Roscommon County Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Roscommon County, Ireland in September.

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Boyle Roscommon Ballyfarnon Strokestown

Planning a trip to Roscommon County, Ireland this September? Here's what you need to know about the weather:

What to Expect in Roscommon County in September

Roscommon County, Ireland is a region in Ireland. September in Roscommon County generally has mild temperatures, with moderate precipitation.

Temperatures

You can expect mild maximum daytime temperatures of around 17°C (63°F) and nighttime temperatures around 10°C (50°F) in Boyle.

For a closer look at conditions across Roscommon County, Ireland, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From moderate rainfall in Roscommon with an average of 83 mm (3.3 in) to moderate rainfall in Ballyfarnon with 95 mm (3.7 in).

Average sunshine

Sunshine is quite limited in many locations during September. Boyle receives roughly 93 hours of sunlight. For destinations with more sunshine, our weather planner offers alternatives worldwide.

Explore Roscommon County by month

Pick a month to see the average temperature, rainfall and sunshine in Roscommon County — and find the best time to visit. (based on Boyle)

January9°C (48°F) February9°C (48°F) March11°C (52°F) April13°C (55°F) May16°C (61°F) June18°C (64°F) This monthJuly19°C (66°F) August19°C (66°F) September17°C (63°F) October14°C (57°F) November11°C (52°F) December9°C (48°F)
Best Time to Visit Roscommon County →

Best Places to Visit in Roscommon County in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Roscommon County.

Conditions Temperatures Precipitation
perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Roscommon County

What is the weather like in September for some of the most popular destinations in Roscommon County, Ireland?

Temperature range in Roscommon County (September)

Precipitation variation in Roscommon County (September)

Boyle

In September Boyle generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
17°C (63°F)
14°C (57°F)
Min temperature
12°C (54°F)
10°C (50°F)
7°C (45°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
110 mm (4.3 in)
92 mm (3.6 in)
110 mm (4.3 in)
Monthly rainy days
20 days
21 days
22 days
Weather conditions
tolerable
tolerable
unpleasant
Climate in Boyle →

Roscommon

In September Roscommon generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
14°C (57°F)
Min temperature
12°C (54°F)
10°C (50°F)
8°C (46°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
98 mm (3.9 in)
83 mm (3.3 in)
97 mm (3.8 in)
Monthly rainy days
19 days
19 days
21 days
Weather conditions
pleasant
pleasant
tolerable
Climate in Roscommon →

Ballyfarnon

In September Ballyfarnon generally has moderate temperatures with maximum daytime temperatures around 17°C (63°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are tolerable that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
17°C (63°F)
14°C (57°F)
Min temperature
12°C (54°F)
10°C (50°F)
7°C (45°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
113 mm (4.4 in)
95 mm (3.7 in)
112 mm (4.4 in)
Monthly rainy days
20 days
21 days
22 days
Weather conditions
tolerable
tolerable
unpleasant
Climate in Ballyfarnon →

Strokestown

In September Strokestown generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
14°C (57°F)
Min temperature
12°C (54°F)
10°C (50°F)
8°C (46°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
100 mm (3.9 in)
84 mm (3.3 in)
98 mm (3.9 in)
Monthly rainy days
20 days
20 days
21 days
Weather conditions
tolerable
pleasant
tolerable
Climate in Strokestown →

Castlerea

In September Castlerea generally has moderate temperatures with maximum daytime temperatures around 18°C (64°F), minimum nighttime temperatures around 10°C (50°F) and moderate monthly rainfall. So on average the conditions are pleasant that month.

« August
September
October »
August
September
October
Max temperature
19°C (66°F)
18°C (64°F)
14°C (57°F)
Min temperature
12°C (54°F)
10°C (50°F)
7°C (45°F)
Monthly sun hours
118 hours
93 hours
74 hours
Monthly rainfall
101 mm (4 in)
87 mm (3.4 in)
103 mm (4.1 in)
Monthly rainy days
20 days
20 days
22 days
Weather conditions
tolerable
pleasant
unpleasant
Climate in Castlerea →

Is your destination not in the list? Have a look at all destinations in Roscommon County, in Ireland.

Popular cities in September

Day & night temperatures, rainfall and average weather in Roscommon County in September.

City Weather Day temp Night temp Rainfall
Boyle 17°C (63°F) 10°C (50°F) 92 mm (3.6 in)
Roscommon 18°C (64°F) 10°C (50°F) 83 mm (3.3 in)
Ballyfarnon 17°C (63°F) 10°C (50°F) 95 mm (3.7 in)
Strokestown 18°C (64°F) 10°C (50°F) 84 mm (3.3 in)
Castlerea 18°C (64°F) 10°C (50°F) 87 mm (3.4 in)

Roscommon County weather in September: frequently asked questions

What is the weather like in Roscommon County, Ireland in September?

Roscommon County, Ireland typically experiences tolerable weather in September, part of the season. Daytime highs in Boyle average around 17°C (63°F), and temperatures drop to about 10°C (50°F) at night.

What is the average temperature in Roscommon County, Ireland in September?

Boyle averages a daytime maximum of 17°C (63°F) in September, with overnight lows close to 10°C (50°F).

Does Roscommon County, Ireland get a lot of rain in September?

September is on the drier side in Roscommon County, Ireland. Boyle averages only about 92 mm (3.6 in), with most days staying dry.

Is September a Good Time to Visit Roscommon County, Ireland?

We believe that September is one of the best times to visit Roscommon County, Ireland with overall tolerable weather in Boyle. It's worth noting that weather conditions might differ depending on the location you visit.

Generally speaking, May, June, July, August and September provide tolerable weather in Boyle. On the other hand, the weather in January, February, November and December tend to be poor.

Interested in more climate information?

We have much more information about the climate in Roscommon County.

Weather and climate has detailed information for every country in the world. Are you going to Ireland? Get detailed historical weather averages for many cities in Ireland.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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