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Current weather in Sweet Grass is broken clouds.

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

Now · 10:51 AM

Sweet Grass Weather & Hourly Forecast

United States · Montana · 59484

69°F

Mostly cloudy

Feels like: 64°F

💧 Humidity 44% 🌡 Pressure 29.83 inHg 💨 Wind 7 mph 👁 Visibility 31.4 mi ☁ Clouds 77% ☀️ UV index 1.4 · Low 🌅 Sunrise 7:13 AM 🌇 Sunset 7:27 PM

Hourly Forecast for Sweet Grass

Today

11:00 AM

Mostly cloudy

69° 💧 None 💨 7 mph H 44%29.83 inHg

2:00 PM

Overcast

77° 💧 None 💨 6 mph H 24%29.80 inHg

5:00 PM

Overcast

76° 💧 None 💨 5 mph H 26%29.77 inHg

8:00 PM

Mostly cloudy night

64° 💧 None 💨 1 mph H 53%29.80 inHg

11:00 PM

Partly cloudy night

56° 💧 None 💨 5 mph H 66%29.83 inHg

Tomorrow

2:00 AM

Mostly cloudy night

54° 💧 None 💨 5 mph H 67%29.85 inHg

5:00 AM

Mostly cloudy night

54° 💧 None 💨 6 mph H 64%29.85 inHg

8:00 AM

Sunny

55° 💧 None 💨 8 mph H 63%29.88 inHg

11:00 AM

Mostly sunny

69° 💧 None 💨 10 mph H 30%29.94 inHg

2:00 PM

Mostly sunny

73° 💧 None 💨 8 mph H 22%29.91 inHg

5:00 PM

Mostly sunny

72° 💧 None 💨 11 mph H 22%29.91 inHg

8:00 PM

Mostly cloudy night

62° 💧 None 💨 6 mph H 40%29.97 inHg

11:00 PM

Clear night

57° 💧 None 💨 7 mph H 52%30.00 inHg

Thursday

2:00 AM

Clear night

53° 💧 None 💨 7 mph H 59%30.00 inHg

5:00 AM

Clear night

49° 💧 None 💨 7 mph H 65%30.03 inHg

8:00 AM

Mostly sunny

51° 💧 None 💨 6 mph H 61%30.03 inHg

Today

11:00 AM

Mostly cloudy

69° 💧 None 💨 7 mph H 44%29.83 inHg

12:00 PM

Overcast

73° 💧 None 💨 6 mph H 35%29.83 inHg

1:00 PM

Overcast

76° 💧 None 💨 6 mph H 27%29.80 inHg

2:00 PM

Overcast

77° 💧 None 💨 6 mph H 24%29.80 inHg

3:00 PM

Overcast

77° 💧 None 💨 6 mph H 23%29.77 inHg

4:00 PM

Overcast

77° 💧 None 💨 5 mph H 24%29.77 inHg

5:00 PM

Overcast

76° 💧 None 💨 5 mph H 26%29.77 inHg

6:00 PM

Mostly cloudy

73° 💧 None 💨 4 mph H 36%29.77 inHg

7:00 PM

Mostly cloudy

67° 💧 None 💨 4 mph H 49%29.77 inHg

8:00 PM

Mostly cloudy night

64° 💧 None 💨 1 mph H 53%29.80 inHg

9:00 PM

Mostly cloudy night

60° 💧 None 💨 3 mph H 56%29.83 inHg

10:00 PM

Mostly cloudy night

58° 💧 None 💨 3 mph H 61%29.83 inHg

11:00 PM

Partly cloudy night

56° 💧 None 💨 5 mph H 66%29.83 inHg

Tomorrow

12:00 AM

Partly cloudy night

56° 💧 None 💨 6 mph H 64%29.83 inHg

1:00 AM

Mostly cloudy night

54° 💧 None 💨 4 mph H 67%29.83 inHg

2:00 AM

Mostly cloudy night

54° 💧 None 💨 5 mph H 67%29.85 inHg

3:00 AM

Mostly cloudy night

53° 💧 None 💨 5 mph H 67%29.85 inHg

4:00 AM

Mostly cloudy night

53° 💧 None 💨 6 mph H 66%29.85 inHg

5:00 AM

Mostly cloudy night

54° 💧 None 💨 6 mph H 64%29.85 inHg

6:00 AM

Clear night

55° 💧 None 💨 7 mph H 61%29.85 inHg

7:00 AM

Clear night

55° 💧 None 💨 7 mph H 63%29.88 inHg

8:00 AM

Sunny

55° 💧 None 💨 8 mph H 63%29.88 inHg

9:00 AM

Sunny

61° 💧 None 💨 9 mph H 54%29.91 inHg

10:00 AM

Mostly sunny

66° 💧 None 💨 9 mph H 42%29.94 inHg

11:00 AM

Mostly sunny

69° 💧 None 💨 10 mph H 30%29.94 inHg

12:00 PM

Mostly sunny

71° 💧 None 💨 9 mph H 26%29.94 inHg

1:00 PM

Mostly sunny

72° 💧 None 💨 9 mph H 24%29.94 inHg

2:00 PM

Mostly sunny

73° 💧 None 💨 8 mph H 22%29.91 inHg

3:00 PM

Mostly sunny

74° 💧 None 💨 9 mph H 22%29.91 inHg

4:00 PM

Mostly sunny

73° 💧 None 💨 10 mph H 22%29.91 inHg

5:00 PM

Mostly sunny

72° 💧 None 💨 11 mph H 22%29.91 inHg

6:00 PM

Partly cloudy

70° 💧 None 💨 9 mph H 27%29.94 inHg

7:00 PM

Mostly cloudy

65° 💧 None 💨 7 mph H 35%29.94 inHg

8:00 PM

Mostly cloudy night

62° 💧 None 💨 6 mph H 40%29.97 inHg

9:00 PM

Mostly cloudy night

60° 💧 None 💨 6 mph H 45%29.97 inHg

10:00 PM

Partly cloudy night

59° 💧 None 💨 7 mph H 49%30.00 inHg

11:00 PM

Clear night

57° 💧 None 💨 7 mph H 52%30.00 inHg

Thursday

12:00 AM

Clear night

55° 💧 None 💨 8 mph H 54%30.00 inHg

1:00 AM

Clear night

54° 💧 None 💨 7 mph H 57%30.00 inHg

2:00 AM

Clear night

53° 💧 None 💨 7 mph H 59%30.00 inHg

3:00 AM

Clear night

53° 💧 None 💨 7 mph H 58%30.00 inHg

4:00 AM

Clear night

51° 💧 None 💨 7 mph H 62%30.03 inHg

5:00 AM

Clear night

49° 💧 None 💨 7 mph H 65%30.03 inHg

6:00 AM

Mostly clear night

49° 💧 None 💨 6 mph H 65%30.03 inHg

7:00 AM

Mostly clear night

49° 💧 None 💨 6 mph H 64%30.03 inHg

8:00 AM

Mostly sunny

51° 💧 None 💨 6 mph H 61%30.03 inHg

9:00 AM

Mostly sunny

56° 💧 None 💨 7 mph H 53%30.03 inHg

10:00 AM

Mostly cloudy

61° 💧 None 💨 6 mph H 46%30.03 inHg

11:00 AM

Partly cloudy

65° 💧 None 💨 7 mph H 39%30.03 inHg

12:00 PM

Mostly sunny

68° 💧 None 💨 8 mph H 35%30.00 inHg

1:00 PM

Partly cloudy

71° 💧 None 💨 9 mph H 34%29.97 inHg

2:00 PM

Mostly sunny

73° 💧 None 💨 10 mph H 34%29.94 inHg

3:00 PM

Mostly sunny

75° 💧 None 💨 11 mph H 33%29.91 inHg

4:00 PM

Sunny

75° 💧 None 💨 12 mph H 34%29.88 inHg

5:00 PM

Sunny

75° 💧 None 💨 12 mph H 35%29.88 inHg

6:00 PM

Sunny

73° 💧 None 💨 10 mph H 38%29.85 inHg

Friday

3:00 AM

Clear night

57° 💧 None 💨 13 mph H 60%29.80 inHg

6:00 AM

Mostly cloudy night

56° 💧 None 💨 15 mph H 66%29.77 inHg

9:00 AM

Partly cloudy

58° 💧 None 💨 16 mph H 63%29.71 inHg

12:00 PM

Mostly sunny

71° 💧 None 💨 16 mph H 42%29.62 inHg

3:00 PM

Partly cloudy

77° 💧 None 💨 14 mph H 33%29.53 inHg

6:00 PM

Partly cloudy

74° 💧 None 💨 8 mph H 42%29.47 inHg

9:00 PM

Partly cloudy night

62° 💧 None 💨 14 mph H 65%29.56 inHg

Saturday

12:00 AM

Light rain

56° 💧 None 💨 12 mph H 70%29.68 inHg

3:00 AM

Clear night

53° 💧 None 💨 16 mph H 58%29.68 inHg

6:00 AM

Mostly clear night

49° 💧 None 💨 19 mph H 60%29.71 inHg

9:00 AM

Mostly sunny

51° 💧 None 💨 14 mph H 57%29.80 inHg

12:00 PM

Partly cloudy

55° 💧 None 💨 17 mph H 48%29.85 inHg

3:00 PM

Sunny

59° 💧 None 💨 18 mph H 39%29.85 inHg

6:00 PM

Sunny

56° 💧 None 💨 19 mph H 41%29.85 inHg

9:00 PM

Clear night

50° 💧 None 💨 16 mph H 52%29.94 inHg

Sunday

12:00 AM

Clear night

47° 💧 None 💨 13 mph H 60%29.97 inHg

3:00 AM

Mostly clear night

43° 💧 None 💨 8 mph H 68%30.00 inHg

6:00 AM

Mostly clear night

39° 💧 None 💨 4 mph H 82%30.03 inHg

9:00 AM

Mostly cloudy

44° 💧 None 💨 5 mph H 73%30.03 inHg

12:00 PM

Overcast

55° 💧 None 💨 1 mph H 44%29.97 inHg

3:00 PM

Mostly cloudy

58° 💧 None 💨 3 mph H 39%29.91 inHg

6:00 PM

Mostly cloudy

56° 💧 None 💨 6 mph H 39%29.88 inHg

9:00 PM

Mostly clear night

48° 💧 None 💨 4 mph H 56%29.88 inHg

Monday

12:00 AM

Partly cloudy night

46° 💧 None 💨 6 mph H 58%29.88 inHg

6:00 AM

Overcast night

46° 💧 None 💨 4 mph H 59%29.97 inHg

12:00 PM

Partly cloudy

43° 💧 None 💨 5 mph H 65%29.97 inHg

6:00 PM

Sunny

60° 💧 None 💨 10 mph H 34%29.91 inHg

Tuesday

12:00 AM

Mostly clear night

64° 💧 None 💨 6 mph H 36%29.80 inHg

6:00 AM

Clear night

51° 💧 None 💨 8 mph H 54%29.83 inHg

12:00 PM

Partly cloudy

47° 💧 None 💨 9 mph H 62%29.80 inHg

6:00 PM

Mostly sunny

65° 💧 None 💨 10 mph H 25%29.80 inHg

Wednesday

12:00 AM

Partly cloudy night

66° 💧 None 💨 9 mph H 26%29.71 inHg

6:00 AM

Mostly clear night

51° 💧 None 💨 8 mph H 46%29.74 inHg

12:00 PM

Mostly sunny

48° 💧 None 💨 10 mph H 52%29.71 inHg

6:00 PM

Partly cloudy

68° 💧 None 💨 9 mph H 32%29.68 inHg

Thursday

12:00 AM

Mostly cloudy night

65° 💧 None 💨 9 mph H 36%29.77 inHg

6:00 AM

Mostly cloudy night

51° 💧 None 💨 5 mph H 62%29.85 inHg

12:00 PM

Mostly cloudy

47° 💧 None 💨 7 mph H 72%29.85 inHg

6:00 PM

Mostly cloudy

62° 💧 None 💨 9 mph H 43%29.80 inHg

Friday

12:00 AM

Mostly cloudy night

66° 💧 None 💨 9 mph H 27%29.77 inHg

6:00 AM

Clear night

50° 💧 None 💨 8 mph H 50%29.91 inHg

12:00 PM

Sunny

42° 💧 None 💨 7 mph H 83%30.00 inHg

6:00 PM

Mostly cloudy

55° 💧 None 💨 2 mph H 57%29.97 inHg

Saturday

12:00 AM

Mostly cloudy night

60° 💧 None 💨 7 mph H 42%29.85 inHg

6:00 AM

Clear night

48° 💧 None 💨 9 mph H 76%29.91 inHg

12:00 PM

Mostly sunny

42° 💧 None 💨 14 mph H 71%30.18 inHg

6:00 PM

Sunny

47° 💧 None 💨 11 mph H 47%30.36 inHg

Sunday

12:00 AM

Mostly cloudy night

49° 💧 None 💨 6 mph H 43%30.30 inHg

6:00 AM

Partly cloudy night

40° 💧 None 💨 3 mph H 64%30.36 inHg

12:00 PM

Partly cloudy

38° 💧 None 💨 13 mph H 70%30.30 inHg

6:00 PM

Mostly sunny

53° 💧 None 💨 15 mph H 43%30.12 inHg

Monday

12:00 AM

Mostly cloudy night

62° 💧 None 💨 12 mph H 37%29.91 inHg

6:00 AM

Overcast night

57° 💧 None 💨 9 mph H 40%29.88 inHg

12:00 PM

Sunny

53° 💧 None 💨 9 mph H 45%29.94 inHg

6:00 PM

Partly cloudy

65° 💧 None 💨 2 mph H 37%30.03 inHg

Tuesday

12:00 AM

Mostly cloudy night

67° 💧 None 💨 6 mph H 38%29.97 inHg

6:00 AM

Partly cloudy night

54° 💧 None 💨 7 mph H 55%30.00 inHg

12:00 PM

Sunny

52° 💧 None 💨 7 mph H 56%30.00 inHg

6:00 PM

Sunny

72° 💧 None 💨 8 mph H 29%29.97 inHg

Wednesday

12:00 AM

Mostly clear night

73° 💧 None 💨 3 mph H 35%29.88 inHg

In Sweet Grass and, more broadly, across the state of Montana: Clear skies are expected tonight with temperatures holding steady around 62 degrees. Light southeast winds will prevail, generally blowing at 3 to 5 mph, with occasional gusts reaching up to 10 mph. No precipitation is forecasted for the evening and the upcoming hours. It will remain a cool and tranquil night, making it a good time to enjoy the clear sky and gentle breeze. Temperatures are unlikely to fluctuate significantly through the evening, providing a calm and comfortable environment.

15-Day Weather Outlook for Sweet Grass

TomorrowTomorrow

Partly cloudy 74°/53° 💧 None 💨 11 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 75°/49° 💧 None 💨 12 mph

Friday, Sep 25Fri Sep 25

Mostly cloudy 77°/56° 💧 0.064 in 💨 16 mph

Saturday, Sep 26Sat Sep 26

Light rain 59°/49° 💧 0.094 in 💨 19 mph

Sunday, Sep 27Sun Sep 27

Mostly sunny 58°/39° 💧 None 💨 13 mph

Monday, Sep 28Mon Sep 28

Partly cloudy 60°/43° 💧 None 💨 10 mph

Tuesday, Sep 29Tue Sep 29

Mostly sunny 65°/47° 💧 None 💨 10 mph

Wednesday, Sep 30Wed Sep 30

Partly cloudy 68°/48° 💧 None 💨 10 mph

Thursday, Oct 1Thu Oct 1

Mostly cloudy 65°/47° 💧 None 💨 9 mph

Friday, Oct 2Fri Oct 2

Mostly cloudy 66°/42° 💧 None 💨 9 mph

Saturday, Oct 3Sat Oct 3

Mostly cloudy 60°/42° 💧 None 💨 14 mph

Sunday, Oct 4Sun Oct 4

Mostly cloudy 53°/38° 💧 None 💨 15 mph

Monday, Oct 5Mon Oct 5

Mostly cloudy 65°/53° 💧 None 💨 12 mph

Tuesday, Oct 6Tue Oct 6

Mostly cloudy 72°/52° 💧 None 💨 8 mph

Wednesday, Oct 7Wed Oct 7

Mostly sunny 73°/73° 💧 None 💨 3 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Sweet Grass

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Sweet Grass

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 11:00 AM

PM2.5 Fine particles Good 1,9µg/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 2,1µg/m³

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

O₃ Ozone Good 54,8µg/m³

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

NO₂ Nitrogen dioxide Good 1,5µg/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 Sweet Grass

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 4,5Moderate 😊Good

Tomorrow UV 3,7Moderate 🙂Fair

Thursday UV 4,0Moderate 🙂Fair

Friday UV 3,5Moderate 😐Moderate

Saturday UV 5,0Moderate 🙂Fair

Sunday UV 4,0Moderate —Unavailable

Monday UV 4,0Moderate —Unavailable

Hourly UV index today

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

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

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.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for Sweet Grass

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · SWEET GRASS, MONTANA

Tonight's Stargazing & Shooting Stars

Fair observing conditions. Best local viewing window: 12:00 AM–1:00 AM.

56/100Best-hour score

BEST TIME TONIGHT 12:00 AM–1:00 AM Astronomical darkness: 9:13 PM–5:29 AM

☁ Cloud cover 52% Real hourly forecast for the best viewing hour.

☾ Moonlight 88% Waxing Gibbous · Moon about 23° above the horizon at the best viewing hour.

☄ Meteor activity Southern Taurids Reference ZHR 7 · Radiant 23° high at the best hour.

✦ Estimated visible meteors 0–1/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min15%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

ACTIVE NOW

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

NOV 6–NOV 30

LeonidsStart NOV 6 · Peak NOV 17 · End NOV 30 · ZHR 15 · 52% 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 Sweet Grass were last refreshed today at 10:51 AM. The current forecast period extends through 24/09/2026 at 8:00 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.