Green Valley weather in September

In September, Green Valley sees average daytime highs of 89°F and overnight lows near 66°F, with 1.4 in of rain across 5.6 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 87°F by the end. The sky is clear or mostly clear about 70% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Green Valley's 6th-clearest and 10th-windiest month. For the whole year in context, see Green Valley's year-round climate.

Daytime high: 89°; 4th warmest
Overnight low: 66°; 9th coldest
Rainfall: 1.4 in; 5.6 wet days
Daylight: 12 h 12 min; 6:13 AM – 6:24 PM
Cloud cover: 30%; 6th clearest
Wind: 5 mph; 10th windiest
Solar energy: 5.99 kWh/m²
Travel score: 5.1; out of 10

Green Valley is census-designated place in Pima County, Arizona, United States.

Density: 256/km²; people per km²

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

← August Green Valley 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 90°F in the first days to 87°F by the end.

A typical September day in Green Valley reaches about 89°F in the afternoon and slips back to 66°F overnight — a 23°F spread between the day's warmth and the night's chill. On most days the high lands between 81°F and 94°F. Set against its neighbours, September runs about 3°F cooler than August and about 7°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)	90	90	90	90	90	89	89	89	89	89	89	89	89	89	89	88	88	88	88	88	88	88	88	88	87	87	87	87	87	87
Avg low (°F)	69	69	68	68	68	68	68	68	67	67	67	67	67	67	66	66	66	66	65	65	65	65	65	64	64	64	63	63	63	62

	Avg high (°F)	Avg low (°F)
1	90	69
2	90	69
3	90	68
4	90	68
5	90	68
6	89	68
7	89	68
8	89	68
9	89	67
10	89	67
11	89	67
12	89	67
13	89	67
14	89	67
15	89	66
16	88	66
17	88	66
18	88	66
19	88	65
20	88	65
21	88	65
22	88	65
23	88	65
24	88	64
25	87	64
26	87	64
27	87	63
28	87	63
29	87	63
30	87	62

How September really feels in Green Valley

Once humidity and wind are folded in, September averages 5 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

The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Green Valley weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 3rd-wettest month here — the current month is highlighted below.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	63° / 38°	1.0	3.9	10.2	6.6
Feb	65° / 41°	1.0	4	10.8	7.1
Mar	71° / 46°	0.7	3	11.8	8.2
Apr	78° / 51°	0.2	1.5	12.8	8.8
May	87° / 58°	0.1	1.1	13.6	6.4
Jun	95° / 67°	0.3	2	14	3.4
Jul	93° / 72°	2.5	11.5	13.9	3.0
Aug	91° / 70°	2.3	11.6	13.2	3.6
Sep	89° / 66°	1.4	5.6	12.2	5.1
Oct	81° / 56°	0.7	2.8	11.2	7.9
Nov	71° / 46°	0.6	2.5	10.4	8.3
Dec	62° / 38°	1.1	4.2	10	6.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 70% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to open up 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 (%)	78	80	80	81	82	83	83	85	85	86	86	87	87	88	88	88	89	89	88	88	89	89	89	89	89	89	89	89	89	89
Cloudier (%)	22	20	20	19	18	17	17	15	15	14	14	13	13	12	12	12	11	11	12	12	11	11	11	11	11	11	11	11	11	11

	Clearer (%)	Cloudier (%)
1	78	22
2	80	20
3	80	20
4	81	19
5	82	18
6	83	17
7	83	17
8	85	15
9	85	15
10	86	14
11	86	14
12	87	13
13	87	13
14	88	12
15	88	12
16	88	12
17	89	11
18	89	11
19	88	12
20	88	12
21	89	11
22	89	11
23	89	11
24	89	11
25	89	11
26	89	11
27	89	11
28	89	11
29	89	11
30	89	11

Chance of precipitation in September

Any precipitation

Green Valley gets around 1.4 in of rain over 5.6 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 19% and peaks near 32% on the wettest days. The odds ease 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 (%)	32	31	30	29	28	27	26	25	24	23	22	21	21	20	19	18	17	16	15	14	14	13	13	12	12	12	11	11	11	11

	Rain chance (%)
1	32
2	31
3	30
4	29
5	28
6	27
7	26
8	25
9	24
10	23
11	22
12	21
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	14
22	13
23	13
24	12
25	12
26	12
27	11
28	11
29	11
30	11

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 56% 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 (%)	30	31	32	33	35	36	38	40	42	44	47	49	51	54	56	57	60	62	64	66	68	71	73	74	76	77	78	80	81	83
Comfortable (%)	25	25	26	26	26	27	27	27	27	26	26	25	25	24	23	23	22	21	20	19	18	17	16	15	14	14	13	12	12	11
Humid (%)	33	33	32	32	31	30	29	27	26	24	23	21	20	18	17	16	14	13	12	11	10	9	8	8	7	7	7	6	6	5
Muggy (%)	12	11	10	9	8	7	6	6	5	5	5	4	4	4	4	4	4	4	4	4	4	3	3	3	3	2	2	2	1	1

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	30	25	33	12
2	31	25	33	11
3	32	26	32	10
4	33	26	32	9
5	35	26	31	8
6	36	27	30	7
7	38	27	29	6
8	40	27	27	6
9	42	27	26	5
10	44	26	24	5
11	47	26	23	5
12	49	25	21	4
13	51	25	20	4
14	54	24	18	4
15	56	23	17	4
16	57	23	16	4
17	60	22	14	4
18	62	21	13	4
19	64	20	12	4
20	66	19	11	4
21	68	18	10	4
22	71	17	9	3
23	73	16	8	3
24	74	15	8	3
25	76	14	7	3
26	77	14	7	2
27	78	13	7	2
28	80	12	6	2
29	81	12	6	1
30	83	11	5	1

Wind in September

Winds average 5 mph in September.

Across September, daily wind ranges from about 5 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
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	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

	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	6	calm
28	6	calm
29	6	calm
30	6	calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 60 minutes over September. Sunrise moves from 6:03 AM to 6:22 AM, and sunset from 6:44 PM to 6:05 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)	12.7	12.7	12.6	12.6	12.6	12.5	12.5	12.5	12.4	12.4	12.4	12.3	12.3	12.3	12.2	12.2	12.2	12.1	12.1	12.1	12.0	12.0	12.0	11.9	11.9	11.9	11.8	11.8	11.8	11.7
Sunrise (AM)	6:03	6:04	6:04	6:05	6:06	6:06	6:07	6:08	6:08	6:09	6:09	6:10	6:11	6:11	6:12	6:13	6:13	6:14	6:14	6:15	6:16	6:16	6:17	6:18	6:18	6:19	6:20	6:20	6:21	6:22
Sunset (PM)	6:44	6:43	6:42	6:40	6:39	6:38	6:36	6:35	6:34	6:32	6:31	6:30	6:28	6:27	6:25	6:24	6:23	6:21	6:20	6:19	6:17	6:16	6:14	6:13	6:12	6:10	6:09	6:08	6:06	6:05

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.7	6:03	6:44
2	12.7	6:04	6:43
3	12.6	6:04	6:42
4	12.6	6:05	6:40
5	12.6	6:06	6:39
6	12.5	6:06	6:38
7	12.5	6:07	6:36
8	12.5	6:08	6:35
9	12.4	6:08	6:34
10	12.4	6:09	6:32
11	12.4	6:09	6:31
12	12.3	6:10	6:30
13	12.3	6:11	6:28
14	12.3	6:11	6:27
15	12.2	6:12	6:25
16	12.2	6:13	6:24
17	12.2	6:13	6:23
18	12.1	6:14	6:21
19	12.1	6:14	6:20
20	12.1	6:15	6:19
21	12.0	6:16	6:17
22	12.0	6:16	6:16
23	12.0	6:17	6:14
24	11.9	6:18	6:13
25	11.9	6:18	6:12
26	11.9	6:19	6:10
27	11.8	6:20	6:09
28	11.8	6:20	6:08
29	11.8	6:21	6:06
30	11.7	6:22	6:05

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.99 kWh/m².

For context, solar energy here swings from a low near 3.45 kWh/m² to a high of 8.29 kWh/m² in June across the year — September's 5.99 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)	6.2	6.2	6.2	6.1	6.1	6.1	6.1	6.1	6.1	6.1	6.0	6.0	6.0	6.0	6.0	6.0	6.0	6.0	5.9	5.9	5.9	5.9	5.9	5.9	5.8	5.8	5.8	5.8	5.8	5.8
Level	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Intense	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	6.2	Intense
2	6.2	Intense
3	6.2	Intense
4	6.1	Intense
5	6.1	Intense
6	6.1	Intense
7	6.1	Intense
8	6.1	Intense
9	6.1	Intense
10	6.1	Intense
11	6.0	Intense
12	6.0	Intense
13	6.0	Intense
14	6.0	Intense
15	6.0	Intense
16	6.0	Bright
17	6.0	Bright
18	6.0	Bright
19	5.9	Bright
20	5.9	Bright
21	5.9	Bright
22	5.9	Bright
23	5.9	Bright
24	5.9	Bright
25	5.8	Bright
26	5.8	Bright
27	5.8	Bright
28	5.8	Bright
29	5.8	Bright
30	5.8	Bright

Planning a trip in September

Is September a good time to visit Green Valley?

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

5.1

Sightseeing

9th-best month of the year

7.7

Beach & pool

4th-best month of the year

September is a reasonable time to visit Green Valley for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Green Valley in September

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

In September, Green Valley sees daytime highs around 89°F and nights near 66°F. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Green Valley in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Green Valley peaks around June 22 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 4 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	4	5	6	9	9	12	11	11	10	7	5	4
Level	Moderate	High	High	Very high	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

	UV index (midday)	Level
Jan	4	Moderate
Feb	5	High
Mar	6	High
Apr	9	Very high
May	9	Very high
Jun	12	Extreme
Jul	11	Extreme
Aug	11	Extreme
Sep	10	Very high
Oct	7	High
Nov	5	Moderate
Dec	4	Moderate

Location & terrain

Where is Green Valley?

Green Valley sits at 31.9°N, 111.0°W, 2,904 ft above sea level, in United States. The nearest listed city is Sahuarita, 7.5 mi away.

Topography around Green Valley

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

Within 2 miles, the terrain around Green Valley has only modest variations in elevation — a maximum elevation change of 351 ft around an average of 2,940 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,159 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,277 ft.

The land around Green Valley is covered by shrubs (46%) and artificial surfaces (33%) within 2 miles, shrubs (78%) within 10 miles, and shrubs (80%) within 50 miles.

2 miles

351 ft

shrubs 46%

10 miles

3,159 ft

shrubs 78%

50 miles

7,277 ft

shrubs 80%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

← August Green Valley year-round climate October →Best places to visit in September

September weather nearby: Sahuarita 7.5 mi · Drexel Heights 20 mi · Vail 21 mi · Tucson 25 mi · Rio Rico 27 mi · Flowing Wells 30 mi · Catalina Foothills 31 mi · Tanque Verde 31 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 Green Valley (31.8543°, -110.9937°, elevation 2,904 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. 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	90	69
2	90	69
3	90	68
4	90	68
5	90	68
6	89	68
7	89	68
8	89	68
9	89	67
10	89	67
11	89	67
12	89	67
13	89	67
14	89	67
15	89	66
16	88	66
17	88	66
18	88	66
19	88	65
20	88	65
21	88	65
22	88	65
23	88	65
24	88	64
25	87	64
26	87	64
27	87	63
28	87	63
29	87	63
30	87	62

	Clearer (%)	Cloudier (%)
1	78	22
2	80	20
3	80	20
4	81	19
5	82	18
6	83	17
7	83	17
8	85	15
9	85	15
10	86	14
11	86	14
12	87	13
13	87	13
14	88	12
15	88	12
16	88	12
17	89	11
18	89	11
19	88	12
20	88	12
21	89	11
22	89	11
23	89	11
24	89	11
25	89	11
26	89	11
27	89	11
28	89	11
29	89	11
30	89	11

	Rain chance (%)
1	32
2	31
3	30
4	29
5	28
6	27
7	26
8	25
9	24
10	23
11	22
12	21
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	14
22	13
23	13
24	12
25	12
26	12
27	11
28	11
29	11
30	11

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	30	25	33	12
2	31	25	33	11
3	32	26	32	10
4	33	26	32	9
5	35	26	31	8
6	36	27	30	7
7	38	27	29	6
8	40	27	27	6
9	42	27	26	5
10	44	26	24	5
11	47	26	23	5
12	49	25	21	4
13	51	25	20	4
14	54	24	18	4
15	56	23	17	4
16	57	23	16	4
17	60	22	14	4
18	62	21	13	4
19	64	20	12	4
20	66	19	11	4
21	68	18	10	4
22	71	17	9	3
23	73	16	8	3
24	74	15	8	3
25	76	14	7	3
26	77	14	7	2
27	78	13	7	2
28	80	12	6	2
29	81	12	6	1
30	83	11	5	1

	Avg high (°F)	Avg low (°F)
1	90	69
2	90	69
3	90	68
4	90	68
5	90	68
6	89	68
7	89	68
8	89	68
9	89	67
10	89	67
11	89	67
12	89	67
13	89	67
14	89	67
15	89	66
16	88	66
17	88	66
18	88	66
19	88	65
20	88	65
21	88	65
22	88	65
23	88	65
24	88	64
25	87	64
26	87	64
27	87	63
28	87	63
29	87	63
30	87	62

	Clearer (%)	Cloudier (%)
1	78	22
2	80	20
3	80	20
4	81	19
5	82	18
6	83	17
7	83	17
8	85	15
9	85	15
10	86	14
11	86	14
12	87	13
13	87	13
14	88	12
15	88	12
16	88	12
17	89	11
18	89	11
19	88	12
20	88	12
21	89	11
22	89	11
23	89	11
24	89	11
25	89	11
26	89	11
27	89	11
28	89	11
29	89	11
30	89	11

	Rain chance (%)
1	32
2	31
3	30
4	29
5	28
6	27
7	26
8	25
9	24
10	23
11	22
12	21
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	14
22	13
23	13
24	12
25	12
26	12
27	11
28	11
29	11
30	11

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	30	25	33	12
2	31	25	33	11
3	32	26	32	10
4	33	26	32	9
5	35	26	31	8
6	36	27	30	7
7	38	27	29	6
8	40	27	27	6
9	42	27	26	5
10	44	26	24	5
11	47	26	23	5
12	49	25	21	4
13	51	25	20	4
14	54	24	18	4
15	56	23	17	4
16	57	23	16	4
17	60	22	14	4
18	62	21	13	4
19	64	20	12	4
20	66	19	11	4
21	68	18	10	4
22	71	17	9	3
23	73	16	8	3
24	74	15	8	3
25	76	14	7	3
26	77	14	7	2
27	78	13	7	2
28	80	12	6	2
29	81	12	6	1
30	83	11	5	1

	Avg high (°F)	Avg low (°F)
1	90	69
2	90	69
3	90	68
4	90	68
5	90	68
6	89	68
7	89	68
8	89	68
9	89	67
10	89	67
11	89	67
12	89	67
13	89	67
14	89	67
15	89	66
16	88	66
17	88	66
18	88	66
19	88	65
20	88	65
21	88	65
22	88	65
23	88	65
24	88	64
25	87	64
26	87	64
27	87	63
28	87	63
29	87	63
30	87	62

	Clearer (%)	Cloudier (%)
1	78	22
2	80	20
3	80	20
4	81	19
5	82	18
6	83	17
7	83	17
8	85	15
9	85	15
10	86	14
11	86	14
12	87	13
13	87	13
14	88	12
15	88	12
16	88	12
17	89	11
18	89	11
19	88	12
20	88	12
21	89	11
22	89	11
23	89	11
24	89	11
25	89	11
26	89	11
27	89	11
28	89	11
29	89	11
30	89	11

	Rain chance (%)
1	32
2	31
3	30
4	29
5	28
6	27
7	26
8	25
9	24
10	23
11	22
12	21
13	21
14	20
15	19
16	18
17	17
18	16
19	15
20	14
21	14
22	13
23	13
24	12
25	12
26	12
27	11
28	11
29	11
30	11

	Dry (%)	Comfortable (%)	Humid (%)	Muggy (%)
1	30	25	33	12
2	31	25	33	11
3	32	26	32	10
4	33	26	32	9
5	35	26	31	8
6	36	27	30	7
7	38	27	29	6
8	40	27	27	6
9	42	27	26	5
10	44	26	24	5
11	47	26	23	5
12	49	25	21	4
13	51	25	20	4
14	54	24	18	4
15	56	23	17	4
16	57	23	16	4
17	60	22	14	4
18	62	21	13	4
19	64	20	12	4
20	66	19	11	4
21	68	18	10	4
22	71	17	9	3
23	73	16	8	3
24	74	15	8	3
25	76	14	7	3
26	77	14	7	2
27	78	13	7	2
28	80	12	6	2
29	81	12	6	1
30	83	11	5	1