Grants Pass weather in September

In September, Grants Pass sees average daytime highs of 79°F and overnight lows near 51°F, with 0.7 in of rain across 3 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 82°F in the first days to 75°F by the end. The sky is clear or mostly clear about 65% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Grants Pass's 3rd-clearest and 6th-windiest month. For the whole year in context, see Grants Pass's year-round climate.

Daytime high
79°
3rd warmest
Overnight low
51°
10th coldest
Rainfall
0.7 in
3 wet days
Daylight
12 h 18 min
5:59 AM – 6:16 PM
Cloud cover
29%
3rd clearest
Wind
3 mph
6th windiest
Solar energy
5.33 kWh/m²
Travel score
8.3
out of 10

Grants Pass is city in and county seat of Josephine County, Oregon, United States.

Density
1,235/km²
people per km²
Founded
1865

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 82°F in the first days to 75°F by the end.

A typical September day in Grants Pass reaches about 79°F in the afternoon and slips back to 51°F overnight — a 28°F spread between the day's warmth and the night's chill. On most days the high lands between 66°F and 91°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18353
28253
38253
48253
58253
68252
78152
88152
98152
108152
118052
128051
138051
147951
157951
167951
177850
187850
197850
207850
217749
227749
237749
247649
257649
267648
277548
287548
297447
307447

How September really feels in Grants Pass

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
0
heat index over the day's high
Days feeling ≤ 32°F
0
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.

Grants Pass 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.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 32°5.214.249.21.3
Feb51° / 34°4.212.73.510.32.2
Mar55° / 36°4.614.72.811.63.2
Apr60° / 39°3.213.11.513.14.4
May68° / 45°2.39.3014.46.5
Jun75° / 50°1.04.30158.0
Jul85° / 56°0.31.4014.86.9
Aug85° / 55°0.41.6013.76.8
Sep79° / 51°0.73012.38.3
Oct66° / 43°2.17010.86.7
Nov52° / 36°4.5131.69.62.6
Dec45° / 32°6.714.74.48.90.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 65% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 15% of September, with mostly cloudy or overcast conditions the remaining 20%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18812
28812
38713
48713
58614
68515
78416
88416
98218
108218
118119
128020
137921
147921
157921
167921
177822
187822
197723
207822
217822
227822
237723
247723
257723
267624
277624
287525
297426
307426

Chance of precipitation in September

Any precipitation

Grants Pass gets around 0.7 in of rain over 3 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 10% and peaks near 15% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)
15
25
35
45
55
66
76
87
97
108
119
129
1310
1410
1510
1611
1711
1812
1912
2013
2113
2213
2313
2414
2514
2614
2714
2815
2915
3015

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.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1964
2964
3964
4973
5973
6973
7973
8973
9973
10973
11973
12973
13973
14973
15973
16973
17982
18982
19982
20982
21982
22982
23982
24991
25991
26991
27991
28991
29991
30991

Wind in September

Winds average 3 mph in September.

Across September, daily wind ranges from about 3 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours at the start of September to 11 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 84 minutes over September. Sunrise moves from 5:43 AM to 6:15 AM, and sunset from 6:43 PM to 5:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.05:436:43
213.05:446:42
312.95:456:40
412.95:466:38
512.85:476:36
612.85:486:34
712.75:496:33
812.75:506:31
912.65:516:29
1012.65:536:27
1112.55:546:25
1212.55:556:23
1312.45:566:22
1412.45:576:20
1512.35:586:18
1612.35:596:16
1712.26:006:14
1812.26:016:12
1912.16:026:11
2012.16:046:09
2112.06:056:07
2212.06:066:05
2311.96:076:03
2411.96:086:01
2511.86:096:00
2611.86:105:58
2711.76:115:56
2811.76:135:54
2911.66:145:52
3011.66:155:50

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.33 kWh/m².

For context, solar energy here swings from a low near 1.47 kWh/m² to a high of 7.8 kWh/m² in July across the year — September's 5.33 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.2Intense
26.1Intense
36.1Intense
46.0Intense
56.0Bright
65.9Bright
75.8Bright
85.8Bright
95.7Bright
105.7Bright
115.6Bright
125.5Bright
135.5Bright
145.4Bright
155.3Bright
165.3Bright
175.2Bright
185.1Bright
195.1Bright
205.0Bright
215.0Bright
224.9Bright
234.8Bright
244.8Bright
254.7Bright
264.7Bright
274.6Bright
284.5Bright
294.5Bright
304.4Bright
Planning a trip in September

Hazard calendar for Grants Pass

In seasonPeak

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

Grants Pass's rainy season runs November–April, 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 Grants Pass?

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

8.3
Sightseeing
1st-best month of the year
7.8
Beach & pool
3rd-best month of the year

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

What to pack for Grants Pass in September

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

In September, Grants Pass sees daytime highs around 79°F and nights near 51°F. Worth packing: light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in Grants Pass 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 Grants Pass peaks around July 12 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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 12UV 9Dec 17UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar5Moderate
Apr6High
May9Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep5High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Grants Pass 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 Grants Pass is worst in September — around 56 µg/m³ PM2.5 (unhealthy), about 10.4× the cleanest month (January, 5 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateSep 1452 µg/m³Jan 216 µg/m³
PM2.5 (µg/m³)Level
Jan5Good
Feb7Good
Mar8Good
Apr9Good
May8Good
Jun7Good
Jul15Moderate
Aug32Moderate
Sep56Unhealthy
Oct9Good
Nov14Moderate
Dec14Moderate
Location & terrain

Where is Grants Pass?

Grants Pass sits at 42.4°N, 123.3°W, 945 ft above sea level, in United States. The nearest listed city is Central Point, 22 mi away.

Topography around Grants Pass

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

Within 2 miles, the terrain around Grants Pass has significant variations in elevation — a maximum elevation change of 1,247 ft around an average of 1,063 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,776 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,421 ft.

The land around Grants Pass is covered by artificial surfaces (43%) and trees (41%) within 2 miles, trees (85%) within 10 miles, and trees (89%) within 50 miles.

2 miles
1,247 ft
10 miles
3,776 ft
50 miles
7,421 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Central Point 22 mi · Medford 24 mi · Ashland 36 mi · Roseburg 53 mi · Coos Bay 78 mi · Klamath Falls 81 mi · Altamont 83 mi · McKinleyville 111 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 Grants Pass (42.4393°, -123.3307°, elevation 945 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).