Forest Hills weather in September

In September, Forest Hills sees average daytime highs of 72°F and overnight lows near 53°F, with 3.1 in of rain across 9.5 wet days and about 12.3 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 76°F in the first days to 67°F by the end. The sky is clear or mostly clear about 36% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 hours at the start of September to 11 h 36 min by month's end. Set against the rest of the year, September is Forest Hills's 1st-clearest and 9th-windiest month. For the whole year in context, see Forest Hills's year-round climate.

Daytime high
72°
4th warmest
Overnight low
53°
9th coldest
Rainfall
3.1 in
9.5 wet days
Daylight
12 h 18 min
6:28 AM – 6:45 PM
Cloud cover
54%
1st clearest
Wind
7 mph
9th windiest
Solar energy
4.25 kWh/m²
Travel score
6.8
out of 10

Forest Hills is unincorporated community in Kent County, Michigan, United States.

Density
197/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 76°F in the first days to 67°F by the end.

A typical September day in Forest Hills reaches about 72°F in the afternoon and slips back to 53°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 61°F and 82°F. Set against its neighbours, September runs about 7°F cooler than August and about 13°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
17758
27758
37657
47657
57657
67656
77556
87556
97455
107455
117455
127455
137354
147354
157353
167253
177253
187152
197152
207151
217051
227051
236950
246950
256849
266849
276749
286748
296748
306647

How September really feels in Forest Hills

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.

Forest Hills weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan30° / 18°2.410.19.59.20.0
Feb33° / 18°2.07.86.410.20.0
Mar44° / 27°2.59.34.111.60.9
Apr57° / 38°4.0121.913.13.8
May68° / 49°4.211.9014.46.0
Jun78° / 59°3.911.5015.16.5
Jul81° / 63°3.611.1014.86.4
Aug79° / 61°3.610.6013.86.7
Sep72° / 53°3.19.5012.36.8
Oct59° / 42°3.310.90.310.84.5
Nov46° / 33°2.69.72.59.51.2
Dec35° / 24°2.310.27.88.90.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of September, with mostly cloudy or overcast conditions the remaining 47%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
15743
25743
35743
45743
55743
65743
75644
85644
95644
105545
115446
125446
135347
145347
155248
165248
175149
185149
195149
205149
215149
225149
234951
244951
254951
264951
274951
284951
294951
304951

Chance of precipitation in September

Any precipitation

Forest Hills gets around 3.1 in of rain over 9.5 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 32% and peaks near 37% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202530
Rain chance (%)
131
231
330
430
530
630
730
830
930
1030
1130
1230
1330
1430
1530
1630
1731
1831
1931
2032
2133
2233
2334
2435
2536
2636
2737
2837
2937
3037

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 58% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1332820153
2352819153
3372819143
4392718133
5412718122
6432717112
7442617112
8462617102
948261691
1049251691
1151241681
1252241581
1353231581
1454231571
1557221470
1657221470
1760211360
1862201260
1963201160
2065191150
2167181050
226917950
237117840
247316740
257415740
267615630
277714630
287913530
297913530
308112520

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 8 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287light breeze
298light breeze
308light breeze

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 hours 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 84 minutes over September. Sunrise moves from 6:11 AM to 6:44 AM, and sunset from 7:12 PM to 6:19 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.06:117:12
213.06:127:11
312.96:137:09
412.96:147:07
512.86:157:05
612.86:167:03
712.76:187:02
812.76:197:00
912.66:206:58
1012.66:216:56
1112.56:226:54
1212.56:236:52
1312.46:246:51
1412.46:256:49
1512.36:276:47
1612.36:286:45
1712.26:296:43
1812.26:306:41
1912.16:316:39
2012.16:326:37
2112.06:336:36
2212.06:346:34
2311.96:366:32
2411.96:376:30
2511.86:386:28
2611.86:396:26
2711.76:406:24
2811.76:416:23
2911.66:426:21
3011.66:446:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.25 kWh/m².

For context, solar energy here swings from a low near 1.31 kWh/m² to a high of 6.35 kWh/m² in June across the year — September's 4.25 kWh/m² falls in the middle.

024151015202530
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.7Bright
54.7Bright
64.7Bright
74.6Bright
84.6Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.8Moderate
263.8Moderate
273.7Moderate
283.7Moderate
293.6Moderate
303.6Moderate
Planning a trip in September

Is September a good time to visit Forest Hills?

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

6.8
Sightseeing
1st-best month of the year
4.8
Beach & pool
4th-best month of the year

September is a reasonable time to visit Forest Hills for sightseeing.

What to pack for Forest Hills in September

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

In September, Forest Hills sees daytime highs around 72°F and nights near 53°F. Worth packing: light clothes and rain gear. About 10 days see rain.

light clothesrain gear

UV index in Forest Hills 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 Forest Hills peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 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 highHighModerateLowJun 20UV 9Dec 21UV 1
UV index (midday)Level
Jan2Low
Feb2Moderate
Mar4Moderate
Apr5High
May7Very high
Jun9Very high
Jul9Very high
Aug7Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec1Low
Location & terrain

Where is Forest Hills?

Forest Hills sits at 43.0°N, 85.5°W, 630 ft above sea level, in United States. The nearest listed city is Grand Rapids, 9.3 mi away.

Topography around Forest Hills

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

Within 2 miles, the terrain around Forest Hills has only modest variations in elevation — a maximum elevation change of 279 ft around an average of 725 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 433 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 810 ft.

The land around Forest Hills is covered by trees (75%) within 2 miles, trees (58%) within 10 miles, and trees (48%) and cropland (29%) within 50 miles.

2 miles
279 ft
10 miles
433 ft
50 miles
810 ft
treesgrasslandcroplandartificial surfaceswater
September weather nearby: Grand Rapids 9.3 mi · Kentwood 9.9 mi · Wyoming 11 mi · Grandville 14 mi · Walker 14 mi · Jenison 16 mi · Allendale 24 mi · Holland 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 Forest Hills (42.9595°, -85.4898°, elevation 630 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).