Weather in Longmont, Colorado
High country wildflowers peak. Day 59 of spring. Read this microseason across nine climate regions →
Longmont, CO
Sunday, May 17 at 6:02 AM
61
°
Clear
Feels like
53°
Humidity
44%
Wind
13 mph
Sunrise
5:42 AM
Sunset
8:11 PM
Longmont, CO
Hour by hour · 24h
62°
12a
61°
1a
60°
2a
57°
3a
55°
4a
53°
5a
51°
6a
54°
7a
62°
8a
71°
9a
74°
10a
77°
11a
81°
12p
82°
1p
83°
2p
84°
3p
84°
4p
84°
5p
82°
6p
79°
7p
75°
8p
71°
9p
70°
10p
66°
11p
Longmont, CO
7-day forecast
- TodayMay 17Drizzle39%66°51°
- MondayMay 18Snow99%50°32°
- TuesdayMay 19Drizzle67%50°29°
- WednesdayMay 20Light Drizzle67%67°41°
- ThursdayMay 21Heavy Drizzle46%73°46°
- FridayMay 22Overcast30%76°49°
- SaturdayMay 23Overcast24%77°48°
Longmont, CO
Next 24 hours · Cool now
Longmont, CO
Anemometer · 24h winds · from true
From · True
ENE
059° · veering 41°
Direction
ENE
059°
Sustained
13
mph
Gust
25
mph
Peak 24h
25
avg 7
Beaufort · 4 · MOD BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
−24h−18h−12h−6hnow
Longmont, CO
Air quality
48
AQI
Good
- PM 2.5
- 4.9 μg/m³
- PM 10
- 5.6 μg/m³
- NO₂
- 11.7 μg/m³
- Ozone
- 70.0 μg/m³
- UV Index
- 0.0 Low
Longmont, CO
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
11:14 AM
Sunrise
5:42 AM
Daylight
14h 29m
Sunset
8:11 PM
Civil dusk
2:41 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Longmont, CO
The moon
New Moon
0% illuminated
- Moonrise
- 11:51 AM
- Moonset
- 2:43 AM
- In sign
- ♊︎ Gemini
Longmont, CO
Microseason · 28 of 72
May 16–20
High country wildflowers peak
bird
Longmont at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 17 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Warm-season window is open
As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.