AI-generatedSumy at a glance
- Best time
- May – Sep
- Warmest month
- Jul · 27°
- Sunshine a year
- 2,020 h
- Rain a year
- 602 mm
- Climate
- Continental
- Time zone
- UTC+2 / UTC+3
- Elevation
- 171 m
Climate in Sumy
Sumy has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 27 °C, while January is the coolest at −2 °C. With around 2,020 hours of sunshine a year, Sumy is moderately sunny; June is the sunniest month with 10.3 hours a day.
Holiday weather through the year
Best time to visit Sumy
The best time to visit Sumy is from May to September. For sightseeing, day trips and hiking, conditions are most comfortable from May to September. The wettest month is July with 75 mm of precipitation.
Sumy through the seasons
How the weather changes over the seasons, with averages for each.
Sumy in spring
Mar – May
Fair
- 6–21 °C by day
- 6.7 h of sun a day
- 30 rainy days in all
Sumy in summer
Jun – Aug
Excellent
- 25–27 °C by day
- 9.8 h of sun a day
- 30 rainy days in all
Sumy in autumn
Sep – Nov
Fair
- 5–20 °C by day
- 3.9 h of sun a day
- 25 rainy days in all
Sumy in winter
Dec – Feb
Poor
- −2–0 °C by day
- 1.6 h of sun a day
- 29 rainy days in all
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
May – Sep
15–28 °C and not too much rain
Snow
Nov – Mar
Snow on 2 or more days
Find your perfect month
Tell us what you like and we rate every month in Sumy for you.
Your best months: May – June, August
Based on the climate averages; tap a month to see its details.
Weather in October
Weather in October
Holiday weather in October
Fair
Best time to visit: May – September
A typical day in October
- Morning, 08:00: about 6°
- Midday, 13:00: about 12°
- Afternoon, 16:00: about 12°
- Evening, 20:00: about 8°
- Night, 23:00: about 7°
07:0217:51
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 06:42–07:47 · evening 17:06–18:11
- Blue hour
- Morning 06:29–06:42 · evening 18:11–18:24
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
October in Sumy compared with home
Loading the climate at home …
Early or late October?
In October, daytime highs fall from about 16° at the start of the month to 9° at the end. The days get 1.8 h shorter.
| October | 1 Oct | 31 Oct |
|---|---|---|
| Daytime high | 16° | 9° |
| Night-time low | 7° | 2° |
| Daylight | 11.7 h | 9.9 h |
What is the weather like in Sumy in October?
In October, Sumy is cool: daytime highs average 13 °C, and nights cool down to about 4 °C. The sun is scarce, with only about 3.8 hours a day. Rain is frequent, with about 9 rainy days and 52 mm in total. All in all, October is a so-so month for a holiday in Sumy.
More details for October
- Daylight
- 10 h 49 min07:02 – 17:51
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 70 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+3offset from UTC
How the score comes together
- Temperatureweight 50 %45 %
- Sunshineweight 20 %13 %
- Few rainy daysweight 30 %64 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- A jumper for the evenings
- Rain jacket or umbrella
Compare two months in Sumy
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
August has the better holiday weather in Sumy: score 93 against 44. In August, days are 13 °C warmer than in October. August has 2 fewer rainy days. The sun shines 5 hours longer a day in August.
| Month | October | August |
|---|---|---|
| Holiday weather score | 44 | 93better |
| Daytime high | 13° | 26° |
| Night-time low | 4° | 15° |
| Sunshine | 3.8 h | 9.1 hbetter |
| Rainy days | 9 | 7better |
| Rainfall | 52 mm | 48 mm |
| Muggy days | 0better | 1 |
Based on the climate averages 1996–2025.
Sumy month by month
The typical weather for every month at a glance.
17January−2° · 1.3 h
In January, Sumy is bitterly cold: daytime highs average −2 °C, and nights often drop below freezing (−8 °C). The sun is scarce, with only about 1.3 hours a day. Precipitation falls on about 10 days, totalling 43 mm; on about 7 of them it snows. All in all, January is not an ideal month for a holiday in Sumy.
Sumy in January19February−1° · 2.6 h
In February, Sumy is bitterly cold: daytime highs average −1 °C, and nights often drop below freezing (−8 °C). The sun is scarce, with only about 2.6 hours a day. Precipitation falls on about 9 days, totalling 37 mm; on about 6 of them it snows. All in all, February is not an ideal month for a holiday in Sumy.
Sumy in February23March6° · 4.4 h
In March, Sumy is cold: daytime highs average 6 °C, and nights often drop below freezing (−3 °C). Expect around 4.4 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 42 mm in total. Snow falls on about 4 days. All in all, March is not an ideal month for a holiday in Sumy.
Sumy in March65April15° · 6.6 h
In April, Sumy is cool: daytime highs average 15 °C, and nights cool down to about 4 °C. The sun shines for around 6.6 hours a day. Rain is frequent, with about 10 rainy days and 44 mm in total. All in all, April is a good month for a holiday in Sumy.
Sumy in April86May21° · 9.0 h
In May, Sumy is warm: daytime highs average 21 °C, and nights cool down to about 10 °C. With around 9.0 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 11 rainy days and 58 mm in total. All in all, May is an excellent month for a holiday in Sumy.
Sumy in May85June25° · 10.3 h
In June, Sumy is warm: daytime highs average 25 °C, and nights cool down to about 14 °C. With around 10.3 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 11 rainy days and 65 mm in total. All in all, June is an excellent month for a holiday in Sumy.
Sumy in June84July27° · 10.1 h
In July, Sumy is hot: daytime highs average 27 °C, and nights cool down to about 16 °C. With around 10.1 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 11 rainy days and 75 mm in total. On about 7 days the thermometer climbs to 30 °C or more. All in all, July is an excellent month for a holiday in Sumy.
Sumy in July93August26° · 9.1 h
In August, Sumy is warm: daytime highs average 26 °C, and nights cool down to about 15 °C. With around 9.1 hours of sunshine a day, there is plenty of sun. Rain falls on about 7 days, adding up to 48 mm. On about 6 days the thermometer climbs to 30 °C or more. All in all, August is an excellent month for a holiday in Sumy.
Sumy in August83September20° · 6.4 h
In September, Sumy is mild: daytime highs average 20 °C, and nights cool down to about 10 °C. Expect around 6.4 hours of sunshine a day. Rain falls on about 8 days, adding up to 49 mm. All in all, September is an excellent month for a holiday in Sumy.
Sumy in September44October13° · 3.8 h
In October, Sumy is cool: daytime highs average 13 °C, and nights cool down to about 4 °C. The sun is scarce, with only about 3.8 hours a day. Rain is frequent, with about 9 rainy days and 52 mm in total. All in all, October is a so-so month for a holiday in Sumy.
Sumy in October20November5° · 1.6 h
In November, Sumy is cold: daytime highs average 5 °C, and nights often drop below freezing (−1 °C). The sun is scarce, with only about 1.6 hours a day. Rain falls on about 9 days, adding up to 45 mm. Snow falls on about 2 days. All in all, November is not an ideal month for a holiday in Sumy.
Sumy in November17December0° · 1.0 h
In December, Sumy is bitterly cold: daytime highs average 0 °C, and nights often drop below freezing (−5 °C). The sun is scarce, with only about 1.0 hours a day. Precipitation falls on about 10 days, totalling 45 mm; on about 6 of them it snows. All in all, December is not an ideal month for a holiday in Sumy.
Sumy in DecemberClimate in detail
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Sumy
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
- Pleasant 15–20°
ColdOctober: nights around 4°. The room should be heated.
The coolest nights are in February (−8°), the warmest in July (16°). Nights are pleasant for sleeping (15 to 20 °C) from July to August. Nights fall below 8 °C on average from October to April, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 17 | −2° | −8° | 1.3 h | 10 | 43 |
| FebruaryFeb | 19 | −1° | −8° | 2.6 h | 9 | 37 |
| MarchMar | 23 | 6° | −3° | 4.4 h | 10 | 42 |
| AprilApr | 65 | 15° | 4° | 6.6 h | 10 | 44 |
| MayMay | 86 | 21° | 10° | 9.0 h | 11 | 58 |
| JuneJun | 85 | 25° | 14° | 10.3 h | 11 | 65 |
| JulyJul | 84 | 27° | 16° | 10.1 h | 11 | 75 |
| AugustAug | 93 | 26° | 15° | 9.1 h | 7 | 48 |
| SeptemberSep | 83 | 20° | 10° | 6.4 h | 8 | 49 |
| OctoberOct | 44 | 13° | 4° | 3.8 h | 9 | 52 |
| NovemberNov | 20 | 5° | −1° | 1.6 h | 9 | 45 |
| DecemberDec | 17 | 0° | −5° | 1.0 h | 10 | 45 |
Climate averages 1996–2025 (sunshine partly WMO station normals 1991–2020), not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
50.92° N, 34.80° E · 171 m · Europe/Kyiv
Sunshine hours in Sumy
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 3.8 of 10.8 hours of daylight in Sumy, 35 % of the daylight hours.
Sunshine hours: estimated from radiation data (ERA5, 1996–2025) and calibrated against measured station values; no weather station is close enough here. Daylight is the time from sunrise to sunset on the 15th of the month.
Rain in Sumy: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Sumy has about 9 rainy days with 52 mm of rain in total.
UV index in Sumy
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 8).
Minutes until sunburn in October
- Very fair skin
- about 65 min
- Fair skin
- about 80 min
- Light brown skin
- about 115 min
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen the time, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Wind and clouds in Sumy
How breezy and how cloudy Sumy is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Sumy typically peaks at 19 km/h during the day: Beaufort 3, gentle breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 70 % of the sky over Sumy: mostly cloudy, with about 3.8 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Sumy
How often the day gets hot in Sumy (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Sumy has about 0 hot days, with an average daytime high of 13 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Sumy
When Sumy is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, it hardly ever snows in Sumy.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Planning a trip to Sumy
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Sumy in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Sumy has its best school-holiday weather during the summer holidays (score 90) and its weakest during the Christmas holidays (score 17).
- 52
Easter holidays
Mar – Apr
Fair
- 12 °C by day
- 5.9 h of sun a day
- 10 rainy days a month
Keep in mind: Snow
- 86
May half-term
May – Jun
Excellent
- 22 °C by day
- 9.3 h of sun a day
- 11 rainy days a month
Good for: Sightseeing & walks
- 90
Summer holidays
Jul – Aug
ExcellentBest holidays
- 27 °C by day
- 9.5 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
- 44
October half-term
Oct
Fair
- 13 °C by day
- 3.8 h of sun a day
- 9 rainy days a month
- 17
Christmas holidays
Dec – Jan
Poor
- −1 °C by day
- 1.2 h of sun a day
- 10 rainy days a month
Keep in mind: Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 3 h 25 min
- Distance
- 2,430 km
- Time zone
- UTC+3
- Jet lag
- Hardly any (under 3 h)
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Compare & alternatives
Sumy compared
Put Sumy side by side with another destination.
Sumy vs Kursk
In October Sumy has the better holiday weather (score 44 vs 36). During the day Kursk is 2 °C cooler than Sumy.
| in October | Sumy | Kursk |
|---|---|---|
| Holiday weather score | 44 | 36 |
| Daytime high | 13° | 11° |
| Sunshine | 4 h | 4 h |
| Rainy days | 9 | 10 |
| Best time | May – Sep | May – Sep |
Through the year
Ukraine in October: the best places
In October, Sumy ranks 25 among the 31 nearest destinations in this country.
- Odesa17°16°78
- 2Melitopol17°77
- 3Bilhorod-Dnistrovskyi16°77
- 4Mykolaiv17°16°76
- 5Kryvyi Rih16°69
- 6Mariupol15°14°69
- 7Zaporizhzhia15°67
- 8Pavlohrad15°64
- 25SumyThis page13°44
Near Sumy
Other destinations close by.
Places with a climate like Sumy
Destinations whose weather through the year is closest to Sumy's – good alternatives.
Frequently asked questions about Sumy
When is the best time to visit Sumy?
The best time to visit Sumy is from May to September. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Sumy?
July is the warmest month, with average highs of 27 °C and nights around 16 °C. January is the coolest month at −2 °C.
When does it rain most in Sumy?
The wettest month is July with 75 mm of precipitation. The driest month is February with 37 mm.
How many hours of sunshine does Sumy get?
Sumy gets around 2,020 hours of sunshine a year. The sunniest month is June with 10.3 hours a day; in December there are 1.0 hours a day.
What time zone is Sumy in?
Sumy is on UTC+2 in January and UTC+3 in July.
How long is the flight from London to Sumy?
A nonstop flight from London to Sumy takes about 3 h 25 min, for a straight-line distance of about 2,430 km.
Which school holidays are best for Sumy?
Sumy has its best school-holiday weather during the summer holidays (score 90) and its weakest during the Christmas holidays (score 17). Holiday ratings (0–100): Easter holidays 52, May half-term 86, summer holidays 90, October half-term 44, Christmas holidays 17.