Mason City · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Mason City & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
99°
Tue, Sep 1
Coldest night
43°
Fri, Sep 11
Days with precip
9 / 14
of 14 forecast days
Nicest day
Mon, Sep 7
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 29 – Sun 30 Aug
97° 62°
77% precip chance
Sat 5 – Sun 6 Sep
95° 67°
78% precip chance
Sat 12 – Sun 13 Sep
81° 57°
typical range
Sat 19 – Sun 20 Sep
80° 55°
typical range
30 days — Mason City
14 forecast + 16 climatology
Sat · Today Mostly cloudy
89°62°10.6 mm⌄
Wind20 mph S
Gusts38 mph
UV index7 – High
Precip chance77%
Sunrise06:33
Sunset19:53
Sun · Tomorrow Mostly cloudy
97°71°0.2 mm⌄
Wind14 mph S
Gusts27 mph
UV index8 – High
Precip chance18%
Sunrise06:35
Sunset19:51
Monday 31/8 Mostly cloudy
97°73°1.2 mm⌄
Wind11 mph NW
Gusts23 mph
UV index7 – High
Precip chance57%
Sunrise06:36
Sunset19:50
Tuesday 1/9 Mostly cloudy
99°70°0.3 mm⌄
Wind17 mph N
Gusts27 mph
UV index7 – High
Precip chance36%
Sunrise06:37
Sunset19:48
Wednesday 2/9 Sunny
83°64°17%⌄
Wind19 mph N
Gusts34 mph
UV index7 – High
Precip chance17%
Sunrise06:38
Sunset19:46
Thursday 3/9 Showers
97°68°4.2 mm⌄
Wind16 mph S
Gusts34 mph
UV index8 – Very high
Precip chance66%
Sunrise06:39
Sunset19:44
Friday 4/9 Mostly cloudy
95°74°1.4 mm⌄
Wind11 mph S
Gusts15 mph
UV index8 – Very high
Precip chance57%
Sunrise06:40
Sunset19:43
Saturday 5/9 Showers
95°72°7.3 mm⌄
Wind23 mph SE
Gusts34 mph
UV index7 – High
Precip chance78%
Sunrise06:41
Sunset19:41
Sunday 6/9 Partly cloudy
81°67°3.8 mm⌄
Wind15 mph N
Gusts24 mph
UV index7 – High
Precip chance65%
Sunrise06:42
Sunset19:39
Monday 7/9 Sunny
76°62°5%⌄
Wind12 mph NE
Gusts21 mph
UV index6 – High
Precip chance5%
Sunrise06:43
Sunset19:37
Tuesday 8/9 Mostly cloudy
68°58°3.6 mm⌄
Wind8 mph NE
Gusts21 mph
UV index4 – Moderate
Precip chance81%
Sunrise06:44
Sunset19:36
Wednesday 9/9 Showers
64°51°4.7 mm⌄
Wind12 mph NE
Gusts21 mph
UV index4 – Moderate
Precip chance81%
Sunrise06:45
Sunset19:34
Thursday 10/9 Partly cloudy
56°46°0.2 mm⌄
Wind15 mph NW
Gusts26 mph
UV index3 – Moderate
Precip chance38%
Sunrise06:47
Sunset19:32
Friday 11/9 Sunny
69°43°1.1 mm⌄
Wind13 mph NW
Gusts24 mph
UV index5 – Moderate
Precip chance57%
Sunrise06:48
Sunset19:30
Saturday 12/9 Rain (climatological)
77°57°10.1 mm⌄
Day≈72–83°
Night≈51–62°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 13/9 Partly cloudy (climatological)
81°59°20%⌄
Day≈76–86°
Night≈54–64°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 14/9 Partly cloudy (climatological)
81°59°20%⌄
Day≈76–87°
Night≈54–65°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 15/9 Rain (climatological)
76°56°10.6 mm⌄
Day≈71–82°
Night≈51–62°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 16/9 Partly cloudy (climatological)
73°55°20%⌄
Day≈68–79°
Night≈49–60°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 17/9 Partly cloudy (climatological)
70°52°20%⌄
Day≈64–75°
Night≈47–58°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Rain (climatological)
71°53°5.6 mm⌄
Day≈66–77°
Night≈48–59°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
74°55°20%⌄
Day≈68–79°
Night≈49–60°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
80°58°20%⌄
Day≈74–85°
Night≈53–64°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Rain (climatological)
79°58°8.4 mm⌄
Day≈73–84°
Night≈52–63°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
79°58°20%⌄
Day≈74–85°
Night≈53–63°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
76°56°20%⌄
Day≈70–81°
Night≈50–61°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Rain (climatological)
72°54°10.6 mm⌄
Day≈67–78°
Night≈48–59°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
74°55°20%⌄
Day≈68–79°
Night≈49–60°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
78°57°20%⌄
Day≈72–83°
Night≈51–62°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Rain (climatological)
78°57°9.2 mm⌄
Day≈73–84°
Night≈52–63°
Precip≈3.3 in / September
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Mason City, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.