Hermiston weather in January

In January, Hermiston sees average daytime highs of 42°F and overnight lows near 31°F, with 1.5 in of precipitation across 9.5 wet days and about 8.9 hours of daylight. It is the 11th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 41°F in the first days to 45°F by the end. The sky is clear or mostly clear about 16% of the time in January, and the air most often feels dry.

Daylight stretches from about 8 h 30 min at the start of January to 9 h 24 min by month's end. Set against the rest of the year, January is Hermiston's 12th-clearest and 12th-windiest month. For the whole year in context, see Hermiston's year-round climate.

Daytime high
42°
11th warmest
Overnight low
31°
2nd coldest
Precipitation
1.5 in
9.5 wet days
Daylight
8 h 48 min
7:41 AM – 4:32 PM
Cloud cover
73%
12th clearest
Wind
6 mph
12th windiest
Solar energy
1.53 kWh/m²
Travel score
0.3
out of 10

Hermiston is city in Oregon, USA.

Density
815/km²
people per km²
Founded
1907

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in January

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 41°F in the first days to 45°F by the end.

A typical January day in Hermiston reaches about 42°F in the afternoon and slips back to 31°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 30°F and 54°F. Set against its neighbours, January runs on par with December and about 6°F cooler than February.

20°30°40°50°60°151015202531
Avg high (°F)Avg low (°F)
14030
24130
34130
44130
54130
64130
74130
84130
94130
104130
114130
124230
134230
144231
154231
164231
174231
184231
194231
204331
214331
224331
234331
244431
254431
264431
274431
284432
294532
304532
314532

How January really feels in Hermiston

Once humidity and wind are folded in, January averages 0 days that feel above 90°F and 31 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
31
wind chill below the day's low

The story in January is cold — wind chill drags the overnight "feels like" below the raw low.

Hermiston weather by month

How January compares with the rest of the year at a glance. January is the 11th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan42° / 31°1.59.52.28.90.3
Feb48° / 33°1.27.71.510.11.8
Mar56° / 38°1.38.30.311.64.0
Apr65° / 44°1.06.3013.36.2
May74° / 51°0.95.4014.77.6
Jun81° / 57°0.63.3015.57.4
Jul91° / 63°0.11015.24.9
Aug89° / 62°0.21013.95.3
Sep79° / 55°0.32.2012.38.1
Oct65° / 45°1.05.90.110.76.5
Nov50° / 36°1.48.70.79.32.3
Dec42° / 31°1.69.62.68.50.2

Cloud cover in January

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% of the time in January, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 14% of January, with mostly cloudy or overcast conditions the remaining 70%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12971
22971
32971
42971
52971
62872
72872
82872
92872
102773
112773
122872
132872
142872
152971
162971
172971
183070
193169
203169
213169
223169
233268
243367
253367
263367
273367
283367
293367
303367
313268

Chance of precipitation in January

Any precipitationSnow

Hermiston gets around 1.5 in of rain and snow over 9.5 wet days in January. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 31% and peaks near 32% on the wettest days, and about 2 days bring snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
13111
23111
33110
43110
53110
6319
7309
8309
9318
10318
11318
12327
13327
14327
15327
16327
17327
18326
19326
20326
21326
22326
23316
24316
25306
26306
27296
28296
29286
30286
31276

Humidity in January

DryComfortableHumidMuggyOppressiveMiserable

Most of January feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, January lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in January

Winds average 6 mph in January, the calmest month.

Across January, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm
316calm

Sunrise & sunset in January

DaylightNight

Daylight runs from about 8 h 30 min at the start of January to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 54 minutes over January. Sunrise moves from 7:44 AM to 7:29 AM, and sunset from 4:16 PM to 4:52 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
18.57:444:16
28.57:454:17
38.67:454:18
48.67:454:19
58.67:444:20
68.67:444:21
78.67:444:22
88.67:444:23
98.77:444:24
108.77:444:25
118.77:434:26
128.77:434:27
138.87:434:28
148.87:424:29
158.87:424:31
168.87:414:32
178.97:414:33
188.97:404:34
198.97:394:35
209.07:394:37
219.07:384:38
229.07:374:39
239.17:374:41
249.17:364:42
259.17:354:43
269.27:344:45
279.27:334:46
289.37:324:48
299.37:314:49
309.37:304:50
319.47:294:52

Solar energy in January

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in January, about 1.53 kWh/m².

For context, solar energy here swings from a low near 1.29 kWh/m² to a high of 7.88 kWh/m² in July across the year — January's 1.53 kWh/m² sits near the bottom.

00.511.522.5151015202531
Solar energy (kWh/m²)Level
11.3Dim
21.4Dim
31.4Dim
41.4Dim
51.4Dim
61.4Dim
71.4Dim
81.4Dim
91.4Dim
101.4Dim
111.4Dim
121.4Dim
131.5Dim
141.5Dim
151.5Dim
161.5Dim
171.5Dim
181.6Dim
191.6Dim
201.6Dim
211.6Dim
221.7Dim
231.7Dim
241.7Dim
251.8Dim
261.8Dim
271.8Dim
281.9Dim
291.9Dim
301.9Dim
312.0Dim
Planning a trip in January

Is January a good time to visit Hermiston?

Our two travel scores rate January for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

0.3
Sightseeing
11th-best month of the year
0.0
Beach & pool
10th-best month of the year

January is a weaker month for outdoor sightseeing in Hermiston.

What to pack for Hermiston in January

From January's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In January, Hermiston sees daytime highs around 42°F and nights near 31°F. Pack a warm layer. Worth having: a heavy coat and rain gear. About 10 days see rain.

a warm layera heavy coatrain gear

UV index in Hermiston in January

LowModerateHighVery highExtreme

Clear-sky midday UV in January peaks around 1. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hermiston peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 16UV 8Dec 15UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May7Very high
Jun7High
Jul8Very high
Aug6High
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Hermiston in January

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where January falls, not just the annual average.

Air quality in Hermiston is worst in August — around 25 µg/m³ PM2.5 (moderate), about 3.5× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1924 µg/m³Dec 217 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr10Good
May9Good
Jun9Good
Jul15Moderate
Aug25Moderate
Sep20Moderate
Oct11Good
Nov10Good
Dec7Good
Location & terrain

Where is Hermiston?

Hermiston sits at 45.8°N, 119.3°W, 459 ft above sea level, in United States. The nearest listed city is Kennewick, 27 mi away.

Topography around Hermiston

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Hermiston.

Within 2 miles, the terrain around Hermiston has only modest variations in elevation — a maximum elevation change of 236 ft around an average of 509 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 932 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,659 ft.

The land around Hermiston is covered by grassland (45%) and artificial surfaces (29%) within 2 miles, grassland (45%) and cropland (41%) within 10 miles, and grassland (54%) and cropland (35%) within 50 miles.

2 miles
236 ft
10 miles
932 ft
50 miles
5,659 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
January weather nearby: Kennewick 27 mi · Pendleton 27 mi · Tri-Cities 29 mi · Pasco 29 mi · Richland 31 mi · Sunnyside 48 mi · Walla Walla 48 mi · Yakima 78 mi

United States travel facts

Power plugs
Type A / B
120 V · 60 Hz
Prices
≈ 100% of US
price level, 2025
GDP per capita
$90,027
2025
Happiness
6.8 / 10
World Happiness, 2025
Safe drinking water
98%
of population, 2024
Homicide rate
5.8
per 100k, 2023
Road deaths
12.7
per 100k/yr, 2019
Income group
High
World Bank
Religion
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Hermiston (45.8404°, -119.2895°, elevation 459 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).