worldweather30°Cnear normal
usually 26°C–32°C
night: exceptionally warm
rain: more rain than usual
wind: typical
Weather in Thessaloniki - 14-day forecast
Detailed weather forecast for Thessaloniki, Greece: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Thessaloniki
today☀️
30°💧 0.3 mm
Sun☀️
33°💧 1.1 mm
Mon☀️
30°💧 0.4 mm
Tue☀️
28°💧 0.2 mm
Wed☀️
28°💧 0.2 mm
Thu☀️
27°💧 1.4 mm
Fri☀️
28°💧 1.3 mm
Sat☀️
29°💧 2.6 mm
Forecast vs 1991-2020 climate normal
NASA POWERHow does the current forecast compare with normal?
We compare the coming days with weather usually observed at this time of year.
Sunday 6 Sept in Thessaloniki, the forecast high is 33°C. Typical daytime temperatures at this time of year range from 26°C to 32°C, so it will be exceptionally warm. It is warmer than 90% of similar days.
33°Cexceptionally warm
usually 26°C–32°C
warmer than 90% of similar days
night: exceptionally warm
rain: more rain than usual
wind: stronger than usual
30°Cwarmer than usual
usually 26°C–32°C
warmer than 70% of similar days
night: exceptionally warm
rain: more rain than usual
wind: stronger than usual
28°Cnear normal
usually 26°C–32°C
night: exceptionally warm
rain: typical rainfall
wind: stronger than usual
28°Cnear normal
usually 26°C–31°C
night: exceptionally warm
rain: typical rainfall
wind: stronger than usual
27°Cnear normal
usually 26°C–31°C
night: exceptionally warm
rain: more rain than usual
wind: typical
28°Cnear normal
usually 25°C–31°C
night: exceptionally warm
rain: more rain than usual
wind: typical
How warm was this week in previous years?
Each bar shows the average daily high during the same 7-day period in each year.
cooler yearstypical rangewarmer years2026 forecastcurrent forecast
From 1981 to 2025, the 5-11 Sept period averaged 28°C by day. The coolest year was 1996 (23°C) and the warmest was 2008 (33°C). The current forecast averages 29°C - higher than in 69% of historical years.
Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.
Weather warnings - Thessaloniki
Heatyellow level
from 5 Sept, 12:00 to 5 Sept, 18:00
Areas: CENTRAL MAKEDONIA
High temperatures and risk of overheating. Drink plenty of water, avoid the midday sun and look after the elderly.
Source: national weather service via Meteoalarm (EUMETNET). Yellow - be aware, orange - be prepared, red - take action.
14-day forecast - Thessaloniki
Thessaloniki 30 & 45-day weather - long-range outlook
Next 16 days · forecast
27°
around 23° at night · days with rain: 9
Weeks 3-4 · avg for September
27°
around 17° at night · rain chance 34%
Weeks 5-7 · avg for October
21°
around 13° at night · rain chance 29%
The 30 & 45-day outlook for Thessaloniki: the next 16 days are a numerical forecast updated daily - on average 27° by day and 23° at night. Further out we rely on multi-year climate averages: around 27° in September, and about 21° in October. Forecasts beyond two weeks are indicative only.
Day-by-day forecast for Thessaloniki
Saturday5 September 2026
☀️30°clear sky
Sunday6 September 2026
☀️33°clear sky
Monday7 September 2026
☀️30°clear sky
Tuesday8 September 2026
☀️28°clear sky
Wednesday9 September 2026
☀️28°clear sky
Thursday10 September 2026
☀️27°clear sky
Friday11 September 2026
☀️28°clear sky
Saturday12 September 2026
☀️29°clear sky
Sunday13 September 2026
☀️30°clear sky
Monday14 September 2026
🌤️25°a few clouds
Tuesday15 September 2026
🌧️25°light rain
Wednesday16 September 2026
☁️26°overcast clouds
Thursday17 September 2026
☀️28°clear sky
Friday18 September 2026
🌧️27°light rain
Saturday19 September 2026
🌧️21°moderate rain
Sunday20 September 2026
🌧️16°light rain
UV index in Thessaloniki - is it safe to sunbathe?
Today the UV index in Thessaloniki is 7 (high) - unprotected fair skin can burn in about 30 minutes. SPF 30-50, a hat and sunglasses are a must. Better stay in shade between 11:00 and 15:00.
Pollen in Thessaloniki - info for allergy sufferers
Today ragweed pollen is highest in Thessaloniki - about 11 grains/m³, moderate level. Most allergy sufferers should not feel strong symptoms. Pollen levels are a CAMS model forecast and are indicative.
Sea temperature - Thessaloniki
Water today
30°C
Week avg
30°C
Waves today
0 m
How's the water?
very warm
16-day sea temperature forecast:
Average sea temperature through the year:
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.
Thessaloniki weather through the year
Warmest, driest months on average: March, April, May, June.
Upcoming public holidays in Greece: Ochi Day — 28 October · Christmas Day — 25 December · St. Stephen's Day — 26 December.
Nearby and related places
FAQ - Thessaloniki weather
What is the weather like in Thessaloniki today?
Today it is about 30° during the day and 23° at night, clear sky.
How far ahead can I check the forecast for Thessaloniki?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.