🇺🇸 Weather in Longmont
Map Overlays:
Hourly Forecast for Longmont
02:00
16°
1%
03:00
15°
3%
04:00
14°
4%
05:00
15°
3%
06:00
13°
4%
07:00
12°
5%
08:00
14°
4%
09:00
16°
14%
10:00
18°
13%
11:00
21°
10%
12:00
24°
9%
13:00
26°
9%
14:00
27°
2%
15:00
29°
18%
16:00
30°
9%
17:00
30°
17%
18:00
24°
8%
19:00
22°
2%
20:00
20°
3%
21:00
19°
3%
22:00
18°
4%
23:00
17°
13%
00:00
16°
15%
01:00
15°
13%
14-Day Forecast for Longmont
2026-09-12
Sunny
30° /
12°
2026-09-13
Sunny
36° /
11°
2026-09-14
Overcast
31° /
17°
2026-09-15
Sunny
28° /
12°
2026-09-16
Overcast
28° /
13°
2026-09-17
Overcast
20° /
10°
2026-09-18
Sunny
24° /
7°
Additional Forecasts for Longmont
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 186.0 μg/m³
O₃ (Ozone) 25.0 μg/m³
NO₂ (Nitrogen Dioxide) 16.0 μg/m³
SO₂ (Sulphur Dioxide) 0.3 μg/m³
PM2.5 (Fine particles) 3.8 μg/m³
PM10 (Coarse particles) 4.1 μg/m³
Historical Weather
Weather Forecasts for Other Cities in United States
Weather in Longmont — FAQ
Answers refreshed each request based on current conditions in Longmont.
What is the weather like right now in Longmont?
Right now in Longmont, United States the temperature is 15.9°C (feels like 12.2°C), with clear. Relative humidity is 42% and wind is 11.5 km/h.
What is today's high and low temperature in Longmont?
Today's forecast high in Longmont is 29.9°C and the overnight low is 12.4°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Longmont today?
The chance of precipitation in Longmont today is 36%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Longmont differ from nearby cities?
Even short distances can change temperatures noticeably. Longmont's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.