Montgomery weather in May

In May, Montgomery sees average daytime highs of 70°F and overnight lows near 51°F, with 4.6 in of rain across 12.7 wet days and about 14.3 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 65°F in the first days to 74°F by the end. The sky is clear or mostly clear about 25% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 48 min at the start of May to 14 h 48 min by month's end. Set against the rest of the year, May is Montgomery's 6th-clearest and 8th-windiest month. For the whole year in context, see Montgomery's year-round climate.

Daytime high
70°
5th warmest
Overnight low
51°
8th coldest
Rainfall
4.6 in
12.7 wet days
Daylight
14 h 18 min
4:39 AM – 7:00 PM
Cloud cover
64%
6th clearest
Wind
8 mph
8th windiest
Solar energy
5.71 kWh/m²
Travel score
6.0
out of 10

Montgomery is village in Kane and Kendall counties, Illinois, USA.

Founded
1832

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 65°F in the first days to 74°F by the end.

A typical May day in Montgomery reaches about 70°F in the afternoon and slips back to 51°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 57°F and 83°F. Set against its neighbours, May runs about 10°F warmer than April and about 10°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16445
26546
36546
46547
56647
66647
76748
86748
96748
106849
116849
126849
136950
146950
156950
167050
177051
187051
197151
207152
217152
227253
237253
247253
257354
267354
277355
287455
297455
307456
317556

How May really feels in Montgomery

Once humidity and wind are folded in, May 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

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Montgomery weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan31° / 17°2.18.15.99.30.0
Feb35° / 20°2.074.610.30.0
Mar47° / 30°2.79.62.911.71.5
Apr59° / 40°4.411.80.913.14.3
May70° / 51°4.612.7014.36.0
Jun79° / 61°4.311.80156.3
Jul83° / 65°3.711.2014.75.9
Aug81° / 63°3.610.5013.76.5
Sep74° / 55°3.08.3012.37.1
Oct62° / 43°3.19.10.110.95.3
Nov47° / 33°2.58.21.29.61.7
Dec36° / 23°2.284.390.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 14% of May, with mostly cloudy or overcast conditions the remaining 61%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13664
23664
33664
43664
53565
63565
73664
83763
93763
103763
113862
123862
133961
144060
154060
164060
174060
184060
194060
204159
214159
224159
234258
244258
254159
264258
274258
284159
294159
304159
314357

Chance of precipitation in May

Any precipitation

Montgomery gets around 4.6 in of rain over 12.7 wet days in May, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 41% and peaks near 42% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
141
241
342
442
542
642
742
842
942
1042
1142
1241
1341
1441
1541
1641
1741
1841
1941
2040
2140
2240
2340
2440
2540
2640
2740
2840
2940
3040
3140

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 72% of days. Sticky, muggy-or-worse air turns up on roughly 5% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
1889210
2889210
38710210
48511310
58511310
68212420
78212420
88113420
97913530
107913530
117714630
127714630
137614640
147514740
157514740
167215850
177215850
187115950
197015960
2069151060
2168151070
2266151180
2364161280
2463161290
2562161390
26601713100
27591714100
28581814100
29571814110
30541915111
31531915121

Wind in May

Winds average 8 mph in May.

Across May, daily wind ranges from about 7 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
28light breeze
38light breeze
48light breeze
58light breeze
68light breeze
78light breeze
88light breeze
98light breeze
108light breeze
118light breeze
128light breeze
138light breeze
148light breeze
158light breeze
168light breeze
178light breeze
188light breeze
198light breeze
208light breeze
218light breeze
228light breeze
238light breeze
248light breeze
258light breeze
268light breeze
278light breeze
288light breeze
298light breeze
308light breeze
317light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 48 min at the start of May to 14 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 60 minutes over May. Sunrise moves from 4:57 AM to 4:28 AM, and sunset from 6:44 PM to 7:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.84:576:44
213.84:566:45
313.94:556:46
413.94:536:47
513.94:526:48
614.04:516:49
714.04:496:51
814.14:486:52
914.14:476:53
1014.14:466:54
1114.24:456:55
1214.24:436:56
1314.24:426:57
1414.34:416:58
1514.34:406:59
1614.34:397:00
1714.44:387:01
1814.44:377:02
1914.44:367:03
2014.54:357:04
2114.54:357:05
2214.54:347:06
2314.64:337:07
2414.64:327:08
2514.64:317:09
2614.64:317:10
2714.74:307:11
2814.74:297:11
2914.74:297:12
3014.74:287:13
3114.84:287:14

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.71 kWh/m².

For context, solar energy here swings from a low near 1.65 kWh/m² to a high of 6.3 kWh/m² in June across the year — May's 5.71 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.4Bright
45.4Bright
55.4Bright
65.4Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.6Bright
125.6Bright
135.7Bright
145.7Bright
155.7Bright
165.7Bright
175.8Bright
185.8Bright
195.8Bright
205.8Bright
215.9Bright
225.9Bright
235.9Bright
245.9Bright
255.9Bright
265.9Bright
276.0Bright
286.0Bright
296.0Bright
306.0Intense
316.0Intense
Planning a trip in May

Is May a good time to visit Montgomery?

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

6.0
Sightseeing
4th-best month of the year
3.6
Beach & pool
5th-best month of the year

May is a reasonable time to visit Montgomery for sightseeing.

What to pack for Montgomery in May

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

In May, Montgomery sees daytime highs around 70°F and nights near 51°F. Worth packing: rain gear and sun protection. About 13 days see rain.

rain gearsun protection

Sea temperature near Montgomery in May

The nearest coast averages about 45°F in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 39 mi away) is warmest in August at about 73°F and coldest in February near 36°F.

It's comfortable for a long swim from Jul 13 to Sep 15 — about 2.1 months when the water holds above 68°F.

30°40°50°60°70°80°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingwarmcomfortable to swim
Sea temperature (°F)Comfort
Jan38Bracing
Feb36Bracing
Mar36Bracing
Apr39Bracing
May45Bracing
Jun57Bracing
Jul70Refreshing
Aug73Refreshing
Sep68Refreshing
Oct58Bracing
Nov49Bracing
Dec42Bracing

UV index in Montgomery in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Montgomery peaks around June 20 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateLowJun 20UV 9Dec 19UV 2
UV index (midday)Level
Jan2Low
Feb3Moderate
Mar5Moderate
Apr6High
May7Very high
Jun9Very high
Jul8Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Moderate
Dec2Low

Air quality in Montgomery in May

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where May falls, not just the annual average.

Air quality in Montgomery is worst in July — around 17 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (October, 9 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodJul 1817 µg/m³Oct 229 µg/m³
PM2.5 (µg/m³)Level
Jan12Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May15Moderate
Jun16Moderate
Jul17Moderate
Aug16Moderate
Sep13Moderate
Oct9Good
Nov10Good
Dec11Good
Location & terrain

Where is Montgomery?

Montgomery sits at 41.7°N, 88.3°W, 640 ft above sea level, in United States. The nearest listed city is Aurora, 2.5 mi away.

Topography around Montgomery

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

Within 2 miles, the terrain around Montgomery has only modest variations in elevation — a maximum elevation change of 118 ft around an average of 659 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 367 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 784 ft.

The land around Montgomery is covered by artificial surfaces (34%), trees (33%) and grassland (22%) within 2 miles, cropland (35%), grassland (24%) and trees (22%) within 10 miles, and cropland (51%) within 50 miles.

2 miles
118 ft
10 miles
367 ft
50 miles
784 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Aurora 2.5 mi · Oswego 3.1 mi · North Aurora 5.6 mi · Yorkville 8.1 mi · Batavia 8.7 mi · Plainfield 9.9 mi · Naperville 11 mi · Geneva 11 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 Montgomery (41.7306°, -88.3459°, elevation 640 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).