Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 8°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Wednesday
17th Dec
8

-6

3

1
Thursday
18th Dec
4

-7

6

1
Friday
19th Dec
8

-4

3

0
Saturday
20th Dec
0

-6

6

1
Sunday
21st Dec
4

-4

5

1

5-day weather forecast updated at 04:03 on Wednesday 17th December 2025 GMT

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The 5-day weather forecast for Montana (Lewistown) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Lewistown weather forecast by day

Below are the detailed weather forecasts for Lewistown for the next 5 days.

Lewistown weather for Wednesday 17th December 2025

Expect mostly cloudy with rain in Lewistown, Montana with a maximum temperature of 8°C, maximum UV of 1 (Low) and 3 hours of bright sunshine. There are 5-10 mm of rainfall expected with 57% chance of some rain and a moderate gale of 57 kph from the west.

8
°C maximum temperature
-6
°C minimum temperature
mostly cloudy with rain
3
hours of sunshine
1
UV index (Low)
57
% chance of some rain
<10
mm of rainfall expected
3
°C wind chill
57
kph wind from W

Lewistown weather for Thursday 18th December 2025

Expect cloudy with sleet or snow in Lewistown, Montana with a maximum temperature of 4°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0-2 mm of sleet/snow expected with 13% chance of some sleet or snow and a fresh breeze of 32 kph from the south-west.

4
°C maximum temperature
-7
°C minimum temperature
cloudy with sleet or snow
6
hours of sunshine
1
UV index (Low)
13
% chance of some sleet or snow
<2
mm of sleet/snow expected
-2
°C wind chill
32
kph wind from SW

Lewistown weather for Friday 19th December 2025

Expect cloudy with sleet or snow in Lewistown, Montana with a maximum temperature of 8°C and 3 hours of bright sunshine. There are 2-5 mm of sleet/snow expected with 39% chance of some sleet or snow and a fresh breeze of 37 kph from the west.

8
°C maximum temperature
-4
°C minimum temperature
cloudy with sleet or snow
3
hours of sunshine
0
UV index (None)
39
% chance of some sleet or snow
<5
mm of sleet/snow expected
3
°C wind chill
37
kph wind from W

Lewistown weather for Saturday 20th December 2025

Expect broken clouds in Lewistown, Montana with a maximum temperature of 0°C, maximum UV of 1 (Low) and 6 hours of bright sunshine. There are 0 cm of snow expected and a moderate breeze of 26 kph from the west.

0
°C maximum temperature
-6
°C minimum temperature
broken clouds
6
hours of sunshine
1
UV index (Low)
0
cm of snow expected
-6
°C wind chill
26
kph wind from W

Lewistown weather for Sunday 21st December 2025

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 4°C, maximum UV of 1 (Low) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south.