Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 28°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Sunday
9th Aug
28

13

14

7
Monday
10th Aug
30

11

10

7
Tuesday
11th Aug
28

11

14

7
Wednesday
12th Aug
26

12

10

4
Thursday
13th Aug
20

11

2

5

5-day weather forecast updated at 04:03 on Sunday 9th 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 9th 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 14 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the north-west.

28
°C maximum temperature
13
°C minimum temperature
clear skies
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
19
kph wind from NW

Lewistown weather for Monday 10th August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.

30
°C maximum temperature
11
°C minimum temperature
scattered clouds
10
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from SE

Lewistown weather for Tuesday 11th August 2026

28
°C maximum temperature
11
°C minimum temperature
clear skies
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
14
kph wind from NW

Lewistown weather for Wednesday 12th August 2026

Expect sunshine and showers in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0-2 mm of rainfall expected with 33% chance of some rain and a gentle breeze of 18 kph from the east.

26
°C maximum temperature
12
°C minimum temperature
sunshine and showers
10
hours of sunshine
4
UV index (Moderate)
33
% chance of some rain
<2
mm of rainfall expected
26
°C wind chill
18
kph wind from E

Lewistown weather for Thursday 13th August 2026

Expect isolated thunderstorms in Lewistown, Montana with a maximum temperature of 20°C, maximum UV of 5 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 60% chance of some rain and a gentle breeze of 14 kph from the south-east.