The Dalles weather in September

In September, The Dalles sees average daytime highs of 74°F and overnight lows near 50°F, with 0.8 in of rain across 3.2 wet days and about 12.3 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 78°F in the first days to 69°F by the end. The sky is clear or mostly clear about 57% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is The Dalles's 3rd-clearest and 6th-windiest month. For the whole year in context, see The Dalles's year-round climate.

Daytime high: 74°; 3rd warmest
Overnight low: 50°; 9th coldest
Rainfall: 0.8 in; 3.2 wet days
Daylight: 12 h 18 min; 5:50 AM – 6:09 PM
Cloud cover: 36%; 3rd clearest
Wind: 5 mph; 6th windiest
Solar energy: 4.93 kWh/m²
Travel score: 8.2; out of 10

The Dalles is city in and county seat of Wasco County, Oregon, United States.

Density: 854/km²; people per km²
Founded: 1857

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

← August The Dalles year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 78°F in the first days to 69°F by the end.

A typical September day in The Dalles reaches about 74°F in the afternoon and slips back to 50°F overnight — a 24°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 86°F. Set against its neighbours, September runs about 8°F cooler than August and about 14°F warmer than October.

	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
Avg high (°F)	79	79	78	78	78	77	77	77	76	76	76	75	75	75	74	74	74	73	73	73	72	72	72	71	71	70	70	69	69	68
Avg low (°F)	53	52	52	52	52	52	51	51	51	51	51	51	50	50	50	50	49	49	49	49	49	48	48	48	47	47	47	47	47	46

	Avg high (°F)	Avg low (°F)
1	79	53
2	79	52
3	78	52
4	78	52
5	78	52
6	77	52
7	77	51
8	77	51
9	76	51
10	76	51
11	76	51
12	75	51
13	75	50
14	75	50
15	74	50
16	74	50
17	74	49
18	73	49
19	73	49
20	73	49
21	72	49
22	72	48
23	72	48
24	71	48
25	71	47
26	70	47
27	70	47
28	69	47
29	69	47
30	68	46

How September really feels in The Dalles

Once humidity and wind are folded in, September 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

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

The Dalles weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	39° / 29°	4.6	14.6	6.7	8.9	0.0
Feb	44° / 30°	3.6	12.8	5.2	10.1	0.6
Mar	51° / 34°	3.4	13.6	3.1	11.6	2.2
Apr	57° / 39°	2.3	11.4	0.4	13.3	3.9
May	66° / 45°	1.6	7.9	0	14.7	6.3
Jun	73° / 50°	0.9	5.1	0	15.4	7.7
Jul	82° / 55°	0.3	1.7	0	15.1	7.7
Aug	83° / 55°	0.3	1.9	0	13.9	7.6
Sep	74° / 50°	0.8	3.2	0	12.3	8.2
Oct	60° / 42°	2.3	8.4	0.2	10.7	5.2
Nov	46° / 34°	4.1	13.5	2.4	9.3	1.2
Dec	38° / 28°	5.3	15.3	7.7	8.6	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 57% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 27%. 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
Clearer (%)	82	82	82	80	80	79	78	77	76	75	73	73	72	71	71	70	70	69	69	70	69	69	69	69	69	68	68	68	67	66
Cloudier (%)	18	18	18	20	20	21	22	23	24	25	27	27	28	29	29	30	30	31	31	30	31	31	31	31	31	32	32	32	33	34

	Clearer (%)	Cloudier (%)
1	82	18
2	82	18
3	82	18
4	80	20
5	80	20
6	79	21
7	78	22
8	77	23
9	76	24
10	75	25
11	73	27
12	73	27
13	72	28
14	71	29
15	71	29
16	70	30
17	70	30
18	69	31
19	69	31
20	70	30
21	69	31
22	69	31
23	69	31
24	69	31
25	69	31
26	68	32
27	68	32
28	68	32
29	67	33
30	66	34

Chance of precipitation in September

Any precipitation

The Dalles gets around 0.8 in of rain over 3.2 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 12% and peaks near 17% on the wettest days. 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
Rain chance (%)	7	7	7	7	8	8	8	9	9	10	11	11	11	12	12	12	12	13	13	13	13	14	14	14	14	15	15	16	16	17

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

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 98% 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
Dry (%)	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	98	99	99	99
Comfortable (%)	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	1	1	1

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	99	1
29	99	1
30	99	1

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 mph on the calmest days to 5 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
Wind speed (mph)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
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

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 96 minutes over September. Sunrise moves from 5:31 AM to 6:08 AM, and sunset from 6:38 PM to 5:40 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
Daylight (h)	13.1	13.1	13.0	13.0	12.9	12.9	12.8	12.8	12.7	12.6	12.6	12.5	12.5	12.4	12.4	12.3	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.8	11.7	11.7	11.6	11.5
Sunrise (AM)	5:31	5:32	5:33	5:34	5:36	5:37	5:38	5:39	5:41	5:42	5:43	5:44	5:46	5:47	5:48	5:50	5:51	5:52	5:53	5:55	5:56	5:57	5:59	6:00	6:01	6:02	6:04	6:05	6:06	6:08
Sunset (PM)	6:38	6:36	6:34	6:32	6:30	6:29	6:27	6:25	6:23	6:21	6:19	6:17	6:15	6:13	6:11	6:09	6:06	6:04	6:02	6:00	5:58	5:56	5:54	5:52	5:50	5:48	5:46	5:44	5:42	5:40

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.1	5:31	6:38
2	13.1	5:32	6:36
3	13.0	5:33	6:34
4	13.0	5:34	6:32
5	12.9	5:36	6:30
6	12.9	5:37	6:29
7	12.8	5:38	6:27
8	12.8	5:39	6:25
9	12.7	5:41	6:23
10	12.6	5:42	6:21
11	12.6	5:43	6:19
12	12.5	5:44	6:17
13	12.5	5:46	6:15
14	12.4	5:47	6:13
15	12.4	5:48	6:11
16	12.3	5:50	6:09
17	12.3	5:51	6:06
18	12.2	5:52	6:04
19	12.2	5:53	6:02
20	12.1	5:55	6:00
21	12.0	5:56	5:58
22	12.0	5:57	5:56
23	11.9	5:59	5:54
24	11.9	6:00	5:52
25	11.8	6:01	5:50
26	11.8	6:02	5:48
27	11.7	6:04	5:46
28	11.7	6:05	5:44
29	11.6	6:06	5:42
30	11.5	6:08	5:40

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.93 kWh/m².

For context, solar energy here swings from a low near 1.24 kWh/m² to a high of 7.69 kWh/m² in July across the year — September's 4.93 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
Solar energy (kWh/m²)	5.8	5.8	5.7	5.7	5.6	5.5	5.5	5.4	5.3	5.3	5.2	5.1	5.1	5.0	4.9	4.9	4.8	4.7	4.7	4.6	4.5	4.5	4.4	4.4	4.3	4.2	4.2	4.1	4.0	4.0
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate

	Solar energy (kWh/m²)	Level
1	5.8	Bright
2	5.8	Bright
3	5.7	Bright
4	5.7	Bright
5	5.6	Bright
6	5.5	Bright
7	5.5	Bright
8	5.4	Bright
9	5.3	Bright
10	5.3	Bright
11	5.2	Bright
12	5.1	Bright
13	5.1	Bright
14	5.0	Bright
15	4.9	Bright
16	4.9	Bright
17	4.8	Bright
18	4.7	Bright
19	4.7	Bright
20	4.6	Bright
21	4.5	Bright
22	4.5	Bright
23	4.4	Bright
24	4.4	Bright
25	4.3	Bright
26	4.2	Bright
27	4.2	Bright
28	4.1	Bright
29	4.0	Bright
30	4.0	Moderate

Planning a trip in September

Hazard calendar for The Dalles

In seasonPeak

None of The Dalles's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

The Dalles's rainy season runs November–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is September a good time to visit The Dalles?

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

8.2

Sightseeing

1st-best month of the year

6.4

Beach & pool

3rd-best month of the year

September is one of the better times to visit The Dalles for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for The Dalles in September

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

In September, The Dalles sees daytime highs around 74°F and nights near 50°F. Worth packing: light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in The Dalles in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in The Dalles peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 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)	2	2	4	5	8	7	9	7	5	4	1	1
Level	Low	Moderate	Moderate	High	Very high	High	Very high	High	Moderate	Moderate	Low	Low

	UV index (midday)	Level
Jan	2	Low
Feb	2	Moderate
Mar	4	Moderate
Apr	5	High
May	8	Very high
Jun	7	High
Jul	9	Very high
Aug	7	High
Sep	5	Moderate
Oct	4	Moderate
Nov	1	Low
Dec	1	Low

Air quality in The Dalles in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in The Dalles is worst in August — around 43 µg/m³ PM2.5 (poor), about 8.8× the cleanest month (December, 5 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)	5	6	8	8	8	8	8	43	29	10	9	5
Level	Good	Good	Good	Good	Good	Good	Good	Poor	Moderate	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	5	Good
Feb	6	Good
Mar	8	Good
Apr	8	Good
May	8	Good
Jun	8	Good
Jul	8	Good
Aug	43	Poor
Sep	29	Moderate
Oct	10	Good
Nov	9	Good
Dec	5	Good

Location & terrain

Where is The Dalles?

The Dalles sits at 45.6°N, 121.2°W, 253 ft above sea level, in United States. The nearest listed city is Washougal, 57 mi away.

Topography around The Dalles

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

Within 2 miles, the terrain around The Dalles has significant variations in elevation — a maximum elevation change of 1,047 ft around an average of 397 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,140 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 12,215 ft.

The land around The Dalles is covered by trees (38%), grassland (29%) and artificial surfaces (22%) within 2 miles, grassland (58%) and trees (24%) within 10 miles, and trees (50%) and grassland (39%) within 50 miles.

2 miles

1,047 ft

trees 38%

10 miles

3,140 ft

grassland 58%

50 miles

12,215 ft

trees 50%

treesgrasslandcroplandartificial surfacesbare terrainwater

← August The Dalles year-round climate October →Best places to visit in September

September weather nearby: Washougal 57 mi · Troutdale 58 mi · Camas 59 mi · Gresham 61 mi · Happy Valley 66 mi · Battle Ground 66 mi · Orchards 67 mi · Lents 68 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 The Dalles (45.5946°, -121.1787°, elevation 253 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	79	53
2	79	52
3	78	52
4	78	52
5	78	52
6	77	52
7	77	51
8	77	51
9	76	51
10	76	51
11	76	51
12	75	51
13	75	50
14	75	50
15	74	50
16	74	50
17	74	49
18	73	49
19	73	49
20	73	49
21	72	49
22	72	48
23	72	48
24	71	48
25	71	47
26	70	47
27	70	47
28	69	47
29	69	47
30	68	46

	Clearer (%)	Cloudier (%)
1	82	18
2	82	18
3	82	18
4	80	20
5	80	20
6	79	21
7	78	22
8	77	23
9	76	24
10	75	25
11	73	27
12	73	27
13	72	28
14	71	29
15	71	29
16	70	30
17	70	30
18	69	31
19	69	31
20	70	30
21	69	31
22	69	31
23	69	31
24	69	31
25	69	31
26	68	32
27	68	32
28	68	32
29	67	33
30	66	34

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	99	1
29	99	1
30	99	1

	Avg high (°F)	Avg low (°F)
1	79	53
2	79	52
3	78	52
4	78	52
5	78	52
6	77	52
7	77	51
8	77	51
9	76	51
10	76	51
11	76	51
12	75	51
13	75	50
14	75	50
15	74	50
16	74	50
17	74	49
18	73	49
19	73	49
20	73	49
21	72	49
22	72	48
23	72	48
24	71	48
25	71	47
26	70	47
27	70	47
28	69	47
29	69	47
30	68	46

	Clearer (%)	Cloudier (%)
1	82	18
2	82	18
3	82	18
4	80	20
5	80	20
6	79	21
7	78	22
8	77	23
9	76	24
10	75	25
11	73	27
12	73	27
13	72	28
14	71	29
15	71	29
16	70	30
17	70	30
18	69	31
19	69	31
20	70	30
21	69	31
22	69	31
23	69	31
24	69	31
25	69	31
26	68	32
27	68	32
28	68	32
29	67	33
30	66	34

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	99	1
29	99	1
30	99	1

	Avg high (°F)	Avg low (°F)
1	79	53
2	79	52
3	78	52
4	78	52
5	78	52
6	77	52
7	77	51
8	77	51
9	76	51
10	76	51
11	76	51
12	75	51
13	75	50
14	75	50
15	74	50
16	74	50
17	74	49
18	73	49
19	73	49
20	73	49
21	72	49
22	72	48
23	72	48
24	71	48
25	71	47
26	70	47
27	70	47
28	69	47
29	69	47
30	68	46

	Clearer (%)	Cloudier (%)
1	82	18
2	82	18
3	82	18
4	80	20
5	80	20
6	79	21
7	78	22
8	77	23
9	76	24
10	75	25
11	73	27
12	73	27
13	72	28
14	71	29
15	71	29
16	70	30
17	70	30
18	69	31
19	69	31
20	70	30
21	69	31
22	69	31
23	69	31
24	69	31
25	69	31
26	68	32
27	68	32
28	68	32
29	67	33
30	66	34

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

	Dry (%)	Comfortable (%)
1	98	2
2	98	2
3	98	2
4	98	2
5	98	2
6	98	2
7	98	2
8	98	2
9	98	2
10	98	2
11	98	2
12	98	2
13	98	2
14	98	2
15	98	2
16	98	2
17	98	2
18	98	2
19	98	2
20	98	2
21	98	2
22	98	2
23	98	2
24	98	2
25	98	2
26	98	2
27	98	2
28	99	1
29	99	1
30	99	1