHg

9:00 PM

Mostly clear night

70° 💧 None 💨 7 mph H 34%29.91 inHg

Sunday

12:00 AM

Partly cloudy night

66° 💧 None 💨 5 mph H 46%29.88 inHg

3:00 AM

Mostly clear night

61° 💧 None 💨 1 mph H 61%29.83 inHg

6:00 AM

Mostly clear night

58° 💧 None 💨 4 mph H 67%29.83 inHg

9:00 AM

Mostly sunny

67° 💧 None 💨 1 mph H 48%29.83 inHg

12:00 PM

Partly cloudy

83° 💧 None 💨 2 mph H 29%29.71 inHg

3:00 PM

Partly cloudy

91° 💧 None 💨 5 mph H 20%29.59 inHg

6:00 PM

Partly cloudy

89° 💧 None 💨 3 mph H 21%29.56 inHg

Monday

12:00 AM

Mostly clear night

72° 💧 None 💨 12 mph H 36%29.77 inHg

6:00 AM

Clear night

63° 💧 None 💨 4 mph H 35%29.88 inHg

12:00 PM

Mostly sunny

77° 💧 None 💨 8 mph H 19%29.88 inHg

6:00 PM

Mostly sunny

82° 💧 None 💨 10 mph H 19%29.80 inHg

Tuesday

12:00 AM

Mostly clear night

64° 💧 None 💨 4 mph H 58%30.03 inHg

6:00 AM

Clear night

58° 💧 None 💨 6 mph H 74%30.06 inHg

12:00 PM

Mostly sunny

76° 💧 None 💨 3 mph H 39%30.00 inHg

6:00 PM

Light rain

80° 💧 None 💨 4 mph H 44%29.88 inHg

Wednesday

12:00 AM

Clear night

66° 💧 None 💨 2 mph H 70%29.94 inHg

6:00 AM

Clear night

60° 💧 None 💨 4 mph H 75%30.03 inHg

12:00 PM

Sunny

85° 💧 None 💨 4 mph H 33%30.00 inHg

6:00 PM

Mostly sunny

84° 💧 None 💨 5 mph H 29%29.94 inHg

Thursday

12:00 AM

Clear night

65° 💧 None 💨 3 mph H 90%30.09 inHg

6:00 AM

Mostly clear night

61° 💧 None 💨 3 mph H 83%30.18 inHg

12:00 PM

Light rain

72° 💧 None 💨 7 mph H 74%30.30 inHg

6:00 PM

Light rain

66° 💧 None 💨 5 mph H 92%30.36 inHg

Friday

12:00 AM

Light rain

63° 💧 None 💨 8 mph H 97%30.42 inHg

6:00 AM

Overcast night

61° 💧 None 💨 9 mph H 94%30.39 inHg

12:00 PM

Mostly cloudy

69° 💧 None 💨 9 mph H 75%30.27 inHg

6:00 PM

Mostly cloudy

73° 💧 None 💨 4 mph H 70%30.09 inHg

Saturday

12:00 AM

Partly cloudy night

63° 💧 None 💨 1 mph H 97%30.06 inHg

6:00 AM

Mostly clear night

59° 💧 None 💨 1 mph H 96%30.00 inHg

12:00 PM

Mostly sunny

82° 💧 None 💨 7 mph H 44%29.88 inHg

6:00 PM

Mostly cloudy

79° 💧 None 💨 1 mph H 53%29.83 inHg

Sunday

12:00 AM

Partly cloudy night

63° 💧 None 💨 3 mph H 90%29.91 inHg

6:00 AM

Light rain

59° 💧 None 💨 12 mph H 62%30.06 inHg

12:00 PM

Mostly cloudy

65° 💧 None 💨 2 mph H 38%30.18 inHg

6:00 PM

Moderate rain

57° 💧 None 💨 3 mph H 84%30.18 inHg

Monday

12:00 AM

Light rain

56° 💧 None 💨 1 mph H 91%30.27 inHg

6:00 AM

Light rain

55° 💧 None 💨 2 mph H 92%30.30 inHg

12:00 PM

Overcast

58° 💧 None 💨 6 mph H 72%30.39 inHg

6:00 PM

Partly cloudy

61° 💧 None 💨 7 mph H 58%30.30 inHg

Tuesday

12:00 AM

Clear night

50° 💧 None 💨 2 mph H 93%30.30 inHg

6:00 AM

Mostly clear night

47° 💧 None 💨 1 mph H 93%30.30 inHg

12:00 PM

Sunny

65° 💧 None 💨 3 mph H 55%30.18 inHg

6:00 PM

Partly cloudy

68° 💧 None 💨 1 mph H 54%30.06 inHg

In Longmont and, more broadly, across the state of Colorado: The evening will be characterized by mostly cloudy skies with mild temperatures holding steady around 74 degrees. Light westward winds are expected, with speeds reaching up to 6 mph and gusts up to 7 mph. No precipitation is anticipated during this period, so conditions will remain dry. The relatively calm wind and stable temperature should provide a comfortable evening. As the night progresses, skies may remain partly cloudy, but no significant weather events are forecast. Overall, it looks like a quiet and mild evening with little change expected in the next few hours.

15-Day Weather Outlook for Longmont

TomorrowTomorrow

Light thunderstorms 79°/57° 💧 None 💨 6 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 90°/51° 💧 0.085 in 💨 8 mph

Friday, Sep 11Fri Sep 11

Partly cloudy 96°/55° 💧 None 💨 10 mph

Saturday, Sep 12Sat Sep 12

Mostly cloudy 92°/60° 💧 0.006 in 💨 15 mph

Sunday, Sep 13Sun Sep 13

Mostly sunny 80°/58° 💧 0.001 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Mostly sunny 92°/60° 💧 0.191 in 💨 8 mph

Tuesday, Sep 15Tue Sep 15

Sunny 80°/55° 💧 None 💨 13 mph

Wednesday, Sep 16Wed Sep 16

Mostly sunny 85°/59° 💧 None 💨 5 mph

Thursday, Sep 17Thu Sep 17

Partly cloudy 87°/67° 💧 0.014 in 💨 11 mph

Friday, Sep 18Fri Sep 18

Mostly cloudy 87°/64° 💧 0.055 in 💨 10 mph

Saturday, Sep 19Sat Sep 19

Light rain 78°/62° 💧 0.142 in 💨 6 mph

Sunday, Sep 20Sun Sep 20

Mostly sunny 78°/61° 💧 0.034 in 💨 3 mph

Monday, Sep 21Mon Sep 21

Mostly sunny 78°/56° 💧 0.035 in 💨 5 mph

Tuesday, Sep 22Tue Sep 22

Mostly sunny 84°/60° 💧 0.002 in 💨 7 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Longmont

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Longmont

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 4:00 AM

PM2.5 Fine particles Good 0,5µg/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 0,5µg/m³

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

O₃ Ozone Good 15,7µg/m³

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

NO₂ Nitrogen dioxide Good 2,7µg/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 Longmont

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 8,8Very high 😊Good

Tomorrow UV 8,7Very high 🙂Fair

Thursday UV 7,7High 🙂Fair

Friday UV 7,1High 🙂Fair

Saturday UV 7,0High 😊Good

Sunday UV 7,0High —Unavailable

Monday UV 6,0High —Unavailable

Hourly UV index today

7:00 AMUV 0,0 8:00 AMUV 0,5 9:00 AMUV 1,7 10:00 AMUV 3,4 11:00 AMUV 5,9 12:00 PMUV 8,0 1:00 PMUV 8,8 2:00 PMUV 8,0 3:00 PMUV 5,0 4:00 PMUV 3,5 5:00 PMUV 1,9 6:00 PMUV 0,6

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

Very high UV risk

Use SPF 50+ sunscreen, a hat and sunglasses. Seek shade and limit exposure around midday.

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.

Best in the morning or late in the day

For walking, running or cycling, prefer the early morning or late afternoon.

WIND OUTLOOK

Hourly Wind Forecast for Longmont

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · LONGMONT, COLORADO

Tonight's Stargazing & Shooting Stars

Local night-sky conditions and meteor activity for Jasper.

41/100Best-hour score

No good viewing window tonight Astronomical darkness exists, but current sky conditions are unfavorable.

☁ Cloud cover 81% Real hourly forecast for the best viewing hour.

☾ Moonlight 13% Waning Crescent · Moon about 3° above the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 78° high at the best hour.

✦ Estimated visible meteors Poor visibility Meteor activity may occur above the clouds, but local viewing conditions are not suitable.

Chance ≥1 meteor in 30 minNot meaningful

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 Longmont were last refreshed today at 3:03 AM. The current forecast period extends through 10/09/2026 at 1:00 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.