When vacationing in the mountains, the weather can be unpredictable. Coming prepared can make all the difference in the world, especially during colder times of the year. Although extremely rare, it can snow in Glacier National Park every month of the year therefore bringing appropriate clothing (just in case) can be the difference between a thoroughly enjoyable vacation and chilled.

July and August daytime temperatures normally range between 70°F and 80°F (22°C to 27°C) although it is possible to have temperatures above 90°F (32°C). Nighttime temperatures during July and August normally range between 45°F and 55°F (7°C to 13°C) but it’s possible to see temperatures as low as 20°F (-6°C). Although rain is always possible in these months, July and August are typically our two driest months of the year coupled with low humidity levels.

May and June temperatures tend to be cooler with daytime highs normally ranging between 60°F and 75°F (16° to 24°C) although you can also see highs above 90°F (32°C) on occasion. May and June also tend to have more moisture with June being one of our wettest months of the year. Rain gear is definitely a must if you are vacationing in Glacier Park during May and June.

Once we get into September and October, the temperatures cool down again with highs normally between 60°F and 70°F (16°C to 22°C) and not unusual to have some days in September with a high in the upper 80°F (27°C). The lows also are cooler and tend to range between 30°F and 45°F (-1°C to 7°C). September can also bring on a bit more moisture than July and August.

If you’re planning a winter vacation to Glacier National Park, come prepared for snow, and lots of it. High temperatures generally range between 20°F and 30°F (-6°C to -1°C) but can, on occasion, get above 40°F (5°C). Winter low temperatures normally range between 10°F and 20°F (-2°C to -6°C). We do get some very cold days during the winter, dipping down as low as -40°F (-40°C). So, always plan to dress in layers. Even in the summer, the mornings are cool so you’ll want to have a long sleeve fleece or something similar over your summer attire, and if you’re hiking higher in the mountains, wind can be a factor so a light wind breaker or rain jacket can be extremely helpful.

Current Temperatures

Historical Temperatures (7 Years)

Source: timeanddate.com

Recorded high/low temperatures occurred between 12:00 Noon and 6:00 PM

Year (2019)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201919.4/17.6-7/-875%
April 15, 201946.4/37.48/370%
July 15, 201980.6/75.227/2428%
October 15, 201953.6/46.412/848%
Year (2018)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201837.4/26.63/-380%
April 15, 201855.4/48.213/952%
July 15, 201886/78.830/2630%
October 15, 201851.8/44.611/744%
Year (2017)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201717.6/14-8/-1084%
April 15, 201750/46.410/835%
July 15, 201789.6/78.832/2634%
October 15, 201755.4/46.413/848%
Year (2016)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201630.2/30.2-1/-190%
April 15, 201653.6/48.212/944%
July 15, 201684.2/75.229/2426%
October 15, 201655.4/51.813/1164%
Year (2015)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201526.6/24.8-3/-490%
April 15, 201553.6/48.212/941%
July 15, 201578.8/73.426/2335%
October 15, 201566.2/60.819/1624%
Year (2014)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201441/39.25/464%
April 15, 201450/44.610/751%
July 15, 201480.6/73.427/2344%
October 15, 201459/5015/1063%
Year (2013)Fahrenheit (high/low)Celsius (high/low)Humidity
Jan 15, 201326.6/23-3/-579%
April 15, 201339.2/37.44/330%
July 15, 201387.8/80.631/2716%
October 15, 201351.8/46.411/891%

Rainfall (2019)

Source: NOAA National Centers for Environmental Information

January ⟶ 9.2 inches ⟶ 23.37 centimeters
February ⟶ 7 inches ⟶ 17.78 centimeters
March ⟶ 7.4 inches ⟶ 18.8 centimeters
April ⟶ 5.6 inches ⟶ 14.22 centimeters
May ⟶ 5.1 inches ⟶ 12.95 centimeters
June ⟶ 5.6 inches ⟶ 14.22 centimeters
July ⟶ 2.4 inches ⟶ 6.1 centimeters
August ⟶ 2 inches ⟶ 5.08 centimeters
September ⟶ 3.4 inches ⟶ 8.64 centimeters
October ⟶ 5.3 inches ⟶ 13.46 centimeters
November ⟶ 8.8 inches ⟶ 22.35 centimeters
December ⟶ 8.8 inches ⟶ 22.35 centimeters

Snow Fall (2019)

Source: NOAA National Centers for Environmental Information

January ⟶ 18.4 inches ⟶ 46.74 centimeters
February ⟶ 19.9 inches ⟶ 50.55 centimeters
March ⟶ 17.7 inches ⟶ 44.96 centimeters
April ⟶ 14.4 inches ⟶ 36.58 centimeters
May ⟶ 4.3 inches ⟶ 10.92 centimeters
June ⟶ 0.8 inches ⟶ 2.03 centimeters
July ⟶ 0 inches ⟶ 0 centimeters
August ⟶ 0.2 inches ⟶ 0.51 centimeters
September ⟶ 1.4 inches ⟶ 3.56 centimeters
October ⟶ 6.9 inches ⟶ 17.53 centimeters
November ⟶ 16.9 inches ⟶ 42.93 centimeters
December ⟶ 17.4 inches ⟶ 44.2 centimeters

Farmer’s Almanac 2019/2020

Winter temperatures will be above normal, on average, in the north and below average in central and southern portions of the region, with the coldest periods in mid- to late December and early January and from late January through the first half of February. Precipitation and snowfall will be above normal, with the snowiest periods in mid- to late December, early and late January, early February, and early and late March. April and May will be cooler than normal, with near-normal precipitation. Summer will be slightly cooler and rainier than normal, with the hottest period from late June through early July. September and October will be warmer than normal, with below-normal precipitation.

Glacier National Park Webcams

The Montana Department of Transportation also maintains numerous cameras covering roads and highways.

Current Weather & Forecasts (By Phone)

Billings
406-652-1916

Glasgow
406-228-9625

Kalispell
406-755.4829

Missoula
406-721-3939

North-central MT (Great Falls, Helena, Havre, Lewistown, Browning & Glacier National Park)
406-453-5469 or 406-453-5460

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