Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 88°F. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Sunday
19th Jul
88

61

12

8
Monday
20th Jul
81

55

13

10
Tuesday
21st Jul
82

57

6

8
Wednesday
22nd Jul
84

59

3

8
Thursday
23rd Jul
88

63

9

6

5-day weather forecast updated at 04:03 on Sunday 19th July 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 Sunday 19th July 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 88°F, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 12 hours of bright sunshine. There are 0-2 mm of rainfall expected with 10% chance of some rain and a gentle breeze of 9 mph from the north-west.

88
°F maximum temperature
61
°F minimum temperature
isolated thunderstorms
12
hours of sunshine
8
UV index (Very High)
10
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
9
mph wind from NW

Lewistown weather for Monday 20th July 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 81°F, low levels of heat & humidity, maximum UV of 10 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 10 mph from the north-west.

81
°F maximum temperature
55
°F minimum temperature
scattered clouds
13
hours of sunshine
10
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
10
mph wind from NW

Lewistown weather for Tuesday 21st July 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 12 mph from the east.

82
°F maximum temperature
57
°F minimum temperature
broken clouds
6
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
12
mph wind from E

Lewistown weather for Wednesday 22nd July 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 84°F, low levels of heat & humidity, maximum UV of 8 (Very High) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 36% chance of some rain and a gentle breeze of 8 mph from the east.

84
°F maximum temperature
59
°F minimum temperature
isolated thunderstorms
3
hours of sunshine
8
UV index (Very High)
36
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
8
mph wind from E

Lewistown weather for Thursday 23rd July 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 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a light breeze of 6 mph from the south.