Bethany weather in May

In May, Bethany sees average daytime highs of 67°F and overnight lows near 48°F, with 2.8 in of rain across 11.1 wet days and about 14.7 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 64°F in the first days to 69°F by the end. The sky is clear or mostly clear about 19% 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 12 min by month's end. Set against the rest of the year, May is Bethany's 6th-clearest and 10th-windiest month. For the whole year in context, see Bethany's year-round climate.

Daytime high
67°
5th warmest
Overnight low
48°
8th coldest
Rainfall
2.8 in
11.1 wet days
Daylight
14 h 42 min
4:47 AM – 7:29 PM
Cloud cover
66%
6th clearest
Wind
4 mph
10th windiest
Solar energy
5.51 kWh/m²
Travel score
5.9
out of 10

Bethany is unincorporated community in Washington County, Oregon, United States.

Density
1,550/km²
people per km²

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 64°F in the first days to 69°F by the end.

A typical May day in Bethany reaches about 67°F in the afternoon and slips back to 48°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 80°F. Set against its neighbours, May runs about 7°F warmer than April and about 5°F cooler than June.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16445
26445
36445
46445
56546
66546
76546
86546
96546
106646
116647
126647
136647
146647
156747
166748
176748
186748
196748
206749
216849
226849
236849
246849
256849
266949
276950
286950
296950
306950
316950

How May really feels in Bethany

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.

Bethany 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°6.617.31.88.91.2
Feb50° / 37°5.014.81.510.12.0
Mar55° / 39°5.717.50.711.62.8
Apr60° / 42°4.516.1013.24.0
May67° / 48°2.811.1014.75.9
Jun72° / 52°1.77.6015.47.0
Jul80° / 56°0.52.3015.18.0
Aug81° / 56°0.62.6013.97.9
Sep75° / 52°1.66.2012.37.7
Oct63° / 46°4.211.9010.75.2
Nov52° / 40°6.917.30.49.32.2
Dec46° / 36°7.6182.28.60.9

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 19% 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 66%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13565
23565
33565
43565
53565
63565
73565
83565
93565
103565
113466
123466
133466
143367
153466
163268
173268
183268
193268
203268
213268
223367
233367
243367
253466
263367
273466
283565
293565
303565
313565

Chance of precipitation in May

Any precipitation

Bethany gets around 2.8 in of rain over 11.1 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 36% and peaks near 44% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
144
243
342
441
540
639
738
838
937
1037
1136
1236
1336
1436
1536
1636
1736
1836
1936
2036
2135
2235
2335
2434
2534
2633
2733
2832
2932
3032
3132

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 95% 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
79730
89730
99730
109730
119730
129640
139640
149640
159640
169550
179550
189550
199460
209460
219460
229460
239361
249361
259361
269361
279361
289361
299361
309361
319361

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
75calm
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 12 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 72 minutes over May. Sunrise moves from 5:08 AM to 4:33 AM, and sunset from 7:10 PM to 7:45 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.05:087:10
214.15:067:11
314.15:047:12
414.25:037:14
514.25:017:15
614.35:007:16
714.34:597:18
814.44:577:19
914.44:567:20
1014.44:547:21
1114.54:537:23
1214.54:527:24
1314.64:507:25
1414.64:497:26
1514.74:487:27
1614.74:477:29
1714.74:467:30
1814.84:457:31
1914.84:437:32
2014.84:427:33
2114.94:417:34
2214.94:407:35
2315.04:397:37
2415.04:397:38
2515.04:387:39
2615.04:377:40
2715.14:367:41
2815.14:357:42
2915.14:347:43
3015.24:347:44
3115.24:337:45

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.51 kWh/m².

For context, solar energy here swings from a low near 1.02 kWh/m² to a high of 6.83 kWh/m² in July across the year — May's 5.51 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.2Bright
35.3Bright
45.3Bright
55.3Bright
65.4Bright
75.4Bright
85.4Bright
95.4Bright
105.4Bright
115.5Bright
125.5Bright
135.5Bright
145.5Bright
155.5Bright
165.5Bright
175.5Bright
185.5Bright
195.5Bright
205.5Bright
215.5Bright
225.6Bright
235.6Bright
245.6Bright
255.6Bright
265.6Bright
275.7Bright
285.7Bright
295.7Bright
305.7Bright
315.7Bright
Planning a trip in May

Hazard calendar for Bethany

In seasonPeak

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

Bethany'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 Bethany?

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
2.7
Beach & pool
5th-best month of the year

May is a reasonable time to visit Bethany for sightseeing.

What to pack for Bethany in May

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

In May, Bethany sees daytime highs around 67°F and nights near 48°F. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

UV index in Bethany in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bethany peaks around July 17 at about 8 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 1 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateVery highVery highHighModerateLowJul 17UV 8Dec 15UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar4Moderate
Apr5Moderate
May8Very high
Jun7High
Jul8Very high
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Bethany 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 Bethany is worst in September — around 22 µg/m³ PM2.5 (moderate), about 3.0× the cleanest month (January, 7 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1621 µg/m³Jan 117 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb9Good
Mar11Good
Apr11Good
May10Good
Jun9Good
Jul8Good
Aug13Moderate
Sep22Moderate
Oct14Moderate
Nov9Good
Dec7Good
Location & terrain

Where is Bethany?

Bethany sits at 45.6°N, 122.9°W, 184 ft above sea level, in United States. The nearest listed city is Aloha, 4.3 mi away.

Topography around Bethany

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

Within 2 miles, the terrain around Bethany has only modest variations in elevation — a maximum elevation change of 282 ft around an average of 240 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,555 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,990 ft.

The land around Bethany is covered by trees (43%) and artificial surfaces (31%) within 2 miles, trees (51%) within 10 miles, and trees (78%) within 50 miles.

2 miles
282 ft
10 miles
1,555 ft
50 miles
4,990 ft
treesgrasslandcroplandartificial surfacesbare terrainwater
May weather nearby: Aloha 4.3 mi · Beaverton 5.6 mi · Hillsboro 6.2 mi · Portland 9.3 mi · Tigard 9.9 mi · Vancouver 11 mi · Forest Grove 12 mi · Hazel Dell 12 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 Bethany (45.5579°, -122.8676°, elevation 184 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).