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September weather forecast in Mason City

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

30 days Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Sun

Sunday

Mon

Monday

Tue

Tuesday

Wed

Wednesday

Thu

Thursday

Fri

Friday

Sat

Saturday

31 August, sun

	731 mmHg		73%
	5.1 m/s

31 August, Sunday. day, 26°; night, 16°; clear

1 September, mon

	731 mmHg		74%
	5.5 m/s

1 September, Monday. day, 25°; night, 15°; clear

2 September, tue

	731 mmHg		74%
	5.4 m/s

2 September, Tuesday. day, 26°; night, 16°; rain

3 September, wed

	731 mmHg		74%
	5.8 m/s

3 September, Wednesday. day, 25°; night, 16°; clear

4 September, thu

	731 mmHg		72%
	5.3 m/s

4 September, Thursday. day, 26°; night, 15°; clear

5 September, fri

	732 mmHg		73%
	5.9 m/s

5 September, Friday. day, 26°; night, 15°; clear

6 September, sat

	731 mmHg		72%
	5.7 m/s

6 September, Saturday. day, 26°; night, 16°; clear

7 September, sun

	731 mmHg		73%
	5.6 m/s

7 September, Sunday. day, 24°; night, 15°; rain

8 September, mon

	731 mmHg		73%
	5.4 m/s

8 September, Monday. day, 23°; night, 13°; clear

9 September, tue

	731 mmHg		74%
	5.7 m/s

9 September, Tuesday. day, 23°; night, 13°; clear

10 September, wed

	732 mmHg		71%
	6.3 m/s

10 September, Wednesday. day, 24°; night, 14°; rain

11 September, thu

	732 mmHg		70%
	6.2 m/s

11 September, Thursday. day, 24°; night, 14°; clear

12 September, fri

	731 mmHg		71%
	5.7 m/s

12 September, Friday. day, 23°; night, 14°; partly cloudy

13 September, sat

	731 mmHg		71%
	5.4 m/s

13 September, Saturday. day, 23°; night, 13°; clear

14 September, sun

	731 mmHg		71%
	5.8 m/s

14 September, Sunday. day, 23°; night, 12°; partly cloudy

15 September, mon

	732 mmHg		69%
	5.9 m/s

15 September, Monday. day, 23°; night, 13°; partly cloudy

16 September, tue

	732 mmHg		70%
	5.8 m/s

16 September, Tuesday. day, 24°; night, 13°; clear

17 September, wed

	731 mmHg		71%
	5.9 m/s

17 September, Wednesday. day, 23°; night, 14°; clear

18 September, thu

	730 mmHg		71%
	6.2 m/s

18 September, Thursday. day, 23°; night, 13°; overcast

19 September, fri

	729 mmHg		74%
	6.6 m/s

19 September, Friday. day, 23°; night, 15°; rain

20 September, sat

	729 mmHg		70%
	7 m/s

20 September, Saturday. day, 23°; night, 13°; rain

21 September, sun

	730 mmHg		70%
	7 m/s

21 September, Sunday. day, 22°; night, 13°; rain

22 September, mon

	731 mmHg		73%
	6.1 m/s

22 September, Monday. day, 21°; night, 11°; rain

23 September, tue

	731 mmHg		72%
	6.1 m/s

23 September, Tuesday. day, 21°; night, 11°; partly cloudy

24 September, wed

	731 mmHg		71%
	6.3 m/s

24 September, Wednesday. day, 21°; night, 11°; overcast

25 September, thu

	730 mmHg		71%
	5.6 m/s

25 September, Thursday. day, 22°; night, 11°; rain

26 September, fri

	730 mmHg		70%
	6 m/s

26 September, Friday. day, 22°; night, 11°; clear

27 September, sat

	729 mmHg		68%
	6 m/s

27 September, Saturday. day, 21°; night, 11°; clear

28 September, sun

	731 mmHg		69%
	6.1 m/s

28 September, Sunday. day, 20°; night, 10°; clear

29 September, mon

	732 mmHg		67%
	6.6 m/s

29 September, Monday. day, 21°; night, 10°; clear

30 September, tue

	730 mmHg		64%
	7 m/s

30 September, Tuesday. day, 22°; night, 11°; clear

1 October, wed

	731 mmHg		67%
	6.6 m/s

1 October, Wednesday. day, 20°; night, 11°; rain

2 October, thu

	731 mmHg		70%
	6.1 m/s

2 October, Thursday. day, 19°; night, 9°; rain

3 October, fri

	730 mmHg		69%
	6.5 m/s

3 October, Friday. day, 19°; night, 10°; clear

4 October, sat

	732 mmHg		67%
	6.6 m/s

4 October, Saturday. day, 19°; night, 9°; clear

Average data for 10 years

Mason City September

16

sunny days

8

days with precipitation

4

cloudy days

16 sunny days; 8 days with precipitation; 4 cloudy days;

71

%

air humidity

4.1

m/s

WindS

83

mm of precipitation

(9% of annual average)

air humidity 71%; 83 millimeters of precipitation (9% of annual average); Wind southerly 4.1 Meters per second

Weather graphs for September

TemperaturePrecipitation chance, %Humidity, %Wind, m/sPressure, mmHg

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S

S

S

S

SW

S

S

S

S

S

SW

S

SW

S

S

S

S

S

SW

SW

SW

S

S

SW

S

S

S

S

S

1

Average data for 10 years

2

3

4

5

6

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8

9

10

11

12

13

14

15

16

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Daytime temperature

Night-time temperature

Cities near you

Minneapolis
New Ulm
Rochester
Minnetonka
Wisconsin Dells
Mora
Iowa City
Eagan
Omaha

Cities with similar weather in September

Budapest
Toronto
Hévíz
Boston
Lyon
Rogaška Slatina
Sapporo
Rijeka
Colorado Springs

The weather forecast for September 2025 is based on historical data from the past 10 years.

September in Mason City is the sunniest month of the year. In September, the weather in Mason City is typically warm. Average daily high temperature in September is about 23 degrees above zero. On average, Mason City has 16 sunny, 8 rainy, 4 partly cloudy, and 2 cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most comfortable time to visit Mason City.

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