Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 25°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Sunday
16th Aug
25

13

9

6
Monday
17th Aug
24

12

8

6
Tuesday
18th Aug
24

13

8

6
Wednesday
19th Aug
26

12

13

6
Thursday
20th Aug
28

13

13

7

5-day weather forecast updated at 04:03 on Sunday 16th 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 Sunday 16th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 25°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0-2 mm of rainfall expected with 21% chance of some rain and a light breeze of 9 kph from the north-west.

25
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
9
hours of sunshine
6
UV index (High)
21
% chance of some rain
<2
mm of rainfall expected
25
°C wind chill
9
kph wind from NW

Lewistown weather for Monday 17th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 24°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 23% chance of some rain and a light breeze of 7 kph from the west.

24
°C maximum temperature
12
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
6
UV index (High)
23
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
7
kph wind from W

Lewistown weather for Tuesday 18th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 24°C, maximum UV of 6 (High) and 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 41% chance of some rain and a light breeze of 7 kph from the south.

24
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
6
UV index (High)
41
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
7
kph wind from S

Lewistown weather for Wednesday 19th August 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 6 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south.

26
°C maximum temperature
12
°C minimum temperature
clear skies
13
hours of sunshine
6
UV index (High)
0
mm of rainfall expected
26
°C wind chill
11
kph wind from S

Lewistown weather for Thursday 20th August 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the north-west.