Annual mean 11°C · wettest around April · prevailing wind SW
Warmest
27.9 °C
Coldest
-4.0 °C
Wettest
51%
Windiest
6.7 m/s
Prevailing
SW
5.2 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Ottumwa over the whole year is 11°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -6°C. Ottumwa has no sharply defined rainy season: the chance of rain on a given day runs from 43% in February, the driest month, to 48% in April, the wettest. Winds in Ottumwa are highest in April, averaging 5.3 m/s (19 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the SW. The clearest skies in Ottumwa come in June, when the sky is typically 23% covered; January is the cloudiest month, at 53%.
Month by month Ottumwa climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
-3°C
-6°C
-9°C
45%
53%
4.7 m/s
0
0
2
February
1°C
-5°C
-5°C
43%
42%
4.8 m/s
2
0
11
March
8°C
1°C
2°C
47%
48%
5.1 m/s
5
0
25
April
14°C
6°C
8°C
48%
41%
5.3 m/s
23
1
50
May
21°C
13°C
18°C
48%
40%
4.2 m/s
59
15
64
June
27°C
19°C
26°C
47%
23%
3.7 m/s
54
53
26
July
28°C
20°C
29°C
48%
25%
2.9 m/s
38
64
11
August
27°C
18°C
27°C
47%
27%
2.8 m/s
52
56
22
September
25°C
15°C
23°C
46%
28%
3.2 m/s
61
42
42
October
16°C
8°C
12°C
46%
38%
4.0 m/s
37
5
59
November
8°C
2°C
3°C
45%
38%
4.4 m/s
8
0
30
December
2°C
-3°C
-4°C
46%
46%
4.5 m/s
0
0
9
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Ottumwa weather by season
Year round, Ottumwa has days of about -3°C at their warmest in January, its coolest month, and 28°C in July, its warmest; the coolest hours of the day run from -6°C to 20°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around April and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Ottumwa weather in winterDecember to February
High -0°CLow -5°CRain 45%
Winter in Ottumwa has typical daily highs of about -0°C and lows of about -5°C, with a 45% chance of rain on a given day.
Ottumwa weather in springMarch to May
High 14°CLow 7°CRain 48%
Spring in Ottumwa has typical daily highs of about 14°C and lows of about 7°C, with a 48% chance of rain on a given day.
Ottumwa weather in summerJune to August
High 27°CLow 19°CRain 47%
Summer in Ottumwa has typical daily highs of about 27°C and lows of about 19°C, with a 47% chance of rain on a given day.
Ottumwa weather in autumnSeptember to November
High 16°CLow 8°CRain 46%
Autumn in Ottumwa has typical daily highs of about 16°C and lows of about 8°C, with a 46% chance of rain on a given day.
When is the rainy season in Ottumwa?
Ottumwa has no sharply defined rainy season: the chance of rain on a given day runs from 43% in February, the driest month, to 48% in April, the wettest.
What time of year is Ottumwa windiest?
Winds in Ottumwa are highest in April, averaging 5.3 m/s (19 km/h), and lightest in August, at 2.8 m/s (10 km/h). The prevailing wind is from the SW.
What is the average temperature in Ottumwa year round?
The average temperature in Ottumwa over the whole year is 11°C. July is the hottest month, with highs of about 28°C; January is the coldest, with lows of about -6°C.