Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 86°F. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Monday
25th May
86

41

14

UV7
Tuesday
26th May
88

55

8

UV6
Wednesday
27th May
82

57

4

UV6
Thursday
28th May
86

57

8

UV8
Friday
29th May
88

55

13

UV8

5-day weather forecast updated at 04:03 on Tuesday 26th 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 Monday 25th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 7 (High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.

86
°F maximum temperature
41
°F minimum temperature
scattered clouds
14
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
7
mph wind from SE

Lewistown weather for Tuesday 26th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 24% chance of some rain and a moderate breeze of 14 mph from the south-east.

88
°F maximum temperature
55
°F minimum temperature
isolated thunderstorms
8
hours of sunshine
UV6
UV index (High)
24
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
14
mph wind from SE

Lewistown weather for Wednesday 27th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 6 (High) and 4 hours of bright sunshine. There are 0-2 mm of rainfall expected with 40% chance of some rain and a light breeze of 6 mph from the south-east.

82
°F maximum temperature
57
°F minimum temperature
isolated thunderstorms
4
hours of sunshine
UV6
UV index (High)
40
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
6
mph wind from SE

Lewistown weather for Thursday 28th May 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 86°F, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 14% chance of some rain and a light breeze of 7 mph from the east.

86
°F maximum temperature
57
°F minimum temperature
isolated thunderstorms
8
hours of sunshine
UV8
UV index (Very High)
14
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
7
mph wind from E

Lewistown weather for Friday 29th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 mph from the south-east.