Parker weather in September

In September, Parker sees average daytime highs of 76°F and overnight lows near 48°F, with 1.2 in of precipitation across 5.7 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 8th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 71°F by the end. The sky is clear or mostly clear about 56% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 54 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Parker's 3rd-clearest and 9th-windiest month. For the whole year in context, see Parker's year-round climate.

Daytime high: 76°; 4th warmest
Overnight low: 48°; 9th coldest
Precipitation: 1.2 in; 5.7 wet days
Daylight: 12 h 18 min; 5:46 AM – 6:01 PM
Cloud cover: 38%; 3rd clearest
Wind: 6 mph; 9th windiest
Solar energy: 5.53 kWh/m²
Travel score: 7.7; out of 10

Parker is town in Douglas County, Colorado, United States.

Density: 934/km²; people per km²
Founded: 1981

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

← August Parker 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 80°F in the first days to 71°F by the end.

A typical September day in Parker reaches about 76°F in the afternoon and slips back to 48°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 63°F and 86°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°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)	81	80	80	80	80	79	79	78	78	78	77	77	76	76	76	75	75	75	74	74	74	73	73	73	72	72	72	71	71	70
Avg low (°F)	54	54	53	53	53	52	52	51	51	51	50	50	49	49	49	48	48	47	47	47	46	46	46	45	45	44	44	44	43	43

	Avg high (°F)	Avg low (°F)
1	81	54
2	80	54
3	80	53
4	80	53
5	80	53
6	79	52
7	79	52
8	78	51
9	78	51
10	78	51
11	77	50
12	77	50
13	76	49
14	76	49
15	76	49
16	75	48
17	75	48
18	75	47
19	74	47
20	74	47
21	74	46
22	73	46
23	73	46
24	73	45
25	72	45
26	72	44
27	72	44
28	71	44
29	71	43
30	70	43

How September really feels in Parker

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.

Parker weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 8th-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° / 17°	0.6	4.3	4.6	9.5	0.3
Feb	44° / 19°	0.6	4.6	4.8	10.4	1.0
Mar	52° / 26°	1.6	6.9	5.5	11.7	3.2
Apr	58° / 32°	2.5	8.8	5.1	13	4.5
May	68° / 42°	2.9	10.6	1.4	14.1	6.2
Jun	80° / 52°	2.0	9	0	14.7	6.7
Jul	85° / 58°	2.1	9.4	0	14.5	5.5
Aug	83° / 56°	1.7	8.3	0	13.6	6.3
Sep	76° / 48°	1.2	5.7	0.4	12.3	7.7
Oct	63° / 36°	1.4	5.3	2.2	10.9	6.4
Nov	50° / 25°	0.9	5	4.5	9.8	2.8
Dec	41° / 17°	0.7	3.8	4.1	9.3	0.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 19% of September, with mostly cloudy or overcast conditions the remaining 26%. 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 (%)	74	74	74	74	74	74	74	74	74	75	74	75	75	75	75	75	75	75	76	75	75	75	75	75	74	74	74	74	74	74
Cloudier (%)	26	26	26	26	26	26	26	26	26	25	26	25	25	25	25	25	25	25	24	25	25	25	25	25	26	26	26	26	26	26

	Clearer (%)	Cloudier (%)
1	74	26
2	74	26
3	74	26
4	74	26
5	74	26
6	74	26
7	74	26
8	74	26
9	74	26
10	75	25
11	74	26
12	75	25
13	75	25
14	75	25
15	75	25
16	75	25
17	75	25
18	75	25
19	76	24
20	75	25
21	75	25
22	75	25
23	75	25
24	75	25
25	74	26
26	74	26
27	74	26
28	74	26
29	74	26
30	74	26

Chance of precipitation in September

Any precipitationSnow

Parker gets around 1.2 in of rain and snow over 5.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 20% and peaks near 22% on the wettest days, and about 0 day brings snow.

	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 (%)	22	22	22	22	22	22	22	22	22	22	21	21	21	21	21	21	20	20	19	19	18	18	17	17	17	17	17	17	17	17
Snow chance (%)	0	1	1	1	1	1	1	1	1	1	1	1	1	1	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2	2

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

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 99% 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 (%)	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	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	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
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

Wind in September

Winds average 6 mph in September.

Across September, 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
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
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	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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 54 min 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 78 minutes over September. Sunrise moves from 5:31 AM to 5:59 AM, and sunset from 6:26 PM to 5:37 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)	12.9	12.9	12.8	12.8	12.7	12.7	12.7	12.6	12.6	12.5	12.5	12.4	12.4	12.3	12.3	12.3	12.2	12.2	12.1	12.1	12.0	12.0	11.9	11.9	11.9	11.8	11.8	11.7	11.7	11.6
Sunrise (AM)	5:31	5:32	5:33	5:34	5:35	5:36	5:37	5:38	5:39	5:40	5:41	5:42	5:43	5:44	5:45	5:46	5:47	5:48	5:49	5:50	5:51	5:51	5:52	5:53	5:54	5:55	5:56	5:57	5:58	5:59
Sunset (PM)	6:26	6:24	6:23	6:21	6:20	6:18	6:16	6:15	6:13	6:11	6:09	6:08	6:06	6:04	6:03	6:01	5:59	5:58	5:56	5:54	5:53	5:51	5:49	5:47	5:46	5:44	5:42	5:41	5:39	5:37

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.9	5:31	6:26
2	12.9	5:32	6:24
3	12.8	5:33	6:23
4	12.8	5:34	6:21
5	12.7	5:35	6:20
6	12.7	5:36	6:18
7	12.7	5:37	6:16
8	12.6	5:38	6:15
9	12.6	5:39	6:13
10	12.5	5:40	6:11
11	12.5	5:41	6:09
12	12.4	5:42	6:08
13	12.4	5:43	6:06
14	12.3	5:44	6:04
15	12.3	5:45	6:03
16	12.3	5:46	6:01
17	12.2	5:47	5:59
18	12.2	5:48	5:58
19	12.1	5:49	5:56
20	12.1	5:50	5:54
21	12.0	5:51	5:53
22	12.0	5:51	5:51
23	11.9	5:52	5:49
24	11.9	5:53	5:47
25	11.9	5:54	5:46
26	11.8	5:55	5:44
27	11.8	5:56	5:42
28	11.7	5:57	5:41
29	11.7	5:58	5:39
30	11.6	5:59	5:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.53 kWh/m².

For context, solar energy here swings from a low near 2.54 kWh/m² to a high of 7.44 kWh/m² in June across the year — September's 5.53 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)	6.1	6.0	6.0	6.0	5.9	5.9	5.9	5.8	5.8	5.7	5.7	5.7	5.6	5.6	5.5	5.5	5.5	5.4	5.4	5.3	5.3	5.2	5.2	5.2	5.1	5.1	5.0	5.0	4.9	4.9
Level	Intense	Intense	Intense	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

	Solar energy (kWh/m²)	Level
1	6.1	Intense
2	6.0	Intense
3	6.0	Intense
4	6.0	Bright
5	5.9	Bright
6	5.9	Bright
7	5.9	Bright
8	5.8	Bright
9	5.8	Bright
10	5.7	Bright
11	5.7	Bright
12	5.7	Bright
13	5.6	Bright
14	5.6	Bright
15	5.5	Bright
16	5.5	Bright
17	5.5	Bright
18	5.4	Bright
19	5.4	Bright
20	5.3	Bright
21	5.3	Bright
22	5.2	Bright
23	5.2	Bright
24	5.2	Bright
25	5.1	Bright
26	5.1	Bright
27	5.0	Bright
28	5.0	Bright
29	4.9	Bright
30	4.9	Bright

Planning a trip in September

Is September a good time to visit Parker?

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

7.7

Sightseeing

1st-best month of the year

6.5

Beach & pool

4th-best month of the year

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

What to pack for Parker in September

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

In September, Parker sees daytime highs around 76°F and nights near 48°F. Worth packing: light clothes and sun protection. About 6 days see rain.

light clothessun protection

UV index in Parker in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Parker peaks around July 13 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 23 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	2	4	7	6	8	11	11	10	7	5	4	2
Level	Moderate	Moderate	High	High	Very high	Extreme	Extreme	Very high	Very high	High	Moderate	Low

	UV index (midday)	Level
Jan	2	Moderate
Feb	4	Moderate
Mar	7	High
Apr	6	High
May	8	Very high
Jun	11	Extreme
Jul	11	Extreme
Aug	10	Very high
Sep	7	Very high
Oct	5	High
Nov	4	Moderate
Dec	2	Low

Air quality in Parker 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 Parker is worst in August — around 21 µg/m³ PM2.5 (moderate), about 1.6× the cleanest month (May, 13 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)	17	15	16	13	13	14	14	21	13	15	15	16
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	17	Moderate
Feb	15	Moderate
Mar	16	Moderate
Apr	13	Moderate
May	13	Moderate
Jun	14	Moderate
Jul	14	Moderate
Aug	21	Moderate
Sep	13	Moderate
Oct	15	Moderate
Nov	15	Moderate
Dec	16	Moderate

Location & terrain

Where is Parker?

Parker sits at 39.5°N, 104.8°W, 5,869 ft above sea level, in United States. The nearest listed city is Centennial, 7.5 mi away.

Topography around Parker

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

Within 2 miles, the terrain around Parker has only modest variations in elevation — a maximum elevation change of 427 ft around an average of 5,928 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,188 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,459 ft.

The land around Parker is covered by grassland (48%) and artificial surfaces (40%) within 2 miles, grassland (66%) and artificial surfaces (21%) within 10 miles, and grassland (55%) and trees (25%) within 50 miles.

2 miles

427 ft

grassland 48%

10 miles

1,188 ft

grassland 66%

50 miles

9,459 ft

grassland 55%

treesgrasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Centennial 7.5 mi · Castlewood 8.7 mi · Southglenn 11 mi · Castle Rock 11 mi · Highlands Ranch 11 mi · Greenwood Village 12 mi · Englewood 15 mi · Aurora 15 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 Parker (39.5186°, -104.7614°, elevation 5,869 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	81	54
2	80	54
3	80	53
4	80	53
5	80	53
6	79	52
7	79	52
8	78	51
9	78	51
10	78	51
11	77	50
12	77	50
13	76	49
14	76	49
15	76	49
16	75	48
17	75	48
18	75	47
19	74	47
20	74	47
21	74	46
22	73	46
23	73	46
24	73	45
25	72	45
26	72	44
27	72	44
28	71	44
29	71	43
30	70	43

	Clearer (%)	Cloudier (%)
1	74	26
2	74	26
3	74	26
4	74	26
5	74	26
6	74	26
7	74	26
8	74	26
9	74	26
10	75	25
11	74	26
12	75	25
13	75	25
14	75	25
15	75	25
16	75	25
17	75	25
18	75	25
19	76	24
20	75	25
21	75	25
22	75	25
23	75	25
24	75	25
25	74	26
26	74	26
27	74	26
28	74	26
29	74	26
30	74	26

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
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

	Avg high (°F)	Avg low (°F)
1	81	54
2	80	54
3	80	53
4	80	53
5	80	53
6	79	52
7	79	52
8	78	51
9	78	51
10	78	51
11	77	50
12	77	50
13	76	49
14	76	49
15	76	49
16	75	48
17	75	48
18	75	47
19	74	47
20	74	47
21	74	46
22	73	46
23	73	46
24	73	45
25	72	45
26	72	44
27	72	44
28	71	44
29	71	43
30	70	43

	Clearer (%)	Cloudier (%)
1	74	26
2	74	26
3	74	26
4	74	26
5	74	26
6	74	26
7	74	26
8	74	26
9	74	26
10	75	25
11	74	26
12	75	25
13	75	25
14	75	25
15	75	25
16	75	25
17	75	25
18	75	25
19	76	24
20	75	25
21	75	25
22	75	25
23	75	25
24	75	25
25	74	26
26	74	26
27	74	26
28	74	26
29	74	26
30	74	26

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
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

	Avg high (°F)	Avg low (°F)
1	81	54
2	80	54
3	80	53
4	80	53
5	80	53
6	79	52
7	79	52
8	78	51
9	78	51
10	78	51
11	77	50
12	77	50
13	76	49
14	76	49
15	76	49
16	75	48
17	75	48
18	75	47
19	74	47
20	74	47
21	74	46
22	73	46
23	73	46
24	73	45
25	72	45
26	72	44
27	72	44
28	71	44
29	71	43
30	70	43

	Clearer (%)	Cloudier (%)
1	74	26
2	74	26
3	74	26
4	74	26
5	74	26
6	74	26
7	74	26
8	74	26
9	74	26
10	75	25
11	74	26
12	75	25
13	75	25
14	75	25
15	75	25
16	75	25
17	75	25
18	75	25
19	76	24
20	75	25
21	75	25
22	75	25
23	75	25
24	75	25
25	74	26
26	74	26
27	74	26
28	74	26
29	74	26
30	74	26

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

	Dry (%)	Comfortable (%)
1	99	1
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
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