Avg High
Reykjavik in August
Avg Low
Rain
Daylight
16h
What to expect
Reykjavik is in late summer during August, with the season well established by this point. It usually feels cool and fresh, with a fairly even feel across the day. Daylight stays generous for longer outdoor plans. Conditions tend to feel steady, which makes planning simple.
August in context
How it compares to the rest of the year in Reykjavik.
Hottest (avg)
#2 / 12
Wettest (avg)
#9 / 12
Daylight Hours
#4 / 12
Windiest (avg)
#10 / 12
Highest UV
#4 / 12
Most Humid
#4 / 12
Monthly climate breakdown
Temperature
- Daytime high
-
- Nighttime low
-
- Feels like (avg)
-
Sunshine
- Daylight hours
- 16.3 h
- UV index (max)
- 5
- Typical sun hours
- 05:22 - 21:40
Rain & Snow
- Total rain
-
- Rainy days
- 18 days
- Cloud cover (avg)
- 77%
Humidity & Wind
- Humidity (avg)
- 82%
- Wind (avg)
-
- Wind (max gusts)
-
Daily climate explorer
Day 15 selected for August. Typical high 13.2°C and low 8.5°C.
Typical disruptions in August
Based on 30 years of historical data, these are the disruption patterns most likely to affect plans in August.
Cold High impact
Cold feels-like nights Measures: Cold feels-like nights (min <=5C). Observed about 38% of days (11.9 days/month) in August. Historical risk signal only, not a day-by-day forecast.
11.9 days / month
~38% of days
Why this matters
- Expected days 11.9 days / month
- Probability ~38% of days
- Intensity Up to ~5°C (P95)
Cold feels-like nights are possible on ~12 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Rain High impact
Rain disruption Measures: Likely rain disruption days. Observed about 24% of days (7.6 days/month) in August. Historical risk signal only, not a day-by-day forecast.
7.6 days / month
~24% of days
Why this matters
- Expected days 7.6 days / month
- Probability ~24% of days
- Intensity Up to ~22mm (P95)
Rain disruption risk appears on ~8 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain High impact
Washout risk Measures: Washout day risk. Observed about 24% of days (7.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
7.5 days / month
~24% of days
Why this matters
- Expected days 7.5 days / month
- Probability ~24% of days
- Intensity Up to ~22mm (P95)
Washout conditions are possible on ~8 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Strong gusts Measures: Strong gust days (>=60 km/h). Observed about 10% of days (3.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
3.2 days / month
~10% of days
Why this matters
- Expected days 3.2 days / month
- Probability ~10% of days
- Intensity Up to ~84km/h (P95)
Strong gusts are possible on ~3 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Wind High impact
Stormy conditions Measures: Storm-impact proxy days. Observed about 7% of days (2.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
2.0 days / month
~7% of days
Why this matters
- Expected days 2.0 days / month
- Probability ~7% of days
- Intensity Up to ~84km/h (P95)
Stormy conditions are possible on ~2 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Visibility Moderate
Fog-likely signal Measures: Fog-likely visibility proxy. Observed about 13% of days (4.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
4.0 days / month
~13% of days
Why this matters
- Expected days 4.0 days / month
- Probability ~13% of days
- Intensity Up to ~97% (P95)
Fog-likely conditions are possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Show all disruptions (16 more)
Rain High impact
Washout run Measures: Multi-day washout runs. Observed about 1.9 days/month in August. Historical risk signal only, not a day-by-day forecast.
1.9 days / month
Probability unavailable
Why this matters
- Expected days 1.9 days / month
- Probability —
- Intensity Up to ~24mm (P95)
Multi-day washout runs are possible on ~2 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind High impact
Severe gusts Measures: Severe gust days (>=80 km/h). Observed about 1% of days (0.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.3 days / month
~1% of days
Why this matters
- Expected days 0.3 days / month
- Probability ~1% of days
- Intensity Up to ~96km/h (P95)
Severe gusts are possible on ~0 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Rain High impact
Very heavy rain Measures: Very heavy rain days (>=25mm). Observed about 1% of days (0.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.2 days / month
~1% of days
Why this matters
- Expected days 0.2 days / month
- Probability ~1% of days
- Intensity Up to ~32mm (P95)
Very heavy rain is possible on ~0 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Rain Moderate
Heavy rain days Measures: Heavy rain days (>=10mm). Observed about 11% of days (3.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
3.3 days / month
~11% of days
Why this matters
- Expected days 3.3 days / month
- Probability ~11% of days
- Intensity Up to ~26mm (P95)
Heavy rain is possible on ~3 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Cloudy days Measures: Cloudy days (cloud cover >=60%). Observed about 78% of days (24.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
24.3 days / month
~78% of days
Why this matters
- Expected days 24.3 days / month
- Probability ~78% of days
- Intensity Up to ~100% (P95)
Cloudy skies are possible on ~24 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet days Measures: Wet days (>=0.1mm). Observed about 66% of days (20.5 days/month) in August. Historical risk signal only, not a day-by-day forecast.
20.5 days / month
~66% of days
Why this matters
- Expected days 20.5 days / month
- Probability ~66% of days
- Intensity Up to ~18mm (P95)
Measurable rain is possible on ~21 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Humidity Minor
High humidity Measures: High humidity days (RH >=80%). Observed about 66% of days (20.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
20.3 days / month
~66% of days
Why this matters
- Expected days 20.3 days / month
- Probability ~66% of days
- Intensity Up to ~95% (P95)
High humidity is possible on ~20 days. Comfort and pace can drop quickly, so plan shorter outdoor blocks with air-conditioned backup stops.
Rain Minor
Rainy hours Measures: Rain-hours signal (>=3h rain). Observed about 59% of days (18.2 days/month) in August. Historical risk signal only, not a day-by-day forecast.
18.2 days / month
~59% of days
Why this matters
- Expected days 18.2 days / month
- Probability ~59% of days
- Intensity Up to ~23h (P95)
Several rainy hours are possible on ~18 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Cloud Minor
Mostly cloudy days Measures: Mostly cloudy days (cloud cover >=80%). Observed about 57% of days (17.6 days/month) in August. Historical risk signal only, not a day-by-day forecast.
17.6 days / month
~57% of days
Why this matters
- Expected days 17.6 days / month
- Probability ~57% of days
- Intensity Up to ~100% (P95)
Mostly cloudy skies are possible on ~18 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Rain Minor
Wet most of day Measures: Wet-most-of-day signal (>=6h rain). Observed about 48% of days (14.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
14.8 days / month
~48% of days
Why this matters
- Expected days 14.8 days / month
- Probability ~48% of days
- Intensity Up to ~23h (P95)
Wet-most-of-day conditions are possible on ~15 days. Outdoor plans can become unreliable, so keep an indoor backup and flexibility around start times.
Wind Minor
Gusty days Measures: Gusty days (>=40 km/h). Observed about 46% of days (14.3 days/month) in August. Historical risk signal only, not a day-by-day forecast.
14.3 days / month
~46% of days
Why this matters
- Expected days 14.3 days / month
- Probability ~46% of days
- Intensity Up to ~74km/h (P95)
Gusty conditions are possible on ~14 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cloud Minor
Overcast days Measures: Overcast days (cloud cover >=95%). Observed about 32% of days (9.8 days/month) in August. Historical risk signal only, not a day-by-day forecast.
9.8 days / month
~32% of days
Why this matters
- Expected days 9.8 days / month
- Probability ~32% of days
- Intensity Up to ~100% (P95)
Overcast skies are possible on ~10 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Other Minor
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data Measures: Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data. Observed about 13% of days (4.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
4.0 days / month
~13% of days
Why this matters
- Expected days 4.0 days / month
- Probability ~13% of days
- Intensity Up to ~97 (P95)
Low visibility proxy: same as fog-likely (RH ≥90% AND cloud ≥95%) — true visibility requires hourly visibility data is possible on ~4 days. Fixed-time outdoor plans are safer with a backup option and flexible timing.
Cold Minor
Cold nights Measures: Cold nights (min <=5C). Observed about 6% of days (1.7 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.7 days / month
~6% of days
Why this matters
- Expected days 1.7 days / month
- Probability ~6% of days
- Intensity Up to ~5°C (P95)
Cold nights are possible on ~2 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Wind Minor
Breezy days Measures: Breezy days (mean wind >=25 km/h). Observed about 3% of days (1.0 days/month) in August. Historical risk signal only, not a day-by-day forecast.
1.0 days / month
~3% of days
Why this matters
- Expected days 1.0 days / month
- Probability ~3% of days
- Intensity Up to ~33km/h (P95)
Breezy conditions are possible on ~1 days. Exposed activities and transport links are more likely to be disrupted, so keep sheltered alternatives ready.
Cold Minor
Cold days Measures: Cold days (max <=10C). Observed about 3% of days (0.9 days/month) in August. Historical risk signal only, not a day-by-day forecast.
0.9 days / month
~3% of days
Why this matters
- Expected days 0.9 days / month
- Probability ~3% of days
- Intensity Up to ~10°C (P95)
Cold daytime conditions are possible on ~1 days. Long outdoor blocks become harder to sustain, so layer up and keep a warm indoor fallback nearby.
Frequently asked questions
Is August a good time to visit Reykjavik?
Typical August days in Reykjavik reach highs of 13°C (55°F) with nights around 8°C (46°F). It usually feels cool by day and cool after dark. Overall, August sits in the middle of the Reykjavik climate range.
What are temperatures like in August?
In August, you can usually expect highs of 13°C (55°F) and lows near 8°C (46°F). That means cool days and cool nights, so pack layers you can add or remove.
How much does it rain in August?
Rainfall in August averages 105 mm (4.1 in) across roughly 18 days. Overall it is a very wet time of year, so a light rain jacket and waterproof shoes are very handy.
How many hours of daylight are there in August?
You can expect about 16 hours of daylight in August. Sunrise is typically around 05:22 and sunset near 21:40. Very long days give you plenty of daylight for exploring.
How strong is the sun in August?
UV levels are moderate (around 5); sunscreen and sunglasses are still a good idea.
Is it windy in August?
In August, average wind speeds are around 13 km/h (8 mph), with gusts on the windiest days reaching about 60 km/h (37 mph). On the ground, it is it is a notably windy place, and strong gusts are fairly common.