Live Weather & Forecast

Weather in Longmont

Q: What is the current weather in Longmont?

Current conditions in Longmont: Clear, temperature 16°C, humidity 17%.

Q: What is the best time to visit Longmont?

The best time to visit Longmont is typically June – September. Warm, dry summers — ideal for outdoor activities.

Q: What are the GPS coordinates used for the weather forecast in Longmont?

The weather forecast for Longmont uses coordinates 40.1672, -105.1019.

Colorado, United States · Real-time conditions & 3-day outlook

16^°C

Feels like 16°C

60°F / Feels 60°F

Clear

Longmont, Colorado

🌙 Nighttime

Updated: 2026-04-12 23:15

💧

Humidity

17%

💨

Wind

11.2 km/h WSW

🌬️

Wind Gust

23.4 km/h

🌡️

Pressure

1009 mb

👁️

Visibility

16 km

☀️

UV Index

0 (Low)

🌧️

Precipitation

0 mm

☁️

Cloud Cover

💦

Dew Point

-8.8°C

🌐

Wind Degree

243°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)

142.9 μg/m³

NO₂

6.5 μg/m³

O₃

79 μg/m³

SO₂

1.5 μg/m³

PM 2.5

3 μg/m³

PM 10

3.6 μg/m³

Weather Alerts 3

Met · Severe · Expected

Red Flag Warning issued April 12 at 11:50AM MDT until April 12 at 8:00PM MDT by NWS Denver CO

...TODAY'S RED FLAG WARNING REMAINS IN EFFECT AND UNCHANGED UNTIL 8 PM MDT THIS EVENING... .ALL ZONES IN MONDAY'S FIRE WEATHER WATCH HAVE BEEN UPGRADED TO A RED FLAG WARNING EXCEPT FOR WASHINGTON COUNTY WHERE WINDS WILL BE MORE MARGINAL. The National Weather Service in Denver has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 11 AM to 8 PM MDT Monday. The F...

A Red Flag Warning means that critical fire weather conditions are either occurring now....or will shortly. A combination of strong winds...low relative humidity...and warm temperatures can contribute to extreme fire behavior.

Effective: 2026-04-12T11:50:00-06:00 · Expires: 2026-04-13T06:15:00-06:00

Met · Severe · Expected

Red Flag Warning issued April 12 at 11:50AM MDT until April 13 at 8:00PM MDT by NWS Denver CO

Effective: 2026-04-12T11:50:00-06:00 · Expires: 2026-04-13T06:15:00-06:00

Met · Severe · Expected

Red Flag Warning issued April 12 at 11:50AM MDT until April 13 at 8:00PM MDT by NWS Denver CO

Effective: 2026-04-12T11:50:00-06:00 · Expires: 2026-04-13T06:15:00-06:00

Today's Hourly Forecast

24-hour breakdown for Longmont, Colorado

12 AM

10°

Clear

💧 54% 💨 10.8 km/h

1 AM

9°

Overcast

💧 55% 💨 11.2 km/h

2 AM

8°

Partly Cloudy

💧 56% 💨 9.7 km/h

3 AM

7°

Clear

💧 61% 💨 10.4 km/h

4 AM

6°

Clear

💧 65% 💨 10.1 km/h

5 AM

5°

Clear

💧 69% 💨 10.8 km/h

6 AM

4°

Clear

💧 72% 💨 11.2 km/h

7 AM

6°

Sunny

💧 71% 💨 11.5 km/h

8 AM

10°

Sunny

💧 57% 💨 15.5 km/h

9 AM

14°

Sunny

💧 28% 💨 18.7 km/h

10 AM

18°

Sunny

💧 23% 💨 20.9 km/h

11 AM

21°

Sunny

💧 21% 💨 18 km/h

12 PM

22°

Sunny

💧 19% 💨 14 km/h

1 PM

22°

Sunny

💧 18% 💨 16.9 km/h

2 PM

22°

Sunny

💧 16% 💨 6.5 km/h

3 PM

22°

Sunny

💧 14% 💨 5.8 km/h

4 PM

22°

Sunny

💧 14% 💨 14.8 km/h

5 PM

22°

Sunny

💧 14% 💨 19.1 km/h

6 PM

21°

Sunny

💧 14% 💨 27.7 km/h

7 PM

19°

Sunny

💧 18% 💨 24.5 km/h

8 PM

17°

Clear

💧 18% 💨 16.9 km/h

9 PM

14°

Clear

💧 19% 💨 19.8 km/h

10 PM

13°

Clear

💧 22% 💨 15.1 km/h

11 PM

16°

Clear

💧 17% 💨 11.2 km/h

3-Day Forecast

Daily overview for Longmont, Colorado

Today

Sunny

24° / 4°

🌧️ 0% chance of rain

💧 Avg. humidity: 35%

💨 Max wind: 27.7 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 1.8

🌅 Sunrise: 06:26 AM

🌇 Sunset: 07:37 PM

🌙 Waning Crescent

🌑 Moon: 33% lit

Mon, Apr 13

Sunny

23° / 4°

🌧️ 0% chance of rain

💧 Avg. humidity: 29%

💨 Max wind: 31.3 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 1.8

🌅 Sunrise: 06:25 AM

🌇 Sunset: 07:38 PM

🌙 Waning Crescent

🌑 Moon: 23% lit

Tue, Apr 14

Overcast

12° / 7°

🌧️ 0% chance of rain

💧 Avg. humidity: 42%

💨 Max wind: 29.2 km/h

🌧️ Total precip: 0 mm

☀️ UV Index: 1.3

🌅 Sunrise: 06:23 AM

🌇 Sunset: 07:39 PM

🌙 Waning Crescent

🌑 Moon: 15% lit

Best Time to Visit Longmont

Plan your trip to Longmont, United States around the most favorable weather conditions.

Peak Season

June – September

Warm, dry summers — ideal for outdoor activities.

Shoulder Season

April – May, October

Fewer crowds, moderate prices, mild weather.

Off Season

November – March

Cooler temperatures; some regions may experience rain or snow.

← Back to Longmont 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Longmont?

Current conditions in Longmont: Clear, temperature 16°C, humidity 17%.

What is the best time to visit Longmont?

The best time to visit Longmont is typically June – September. Warm, dry summers — ideal for outdoor activities.

What is the climate like in Longmont?

Longmont is located at approximately 40.2° latitude. It has a temperate climate with warm summers and cold winters.

Does it rain a lot in Longmont?

The wettest period in Longmont is typically during November – March. Cooler temperatures; some regions may experience rain or snow.

What should I pack for a trip to Longmont?

For visits to Longmont during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.

What country is Longmont in?

Longmont is located in United States, in the state of Colorado.

What are the public holidays in Longmont in 2026?

View the 2026 public holidays for Longmont on our Holidays page.

What are the GPS coordinates used for the weather forecast in Longmont?

The weather forecast for Longmont uses coordinates 40.1672, -105.1019.