Corvallis weather in May

In May, Corvallis sees average daytime highs of 66°F and overnight lows near 46°F, with 2.8 in of rain across 10.3 wet days and about 14.6 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 63°F in the first days to 68°F by the end. The sky is clear or mostly clear about 21% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 hours at the start of May to 15 h 06 min by month's end. Set against the rest of the year, May is Corvallis's 6th-clearest and 11th-windiest month. For the whole year in context, see Corvallis's year-round climate.

Daytime high
66°
5th warmest
Overnight low
46°
8th coldest
Rainfall
2.8 in
10.3 wet days
Daylight
14 h 36 min
4:51 AM – 7:27 PM
Cloud cover
64%
6th clearest
Wind
4 mph
11th windiest
Solar energy
5.65 kWh/m²
Travel score
5.9
out of 10

Corvallis is city in and county seat of Benton County, Oregon, United States.

Density
1,506/km²
people per km²
Founded
1845

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 63°F in the first days to 68°F by the end.

A typical May day in Corvallis reaches about 66°F in the afternoon and slips back to 46°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 78°F. Set against its neighbours, May runs about 7°F warmer than April and about 6°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16343
26343
36343
46444
56444
66444
76444
86444
96444
106545
116545
126545
136545
146546
156646
166646
176646
186646
196646
206747
216747
226747
236747
246747
256847
266848
276848
286848
296848
306948
316948

How May really feels in Corvallis

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.

Corvallis weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan47° / 36°6.916.91.791.3
Feb50° / 36°5.314.71.410.12.0
Mar55° / 38°6.016.80.911.62.8
Apr59° / 41°4.415.20.113.23.9
May66° / 46°2.810.3014.65.9
Jun72° / 50°1.46.3015.37.3
Jul81° / 55°0.31.80158.0
Aug82° / 55°0.42.2013.97.8
Sep76° / 51°1.44.6012.38.0
Oct64° / 44°3.810.7010.75.6
Nov52° / 39°6.816.50.29.42.3
Dec46° / 35°8.117.21.38.71.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 15% of May, with mostly cloudy or overcast conditions the remaining 63%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13763
23763
33763
43961
53961
63961
73862
83862
93862
103862
113664
123664
133664
143565
153565
163466
173466
183466
193367
203367
213565
223565
233565
243664
253862
263862
273862
283862
294060
304060
314060

Chance of precipitation in May

Any precipitation

Corvallis gets around 2.8 in of rain over 10.3 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 33% and peaks near 38% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
237
336
435
535
634
734
834
934
1034
1134
1234
1334
1434
1535
1635
1735
1835
1934
2034
2134
2233
2333
2432
2531
2631
2730
2829
2929
3029
3128

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 96% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19820
29820
39820
49820
59820
69820
79820
89730
99730
109730
119730
129730
139730
149730
159730
169640
179640
189640
199640
209640
219640
229640
239541
249541
259541
269541
279451
289451
299451
309451
319451

Wind in May

Winds average 4 mph in May.

Across May, daily wind ranges from about 4 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 hours at the start of May to 15 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over May. Sunrise moves from 5:11 AM to 4:38 AM, and sunset from 7:09 PM to 7:43 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:117:09
214.05:107:11
314.15:087:12
414.15:077:13
514.15:057:14
614.25:047:15
714.25:037:17
814.35:017:18
914.35:007:19
1014.44:597:20
1114.44:577:21
1214.44:567:23
1314.54:557:24
1414.54:547:25
1514.64:527:26
1614.64:517:27
1714.64:507:28
1814.74:497:30
1914.74:487:31
2014.74:477:32
2114.84:467:33
2214.84:457:34
2314.84:447:35
2414.94:437:36
2514.94:427:37
2614.94:427:38
2715.04:417:39
2815.04:407:40
2915.04:397:41
3015.14:397:42
3115.14:387:43

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.65 kWh/m².

For context, solar energy here swings from a low near 1.12 kWh/m² to a high of 7.2 kWh/m² in July across the year — May's 5.65 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.3Bright
25.3Bright
35.3Bright
45.4Bright
55.4Bright
65.5Bright
75.5Bright
85.5Bright
95.5Bright
105.5Bright
115.5Bright
125.6Bright
135.6Bright
145.6Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.7Bright
205.7Bright
215.7Bright
225.7Bright
235.7Bright
245.8Bright
255.8Bright
265.8Bright
275.8Bright
285.9Bright
295.9Bright
305.9Bright
315.9Bright
Planning a trip in May

Hazard calendar for Corvallis

In seasonPeak

None of Corvallis's seasonal hazards are active in May. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Corvallis's rainy season runs October–April, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is May a good time to visit Corvallis?

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

5.9
Sightseeing
5th-best month of the year
2.5
Beach & pool
5th-best month of the year

May is a reasonable time to visit Corvallis for sightseeing.

What to pack for Corvallis in May

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

In May, Corvallis sees daytime highs around 66°F and nights near 46°F. Worth packing: a warm layer, rain gear and sun protection. About 10 days see rain.

a warm layerrain gearsun protection

Sea temperature near Corvallis in May

The nearest coast averages about 54°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 43 mi away) is warmest in July at about 56°F and coldest in February near 50°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

48°50°52°54°56°58°JanFebMarAprMayJunJulAugSepOctNovDecbracing
Sea temperature (°F)Comfort
Jan50Bracing
Feb50Bracing
Mar50Bracing
Apr51Bracing
May54Bracing
Jun56Bracing
Jul56Bracing
Aug56Bracing
Sep56Bracing
Oct55Bracing
Nov53Bracing
Dec51Bracing

UV index in Corvallis 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 Corvallis peaks around July 16 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 18 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 16UV 8Dec 18UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5High
May8Very high
Jun7Very high
Jul8Very high
Aug7Very high
Sep5Moderate
Oct4Moderate
Nov1Low
Dec1Low

Air quality in Corvallis 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 Corvallis is worst in September — around 40 µg/m³ PM2.5 (poor), about 7.1× the cleanest month (January, 6 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodSep 1537 µg/m³Jan 186 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar10Good
Apr11Good
May11Good
Jun8Good
Jul8Good
Aug16Moderate
Sep40Poor
Oct11Good
Nov11Good
Dec9Good
Location & terrain

Where is Corvallis?

Corvallis sits at 44.6°N, 123.3°W, 233 ft above sea level, in United States. The nearest listed city is Albany, 9.3 mi away.

Topography around Corvallis

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

Within 2 miles, the terrain around Corvallis has only modest variations in elevation — a maximum elevation change of 262 ft around an average of 233 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,014 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,997 ft.

The land around Corvallis is covered by trees (42%) and artificial surfaces (26%) within 2 miles, trees (47%) and cropland (31%) within 10 miles, and trees (70%) within 50 miles.

2 miles
262 ft
10 miles
2,014 ft
50 miles
4,997 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Albany 9.3 mi · Lebanon 17 mi · Dallas 25 mi · Salem 29 mi · Four Corners 29 mi · Keizer 32 mi · Hayesville 32 mi · Eugene 37 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 Corvallis (44.5646°, -123.262°, elevation 233 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).