Eagle weather in September

In September, Eagle sees average daytime highs of 77°F and overnight lows near 49°F, with 0.6 in of rain across 2.6 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 82°F in the first days to 72°F by the end. The sky is clear or mostly clear about 66% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 06 min at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Eagle's 3rd-clearest and 9th-windiest month. For the whole year in context, see Eagle's year-round climate.

Daytime high
77°
4th warmest
Overnight low
49°
9th coldest
Rainfall
0.6 in
2.6 wet days
Daylight
12 h 18 min
6:31 AM – 6:49 PM
Cloud cover
30%
3rd clearest
Wind
5 mph
9th windiest
Solar energy
5.43 kWh/m²
Travel score
8.4
out of 10

Eagle is city in Ada County, Idaho, United States.

Density
310/km²
people per km²

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 72°F by the end.

A typical September day in Eagle reaches about 77°F in the afternoon and slips back to 49°F overnight — a 28°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 88°F. Set against its neighbours, September runs about 10°F cooler than August and about 15°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18354
28353
38253
48253
58253
68152
78152
88051
98051
107951
117951
127850
137850
147850
157749
167749
177649
187648
197648
207548
217547
227447
237447
247447
257346
267346
277346
287245
297245
307145

How September really feels in Eagle

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.

Eagle weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan37° / 23°2.410.76.69.10.0
Feb43° / 27°1.79.24.310.20.6
Mar52° / 32°2.010.62.511.62.8
Apr60° / 37°1.78.60.513.24.9
May69° / 44°1.67.50.114.56.9
Jun78° / 51°0.83.9015.27.9
Jul89° / 58°0.21.2014.95.6
Aug87° / 57°0.21.5013.86.0
Sep77° / 49°0.62.6012.38.4
Oct62° / 39°1.250.110.86.2
Nov47° / 30°1.99.639.51.5
Dec37° / 23°2.711.26.98.80.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 66% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 13% of September, with mostly cloudy or overcast conditions the remaining 21%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
18515
28515
38515
48416
58416
68317
78317
88218
98119
108020
118020
127822
137822
147822
157624
167624
177624
187624
197624
207624
217624
227624
237723
247723
257723
267723
277723
287723
297723
307723

Chance of precipitation in September

Any precipitation

Eagle gets around 0.6 in of rain over 2.6 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 9% and peaks near 10% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
16
27
37
47
57
67
78
88
98
108
119
129
139
149
159
169
179
189
199
209
219
229
239
249
259
269
2710
2810
2910
3010

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.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1991
2982
3982
4982
5982
6982
7982
8982
9982
10982
11982
12982
13991
14991
15991
16991
17991
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000

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.

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
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 06 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 90 minutes over September. Sunrise moves from 6:13 AM to 6:47 AM, and sunset from 7:17 PM to 6:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.16:137:17
213.06:157:15
313.06:167:13
412.96:177:11
512.96:187:09
612.86:197:08
712.86:207:06
812.76:227:04
912.76:237:02
1012.66:247:00
1112.66:256:58
1212.56:266:56
1312.46:276:54
1412.46:296:52
1512.36:306:51
1612.36:316:49
1712.26:326:47
1812.26:336:45
1912.16:346:43
2012.16:366:41
2112.06:376:39
2212.06:386:37
2311.96:396:35
2411.96:406:33
2511.86:416:31
2611.86:436:30
2711.76:446:28
2811.76:456:26
2911.66:466:24
3011.66:476:22

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.43 kWh/m².

For context, solar energy here swings from a low near 1.63 kWh/m² to a high of 8.03 kWh/m² in July across the year — September's 5.43 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.3Intense
26.3Intense
36.2Intense
46.1Intense
56.1Intense
66.0Intense
76.0Bright
85.9Bright
95.8Bright
105.8Bright
115.7Bright
125.6Bright
135.6Bright
145.5Bright
155.4Bright
165.4Bright
175.3Bright
185.3Bright
195.2Bright
205.1Bright
215.1Bright
225.0Bright
235.0Bright
244.9Bright
254.8Bright
264.8Bright
274.7Bright
284.7Bright
294.6Bright
304.5Bright
Planning a trip in September

Is September a good time to visit Eagle?

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

8.4
Sightseeing
1st-best month of the year
7.4
Beach & pool
3rd-best month of the year

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

What to pack for Eagle in September

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

In September, Eagle sees daytime highs around 77°F and nights near 49°F. Worth packing: light clothes and sun protection.

light clothessun protection

UV index in Eagle in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Eagle peaks around July 13 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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 13UV 9Dec 14UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May8Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct4Moderate
Nov2Low
Dec1Low

Air quality in Eagle 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 Eagle is worst in August — around 45 µg/m³ PM2.5 (poor), about 6.0× the cleanest month (December, 7 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodAug 1742 µg/m³Dec 208 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar10Good
Apr10Good
May10Good
Jun8Good
Jul20Moderate
Aug45Poor
Sep21Moderate
Oct15Moderate
Nov9Good
Dec7Good
Location & terrain

Where is Eagle?

Eagle sits at 43.7°N, 116.4°W, 2,566 ft above sea level, in United States. The nearest listed city is Meridian, 6.2 mi away.

Topography around Eagle

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

Within 2 miles, the terrain around Eagle has only modest variations in elevation — a maximum elevation change of 171 ft around an average of 2,585 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,274 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 7,116 ft.

The land around Eagle is covered by trees (42%), grassland (24%) and artificial surfaces (22%) within 2 miles, grassland (54%) within 10 miles, and grassland (64%) within 50 miles.

2 miles
171 ft
10 miles
3,274 ft
50 miles
7,116 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Meridian 6.2 mi · Boise 9.3 mi · Kuna 14 mi · Nampa 15 mi · Caldwell 17 mi · Twin Falls 124 mi · Pendleton 181 mi · Lewiston Orchards 188 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 Eagle (43.6954°, -116.354°, elevation 2,566 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).