Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 30°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Thursday
27th Aug
30

13

8

6
Friday
28th Aug
26

15

3

5
Saturday
29th Aug
23

12

3

6
Sunday
30th Aug
16

7

2

5
Monday
31st Aug
22

4

12

6

5-day weather forecast updated at 04:03 on Friday 28th August 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 Thursday 27th August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-east.

30
°C maximum temperature
13
°C minimum temperature
scattered clouds
8
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
11
kph wind from SE

Lewistown weather for Friday 28th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 5 (Moderate) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 23% chance of some rain and a gentle breeze of 13 kph from the south.

26
°C maximum temperature
15
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
5
UV index (Moderate)
23
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
13
kph wind from S

Lewistown weather for Saturday 29th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 23°C, maximum UV of 6 (High) and 3 hours of bright sunshine. There are 0-2 mm of rainfall expected with 53% chance of some rain and a light breeze of 8 kph from the south.

23
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
6
UV index (High)
53
% chance of some rain
<2
mm of rainfall expected
23
°C wind chill
8
kph wind from S

Lewistown weather for Sunday 30th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 16°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 68% chance of some rain and a moderate breeze of 21 kph from the west.

16
°C maximum temperature
7
°C minimum temperature
isolated thunderstorms
2
hours of sunshine
5
UV index (Moderate)
68
% chance of some rain
<10
mm of rainfall expected
0
no heat & humidity
21
kph wind from W

Lewistown weather for Monday 31st August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 22°C, maximum UV of 6 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the west.