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Weather in Bolu for September 2025

Your guide to Bolu weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Bolu has been nearly identical to the historical average, with a temperature of 25.4 °C (showing only a slight deviation of -0.5 °C).

  • Expect cooler weather in the next days in Bolu with the forecast suggesting a temperature of 23.1 °C, lower than the historical average.

  • In general, the average temperature in Bolu at the beginning of September is 26.1 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 24.6 °C by the end of September.

    • Rain 🌧️

  • The climate of Bolu in September is notably wet, with an average of 14 rainy days, and a total of 97.5 mm of precipitation.

Average dry days
16
Dry days
Average rainy days
14
Rainy days
Average snowy days
0
Snow days
Average temperatures
24°/10°
Temperatures
Average wind speed
11 km/h
Avg max wind
Average humidity
70 %
Avg humidity

Bolu Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Patchy light rain with thunder
27°
2
Moderate or heavy rain shower
26°
3
Patchy rain possible
26°
4
Partly cloudy
29°
5
Sunny
28°
6
Sunny
24°
7
Patchy rain possible
23°
8
Thundery outbreaks possible
22°
9
Patchy rain possible
25°
10
Sunny
27°
11
Patchy rain possible
26°
12
Patchy rain possible
27°
13
Sunny
27°
14
Sunny
29°
15
Sunny
26°
16
Sunny
23°
17
Sunny
28°
18
Heavy rain
12°
19
Moderate rain
16°
20
Patchy rain possible
18°
21
Sunny
22°
22
Sunny
24°
23
Patchy rain possible
25°
24
Sunny
25°
25
Sunny
24°
26
Sunny
25°
27
Sunny
27°
28
Sunny
28°
29
Sunny
28°
30
Moderate or heavy rain shower
15°

Temperatures trend during September in Bolu

See the weather trend as well as the moving average line

September weather in Bolu day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Patchy light rain with thunder
Patchy light rain with thunder
 27° /11° 6.3 mm 7
2 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 26° /12° 6.1 mm 6
3 Sept. Patchy rain possible
Patchy rain possible
 26° /10° 3.2 mm 6
4 Sept. Partly cloudy
Partly cloudy
 29° /9° 0 mm 8
5 Sept. Sunny
Sunny
 28° /10° 1.5 mm 7
6 Sept. Sunny
Sunny
 24° /9° 3.3 mm 6
7 Sept. Patchy rain possible
Patchy rain possible
 23° /10° 1.2 mm 6
8 Sept. Thundery outbreaks possible
Thundery outbreaks possible
 22° /9° 0.9 mm 5
9 Sept. Patchy rain possible
Patchy rain possible
 25° /9° 0.2 mm 6
10 Sept. Sunny
Sunny
 27° /10° 0 mm 7
11 Sept. Patchy rain possible
Patchy rain possible
 26° /10° 0.4 mm 6
12 Sept. Patchy rain possible
Patchy rain possible
 27° /11° 1.2 mm 7
13 Sept. Sunny
Sunny
 27° /12° 0.2 mm 6
14 Sept. Sunny
Sunny
 29° /14° 0 mm 7
15 Sept. Sunny
Sunny
 26° /7° 0 mm 1.6
16 Sept. Sunny
Sunny
 23° /7° 0 mm 1.7
17 Sept. Sunny
Sunny
 28° /7° 0 mm 1.6
18 Sept. Heavy rain
Heavy rain
 12° /10° 21.8 mm 0.6
19 Sept. Moderate rain
Moderate rain
 16° /7° 11.2 mm 0.7
20 Sept. Patchy rain possible
Patchy rain possible
 18° /5° 0.2 mm 3
21 Sept. Sunny
Sunny
 22° /7° 0 mm 4
22 Sept. Sunny
Sunny
 24° /7° 0 mm 4
23 Sept. Patchy rain possible
Patchy rain possible
 25° /10° 0.2 mm 4
24 Sept. Sunny
Sunny
 25° /9° 0 mm 5
25 Sept. Sunny
Sunny
 24° /8° 0 mm 5
26 Sept. Sunny
Sunny
 25° /8° 0 mm 5
27 Sept. Sunny
Sunny
 27° /10° 0 mm 5
28 Sept. Sunny
Sunny
 28° /10° 0 mm 5
29 Sept. Sunny
Sunny
 28° /11° 0 mm 7
30 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 15° /4° 28.9 mm 4
Next
Important Notice
Our weather forecast for Bolu in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Bolu forecast closer to your planned date for the most up-to-date weather information.
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Bolu in September - FAQ

What are the expected maximum and minimum temperatures in Bolu during September?
Enjoy moderate daytime temperatures of up to 24° and cooler nights around 10°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Bolu during September?
Moderate rainfall is anticipated in Bolu during September, with a total of 97.5 mm spread over approximately 14 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Bolu during September?
The average wind speed in Bolu during September is 11 km/h, suggesting breezy to windy conditions, depending on your activities.

September rainfall patterns in Bolu

Explore the daily rainfall trends and prepare for Bolus September weather 💧

UV exposure in Bolu during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

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Location coordinates Where is Bolu?

Get accurate weather forecasts for Bolu, located at latitude 40.736 and longitude 31.606. Stay updated with localized weather information tailored for Bolu.

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