Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 31°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Thursday
30th Jul
31

17

13

6
Friday
31st Jul
33

16

13

8
Saturday
1st Aug
37

16

10

8
Sunday
2nd Aug
29

14

13

8
Monday
3rd Aug
20

9

15

7

5-day weather forecast updated at 04:03 on Thursday 30th 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 Thursday 30th July 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 31°C, moderate levels of heat & humidity, 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-east.

31
°C maximum temperature
17
°C minimum temperature
scattered clouds
13
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 31st July 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 33°C, moderate levels of heat & humidity, maximum UV of 8 (Very 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.

33
°C maximum temperature
16
°C minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
10
kph wind from NW

Lewistown weather for Saturday 1st August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 37°C, high levels of heat & humidity, maximum UV of 8 (Very High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 19 kph from the south-west.

37
°C maximum temperature
16
°C minimum temperature
scattered clouds
10
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
H
high heat & humidity
19
kph wind from SW

Lewistown weather for Sunday 2nd August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 29°C, low levels of heat & humidity, maximum UV of 8 (Very High) and 13 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 24 kph from the north-west.

29
°C maximum temperature
14
°C minimum temperature
scattered clouds
13
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
L
low heat & humidity
24
kph wind from NW

Lewistown weather for Monday 3rd August 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 20°C, maximum UV of 7 (High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 16 kph from the north-west.