Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 77°F. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Tuesday
7th Jul
77

55

10

8
Wednesday
8th Jul
84

55

11

8
Thursday
9th Jul
82

55

15

9
Friday
10th Jul
90

57

14

9
Saturday
11th Jul
95

63

14

9

5-day weather forecast updated at 04:03 on Tuesday 7th 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 Tuesday 7th July 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 77°F, maximum UV of 8 (Very High) and 10 hours of bright sunshine. There are 2-5 mm of rainfall expected with 86% chance of some rain and a gentle breeze of 8 mph from the east.

77
°F maximum temperature
55
°F minimum temperature
isolated thunderstorms
10
hours of sunshine
8
UV index (Very High)
86
% chance of some rain
<5
mm of rainfall expected
77
°F wind chill
8
mph wind from E

Lewistown weather for Wednesday 8th 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 11 hours of bright sunshine. There are 0-2 mm of rainfall expected with 44% chance of some rain and a light breeze of 6 mph from the south-east.

84
°F maximum temperature
55
°F minimum temperature
isolated thunderstorms
11
hours of sunshine
8
UV index (Very High)
44
% chance of some rain
<2
mm of rainfall expected
L
low heat & humidity
6
mph wind from SE

Lewistown weather for Thursday 9th July 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 82°F, low levels of heat & humidity, maximum UV of 9 (Very High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the north-west.

82
°F maximum temperature
55
°F minimum temperature
clear skies
15
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
6
mph wind from NW

Lewistown weather for Friday 10th July 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 90°F, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 14 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 6 mph from the south.

90
°F maximum temperature
57
°F minimum temperature
scattered clouds
14
hours of sunshine
9
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
6
mph wind from S

Lewistown weather for Saturday 11th July 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 95°F, high levels of heat & humidity, maximum UV of 9 (Very 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.