Golden weather in September

In September, Golden sees average daytime highs of 70°F and overnight lows near 44°F, with 2.2 in of precipitation across 10.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 74°F in the first days to 66°F by the end. The sky is clear or mostly clear about 47% 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 Golden's 4th-clearest and 10th-windiest month. For the whole year in context, see Golden's year-round climate.

Daytime high: 70°; 4th warmest
Overnight low: 44°; 9th coldest
Precipitation: 2.2 in; 10.6 wet days
Daylight: 12 h 18 min; 5:47 AM – 6:03 PM
Cloud cover: 44%; 4th clearest
Wind: 5 mph; 10th windiest
Solar energy: 5.52 kWh/m²
Travel score: 6.6; out of 10

Golden is city in and county seat of Jefferson County, Colorado, United States.

Density: 783/km²; people per km²
Founded: 1859

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

← August Golden 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 74°F in the first days to 66°F by the end.

A typical September day in Golden reaches about 70°F in the afternoon and slips back to 44°F overnight — a 26°F spread between the day's warmth and the night's chill. On most days the high lands between 58°F and 80°F. Set against its neighbours, September runs about 7°F cooler than August and about 12°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)	75	75	74	74	74	73	73	73	72	72	72	71	71	71	70	70	69	69	69	69	68	68	67	67	67	67	66	66	65	65
Avg low (°F)	49	48	48	48	47	47	47	46	46	46	45	45	44	44	44	43	43	42	42	42	41	41	41	40	40	40	39	39	39	38

	Avg high (°F)	Avg low (°F)
1	75	49
2	75	48
3	74	48
4	74	48
5	74	47
6	73	47
7	73	47
8	73	46
9	72	46
10	72	46
11	72	45
12	71	45
13	71	44
14	71	44
15	70	44
16	70	43
17	69	43
18	69	42
19	69	42
20	69	42
21	68	41
22	68	41
23	67	41
24	67	40
25	67	40
26	67	40
27	66	39
28	66	39
29	65	39
30	65	38

How September really feels in Golden

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.

Golden weather by month

How September compares with the rest of the year at a glance. September is the 4th-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	37° / 15°	1.0	5.7	6	9.5	0.0
Feb	39° / 16°	1.1	6.6	6.7	10.4	0.0
Mar	47° / 22°	2.1	9.1	7.8	11.7	1.6
Apr	53° / 28°	3.2	11.6	8.2	13	2.8
May	62° / 37°	4.1	15.3	4.1	14.2	4.6
Jun	73° / 46°	3.3	14.9	0.4	14.8	6.0
Jul	79° / 52°	3.4	15.9	0	14.5	5.9
Aug	77° / 51°	3.3	17	0	13.6	6.0
Sep	70° / 44°	2.2	10.6	1	12.3	6.6
Oct	58° / 32°	1.9	7.7	4	10.9	4.8
Nov	46° / 22°	1.3	6.8	6.1	9.8	1.3
Dec	37° / 15°	0.9	5.3	5.7	9.2	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 47% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 29%. 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 (%)	68	68	68	68	68	69	69	69	69	70	70	70	71	71	70	71	71	72	72	73	73	73	73	72	72	72	71	71	71	71
Cloudier (%)	32	32	32	32	32	31	31	31	31	30	30	30	29	29	30	29	29	28	28	27	27	27	27	28	28	28	29	29	29	29

	Clearer (%)	Cloudier (%)
1	68	32
2	68	32
3	68	32
4	68	32
5	68	32
6	69	31
7	69	31
8	69	31
9	69	31
10	70	30
11	70	30
12	70	30
13	71	29
14	71	29
15	70	30
16	71	29
17	71	29
18	72	28
19	72	28
20	73	27
21	73	27
22	73	27
23	73	27
24	72	28
25	72	28
26	72	28
27	71	29
28	71	29
29	71	29
30	71	29

Chance of precipitation in September

Any precipitationSnow

Golden gets around 2.2 in of rain and snow over 10.6 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 37% and peaks near 45% on the wettest days, and about 1 day brings snow. 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 (%)	45	45	44	44	43	43	42	42	41	41	40	40	39	38	38	37	36	35	34	33	32	31	30	30	30	30	29	29	29	29
Snow chance (%)	0	1	1	1	1	1	2	2	2	2	2	3	3	3	4	4	4	4	5	5	5	5	5	5	6	6	6	6	7	7

	Rain chance (%)	Snow chance (%)
1	45	0
2	45	1
3	44	1
4	44	1
5	43	1
6	43	1
7	42	2
8	42	2
9	41	2
10	41	2
11	40	2
12	40	3
13	39	3
14	38	3
15	38	4
16	37	4
17	36	4
18	35	4
19	34	5
20	33	5
21	32	5
22	31	5
23	30	5
24	30	5
25	30	6
26	30	6
27	29	6
28	29	6
29	29	7
30	29	7

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 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
Dry (%)	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	100	100	100	100	100

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

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 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 5:33 AM to 6:01 AM, and sunset from 6:28 PM to 5:39 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)	5:33	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	5:47	5:48	5:49	5:50	5:51	5:52	5:53	5:54	5:55	5:56	5:57	5:58	5:59	6:00	6:01
Sunset (PM)	6:28	6:26	6:25	6:23	6:22	6:20	6:18	6:17	6:15	6:13	6:11	6:10	6:08	6:06	6:05	6:03	6:01	5:59	5:58	5:56	5:54	5:53	5:51	5:49	5:48	5:46	5:44	5:42	5:41	5:39

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.9	5:33	6:28
2	12.9	5:34	6:26
3	12.8	5:35	6:25
4	12.8	5:36	6:23
5	12.7	5:37	6:22
6	12.7	5:38	6:20
7	12.7	5:39	6:18
8	12.6	5:40	6:17
9	12.6	5:41	6:15
10	12.5	5:42	6:13
11	12.5	5:43	6:11
12	12.4	5:44	6:10
13	12.4	5:45	6:08
14	12.3	5:46	6:06
15	12.3	5:47	6:05
16	12.3	5:47	6:03
17	12.2	5:48	6:01
18	12.2	5:49	5:59
19	12.1	5:50	5:58
20	12.1	5:51	5:56
21	12.0	5:52	5:54
22	12.0	5:53	5:53
23	11.9	5:54	5:51
24	11.9	5:55	5:49
25	11.9	5:56	5:48
26	11.8	5:57	5:46
27	11.8	5:58	5:44
28	11.7	5:59	5:42
29	11.7	6:00	5:41
30	11.6	6:01	5:39

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.52 kWh/m².

For context, solar energy here swings from a low near 2.62 kWh/m² to a high of 7.51 kWh/m² in June across the year — September's 5.52 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)	6.0	6.0	6.0	5.9	5.9	5.8	5.8	5.8	5.7	5.7	5.7	5.6	5.6	5.5	5.5	5.5	5.4	5.4	5.4	5.3	5.3	5.3	5.2	5.2	5.1	5.1	5.0	5.0	4.9	4.9
Level	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	Bright	Bright

	Solar energy (kWh/m²)	Level
1	6.0	Intense
2	6.0	Bright
3	6.0	Bright
4	5.9	Bright
5	5.9	Bright
6	5.8	Bright
7	5.8	Bright
8	5.8	Bright
9	5.7	Bright
10	5.7	Bright
11	5.7	Bright
12	5.6	Bright
13	5.6	Bright
14	5.5	Bright
15	5.5	Bright
16	5.5	Bright
17	5.4	Bright
18	5.4	Bright
19	5.4	Bright
20	5.3	Bright
21	5.3	Bright
22	5.3	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

Hazard calendar for Golden

In seasonPeak

In September, Golden sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Golden's rainy season runs March–October, 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 Golden?

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

6.6

Sightseeing

1st-best month of the year

4.0

Beach & pool

4th-best month of the year

September is a reasonable time to visit Golden for sightseeing.

What to pack for Golden in September

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

In September, Golden sees daytime highs around 70°F and nights near 44°F. Worth packing: a warm layer, rain gear and sun protection. About 11 days see rain.

a warm layerrain gearsun protection

UV index in Golden in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Golden peaks around July 14 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 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	7	8	11	11	10	8	6	4	2
Level	Moderate	Moderate	High	High	Very high	Extreme	Extreme	Extreme	Very high	High	Moderate	Moderate

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

Air quality in Golden 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 Golden 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 Golden?

Golden sits at 39.8°N, 105.2°W, 5,676 ft above sea level, in United States. The nearest listed city is Wheat Ridge, 7.5 mi away.

Topography around Golden

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

Within 2 miles, the terrain around Golden has significant variations in elevation — a maximum elevation change of 1,864 ft around an average of 6,106 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,738 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,498 ft.

The land around Golden is covered by grassland (58%), trees (21%) and artificial surfaces (21%) within 2 miles, grassland (40%) and trees (38%) within 10 miles, and trees (40%) and grassland (39%) within 50 miles.

2 miles

1,864 ft

grassland 58%

10 miles

4,738 ft

grassland 40%

50 miles

9,498 ft

trees 40%

treesgrasslandcroplandartificial surfacesbare terrainwatermoss and lichen

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

September weather nearby: Wheat Ridge 7.5 mi · Arvada 8.1 mi · Lakewood 8.1 mi · Dakota Ridge 11 mi · Westminster 11 mi · Denver 12 mi · Sherrelwood 13 mi · Broomfield 14 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 Golden (39.7555°, -105.2211°, elevation 5,676 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	75	49
2	75	48
3	74	48
4	74	48
5	74	47
6	73	47
7	73	47
8	73	46
9	72	46
10	72	46
11	72	45
12	71	45
13	71	44
14	71	44
15	70	44
16	70	43
17	69	43
18	69	42
19	69	42
20	69	42
21	68	41
22	68	41
23	67	41
24	67	40
25	67	40
26	67	40
27	66	39
28	66	39
29	65	39
30	65	38

	Clearer (%)	Cloudier (%)
1	68	32
2	68	32
3	68	32
4	68	32
5	68	32
6	69	31
7	69	31
8	69	31
9	69	31
10	70	30
11	70	30
12	70	30
13	71	29
14	71	29
15	70	30
16	71	29
17	71	29
18	72	28
19	72	28
20	73	27
21	73	27
22	73	27
23	73	27
24	72	28
25	72	28
26	72	28
27	71	29
28	71	29
29	71	29
30	71	29

	Rain chance (%)	Snow chance (%)
1	45	0
2	45	1
3	44	1
4	44	1
5	43	1
6	43	1
7	42	2
8	42	2
9	41	2
10	41	2
11	40	2
12	40	3
13	39	3
14	38	3
15	38	4
16	37	4
17	36	4
18	35	4
19	34	5
20	33	5
21	32	5
22	31	5
23	30	5
24	30	5
25	30	6
26	30	6
27	29	6
28	29	6
29	29	7
30	29	7

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

	Avg high (°F)	Avg low (°F)
1	75	49
2	75	48
3	74	48
4	74	48
5	74	47
6	73	47
7	73	47
8	73	46
9	72	46
10	72	46
11	72	45
12	71	45
13	71	44
14	71	44
15	70	44
16	70	43
17	69	43
18	69	42
19	69	42
20	69	42
21	68	41
22	68	41
23	67	41
24	67	40
25	67	40
26	67	40
27	66	39
28	66	39
29	65	39
30	65	38

	Clearer (%)	Cloudier (%)
1	68	32
2	68	32
3	68	32
4	68	32
5	68	32
6	69	31
7	69	31
8	69	31
9	69	31
10	70	30
11	70	30
12	70	30
13	71	29
14	71	29
15	70	30
16	71	29
17	71	29
18	72	28
19	72	28
20	73	27
21	73	27
22	73	27
23	73	27
24	72	28
25	72	28
26	72	28
27	71	29
28	71	29
29	71	29
30	71	29

	Rain chance (%)	Snow chance (%)
1	45	0
2	45	1
3	44	1
4	44	1
5	43	1
6	43	1
7	42	2
8	42	2
9	41	2
10	41	2
11	40	2
12	40	3
13	39	3
14	38	3
15	38	4
16	37	4
17	36	4
18	35	4
19	34	5
20	33	5
21	32	5
22	31	5
23	30	5
24	30	5
25	30	6
26	30	6
27	29	6
28	29	6
29	29	7
30	29	7

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

	Avg high (°F)	Avg low (°F)
1	75	49
2	75	48
3	74	48
4	74	48
5	74	47
6	73	47
7	73	47
8	73	46
9	72	46
10	72	46
11	72	45
12	71	45
13	71	44
14	71	44
15	70	44
16	70	43
17	69	43
18	69	42
19	69	42
20	69	42
21	68	41
22	68	41
23	67	41
24	67	40
25	67	40
26	67	40
27	66	39
28	66	39
29	65	39
30	65	38

	Clearer (%)	Cloudier (%)
1	68	32
2	68	32
3	68	32
4	68	32
5	68	32
6	69	31
7	69	31
8	69	31
9	69	31
10	70	30
11	70	30
12	70	30
13	71	29
14	71	29
15	70	30
16	71	29
17	71	29
18	72	28
19	72	28
20	73	27
21	73	27
22	73	27
23	73	27
24	72	28
25	72	28
26	72	28
27	71	29
28	71	29
29	71	29
30	71	29

	Rain chance (%)	Snow chance (%)
1	45	0
2	45	1
3	44	1
4	44	1
5	43	1
6	43	1
7	42	2
8	42	2
9	41	2
10	41	2
11	40	2
12	40	3
13	39	3
14	38	3
15	38	4
16	37	4
17	36	4
18	35	4
19	34	5
20	33	5
21	32	5
22	31	5
23	30	5
24	30	5
25	30	6
26	30	6
27	29	6
28	29	6
29	29	7
30	29	7

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