Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 75°F. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Tuesday
12th May
75

50

14

7
Wednesday
13th May
86

50

9

6
Thursday
14th May
63

46

13

7
Friday
15th May
70

46

7

7
Saturday
16th May
61

41

5

6

5-day weather forecast updated at 04:02 on Tuesday 12th May 2026 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 Tuesday 12th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 75°F, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 9 mph from the south-east.

75
°F maximum temperature
50
°F minimum temperature
scattered clouds
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
75
°F wind chill
9
mph wind from SE

Lewistown weather for Wednesday 13th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 86°F, low levels of heat & humidity, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 37% chance of some rain and a fresh breeze of 20 mph from the west.

86
°F maximum temperature
50
°F minimum temperature
isolated thunderstorms
9
hours of sunshine
6
UV index (High)
37
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
20
mph wind from W

Lewistown weather for Thursday 14th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 63°F, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a strong breeze of 32 mph from the west.

63
°F maximum temperature
46
°F minimum temperature
scattered clouds
13
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
63
°F wind chill
32
mph wind from W

Lewistown weather for Friday 15th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 70°F, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a fresh breeze of 19 mph from the west.

70
°F maximum temperature
46
°F minimum temperature
broken clouds
7
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
70
°F wind chill
19
mph wind from W

Lewistown weather for Saturday 16th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 61°F, maximum UV of 6 (High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 17 mph from the north-west.