Annual mean 12°C · wettest around January · prevailing wind W
Warmest
31.3 °C
Coldest
2.3 °C
Wettest
21%
Windiest
4.4 m/s
Prevailing
W
3.4 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Hermiston over the whole year is 12°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about -0°C. Hermiston has no sharply defined rainy season: the chance of rain on a given day runs from 9% in July, the driest month, to 19% in January, the wettest. Winds in Hermiston are highest in April, averaging 3.6 m/s (13 km/h), and lightest in January, at 2.4 m/s (9 km/h). The prevailing wind is from the W. The clearest skies in Hermiston come in July, when the sky is typically 5% covered; December is the cloudiest month, at 60%.
Month by month Hermiston 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
-0°C
-1°C
19%
56%
2.4 m/s
0
0
11
February
6°C
-0°C
1°C
17%
46%
3.1 m/s
0
0
22
March
11°C
2°C
6°C
16%
38%
3.1 m/s
6
0
52
April
16°C
6°C
11°C
16%
30%
3.6 m/s
29
1
74
May
21°C
11°C
17°C
15%
25%
3.4 m/s
63
14
72
June
26°C
16°C
22°C
13%
18%
3.6 m/s
69
34
54
July
32°C
18°C
27°C
9%
5%
3.1 m/s
53
65
23
August
30°C
16°C
27°C
12%
8%
2.9 m/s
57
61
27
September
23°C
11°C
20°C
13%
19%
2.7 m/s
76
25
65
October
16°C
6°C
13°C
16%
26%
2.6 m/s
39
2
78
November
8°C
3°C
4°C
17%
45%
2.6 m/s
4
0
36
December
3°C
0°C
-1°C
19%
60%
2.4 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 Hermiston weather by season
Year round, Hermiston has days of about 3°C at their warmest in December, its coolest month, and 32°C in July, its warmest; the coolest hours of the day run from -0°C to 18°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around January and least likely around July. 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.
Hermiston weather in winterDecember to February
High 4°CLow -0°CRain 18%
Winter in Hermiston has typical daily highs of about 4°C and lows of about -0°C, with a 18% chance of rain on a given day.
Hermiston weather in springMarch to May
High 16°CLow 6°CRain 16%
Spring in Hermiston has typical daily highs of about 16°C and lows of about 6°C, with a 16% chance of rain on a given day.
Hermiston weather in summerJune to August
High 29°CLow 17°CRain 11%
Summer in Hermiston has typical daily highs of about 29°C and lows of about 17°C, with a 11% chance of rain on a given day.
Hermiston weather in autumnSeptember to November
High 16°CLow 7°CRain 15%
Autumn in Hermiston has typical daily highs of about 16°C and lows of about 7°C, with a 15% chance of rain on a given day.
When is the rainy season in Hermiston?
Hermiston has no sharply defined rainy season: the chance of rain on a given day runs from 9% in July, the driest month, to 19% in January, the wettest.
What time of year is Hermiston windiest?
Winds in Hermiston are highest in April, averaging 3.6 m/s (13 km/h), and lightest in January, at 2.4 m/s (9 km/h). The prevailing wind is from the W.
What is the average temperature in Hermiston year round?
The average temperature in Hermiston over the whole year is 12°C. July is the hottest month, with highs of about 32°C; January is the coldest, with lows of about -0°C.