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Current weather in Grass Range is few clouds.

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Is the weather forecast for Grass Range updated regularly?

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

Now · 12:21 PM

Grass Range Weather & Hourly Forecast

United States · Montana · 59032

65°F

Mostly sunny

Feels like: 55°F

💧 Humidity 44% 🌡 Pressure 30.06 inHg 💨 Wind 16 mph 👁 Visibility 30.9 mi ☁ Clouds 22% ☀️ UV index 5.1 · Moderate 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for Grass Range

Today

1:00 PM

Mostly sunny

66° 💧 0.003 in 💨 15 mph H 43%30.06 inHg

4:00 PM

Strong thunderstorm

67° 💧 0.010 in 💨 13 mph H 40%30.06 inHg

7:00 PM

Mostly cloudy

59° 💧 0.000 in 💨 11 mph H 57%30.12 inHg

10:00 PM

Clear night

55° 💧 None 💨 11 mph H 64%30.21 inHg

Tomorrow

1:00 AM

Clear night

54° 💧 None 💨 11 mph H 58%30.18 inHg

4:00 AM

Clear night

54° 💧 None 💨 10 mph H 52%30.18 inHg

7:00 AM

Sunny

53° 💧 None 💨 9 mph H 49%30.18 inHg

10:00 AM

Sunny

65° 💧 None 💨 13 mph H 33%30.15 inHg

1:00 PM

Sunny

71° 💧 None 💨 14 mph H 29%30.09 inHg

4:00 PM

Sunny

73° 💧 None 💨 13 mph H 26%30.03 inHg

7:00 PM

Sunny

68° 💧 None 💨 7 mph H 35%30.00 inHg

10:00 PM

Clear night

62° 💧 None 💨 10 mph H 40%30.00 inHg

Thursday

1:00 AM

Clear night

61° 💧 0.000 in 💨 9 mph H 38%29.97 inHg

4:00 AM

Mostly clear night

57° 💧 None 💨 7 mph H 44%29.88 inHg

7:00 AM

Partly cloudy

59° 💧 None 💨 7 mph H 35%29.85 inHg

10:00 AM

Partly cloudy

74° 💧 None 💨 14 mph H 22%29.80 inHg

Today

1:00 PM

Mostly sunny

66° 💧 None 💨 15 mph H 43%30.06 inHg

2:00 PM

Mostly sunny

67° 💧 0.000 in 💨 14 mph H 41%30.03 inHg

3:00 PM

Sunny

67° 💧 0.003 in 💨 13 mph H 40%30.06 inHg

4:00 PM

Strong thunderstorm

67° 💧 0.001 in 💨 13 mph H 40%30.06 inHg

5:00 PM

Partly cloudy

65° 💧 0.003 in 💨 15 mph H 39%30.09 inHg

6:00 PM

Light rain

60° 💧 0.006 in 💨 14 mph H 52%30.12 inHg

7:00 PM

Mostly cloudy

59° 💧 0.000 in 💨 11 mph H 57%30.12 inHg

8:00 PM

Mostly clear night

56° 💧 None 💨 10 mph H 61%30.15 inHg

9:00 PM

Mostly clear night

55° 💧 None 💨 10 mph H 64%30.18 inHg

10:00 PM

Clear night

55° 💧 None 💨 11 mph H 64%30.21 inHg

11:00 PM

Clear night

54° 💧 None 💨 11 mph H 63%30.21 inHg

Tomorrow

12:00 AM

Clear night

54° 💧 None 💨 11 mph H 61%30.18 inHg

1:00 AM

Clear night

54° 💧 None 💨 11 mph H 58%30.18 inHg

2:00 AM

Clear night

54° 💧 None 💨 11 mph H 56%30.18 inHg

3:00 AM

Clear night

54° 💧 None 💨 10 mph H 54%30.18 inHg

4:00 AM

Clear night

54° 💧 None 💨 10 mph H 52%30.18 inHg

5:00 AM

Clear night

53° 💧 None 💨 10 mph H 51%30.18 inHg

6:00 AM

Clear night

53° 💧 None 💨 10 mph H 51%30.18 inHg

7:00 AM

Sunny

53° 💧 None 💨 9 mph H 49%30.18 inHg

8:00 AM

Sunny

57° 💧 None 💨 10 mph H 44%30.18 inHg

9:00 AM

Sunny

62° 💧 None 💨 9 mph H 40%30.18 inHg

10:00 AM

Sunny

65° 💧 None 💨 13 mph H 33%30.15 inHg

11:00 AM

Sunny

67° 💧 None 💨 13 mph H 31%30.15 inHg

12:00 PM

Sunny

69° 💧 None 💨 13 mph H 30%30.12 inHg

1:00 PM

Sunny

71° 💧 None 💨 14 mph H 29%30.09 inHg

2:00 PM

Sunny

72° 💧 None 💨 14 mph H 27%30.06 inHg

3:00 PM

Sunny

73° 💧 None 💨 14 mph H 27%30.06 inHg

4:00 PM

Sunny

73° 💧 None 💨 13 mph H 26%30.03 inHg

5:00 PM

Sunny

73° 💧 None 💨 12 mph H 25%30.03 inHg

6:00 PM

Sunny

71° 💧 None 💨 11 mph H 28%30.00 inHg

7:00 PM

Sunny

68° 💧 None 💨 7 mph H 35%30.00 inHg

8:00 PM

Clear night

63° 💧 None 💨 8 mph H 39%30.00 inHg

9:00 PM

Clear night

62° 💧 None 💨 9 mph H 40%30.00 inHg

10:00 PM

Clear night

62° 💧 None 💨 10 mph H 40%30.00 inHg

11:00 PM

Clear night

61° 💧 None 💨 8 mph H 41%30.00 inHg

Thursday

12:00 AM

Clear night

60° 💧 None 💨 8 mph H 42%29.97 inHg

1:00 AM

Clear night

61° 💧 None 💨 9 mph H 38%29.97 inHg

2:00 AM

Clear night

61° 💧 0.000 in 💨 9 mph H 36%29.94 inHg

3:00 AM

Mostly clear night

58° 💧 None 💨 6 mph H 41%29.91 inHg

4:00 AM

Mostly clear night

57° 💧 None 💨 7 mph H 44%29.88 inHg

5:00 AM

Partly cloudy night

59° 💧 None 💨 8 mph H 40%29.88 inHg

6:00 AM

Partly cloudy night

59° 💧 None 💨 7 mph H 37%29.85 inHg

7:00 AM

Partly cloudy

59° 💧 None 💨 7 mph H 35%29.85 inHg

8:00 AM

Partly cloudy

63° 💧 None 💨 9 mph H 31%29.83 inHg

9:00 AM

Partly cloudy

70° 💧 None 💨 12 mph H 25%29.83 inHg

10:00 AM

Partly cloudy

74° 💧 None 💨 14 mph H 22%29.80 inHg

11:00 AM

Mostly sunny

77° 💧 None 💨 16 mph H 20%29.77 inHg

12:00 PM

Sunny

79° 💧 None 💨 16 mph H 19%29.77 inHg

1:00 PM

Sunny

80° 💧 None 💨 15 mph H 19%29.74 inHg

2:00 PM

Mostly sunny

81° 💧 None 💨 13 mph H 18%29.71 inHg

3:00 PM

Mostly sunny

82° 💧 None 💨 12 mph H 18%29.68 inHg

4:00 PM

Partly cloudy

82° 💧 None 💨 11 mph H 18%29.65 inHg

5:00 PM

Mostly cloudy

81° 💧 None 💨 11 mph H 18%29.62 inHg

6:00 PM

Mostly cloudy

80° 💧 None 💨 9 mph H 21%29.62 inHg

7:00 PM

Mostly cloudy

74° 💧 None 💨 4 mph H 33%29.62 inHg

8:00 PM

Partly cloudy night

68° 💧 None 💨 4 mph H 36%29.62 inHg

9:00 PM

Partly cloudy night

66° 💧 None 💨 6 mph H 38%29.65 inHg

10:00 PM

Mostly cloudy night

65° 💧 None 💨 8 mph H 41%29.68 inHg

11:00 PM

Mostly cloudy night

64° 💧 None 💨 7 mph H 45%29.71 inHg

Friday

12:00 AM

Overcast night

63° 💧 None 💨 7 mph H 50%29.71 inHg

1:00 AM

Mostly cloudy night

62° 💧 None 💨 6 mph H 55%29.71 inHg

2:00 AM

Mostly clear night

60° 💧 None 💨 5 mph H 60%29.74 inHg

3:00 AM

Mostly clear night

58° 💧 None 💨 6 mph H 68%29.74 inHg

4:00 AM

Partly cloudy night

56° 💧 0.001 in 💨 6 mph H 79%29.77 inHg

5:00 AM

Light rain

54° 💧 0.008 in 💨 4 mph H 89%29.77 inHg

6:00 AM

Light rain

54° 💧 0.061 in 💨 5 mph H 96%29.80 inHg

9:00 AM

Light rain

54° 💧 None 💨 8 mph H 97%29.83 inHg

12:00 PM

Light rain

60° 💧 None 💨 10 mph H 69%29.88 inHg

3:00 PM

Mostly cloudy

60° 💧 None 💨 14 mph H 48%29.91 inHg

6:00 PM

Mostly sunny

59° 💧 None 💨 13 mph H 44%29.94 inHg

9:00 PM

Mostly clear night

52° 💧 None 💨 7 mph H 58%30.03 inHg

Saturday

12:00 AM

Partly cloudy night

48° 💧 None 💨 3 mph H 70%30.06 inHg

3:00 AM

Mostly cloudy night

47° 💧 None 💨 0 mph H 72%30.09 inHg

6:00 AM

Partly cloudy night

44° 💧 None 💨 3 mph H 79%30.09 inHg

9:00 AM

Mostly cloudy

49° 💧 None 💨 6 mph H 76%30.15 inHg

12:00 PM

Overcast

56° 💧 None 💨 9 mph H 57%30.09 inHg

3:00 PM

Overcast

58° 💧 None 💨 11 mph H 49%30.03 inHg

6:00 PM

Overcast

58° 💧 None 💨 13 mph H 50%29.94 inHg

9:00 PM

Partly cloudy night

52° 💧 None 💨 14 mph H 66%29.91 inHg

Sunday

12:00 AM

Overcast night

49° 💧 None 💨 13 mph H 70%29.88 inHg

3:00 AM

Mostly cloudy night

44° 💧 None 💨 13 mph H 96%29.85 inHg

6:00 AM

Light rain

44° 💧 None 💨 10 mph H 99%29.83 inHg

9:00 AM

Moderate rain

46° 💧 None 💨 7 mph H 96%29.77 inHg

12:00 PM

Light rain

48° 💧 None 💨 10 mph H 94%29.77 inHg

3:00 PM

Moderate rain

48° 💧 None 💨 16 mph H 85%29.83 inHg

6:00 PM

Overcast

42° 💧 None 💨 22 mph H 78%30.00 inHg

9:00 PM

Light rain

38° 💧 None 💨 19 mph H 94%30.09 inHg

Monday

12:00 AM

Overcast night

40° 💧 None 💨 17 mph H 88%30.12 inHg

6:00 AM

Overcast night

43° 💧 None 💨 18 mph H 90%30.06 inHg

12:00 PM

Partly cloudy

40° 💧 None 💨 7 mph H 86%30.06 inHg

6:00 PM

Sunny

61° 💧 None 💨 13 mph H 40%29.97 inHg

Tuesday

12:00 AM

Clear night

65° 💧 None 💨 10 mph H 32%29.94 inHg

6:00 AM

Mostly clear night

51° 💧 None 💨 8 mph H 56%30.03 inHg

12:00 PM

Partly cloudy

45° 💧 None 💨 3 mph H 68%30.03 inHg

6:00 PM

Partly cloudy

66° 💧 None 💨 8 mph H 37%30.03 inHg

Wednesday

12:00 AM

Mostly clear night

67° 💧 None 💨 9 mph H 35%29.97 inHg

6:00 AM

Clear night

52° 💧 None 💨 2 mph H 65%30.09 inHg

12:00 PM

Sunny

48° 💧 None 💨 5 mph H 72%30.06 inHg

6:00 PM

Sunny

66° 💧 None 💨 5 mph H 48%30.12 inHg

Thursday

12:00 AM

Partly cloudy night

66° 💧 None 💨 11 mph H 51%30.18 inHg

6:00 AM

Light rain

49° 💧 None 💨 9 mph H 80%30.47 inHg

12:00 PM

Overcast

45° 💧 None 💨 7 mph H 92%30.56 inHg

6:00 PM

Overcast

51° 💧 None 💨 9 mph H 83%30.53 inHg

Friday

12:00 AM

Overcast night

62° 💧 None 💨 13 mph H 66%30.36 inHg

6:00 AM

Partly cloudy night

55° 💧 None 💨 10 mph H 89%30.27 inHg

12:00 PM

Partly cloudy

60° 💧 None 💨 13 mph H 79%30.09 inHg

6:00 PM

Partly cloudy

78° 💧 None 💨 19 mph H 48%29.91 inHg

Saturday

12:00 AM

Partly cloudy night

81° 💧 None 💨 9 mph H 49%29.77 inHg

6:00 AM

Clear night

62° 💧 None 💨 7 mph H 87%29.74 inHg

12:00 PM

Sunny

55° 💧 None 💨 18 mph H 68%29.88 inHg

6:00 PM

Sunny

65° 💧 None 💨 23 mph H 21%29.91 inHg

Sunday

12:00 AM

Clear night

63° 💧 None 💨 21 mph H 31%29.94 inHg

6:00 AM

Clear night

53° 💧 None 💨 15 mph H 50%30.09 inHg

12:00 PM

Sunny

51° 💧 None 💨 13 mph H 52%30.15 inHg

6:00 PM

Sunny

66° 💧 None 💨 11 mph H 33%30.18 inHg

Monday

12:00 AM

Clear night

65° 💧 None 💨 14 mph H 32%30.15 inHg

6:00 AM

Clear night

53° 💧 None 💨 8 mph H 55%30.30 inHg

12:00 PM

Sunny

49° 💧 None 💨 8 mph H 60%30.33 inHg

6:00 PM

Sunny

67° 💧 None 💨 4 mph H 26%30.30 inHg

Tuesday

12:00 AM

Clear night

71° 💧 None 💨 5 mph H 22%30.15 inHg

6:00 AM

Clear night

54° 💧 None 💨 5 mph H 45%30.15 inHg

12:00 PM

Sunny

58° 💧 None 💨 8 mph H 28%30.09 inHg

6:00 PM

Sunny

77° 💧 None 💨 5 mph H 18%30.03 inHg

Wednesday

12:00 AM

Clear night

78° 💧 None 💨 4 mph H 25%29.91 inHg

In Grass Range and, more broadly, across the state of Montana: Skies will feature a mix of sun and clouds throughout the afternoon, with temperatures remaining on the cooler side, ranging from 46 to 52 degrees Fahrenheit. There is a possibility of light rain, with about 0.03 inches expected, and the highest chance of rain occurring around 47%. Winds will be moderate from the northwest, averaging up to 13 mph, with gusts reaching 19 mph. Overall, expect a day with variable skies and mild conditions, so it’s a good idea to carry an umbrella if you plan to be outdoors later today.

15-Day Weather Outlook for Grass Range

TomorrowTomorrow

Mostly cloudy 73°/53° 💧 None 💨 14 mph

Thursday, Sep 10Thu Sep 10

Mostly sunny 82°/57° 💧 None 💨 16 mph

Friday, Sep 11Fri Sep 11

Light rain 80°/54° 💧 0.164 in 💨 14 mph

Saturday, Sep 12Sat Sep 12

Mostly cloudy 59°/44° 💧 None 💨 13 mph

Sunday, Sep 13Sun Sep 13

Moderate rain 58°/44° 💧 0.541 in 💨 16 mph

Monday, Sep 14Mon Sep 14

Light rain 43°/38° 💧 0.097 in 💨 22 mph

Tuesday, Sep 15Tue Sep 15

Mostly sunny 65°/45° 💧 None 💨 13 mph

Wednesday, Sep 16Wed Sep 16

Partly cloudy 67°/48° 💧 None 💨 9 mph

Thursday, Sep 17Thu Sep 17

Light rain 66°/45° 💧 0.029 in 💨 11 mph

Friday, Sep 18Fri Sep 18

Overcast 62°/51° 💧 0.030 in 💨 13 mph

Saturday, Sep 19Sat Sep 19

Partly cloudy 81°/55° 💧 0.076 in 💨 19 mph

Sunday, Sep 20Sun Sep 20

Sunny 65°/51° 💧 None 💨 23 mph

Monday, Sep 21Mon Sep 21

Sunny 66°/49° 💧 None 💨 14 mph

Tuesday, Sep 22Tue Sep 22

Sunny 71°/54° 💧 0.001 in 💨 8 mph

Wednesday, Sep 23Wed Sep 23

Sunny 78°/77° 💧 None 💨 5 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in Grass Range

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for Grass Range

Hourly forecast · Updated every 2 hours

Fair

Nearest forecast value 1:00 PM

PM2.5 Fine particles Good 0,5µg/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 0,6µg/m³

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

O₃ Ozone Fair 87,0µg/m³

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

NO₂ Nitrogen dioxide Good 0,3µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is acceptable for most people.

UV & HEALTH

UV, Sun & Health Outlook in Grass Range

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 5,8Moderate 🙂Fair

Tomorrow UV 5,5Moderate 🙂Fair

Thursday UV 5,9Moderate 😐Moderate

Friday UV 3,7Moderate 🙂Fair

Saturday UV 3,0Moderate 😊Good

Sunday UV 2,0Low —Unavailable

Monday UV 5,0Moderate —Unavailable

Hourly UV index today

1:00 PMUV 5,8 2:00 PMUV 5,5 3:00 PMUV 3,7 4:00 PMUV 2,4 5:00 PMUV 1,5 6:00 PMUV 0,6 7:00 PMUV 0,1

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

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

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 Grass Range

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · GRASS RANGE, MONTANA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 4:00 AM–5:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 4:00 AM–5:00 AM Astronomical darkness: 9:28 PM–4:58 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 7% Waning Crescent · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 75° high at the best hour.

✦ Estimated visible meteors 2–5/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min80%

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

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

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

UPCOMING

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

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 Grass Range were last refreshed today at 12:20 PM. The current forecast period extends through 10/09/2026 at 10:00 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.