Evans weather in September

In September, Evans sees average daytime highs of 78°F and overnight lows near 50°F, with 1.1 in of precipitation across 4.6 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 83°F in the first days to 72°F by the end. The sky is clear or mostly clear about 55% 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 Evans's 1st-clearest and 7th-windiest month. For the whole year in context, see Evans's year-round climate.

Daytime high
78°
4th warmest
Overnight low
50°
9th coldest
Precipitation
1.1 in
4.6 wet days
Daylight
12 h 18 min
5:45 AM – 6:01 PM
Cloud cover
40%
1st clearest
Wind
5 mph
7th windiest
Solar energy
5.34 kWh/m²
Travel score
7.7
out of 10

Evans is home rule municipality in Weld County, Colorado.

Density
783/km²
people per km²
Founded
1867

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 83°F in the first days to 72°F by the end.

A typical September day in Evans reaches about 78°F in the afternoon and slips back to 50°F overnight — a 27°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 89°F. Set against its neighbours, September runs about 8°F cooler than August and about 14°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18456
28356
38355
48355
58255
68254
78154
88154
98053
108053
118052
127952
137951
147851
157851
167750
177750
187749
197649
207648
217548
227548
237447
247447
257446
267346
277346
287345
297245
307144

How September really feels in Evans

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.

Evans 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.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan41° / 19°0.42.93.39.40.2
Feb45° / 21°0.43.43.410.41.2
Mar55° / 29°1.15.43.211.74.0
Apr62° / 36°1.98.52.7135.5
May71° / 45°2.69.80.614.26.6
Jun82° / 55°1.67.3014.86.4
Jul88° / 61°1.47.5014.64.7
Aug86° / 59°1.26.6013.65.5
Sep78° / 50°1.14.60.312.37.7
Oct64° / 38°1.25.11.410.96.5
Nov51° / 27°0.63.82.99.82.9
Dec41° / 20°0.42.939.20.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 27%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
17426
27426
37426
47426
57426
67426
77525
87525
97525
107525
117525
127525
137426
147426
157426
167327
177327
187327
197327
207327
217228
227228
237129
247228
257129
267030
277030
286931
297030
307030

Chance of precipitation in September

Any precipitationSnow

Evans gets around 1.1 in of rain and snow over 4.6 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 16% and peaks near 17% on the wettest days, and about 0 day brings snow.

0%10%20%30%151015202530
Rain chance (%)Snow chance (%)
1140
2140
3150
4150
5151
6151
7161
8161
9161
10171
11171
12171
13171
14171
15171
16171
17171
18171
19171
20161
21161
22161
23161
24161
25161
26161
27161
28161
29171
30172

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
19280
29280
39271
49361
59451
69451
79541
89541
99631
109631
119721
129721
139721
149811
159811
169910
179910
189910
199910
2010000
2110000
2210000
2310000
2410000
2510000
2610000
2710000
2810000
2910000
3010000

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.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:30 AM to 5:59 AM, and sunset from 6:27 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.95:306:27
212.95:316:25
312.85:326:23
412.85:336:22
512.85:346:20
612.75:356:18
712.75:366:17
812.65:376:15
912.65:386:13
1012.55:396:11
1112.55:406:10
1212.45:416:08
1312.45:426:06
1412.45:436:04
1512.35:446:03
1612.35:456:01
1712.25:465:59
1812.25:475:57
1912.15:485:56
2012.15:495:54
2112.05:505:52
2212.05:515:51
2311.95:525:49
2411.95:535:47
2511.95:545:45
2611.85:555:44
2711.85:565:42
2811.75:575:40
2911.75:585:38
3011.65:595:37

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.34 kWh/m².

For context, solar energy here swings from a low near 2.34 kWh/m² to a high of 7.29 kWh/m² in June across the year — September's 5.34 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.0Intense
26.0Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.7Bright
85.7Bright
95.6Bright
105.6Bright
115.5Bright
125.5Bright
135.4Bright
145.4Bright
155.3Bright
165.3Bright
175.3Bright
185.2Bright
195.2Bright
205.1Bright
215.1Bright
225.0Bright
235.0Bright
244.9Bright
254.9Bright
264.8Bright
274.8Bright
284.7Bright
294.7Bright
304.6Bright
Planning a trip in September

Is September a good time to visit Evans?

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
7.0
Beach & pool
4th-best month of the year

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

What to pack for Evans in September

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

In September, Evans sees daytime highs around 78°F and nights near 50°F. Worth packing: light clothes and sun protection. About 5 days see rain.

light clothessun protection

UV index in Evans 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 Evans 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 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 13UV 11Dec 23UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar6High
Apr6High
May7Very high
Jun10Extreme
Jul11Extreme
Aug9Very high
Sep7High
Oct5Moderate
Nov3Moderate
Dec2Low

Air quality in Evans 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 Evans is worst in October — around 30 µg/m³ PM2.5 (moderate), about 3.1× the cleanest month (November, 10 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodOct 1528 µg/m³Nov 2310 µg/m³
PM2.5 (µg/m³)Level
Jan12Good
Feb12Moderate
Mar14Moderate
Apr11Good
May11Good
Jun12Good
Jul14Moderate
Aug19Moderate
Sep17Moderate
Oct30Moderate
Nov10Good
Dec11Good
Location & terrain

Where is Evans?

Evans sits at 40.4°N, 104.7°W, 4,652 ft above sea level, in United States. The nearest listed city is Greeley, 3.1 mi away.

Topography around Evans

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

Within 2 miles, the terrain around Evans has only modest variations in elevation — a maximum elevation change of 213 ft around an average of 4,685 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 495 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,869 ft.

The land around Evans is covered by artificial surfaces (35%) and grassland (30%) within 2 miles, cropland (51%) and grassland (35%) within 10 miles, and grassland (60%) and cropland (21%) within 50 miles.

2 miles
213 ft
10 miles
495 ft
50 miles
9,869 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Greeley 3.1 mi · Windsor 13 mi · Loveland 21 mi · Fort Collins 25 mi · Longmont 26 mi · Brighton 28 mi · Erie 29 mi · Lafayette 34 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 Evans (40.3764°, -104.6922°, elevation 4,652 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).