Hermiston weather in October

In October, Hermiston sees average daytime highs of 65°F and overnight lows near 45°F, with 1.0 in of precipitation across 5.9 wet days and about 10.7 hours of daylight. It is the 6th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 72°F in the first days to 58°F by the end. The sky is clear or mostly clear about 43% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 30 min at the start of October to 9 h 54 min by month's end. Set against the rest of the year, October is Hermiston's 5th-clearest and 8th-windiest month. For the whole year in context, see Hermiston's year-round climate.

Daytime high: 65°; 6th warmest
Overnight low: 45°; 7th coldest
Precipitation: 1.0 in; 5.9 wet days
Daylight: 10 h 42 min; 6:22 AM – 5:02 PM
Cloud cover: 48%; 5th clearest
Wind: 6 mph; 8th windiest
Solar energy: 3.19 kWh/m²
Travel score: 6.5; 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.

← September Hermiston year-round climate November →Best places to visit in October

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 72°F in the first days to 58°F by the end.

A typical October day in Hermiston reaches about 65°F in the afternoon and slips back to 45°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 74°F. Set against its neighbours, October runs about 15°F cooler than September and about 14°F warmer than November.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	73	72	72	71	70	70	69	69	68	68	67	67	66	66	65	65	64	64	63	63	62	62	61	61	60	59	59	58	58	57	57
Avg low (°F)	50	50	49	49	49	48	48	47	47	47	46	46	46	46	45	45	45	44	44	44	43	43	42	42	42	42	41	41	40	40	40

	Avg high (°F)	Avg low (°F)
1	73	50
2	72	50
3	72	49
4	71	49
5	70	49
6	70	48
7	69	48
8	69	47
9	68	47
10	68	47
11	67	46
12	67	46
13	66	46
14	66	46
15	65	45
16	65	45
17	64	45
18	64	44
19	63	44
20	63	44
21	62	43
22	62	43
23	61	42
24	61	42
25	60	42
26	59	42
27	59	41
28	58	41
29	58	40
30	57	40
31	57	40

How October really feels in Hermiston

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

Days feeling ≥ 90°F

heat index over the day's high

Days feeling ≤ 32°F

wind chill below the day's low

October sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Hermiston weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	42° / 31°	1.5	9.5	2.2	8.9	0.3
Feb	48° / 33°	1.2	7.7	1.5	10.1	1.8
Mar	56° / 38°	1.3	8.3	0.3	11.6	4.0
Apr	65° / 44°	1.0	6.3	0	13.3	6.2
May	74° / 51°	0.9	5.4	0	14.7	7.6
Jun	81° / 57°	0.6	3.3	0	15.5	7.4
Jul	91° / 63°	0.1	1	0	15.2	4.9
Aug	89° / 62°	0.2	1	0	13.9	5.3
Sep	79° / 55°	0.3	2.2	0	12.3	8.1
Oct	65° / 45°	1.0	5.9	0.1	10.7	6.5
Nov	50° / 36°	1.4	8.7	0.7	9.3	2.3
Dec	42° / 31°	1.6	9.6	2.6	8.5	0.2

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 16% of October, with mostly cloudy or overcast conditions the remaining 41%. Skies tend to cloud over as the month goes on.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	69	69	69	67	67	66	65	65	63	62	61	60	60	58	58	58	57	57	56	56	55	55	54	54	54	53	52	52	52	51	50
Cloudier (%)	31	31	31	33	33	34	35	35	37	38	39	40	40	42	42	42	43	43	44	44	45	45	46	46	46	47	48	48	48	49	50

	Clearer (%)	Cloudier (%)
1	69	31
2	69	31
3	69	31
4	67	33
5	67	33
6	66	34
7	65	35
8	65	35
9	63	37
10	62	38
11	61	39
12	60	40
13	60	40
14	58	42
15	58	42
16	58	42
17	57	43
18	57	43
19	56	44
20	56	44
21	55	45
22	55	45
23	54	46
24	54	46
25	54	46
26	53	47
27	52	48
28	52	48
29	52	48
30	51	49
31	50	50

Chance of precipitation in October

Any precipitation

Hermiston gets around 1.0 in of rain and snow over 5.9 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 18% and peaks near 27% on the wettest days, and about 0 day brings snow. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	12	13	13	13	14	14	15	15	15	15	15	16	16	16	16	17	17	18	19	19	20	21	22	23	23	24	24	25	26	26	27

	Rain chance (%)
1	12
2	13
3	13
4	13
5	14
6	14
7	15
8	15
9	15
10	15
11	15
12	16
13	16
14	16
15	16
16	17
17	17
18	18
19	19
20	19
21	20
22	21
23	22
24	23
25	23
26	24
27	24
28	25
29	26
30	26
31	27

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

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

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

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in October

Winds average 6 mph in October.

Across October, 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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6	6
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	6	calm
6	6	calm
7	6	calm
8	6	calm
9	6	calm
10	6	calm
11	6	calm
12	6	calm
13	6	calm
14	6	calm
15	6	calm
16	6	calm
17	6	calm
18	6	calm
19	6	calm
20	6	calm
21	6	calm
22	6	calm
23	6	calm
24	6	calm
25	6	calm
26	6	calm
27	6	calm
28	6	calm
29	6	calm
30	6	calm
31	6	calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 30 min at the start of October to 9 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 96 minutes over October. Sunrise moves from 6:01 AM to 6:43 AM, and sunset from 5:31 PM to 4:38 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.5	11.4	11.4	11.3	11.3	11.2	11.2	11.1	11.1	11.0	10.9	10.9	10.8	10.8	10.7	10.7	10.6	10.6	10.5	10.5	10.4	10.4	10.3	10.3	10.2	10.2	10.1	10.1	10.0	10.0	9.9
Sunrise (AM)	6:01	6:03	6:04	6:05	6:07	6:08	6:10	6:11	6:12	6:14	6:15	6:16	6:18	6:19	6:21	6:22	6:23	6:25	6:26	6:28	6:29	6:30	6:32	6:33	6:35	6:36	6:37	6:39	6:40	6:42	6:43
Sunset (PM)	5:31	5:29	5:27	5:25	5:23	5:21	5:19	5:17	5:15	5:13	5:12	5:10	5:08	5:06	5:04	5:02	5:01	4:59	4:57	4:56	4:54	4:52	4:51	4:49	4:47	4:46	4:44	4:43	4:41	4:40	4:38

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.5	6:01	5:31
2	11.4	6:03	5:29
3	11.4	6:04	5:27
4	11.3	6:05	5:25
5	11.3	6:07	5:23
6	11.2	6:08	5:21
7	11.2	6:10	5:19
8	11.1	6:11	5:17
9	11.1	6:12	5:15
10	11.0	6:14	5:13
11	10.9	6:15	5:12
12	10.9	6:16	5:10
13	10.8	6:18	5:08
14	10.8	6:19	5:06
15	10.7	6:21	5:04
16	10.7	6:22	5:02
17	10.6	6:23	5:01
18	10.6	6:25	4:59
19	10.5	6:26	4:57
20	10.5	6:28	4:56
21	10.4	6:29	4:54
22	10.4	6:30	4:52
23	10.3	6:32	4:51
24	10.3	6:33	4:49
25	10.2	6:35	4:47
26	10.2	6:36	4:46
27	10.1	6:37	4:44
28	10.1	6:39	4:43
29	10.0	6:40	4:41
30	10.0	6:42	4:40
31	9.9	6:43	4:38

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 3.19 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 — October's 3.19 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.1	4.0	4.0	3.9	3.8	3.8	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.2	3.2	3.1	3.1	3.0	3.0	2.9	2.9	2.8	2.8	2.7	2.6	2.6	2.5	2.5	2.5	2.4
Level	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.1	Bright
2	4.0	Bright
3	4.0	Moderate
4	3.9	Moderate
5	3.8	Moderate
6	3.8	Moderate
7	3.7	Moderate
8	3.6	Moderate
9	3.6	Moderate
10	3.5	Moderate
11	3.5	Moderate
12	3.4	Moderate
13	3.4	Moderate
14	3.3	Moderate
15	3.2	Moderate
16	3.2	Moderate
17	3.1	Moderate
18	3.1	Moderate
19	3.0	Moderate
20	3.0	Moderate
21	2.9	Moderate
22	2.9	Moderate
23	2.8	Moderate
24	2.8	Moderate
25	2.7	Moderate
26	2.6	Moderate
27	2.6	Moderate
28	2.5	Moderate
29	2.5	Moderate
30	2.5	Moderate
31	2.4	Moderate

Planning a trip in October

Is October a good time to visit Hermiston?

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

6.5

Sightseeing

4th-best month of the year

2.6

Beach & pool

6th-best month of the year

October is a reasonable time to visit Hermiston for sightseeing.

What to pack for Hermiston in October

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

In October, Hermiston sees daytime highs around 65°F and nights near 45°F. Worth packing: a warm layer. About 6 days see rain.

a warm layer

UV index in Hermiston in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 4 — enough to warrant sun protection. 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	4	5	7	7	8	6	5	4	1	1
Level	Low	Low	Moderate	Moderate	Very high	High	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	4	Moderate
Apr	5	Moderate
May	7	Very high
Jun	7	High
Jul	8	Very high
Aug	6	High
Sep	5	Moderate
Oct	4	Moderate
Nov	1	Low
Dec	1	Low

Air quality in Hermiston in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October 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).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	8	9	11	10	9	9	15	25	20	11	10	7
Level	Good	Good	Good	Good	Good	Good	Moderate	Moderate	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	8	Good
Feb	9	Good
Mar	11	Good
Apr	10	Good
May	9	Good
Jun	9	Good
Jul	15	Moderate
Aug	25	Moderate
Sep	20	Moderate
Oct	11	Good
Nov	10	Good
Dec	7	Good

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

grassland 45%

10 miles

932 ft

grassland 45%

50 miles

5,659 ft

grassland 54%

treesgrasslandcroplandartificial surfacesbare terrainwater

← September Hermiston year-round climate November →Best places to visit in October

October 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

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).

	Avg high (°F)	Avg low (°F)
1	73	50
2	72	50
3	72	49
4	71	49
5	70	49
6	70	48
7	69	48
8	69	47
9	68	47
10	68	47
11	67	46
12	67	46
13	66	46
14	66	46
15	65	45
16	65	45
17	64	45
18	64	44
19	63	44
20	63	44
21	62	43
22	62	43
23	61	42
24	61	42
25	60	42
26	59	42
27	59	41
28	58	41
29	58	40
30	57	40
31	57	40

	Clearer (%)	Cloudier (%)
1	69	31
2	69	31
3	69	31
4	67	33
5	67	33
6	66	34
7	65	35
8	65	35
9	63	37
10	62	38
11	61	39
12	60	40
13	60	40
14	58	42
15	58	42
16	58	42
17	57	43
18	57	43
19	56	44
20	56	44
21	55	45
22	55	45
23	54	46
24	54	46
25	54	46
26	53	47
27	52	48
28	52	48
29	52	48
30	51	49
31	50	50

	Rain chance (%)
1	12
2	13
3	13
4	13
5	14
6	14
7	15
8	15
9	15
10	15
11	15
12	16
13	16
14	16
15	16
16	17
17	17
18	18
19	19
20	19
21	20
22	21
23	22
24	23
25	23
26	24
27	24
28	25
29	26
30	26
31	27

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	73	50
2	72	50
3	72	49
4	71	49
5	70	49
6	70	48
7	69	48
8	69	47
9	68	47
10	68	47
11	67	46
12	67	46
13	66	46
14	66	46
15	65	45
16	65	45
17	64	45
18	64	44
19	63	44
20	63	44
21	62	43
22	62	43
23	61	42
24	61	42
25	60	42
26	59	42
27	59	41
28	58	41
29	58	40
30	57	40
31	57	40

	Clearer (%)	Cloudier (%)
1	69	31
2	69	31
3	69	31
4	67	33
5	67	33
6	66	34
7	65	35
8	65	35
9	63	37
10	62	38
11	61	39
12	60	40
13	60	40
14	58	42
15	58	42
16	58	42
17	57	43
18	57	43
19	56	44
20	56	44
21	55	45
22	55	45
23	54	46
24	54	46
25	54	46
26	53	47
27	52	48
28	52	48
29	52	48
30	51	49
31	50	50

	Rain chance (%)
1	12
2	13
3	13
4	13
5	14
6	14
7	15
8	15
9	15
10	15
11	15
12	16
13	16
14	16
15	16
16	17
17	17
18	18
19	19
20	19
21	20
22	21
23	22
24	23
25	23
26	24
27	24
28	25
29	26
30	26
31	27

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°F)	Avg low (°F)
1	73	50
2	72	50
3	72	49
4	71	49
5	70	49
6	70	48
7	69	48
8	69	47
9	68	47
10	68	47
11	67	46
12	67	46
13	66	46
14	66	46
15	65	45
16	65	45
17	64	45
18	64	44
19	63	44
20	63	44
21	62	43
22	62	43
23	61	42
24	61	42
25	60	42
26	59	42
27	59	41
28	58	41
29	58	40
30	57	40
31	57	40

	Clearer (%)	Cloudier (%)
1	69	31
2	69	31
3	69	31
4	67	33
5	67	33
6	66	34
7	65	35
8	65	35
9	63	37
10	62	38
11	61	39
12	60	40
13	60	40
14	58	42
15	58	42
16	58	42
17	57	43
18	57	43
19	56	44
20	56	44
21	55	45
22	55	45
23	54	46
24	54	46
25	54	46
26	53	47
27	52	48
28	52	48
29	52	48
30	51	49
31	50	50

	Rain chance (%)
1	12
2	13
3	13
4	13
5	14
6	14
7	15
8	15
9	15
10	15
11	15
12	16
13	16
14	16
15	16
16	17
17	17
18	18
19	19
20	19
21	20
22	21
23	22
24	23
25	23
26	24
27	24
28	25
29	26
30	26
31	27

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	100	0
8	100	0
9	100	0
10	100	0
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0