Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 22°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Tuesday
4th Aug
22

5

11

7
Wednesday
5th Aug
26

6

13

7
Thursday
6th Aug
30

9

15

7
Friday
7th Aug
32

10

14

7
Saturday
8th Aug
30

12

12

7

5-day weather forecast updated at 04:03 on Tuesday 4th 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 Tuesday 4th August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 22°C, maximum UV of 7 (High) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 8 kph from the north.

22
°C maximum temperature
5
°C minimum temperature
scattered clouds
11
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
8
kph wind from N

Lewistown weather for Wednesday 5th August 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 7 (High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the north-west.

26
°C maximum temperature
6
°C minimum temperature
clear skies
13
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
11
kph wind from NW

Lewistown weather for Thursday 6th August 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 30°C, low levels of heat & humidity, maximum UV of 7 (High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the north-west.

30
°C maximum temperature
9
°C minimum temperature
clear skies
15
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
13
kph wind from NW

Lewistown weather for Friday 7th August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 32°C, moderate 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 13 kph from the north-west.

32
°C maximum temperature
10
°C minimum temperature
scattered clouds
14
hours of sunshine
7
UV index (High)
0
mm of rainfall expected
M
moderate heat & humidity
13
kph wind from NW

Lewistown weather for Saturday 8th August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 30°C, low levels of heat & humidity, maximum UV of 7 (High) and 12 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.