Stillwater weather in May

In May, Stillwater sees average daytime highs of 79°F and overnight lows near 60°F, with 4.8 in of rain across 11.2 wet days and about 13.9 hours of daylight. It is the 5th-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 75°F in the first days to 83°F by the end. The sky is clear or mostly clear about 37% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 30 min at the start of May to 14 h 18 min by month's end. Set against the rest of the year, May is Stillwater's 12th-clearest and 3rd-windiest month. For the whole year in context, see Stillwater's year-round climate.

Daytime high
79°
5th warmest
Overnight low
60°
8th coldest
Rainfall
4.8 in
11.2 wet days
Daylight
13 h 54 min
5:27 AM – 7:22 PM
Cloud cover
54%
12th clearest
Wind
8 mph
3rd windiest
Solar energy
6 kWh/m²
Travel score
6.5
out of 10

Stillwater is city in Oklahoma, United States.

Density
630/km²
people per km²
Founded
1884

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 75°F in the first days to 83°F by the end.

A typical May day in Stillwater reaches about 79°F in the afternoon and slips back to 60°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 68°F and 88°F. Set against its neighbours, May runs about 8°F warmer than April and about 9°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
17455
27455
37555
47556
57556
67656
77657
87657
97758
107758
117758
127859
137859
147860
157960
167960
177961
188061
198061
208062
218162
228162
238163
248263
258264
268264
278264
288364
298365
308365
318465

How May really feels in Stillwater

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.

Stillwater 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
Jan48° / 30°1.55.31.39.82.1
Feb53° / 33°1.85.71.310.63.4
Mar62° / 42°2.98.10.711.75.6
Apr71° / 50°4.19012.96.8
May79° / 60°4.811.2013.96.5
Jun88° / 69°4.19.9014.44.6
Jul93° / 73°2.97.4014.23.5
Aug91° / 72°2.66.9013.43.9
Sep83° / 64°3.17.3012.26.3
Oct72° / 52°3.27.60.111.17.4
Nov60° / 41°2.05.70.410.15.5
Dec50° / 32°1.85.41.39.62.5

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 37% of the time in May, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 17% of May, with mostly cloudy or overcast conditions the remaining 46%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25248
35248
45248
55248
65248
75347
85347
95446
105347
115347
125446
135446
145446
155446
165446
175446
185446
195446
205446
215446
225347
235347
245446
255446
265446
275446
285545
295545
305545
315644

Chance of precipitation in May

Any precipitation

Stillwater gets around 4.8 in of rain over 11.2 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 36% and peaks near 37% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
436
536
636
737
837
937
1037
1137
1237
1337
1437
1536
1636
1736
1836
1936
2036
2136
2236
2336
2436
2536
2637
2737
2837
2937
3037
3137

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 35% of days. Sticky, muggy-or-worse air turns up on roughly 22% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
161181650
259181760
357181870
454191980
553192080
651192190
7481922100
8471923110
9451924120
10431925130
11421925130
12401926140
13391926150
14381927160
15371827170
16351828191
17341728201
18321728221
19311629231
20291629251
21281530261
22261530281
23241530291
24231530311
25211530332
26191530342
27181530362
28161530372
29151529393
30141529403
31121529414

Wind in May

Winds average 8 mph in May.

Across May, daily wind ranges from about 8 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
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light 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
318light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 30 min at the start of May to 14 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 48 minutes over May. Sunrise moves from 5:42 AM to 5:18 AM, and sunset from 7:09 PM to 7:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.55:427:09
213.55:417:10
313.55:407:11
413.55:397:12
513.65:387:12
613.65:367:13
713.65:357:14
813.75:347:15
913.75:337:16
1013.75:327:17
1113.85:327:18
1213.85:317:18
1313.85:307:19
1413.95:297:20
1513.95:287:21
1613.95:277:22
1713.95:267:23
1814.05:267:23
1914.05:257:24
2014.05:247:25
2114.05:247:26
2214.15:237:27
2314.15:227:27
2414.15:227:28
2514.15:217:29
2614.25:207:30
2714.25:207:30
2814.25:197:31
2914.25:197:32
3014.25:197:32
3114.35:187:33

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 6 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 6.84 kWh/m² in July across the year — May's 6 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.7Bright
25.7Bright
35.7Bright
45.8Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.9Bright
105.9Bright
115.9Bright
126.0Bright
136.0Intense
146.0Intense
156.0Intense
166.1Intense
176.1Intense
186.1Intense
196.1Intense
206.1Intense
216.2Intense
226.2Intense
236.2Intense
246.2Intense
256.2Intense
266.2Intense
276.2Intense
286.3Intense
296.3Intense
306.3Intense
316.3Intense
Planning a trip in May

Is May a good time to visit Stillwater?

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

6.5
Sightseeing
3rd-best month of the year
6.3
Beach & pool
5th-best month of the year

May is a reasonable time to visit Stillwater for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Stillwater in May

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

In May, Stillwater sees daytime highs around 79°F and nights near 60°F. Pack sun protection. Worth having: light clothes and rain gear. About 11 days see rain.

sun protectionlight clothesrain gear

UV index in Stillwater in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Stillwater peaks around July 12 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 21 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highHighModerateJul 12UV 10Dec 21UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5High
Apr9Very high
May8Very high
Jun10Very high
Jul10Very high
Aug10Very high
Sep7Very high
Oct5High
Nov4Moderate
Dec2Moderate

Air quality in Stillwater 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 Stillwater is worst in July — around 15 µg/m³ PM2.5 (moderate), about 3.3× the cleanest month (November, 5 µg/m³).

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

01020JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodModerateGoodJul 1815 µg/m³Nov 165 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar12Good
Apr13Moderate
May11Good
Jun12Moderate
Jul15Moderate
Aug13Moderate
Sep9Good
Oct5Good
Nov5Good
Dec5Good
Location & terrain

Where is Stillwater?

Stillwater sits at 36.1°N, 97.1°W, 896 ft above sea level, in United States. The nearest listed city is Edmond, 40 mi away.

Topography around Stillwater

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

Within 2 miles, the terrain around Stillwater has only modest variations in elevation — a maximum elevation change of 138 ft around an average of 902 ft above sea level; within 10 miles, only modest variations in elevation — a maximum elevation change of 341 ft; within 50 miles, only modest variations in elevation — a maximum elevation change of 719 ft.

The land around Stillwater is covered by trees (35%), artificial surfaces (33%) and grassland (24%) within 2 miles, grassland (50%) and trees (39%) within 10 miles, and grassland (47%) and trees (32%) within 50 miles.

2 miles
138 ft
10 miles
341 ft
50 miles
719 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Edmond 40 mi · Ponca City 41 mi · Enid 50 mi · Midwest City 50 mi · Del City 51 mi · Oklahoma City 52 mi · Bethany 52 mi · Sand Springs 53 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 Stillwater (36.1156°, -97.0584°, elevation 896 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).