Weather StoryAlmanac, microseasons, and the day's weather story.

Weather in Sweet Grass, Montana

High country wildflowers peak. Day 59 of spring. Read this microseason across nine climate regions →

Sweet Grass, MT
Sunday, May 17 at 1:31 AM
49
°
Overcast
Feels like
36°
Humidity
69%
Wind
24 mph
Sunrise
5:43 AM
Sunset
9:04 PM
Sweet Grass, MT
Hour by hour · 24h
59°
7p
57°
8p
54°
9p
52°
10p
50°
11p
49°
12a
48°
1a
48°
2a
48°
3a
47°
4a
46°
5a
45°
6a
45°
7a
49°
8a
52°
9a
54°
10a
56°
11a
58°
12p
57°
1p
59°
2p
61°
3p
60°
4p
60°
5p
59°
6p
L 45°H 61°
Sweet Grass, MT
7-day forecast
  1. Today
    May 16
    Overcast
    —
    59°40°
  2. Sunday
    May 17
    Heavy Snow
    53%
    40°31°
  3. Monday
    May 18
    Snow
    —
    55°32°
  4. Tuesday
    May 19
    Light Drizzle
    20%
    62°40°
  5. Wednesday
    May 20
    Light Snow Shwrs
    26%
    58°43°
  6. Thursday
    May 21
    Light Drizzle
    19%
    66°43°
  7. Friday
    May 22
    Overcast
    27%
    69°51°
Sweet Grass, MT
Next 24 hours · Cool now
42°53°64°12a6a12p6pnow 59°high 61°low 45°
Sweet Grass, MT
Anemometer · 24h winds · from true
NESW
From · True
NNW
342° · veering 90°
Direction
NNW
342°
Sustained
24
mph
Gust
32
mph
Peak 24h
32
avg 15
Beaufort · 5 · FRESH 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
avg 15 · pk 32 @ 8:00p
−24h−18h−12h−6hnow
Sustained 24 mph with gusts pulsing to 32 — flags snap, branches bend.
Sweet Grass, MT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
887.9
-0.3 mb in 3h · falling · 26.22 inHg
Now
887.9
mb
3h
-0.3
mb
12h
-0.1
mb
24h
-0.2
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 887–889
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Sweet Grass, MT
Air quality
45
AQI
Good
PM 2.5
0.9 μg/m³
PM 10
1.3 μg/m³
NO₂
0.4 μg/m³
Ozone
97.0 μg/m³
UV Index
0.5 Low
Sweet Grass, MT
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
11:07 AM
Sunrise
5:43 AM
Daylight
15h 21m
Sunset
9:04 PM
Civil dusk
3:43 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Sweet Grass, MT
The moon
New Moon
0% illuminated
Moonrise
11:38 AM
Moonset
3:53 AM
In sign
♉︎ Taurus
Sweet Grass, MT
Microseason · 28 of 72
May 16–20

High country wildflowers peak

bird
Jan 137% of the yearDec 31

Read this microseason across nine climate regions →

Sweet Grass at a glance

  • Today vs. normal: 14°F below the seasonal normal for this latitude
  • Last frost: June 9 (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

Cool-season window is open

As of May 17, the cool-season window is open or about to open. Direct-sow peas, lettuce, spinach, radishes, and brassicas now. Hold off on warm-season crops until 1–2 weeks after the last spring frost (around May).

All cities in Montana →

ZIP codes in Sweet Grass

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.