Rosny-sous-Bois weather in May

In May, Rosny-sous-Bois sees average daytime highs of 19°C and overnight lows near 10°C, with 65 mm of rain across 11.1 wet days and about 15 hours of daylight. It is the 5th-warmest and 2nd-wettest month of the year here.

Highs climb over the month, from about 17°C in the first days to 21°C by the end. The sky is clear or mostly clear about 18% of the time in May, and the air most often feels dry.

Daylight stretches from about 14 h 18 min at the start of May to 15 h 36 min by month's end. Set against the rest of the year, May is Rosny-sous-Bois's 6th-clearest and 8th-windiest month. For the whole year in context, see Rosny-sous-Bois's year-round climate.

Daytime high
19°
5th warmest
Overnight low
10°
8th coldest
Rainfall
65 mm
11.1 wet days
Daylight
15 hours
5:15 AM – 8:18 PM
Cloud cover
68%
6th clearest
Wind
12 km/h
8th windiest
Solar energy
5.23 kWh/m²
Travel score
5.7
out of 10

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 17°C in the first days to 21°C by the end.

A typical May day in Rosny-sous-Bois reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 14°C and 25°C. Set against its neighbours, May runs about 4°C warmer than April and about 3°C cooler than June.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
1178
2178
3178
4178
5178
6189
7189
8189
9189
10189
11189
12189
13189
14199
15199
16199
171910
181910
191910
201910
212010
222010
232010
242010
252011
262011
272011
282011
292111
302111
312111

How May really feels in Rosny-sous-Bois

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
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.

Rosny-sous-Bois weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 2nd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / 5311.40.88.50.7
Feb / 499.91.19.81.3
Mar12° / 5210.60.511.63.0
Apr15° / 5110.8013.44.5
May19° / 10°6511.10155.7
Jun22° / 13°5610.7015.96.4
Jul25° / 15°559.1015.57.0
Aug25° / 14°579014.27.0
Sep21° / 11°488.3012.46.5
Oct16° / 6311.3010.54.6
Nov10° / 5911.50.28.92.3
Dec / 7112.60.98.11.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 18% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 13% of May, with mostly cloudy or overcast conditions the remaining 68%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
12872
22872
32773
42872
52872
62872
72872
83070
93070
103070
113169
123268
133268
143268
153268
163268
173268
183367
193367
203367
213367
223367
233466
243466
253466
263466
273367
283466
293466
303466
313466

Chance of precipitation in May

Any precipitation

Rosny-sous-Bois gets around 65 mm 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 37% and peaks near 42% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
142
242
342
442
542
641
741
840
940
1040
1139
1239
1339
1438
1537
1637
1736
1835
1935
2034
2134
2234
2333
2433
2533
2634
2734
2835
2936
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 86% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19640
29640
39550
49460
59460
69370
79280
89280
99091
109091
1189101
1289101
1389101
1488111
1588111
1687121
1787121
1885132
1985132
2085132
2183143
2282153
2382153
2480164
2579174
2677185
2776195
2874206
2973216
3072217
3171227

Wind in May

Winds average 12 km/h in May.

Across May, daily wind ranges from about 12 km/h on the calmest days to 13 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512calm
2612calm
2712calm
2812calm
2912calm
3012calm
3112calm

Sunrise & sunset in May

DaylightNight

Daylight runs from about 14 h 18 min at the start of May to 15 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 78 minutes over May. Sunrise moves from 5:38 AM to 4:59 AM, and sunset from 7:56 PM to 8:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
114.35:387:56
214.45:377:58
314.45:357:59
414.55:338:01
514.55:318:02
614.65:308:03
714.65:288:05
814.75:278:06
914.75:258:08
1014.85:238:09
1114.85:228:11
1214.95:208:12
1314.95:198:13
1415.05:188:15
1515.05:168:16
1615.05:158:18
1715.15:148:19
1815.15:128:20
1915.25:118:22
2015.25:108:23
2115.35:098:24
2215.35:088:25
2315.35:068:27
2415.45:058:28
2515.45:048:29
2615.55:038:30
2715.55:028:31
2815.55:018:33
2915.65:018:34
3015.65:008:35
3115.64:598:36

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.23 kWh/m².

For context, solar energy here swings from a low near 0.77 kWh/m² to a high of 5.56 kWh/m² in June across the year — May's 5.23 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
14.8Bright
24.8Bright
34.8Bright
44.8Bright
54.9Bright
64.9Bright
74.9Bright
85.0Bright
95.0Bright
105.0Bright
115.1Bright
125.1Bright
135.2Bright
145.2Bright
155.2Bright
165.3Bright
175.3Bright
185.3Bright
195.3Bright
205.4Bright
215.4Bright
225.4Bright
235.4Bright
245.4Bright
255.4Bright
265.4Bright
275.5Bright
285.5Bright
295.5Bright
305.4Bright
315.4Bright
Planning a trip in May

Is May a good time to visit Rosny-sous-Bois?

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

5.7
Sightseeing
5th-best month of the year
2.4
Beach & pool
5th-best month of the year

May is a reasonable time to visit Rosny-sous-Bois for sightseeing.

What to pack for Rosny-sous-Bois in May

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

In May, Rosny-sous-Bois sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear and sun protection. About 11 days see rain.

rain gearsun protection

UV index in Rosny-sous-Bois in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May 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 Rosny-sous-Bois peaks around June 23 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 23UV 7Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Low
Mar3Moderate
Apr5Moderate
May6High
Jun7High
Jul7High
Aug7High
Sep4Moderate
Oct3Moderate
Nov1Low
Dec1Low

Air quality in Rosny-sous-Bois 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 Rosny-sous-Bois is worst in April — around 20 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateApr 1020 µg/m³Jul 2014 µg/m³
PM2.5 (µg/m³)Level
Jan17Moderate
Feb17Moderate
Mar20Moderate
Apr20Moderate
May17Moderate
Jun16Moderate
Jul13Moderate
Aug14Moderate
Sep15Moderate
Oct15Moderate
Nov15Moderate
Dec15Moderate
Location & terrain

Where is Rosny-sous-Bois?

Rosny-sous-Bois sits at 48.9°N, 2.5°E, 83 m above sea level, in France. The nearest listed city is Neuilly-Plaisance, 1.0 km away.

Topography around Rosny-sous-Bois

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Rosny-sous-Bois.

Within 3 km, the terrain around Rosny-sous-Bois has only modest variations in elevation — a maximum elevation change of 90 m around an average of 71 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 140 m; within 80 km, significant variations in elevation — a maximum elevation change of 256 m.

The land around Rosny-sous-Bois is covered by artificial surfaces (68%) and trees (28%) within 3 km, artificial surfaces (56%) and trees (30%) within 16 km, and cropland (53%) and trees (34%) within 80 km.

3 km
90 m
16 km
140 m
80 km
256 m
treesgrasslandcroplandartificial surfaceswater
May weather nearby: Neuilly-Plaisance 1.0 km · Villemomble 1.0 km · Fontenay-sous-Bois 2.0 km · Le Perreux-sur-Marne 2.0 km · Gagny 3.0 km · Noisy-le-Sec 3.0 km · Bondy 4.0 km · Nogent-sur-Marne 4.0 km

France travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / E
230 V · 50 Hz
Prices
≈ 77% of US
price level, 2025
GDP per capita
$48,986
2025
Happiness
6.6 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.3
per 100k, 2023
Road deaths
5.1
per 100k/yr, 2019
Income group
High
World Bank
English
Moderate
EF EPI 539
Religion
Roman Catholic 47%none 33%Muslim 4%Protestant 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 Rosny-sous-Bois (48.8702°, 2.4991°, elevation 83 m), 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).