Lewistown weather live forecast

Today's maximum temperature in Lewistown is expected to be 18°C. Select a day from the live weather forecast for Lewistown, Montana, USA for more weather parameters.

Friday
22nd May
18

4

9

UV6
Saturday
23rd May
22

7

10

UV7
Sunday
24th May
26

10

15

UV6
Monday
25th May
29

11

10

UV7
Tuesday
26th May
28

12

9

UV6

5-day weather forecast updated at 04:02 on Friday 22nd May 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 Friday 22nd May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 18°C, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 7 kph from the north-west.

18
°C maximum temperature
4
°C minimum temperature
scattered clouds
9
hours of sunshine
UV6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
7
kph wind from NW

Lewistown weather for Saturday 23rd May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 22°C, maximum UV of 7 (High) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the south.

22
°C maximum temperature
7
°C minimum temperature
scattered clouds
10
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
9
kph wind from S

Lewistown weather for Sunday 24th May 2026

Expect clear skies in Lewistown, Montana with a maximum temperature of 26°C, maximum UV of 6 (High) and 15 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 20 kph from the west.

26
°C maximum temperature
10
°C minimum temperature
clear skies
15
hours of sunshine
UV6
UV index (High)
0
mm of rainfall expected
0
no heat & humidity
20
kph wind from W

Lewistown weather for Monday 25th May 2026

Expect broken clouds in Lewistown, Montana with a maximum temperature of 29°C, low 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 16 kph from the south.

29
°C maximum temperature
11
°C minimum temperature
broken clouds
10
hours of sunshine
UV7
UV index (High)
0
mm of rainfall expected
L
low heat & humidity
16
kph wind from S

Lewistown weather for Tuesday 26th May 2026

Expect scattered clouds in Lewistown, Montana with a maximum temperature of 28°C, low levels of heat & humidity, maximum UV of 6 (High) and 9 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 17 kph from the south-west.